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    BibTeX-Key Author Title Year Journal / Proceedings / Book Publication type Link
    Martini-2020a Martini, A. and Bonelli, G.P. and Rivola, A. Virtual testing of counterbalance forklift trucks: Implementation and experimental validation of a numerical multibody model 2020 Machines
    Vol.8 (2) Published on line: 14 May 2020; Scopus: 2-s2.0-85085882093; WOS: 000551246200009  
    article PDF
    Abstract: This study investigates the dynamic behavior of a recently developed counterbalance forklift truck. The final objective is creating virtual testing tools based on numerical multibody models to evaluate the dynamic stresses experienced by the forklift family of interest during a reference operating cycle, defined by the manufacturer's testing protocols. This work aims at defining sufficiently accurate and easy-to-implement modelling approaches and validation procedures. It focuses on a specific test, namely the passage of a speed-bump-like obstacle at high velocity, which represents one of the most severe conditions within the reference cycle. Indeed, unlike most of the other wheeled vehicles, forklifts typically do not have advanced suspension systems and their dynamic response is significantly affected by ground irregularities. To this end, a preliminary model of the complete forklift, featuring rigid bodies and a simplified tire-ground contact model, is implemented with a commercial software. Experimental tests are conducted on the forklift to measure the vehicle vibrations when running on the obstacle, for model validation purposes. After model updating, the results provided by the numerical simulations match the experimental data satisfactorily. Hence, the modelling and validation strategies are proven viable and effective. 2020 by the authors.
    BibTeX:
    					@article{Martini-2020a,
    					  author = {Martini, A. and Bonelli, G.P. and Rivola, A.},
    					  title = {Virtual testing of counterbalance forklift trucks: Implementation and experimental validation of a numerical multibody model},
    					  journal = {Machines},
    					  publisher = {MDPI AG},
    					  year = {2020},
    					  volume = {8},
    					  number = {2},
    					  note = {Published on line: 14 May 2020; Scopus: 2-s2.0-85085882093; WOS: 000551246200009},
    					  url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85085882093&doi=10.3390%2fMACHINES8020026&partnerID=40&md5=a8bf5d1331f0236ef27ece59ad37dc3e},
    					  doi = {https://doi.org/10.3390/MACHINES8020026}
    					}
    					
    Steinwolf-2020a Steinwolf, A. and Cornelis, B. and Peeters, B. and Van Der Auweraer, H. and Rivola, A. and Troncossi, M. On the use of kurtosis control methods in shaker testing for fatigue damage 2020 Journal of Testing and Evaluation
    Vol.48 (1) pp.1-19 Published on line: 5 June 2019; Scopus: 2-s2.0-85066813258; WOS: 000527603100039  
    article PDF
    Abstract: Random vibration testing with increased kurtosis introduces high peaks
    into shaker drive signals to simulate land vehicle vibration more
    accurately and also to shorten the required test time. Two methods
    of controlling kurtosis by phase manipulation in the inverse fast
    Fourier transform were implemented, tested, and compared. The first
    method generates high-kurtosis excitations with a gradual, smooth
    pattern of peak heights from low to high, and the second method produces
    isolated high peaks with intervals of stable background vibration
    between them. When applying a kurtosis increase for accelerated fatigue
    damage testing, the kurtosis control method must be able to pass
    high-kurtosis values from the generated shaker table vibration into
    the stress response of the unit under test. However, this is not
    always the case, and only one of the considered methods was capable
    of doing so. In the article, the fatigue damage spectrum model was
    used for an evaluation of the time to failure. An experimental study
    was carried out using operational vibration measured in a car. Shaker
    testing of cantilever specimens was performed for Gaussian, non-Gaussian,
    and accelerated non-Gaussian excitations. © 2020 ASTM International.
    All rights reserved.
    BibTeX:
    					@article{Steinwolf-2020a,
    					  author = {Steinwolf, A. and Cornelis, B. and Peeters, B. and Van Der Auweraer, H. and Rivola, A. and Troncossi, M.},
    					  title = {On the use of kurtosis control methods in shaker testing for fatigue damage},
    					  journal = {Journal of Testing and Evaluation},
    					  publisher = {ASTM International},
    					  year = {2020},
    					  volume = {48},
    					  number = {1},
    					  pages = {1-19},
    					  note = {Published on line: 5 June 2019; Scopus: 2-s2.0-85066813258; WOS: 000527603100039},
    					  url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85066813258&doi=10.1520%2fJTE20180149&partnerID=40&md5=ec51988c0ae8bfb271d19c7fd5389a42},
    					  doi = {https://doi.org/10.1520/JTE20180149}
    					}
    					
    Martini-2019a Martini, A. and Troncossi, M. and Rivola, A. Algorithm for the static balancing of serial and parallel mechanisms combining counterweights and springs: Generation, assessment and ranking of effective design variants 2019 Mechanism and Machine Theory
    Vol.137 pp.336 - 354 Published on line: 27 March 2019; Scopus: 2-s2.0-85063333373; WOS: 000463885300019  
    article PDF
    Abstract: Static balancing through passive devices is a suitable strategy to
    reduce motor loads for numerous applications in the automation and
    robotics fields. Many known methods require initially defining which
    balancing elements to install, thus possibly limiting the compensation
    effectiveness, since potentially optimal solutions may be neglected.
    This work presents an approach to statically balance linkages characterized
    by open and/or closed kinematic chains. The proposed algorithm searches
    for possible balanced variants of the mechanism that can be arranged
    by installing combinations of counterweights and springs, without
    auxiliary linkages. If solutions are found, the corresponding balancing
    parameters are tuned for optimizing the mechanism energy consumption,
    by considering the mechanism dynamics when performing its operational
    tasks. Actual benefits and drawbacks of the variants are assessed
    through quantitative criteria. The corresponding performance indicators
    are proposed as a guideline for designers to identify the most convenient
    balancing solutions. The implemented procedure is general and suitable
    to study any mechanism admitting closed-form solutions for its forward
    kinematics. A case study concerning an industrial palletizing robot
    is reported as an example of application. Overload issues affecting
    the robot actuators are solved through gravity compensation. The
    results achieved for the industrial problem prove the procedure effectiveness.
    BibTeX:
    					@article{Martini-2019a,
    					  author = {Alberto Martini and Marco Troncossi and Alessandro Rivola},
    					  title = {Algorithm for the static balancing of serial and parallel mechanisms combining counterweights and springs: Generation, assessment and ranking of effective design variants},
    					  journal = {Mechanism and Machine Theory},
    					  year = {2019},
    					  volume = {137},
    					  pages = {336 - 354},
    					  note = {Published on line: 27 March 2019; Scopus: 2-s2.0-85063333373; WOS: 000463885300019},
    					  url = {http://www.sciencedirect.com/science/article/pii/S0094114X18320548},
    					  doi = {https://doi.org/10.1016/j.mechmachtheory.2019.03.031}
    					}
    					
    Rivola-2019a Rivola, A. and Golfari, N. Triangoli e quadrilateri pieghevoli 2019 Dodicesima Giornata di Studio Ettore Funaioli -- 20 luglio 2018
    pp.61--62  
    incollection PDF
    BibTeX:
    					@incollection{Rivola-2019a,
    					  author = {Rivola, A. and Golfari, N.},
    					  title = {Triangoli e quadrilateri pieghevoli},
    					  booktitle = {Dodicesima Giornata di Studio Ettore Funaioli -- 20 luglio 2018},
    					  publisher = {Società Editrice Esculapio},
    					  year = {2019},
    					  pages = {61--62},
    					  url = {http://amsacta.unibo.it/id/eprint/6183},
    					  doi = {https://doi.org/10.6092/unibo/amsacta/6183}
    					}
    					
    Troncossi-2019a Troncossi, M. and Martini, A. and Vincenzi, N. and Rivola, A. Numerical and experimental analyses to enhance the vibration response of rotary transfer machines 2019 Proceedings of Survishno 2019, July 8-10, 2019, Lyon, France
    pp.1 Scopus: 2-s2.0-xxxxxxxxxx; WOS: xxxxxxxxxxxxxxx  
    conference
    BibTeX:
    					@conference{Troncossi-2019a,
    					  author = {Troncossi, M. and Martini, A. and Vincenzi, N. and Rivola, A.},
    					  title = {Numerical and experimental analyses to enhance the vibration response of rotary transfer machines},
    					  booktitle = {Proceedings of Survishno 2019, July 8-10, 2019, Lyon, France},
    					  year = {2019},
    					  pages = {1},
    					  note = {Scopus: 2-s2.0-xxxxxxxxxx; WOS: xxxxxxxxxxxxxxx}
    					}
    					
    Martini-2018a Martini, A. and Rivola, A. and Troncossi, M. Autocorrelation Analysis of Vibro-Acoustic Signals Measured in a Test Field for Water Leak Detection 2018 Applied Sciences
    Vol.8 (12) pp.1-15 Published on line: 1 December 2018; Scopus: 2-s2.0-85057873059; WOS: 000455145000118  
    article PDF
    Abstract: Reducing losses in water distribution networks is a worldwide challenge
    and all utilities are developing proper strategies for the active
    control of leaks. Temporary or permanent grids of units for the continuous
    monitoring of pipelines through vibro-acoustic measurements are probably
    the most commonly adopted leak detection systems. Such systems generally
    rely on the definition of proper thresholds to detect increments
    in the vibration levels associated with leaks. Since the thresholds
    are strongly dependent on the local boundary conditions of the monitored
    network, the initial setup is costly and time consuming, and the
    risk of undetected leaks or false alarms increases. This work aims
    to investigate leak detection methods based on the inherent properties
    of the measured signals instead of their relative amplitude. In particular,
    the possibility of detecting water leaks in small-diameter plastic
    pipes by analyzing the autocorrelation function of vibro-acoustic
    signals is assessed. An experimental campaign is conducted in a full-scale
    test facility that simulates the actual network. The measurements
    concerning artificially generated leaks are attained by two accelerometers
    and one hydrophone. The experimental results confirm the effectiveness
    of the proposed approach, which is therefore proven as a promising
    tool for leak detection.
    BibTeX:
    					@article{Martini-2018a,
    					  author = {Martini, Alberto and Rivola, Alessandro and Troncossi, Marco},
    					  title = {Autocorrelation Analysis of Vibro-Acoustic Signals Measured in a Test Field for Water Leak Detection},
    					  journal = {Applied Sciences},
    					  publisher = {MDPI AG},
    					  year = {2018},
    					  volume = {8},
    					  number = {12},
    					  pages = {1-15},
    					  note = {Published on line: 1 December 2018; Scopus: 2-s2.0-85057873059; WOS: 000455145000118},
    					  url = {http://www.mdpi.com/2076-3417/8/12/2450},
    					  doi = {https://doi.org/10.3390/app8122450}
    					}
    					
    Rivola-2018a Rivola, A. Caso limite di Grashof del quadrilatero articolato piano e terne pitagoriche 2018 Undicesima Giornata di Studio Ettore Funaioli -- 21 luglio 2017
    pp.53--60  
    incollection PDF
    BibTeX:
    					@incollection{Rivola-2018a,
    					  author = {Rivola, A.},
    					  title = {Caso limite di Grashof del quadrilatero articolato piano e terne pitagoriche},
    					  booktitle = {Undicesima Giornata di Studio Ettore Funaioli -- 21 luglio 2017},
    					  publisher = {Società Editrice Esculapio},
    					  year = {2018},
    					  pages = {53--60},
    					  url = {http://amsacta.unibo.it/id/eprint/5963},
    					  doi = {https://doi.org/10.6092/unibo/amsacta/5963}
    					}
    					
    Cocconcelli-2017a Cocconcelli, M. and Troncossi, M. and Mucchi, E. and Agazzi, A. and Rivola, A. and Rubini, R. and Dalpiaz, G. Numerical and Experimental Dynamic Analysis of IC Engine Test Beds Equipped with Highly Flexible Couplings 2017 Shock and Vibration
    Vol.2017 pp.1--16 Published on line: 9 July 2017; Scopus: 2-s2.0-85026535707; WOS: 000406212400001  
    article PDF
    Abstract: Driveline components connected to internal combustion engines can
    be critically loaded by dynamic forces due to motion irregularity.
    In particular, flexible couplings used in engine test rig are usually
    subjected to high levels of torsional oscillations and time-varying
    torque. This could lead to premature failure of the test rig. In
    this work an effective methodology for the estimation of the dynamic
    behavior of highly flexible couplings in real operational conditions
    is presented in order to prevent unwanted halts. The methodology
    addresses a combination of numerical models and experimental measurements.
    In particular, two mathematical models of the engine test rig were
    developed: a torsional lumped-parameter model for the estimation
    of the torsional dynamic behavior in operative conditions and a finite
    element model for the estimation of the natural frequencies of the
    coupling. The experimental campaign addressed torsional vibration
    measurements in order to characterize the driveline dynamic behavior
    as well as validate the models. The measurements were achieved by
    a coder-based technique using optical sensors and zebra tapes. Eventually,
    the validated models were used to evaluate the effect of design modifications
    of the coupling elements in terms of natural frequencies (torsional
    and bending), torsional vibration amplitude, and power loss in the
    couplings.
    BibTeX:
    					@article{Cocconcelli-2017a,
    					  author = {Cocconcelli, M. and Troncossi, M. and Mucchi, E. and Agazzi, A. and Rivola, A. and Rubini, R. and Dalpiaz, G.},
    					  title = {Numerical and Experimental Dynamic Analysis of IC Engine Test Beds Equipped with Highly Flexible Couplings},
    					  journal = {Shock and Vibration},
    					  publisher = {Hindawi Limited},
    					  year = {2017},
    					  volume = {2017},
    					  pages = {1--16},
    					  note = {Published on line: 9 July 2017; Scopus: 2-s2.0-85026535707; WOS: 000406212400001},
    					  url = {https://doi.org/10.1155/2017/5802702},
    					  doi = {https://doi.org/10.1155/2017/5802702}
    					}
    					
    Martini-2017a Martini, A. and Troncossi, M. and Rivola, A. Leak Detection in Water-Filled Small-Diameter Polyethylene Pipes by Means of Acoustic Emission Measurements 2017 Applied Sciences
    Vol.7 (1) pp.1-13 Published on line: 22 December 2016; Scopus: 2-s2.0-85011017790; WOS: 000395485900002  
    article PDF
    Abstract: The implementation of effective strategies to manage leaks represents
    an essential goal for all utilities involved with drinking water
    supply in order to reduce water losses affecting urban distribution
    networks. This study concerns the early detection of leaks occurring
    in small-diameter customers' connections to water supply networks.
    An experimental campaign was carried out in a test bed to investigate
    the sensitivity of Acoustic Emission (AE) monitoring to water leaks.
    Damages were artificially induced on a polyethylene pipe (length
    28 m, outer diameter 32 mm) at different distances from an AE transducer.
    Measurements were performed in both unburied and buried pipe conditions.
    The analysis permitted the identification of a clear correlation
    between three monitored parameters (namely total Hits, Cumulative
    Counts and Cumulative Amplitude) and the characteristics of the examined
    leaks.
    BibTeX:
    					@article{Martini-2017a,
    					  author = {Martini, A. and Troncossi, M. and Rivola, A.},
    					  title = {Leak Detection in Water-Filled Small-Diameter Polyethylene Pipes by Means of Acoustic Emission Measurements},
    					  journal = {Applied Sciences},
    					  publisher = {MDPI AG},
    					  year = {2017},
    					  volume = {7},
    					  number = {1},
    					  pages = {1-13},
    					  note = {Published on line: 22 December 2016; Scopus: 2-s2.0-85011017790; WOS: 000395485900002},
    					  url = {http://www.mdpi.com/2076-3417/7/1/2},
    					  doi = {https://doi.org/10.3390/app7010002}
    					}
    					
    Martini-2017b Martini, A. and Troncossi, M. and Rivola, A. and Vincenzi, N. Experimental vibration analysis of a rotary transfer machine for the manufacture of lock components 2017 9th International Conference on Acoustical and Vibratory Surveillance Methods and Diagnostic Techniques (Surveillance 9), 22-24 May 2017, Fez, Marocco
    pp.1-9 Scopus: 2-s2.0-xxxxxxxxxxxxxx; WOS: xxxxxxxxxxxxxx  
    conference
    BibTeX:
    					@conference{Martini-2017b,
    					  author = {Martini, A. and Troncossi, M. and Rivola, A. and Vincenzi, N.},
    					  title = {Experimental vibration analysis of a rotary transfer machine for the manufacture of lock components},
    					  booktitle = {9th International Conference on Acoustical and Vibratory Surveillance Methods and Diagnostic Techniques (Surveillance 9), 22-24 May 2017, Fez, Marocco},
    					  year = {2017},
    					  pages = {1-9},
    					  note = {Scopus: 2-s2.0-xxxxxxxxxxxxxx; WOS: xxxxxxxxxxxxxx}
    					}
    					
    Martini-2017c Martini, A. and Troncossi, M. and Rivola, A. Vibroacoustic Measurements for Detecting Water Leaks in Buried Small-Diameter Plastic Pipes 2017 Journal of Pipeline Systems Engineering and Practice
    Vol.8 (4) pp.04017022 Published on line: 31 July 2017; Scopus: 2-s2.0-85026737172; WOS: 000417600200021  
    article PDF
    Abstract: Leak detection is an essential topic within the policies of water
    loss management in drinking-water supply networks. This paper reports
    the results of an experimental campaign performed for assessing the
    sensitivity to water leaks of measurements of different vibroacoustic
    phenomena. The study represents the first stage of research aimed
    at developing a device for automatic leak detection in service pipes
    of water distribution networks. Leaks were artificially induced on
    a plastic pipe (length of 28 m and diameter of 32 mm) of a buried
    experimental facility. Vibroacoustic phenomena related to the leaking
    flow were monitored using a hydrophone and two accelerometers. A
    satisfactory leak-detection performance was achieved by processing
    the signals from both kinds of transducers.
    BibTeX:
    					@article{Martini-2017c,
    					  author = {Martini, A. and Troncossi, M. and Rivola, A.},
    					  title = {Vibroacoustic Measurements for Detecting Water Leaks in Buried Small-Diameter Plastic Pipes},
    					  journal = {Journal of Pipeline Systems Engineering and Practice},
    					  year = {2017},
    					  volume = {8},
    					  number = {4},
    					  pages = {04017022},
    					  note = {Published on line: 31 July 2017; Scopus: 2-s2.0-85026737172; WOS: 000417600200021},
    					  url = {http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29PS.1949-1204.0000287},
    					  doi = {https://doi.org/10.1061/(ASCE)PS.1949-1204.0000287}
    					}
    					
    Troncossi-2017a Troncossi, M. and Rivola, A. Experimental HALTs with sine-on-random synthesized profiles 2017 Vibroengineering PROCEDIA 25th International Conference on Vibroengineering, 30 May-1 June, 2017, Liberec, Czech Republic (Conference Code: 128743)
    Vol.11 pp.34--39 Scopus: 2-s2.0-85025825305; WOS: xxxxxxxxxx  
    conference PDF
    Abstract: In several applications, certain components must be designed to withstand
    the fatigue damage induced by dynamic loads due to vibrations. Highly
    Accelerated Life Tests (HALTs) by means of vibration qualification
    can be performed for the most critical ones. The proper synthesis
    of test profiles, which starts from the real environment vibrations
    and which preserves both the fatigue damage potential and the signal
    characteristics of the excitation, is important to obtain reliable
    results. A special kind of vibration excitation is the so-called
    Sine-on-Random (SoR), i.e. sinusoidal contributions superimposed
    to random vibrations, particularly significant for systems where
    rotating parts are present. A methodology was previously proposed
    to synthesize SoR test profiles for HALTs, starting from reference
    measured vibrations. The present paper illustrates the experimental
    campaign carried out to verify the effectiveness and the accuracy
    of the proposed method.
    BibTeX:
    					@conference{Troncossi-2017a,
    					  author = {Troncossi, M. and Rivola, A.},
    					  title = {Experimental HALTs with sine-on-random synthesized profiles},
    					  booktitle = {25th International Conference on Vibroengineering, 30 May-1 June, 2017, Liberec, Czech Republic (Conference Code: 128743)},
    					  journal = {Vibroengineering PROCEDIA},
    					  publisher = {JVE International},
    					  year = {2017},
    					  volume = {11},
    					  pages = {34--39},
    					  note = {Scopus: 2-s2.0-85025825305; WOS: xxxxxxxxxx},
    					  url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85025825305&doi=10.21595%2fvp.2017.18595&partnerID=40&md5=ce7ca789c17664d0b01ee59871829408},
    					  doi = {https://doi.org/10.21595/vp.2017.18595}
    					}
    					
    Carrabotta-2016a Carrabotta, R. and Martini, A. and Troncossi, M. and Rivola, A. Optimized Gravity Compensation Solutions for the ANTROP Palletizing Manipulator 2016 Nona Giornata di Studio Ettore Funaioli -- 17 Luglio 2015
    pp.99-104  
    incollection PDF
    BibTeX:
    					@incollection{Carrabotta-2016a,
    					  author = {Carrabotta, R. and Martini, A. and Troncossi, M. and Rivola, A.},
    					  title = {Optimized Gravity Compensation Solutions for the ANTROP Palletizing Manipulator},
    					  booktitle = {Nona Giornata di Studio Ettore Funaioli -- 17 Luglio 2015},
    					  publisher = {Società Editrice Esculapio},
    					  year = {2016},
    					  pages = {99-104},
    					  url = {http://amsacta.unibo.it/5237/},
    					  doi = {https://doi.org/10.6092/unibo/amsacta/5237}
    					}
    					
    Martini-2016a Martini, A. and Troncossi, M. and Rivola, A. Investigation on the Detection of Water Leaks in Small-Diameter Polyethylene Pipes Using Acoustic Emission Signals 2016 Proceedings of the 8th International Conference on Urban REhabilitation and Sustainability (URES'16), 21-23 October, 2016, Rome (Italy)
    pp.1-6 Scopus: 2-s2.0-xxxxxxxx; WOS: xxxxxxxxxx  
    conference
    Abstract: Active control of water losses is an essential strategy to increase
    the efficiency of urban water supply systems. This work deals with
    the early detection of leaks occurring in small-diameter service
    pipes of water distribution networks. Preliminary experiments were
    conducted in a test facility to assess the sensitivity of Acoustic
    Emission methods to leaking water flows. Acoustic Emission measurements
    were performed on an unburied polyethylene pipe with artificially
    generated leaks. A good correlation between several monitored parameters
    and the characteristics of the examined leaks could be identified.
    BibTeX:
    					@conference{Martini-2016a,
    					  author = {Martini, A. and Troncossi, M. and Rivola, A.},
    					  title = {Investigation on the Detection of Water Leaks in Small-Diameter Polyethylene Pipes Using Acoustic Emission Signals},
    					  booktitle = {Proceedings of the 8th International Conference on Urban REhabilitation and Sustainability (URES'16), 21-23 October, 2016, Rome (Italy)},
    					  year = {2016},
    					  pages = {1-6},
    					  note = {Scopus: 2-s2.0-xxxxxxxx; WOS: xxxxxxxxxx}
    					}
    					
    Martini-2016b Martini, A. and Troncossi, M. and Rivola, A. Investigation on the Detection of Water Leaks in Small-Diameter Polyethylene Pipes Using Acoustic Emission Signals 2016 WSEAS Transactions on Fluid Mechanics
    Vol.11 pp.106-111 article no. 13, Scopus: 2-s2.0-xxxxxxxx; WOS: xxxxxxxxxx  
    article
    Abstract: Active control of water losses is an essential strategy to increase
    the efficiency of urban water supply systems. This work deals with
    the early detection of leaks occurring in small-diameter service
    pipes of water distribution networks. Preliminary experiments were
    conducted in a test facility to assess the sensitivity of Acoustic
    Emission methods to leaking water flows. Acoustic Emission measurements
    were performed on an unburied polyethylene pipe with artificially
    generated leaks. A good correlation between several monitored parameters
    and the characteristics of the examined leaks could be identified.
    BibTeX:
    					@article{Martini-2016b,
    					  author = {Martini, A. and Troncossi, M. and Rivola, A.},
    					  title = {Investigation on the Detection of Water Leaks in Small-Diameter Polyethylene Pipes Using Acoustic Emission Signals},
    					  journal = {WSEAS Transactions on Fluid Mechanics},
    					  year = {2016},
    					  volume = {11},
    					  pages = {106-111},
    					  note = {article no. 13, Scopus: 2-s2.0-xxxxxxxx; WOS: xxxxxxxxxx}
    					}
    					
    Troncossi-2016a Troncossi, M. and Di Sante, R. and Rivola, A. Response measurement by laser Doppler vibrometry in vibration qualification tests with non-Gaussian random excitation 2016 Review of Scientific Instruments
    Vol.87 (10) pp.1-9 Published on line: 12 October 2016; Scopus: 2-s2.0-84991709429; WOS: 000387661900003  
    article PDF
    Abstract: In the field of vibration qualification testing, random excitations
    are typically imposed on the tested system in terms of a power spectral
    density (PSD) profile. This is the one of the most popular ways to
    control the shaker or slip table for durability tests. However, these
    excitations (and the corresponding system responses) exhibit a Gaussian
    probability distribution, whereas not all real-life excitations are
    Gaussian, causing the response to be also non-Gaussian. In order
    to introduce non-Gaussian peaks, a further parameter, i.e., kurtosis,
    has to be controlled in addition to the PSD. However, depending on
    the specimen behaviour and input signal characteristics, the use
    of non-Gaussian excitations with high kurtosis and a given PSD does
    not automatically imply a non-Gaussian stress response. For an experimental
    investigation of these coupled features, suitable measurement methods
    need to be developed in order to estimate the stress amplitude response
    at critical failure locations and consequently evaluate the input
    signals most representative for real-life, non-Gaussian excitations.
    In this paper, a simple test rig with a notched cantilevered specimen
    was developed to measure the response and examine the kurtosis values
    in the case of stationary Gaussian, stationary non-Gaussian, and
    burst non-Gaussian excitation signals. The laser Doppler vibrometry
    technique was used in this type of test for the first time, in order
    to estimate the specimen stress amplitude response as proportional
    to the differential displacement measured at the notch section ends.
    A method based on the use of measurements using accelerometers to
    correct for the occasional signal dropouts occurring during the experiment
    is described. The results demonstrate the ability of the test procedure
    to evaluate the output signal features and therefore to select the
    most appropriate input signal for the fatigue test. Published by
    AIP Publishing.
    BibTeX:
    					@article{Troncossi-2016a,
    					  author = {Troncossi, M. and Di Sante, R. and Rivola, A.},
    					  title = {Response measurement by laser Doppler vibrometry in vibration qualification tests with non-Gaussian random excitation},
    					  journal = {Review of Scientific Instruments},
    					  publisher = {American Institute of Physics Inc.},
    					  year = {2016},
    					  volume = {87},
    					  number = {10},
    					  pages = {1-9},
    					  note = {Published on line: 12 October 2016; Scopus: 2-s2.0-84991709429; WOS: 000387661900003},
    					  url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84991709429&partnerID=40&md5=9b85aaab81bcd493bb524933ea33d580},
    					  doi = {https://doi.org/10.1063/1.4964477}
    					}
    					
    Carrabotta-2015a Carrabotta, R. and Martini, A. and Troncossi, M. and Rivola, A. Optimal static balancing of a spatial palletizing robot 2015 Proceedings of ECCOMAS Thematic Conference on Multibody Dynamics, June 29-July 2, 2015, Barcelona, Spain
    pp.817-827 Scopus: 2-s2.0-84979537052; WOS: xxxxxxxxxxxxxx  
    conference
    Abstract: Static balancing is often used in industrial applications in order
    to reduce the actuator efforts required during the machine operations.
    Literature offers a number of methods to study static balancing and
    to define positions and features of the balancing devices that are
    commonly used to achieve gravity compensation, i.e. counterweights,
    springs, hydro/pneumatic cylinders, and/or auxiliary parallelograms.
    This work deals with the static balancing of a commercial spatial
    manipulator, primarily conceived for palletizing tasks with a maximum
    payload of 150 kg. Since the robot has a hybrid architecture that
    includes closed kinematic chains, common balancing methods for serial
    manipulators are not suitable and new solutions must be developed.
    The paper proposes a number of different balancing solutions which
    include counterweights and springs, whose characteristics and positions
    are determined by means of an optimization algorithm. The effectiveness
    of each solution is investigated and the corresponding feasibility
    is discussed.
    BibTeX:
    					@conference{Carrabotta-2015a,
    					  author = {Carrabotta, R. and Martini, A. and Troncossi, M. and Rivola, A.},
    					  title = {Optimal static balancing of a spatial palletizing robot},
    					  booktitle = {Proceedings of ECCOMAS Thematic Conference on Multibody Dynamics, June 29-July 2, 2015, Barcelona, Spain},
    					  publisher = {International Center for Numerical Methods in Engineering},
    					  year = {2015},
    					  pages = {817-827},
    					  note = {Scopus: 2-s2.0-84979537052; WOS: xxxxxxxxxxxxxx}
    					}
    					
    Martini-2015a Martini, A. and Troncossi, M. and Carricato, M. and Rivola, A. Gravity compensation of the Orthoglide 5-axis Parallel Kinematics Machine 2015 Ottava Giornata di Studio Ettore Funaioli -- 18 Luglio 2014
    pp.67-73  
    incollection PDF
    BibTeX:
    					@incollection{Martini-2015a,
    					  author = {Martini, A. and Troncossi, M. and Carricato, M. and Rivola A.},
    					  title = {Gravity compensation of the Orthoglide 5-axis Parallel Kinematics Machine},
    					  booktitle = {Ottava Giornata di Studio Ettore Funaioli -- 18 Luglio 2014},
    					  publisher = {Società Editrice Esculapio},
    					  year = {2015},
    					  pages = {67-73},
    					  url = {http://amsacta.unibo.it/4301/},
    					  doi = {https://doi.org/10.6092/unibo/amsacta/4301}
    					}
    					
    Martini-2015b Martini, A. and Troncossi, M. and Rivola, A. Automatic Leak Detection in Buried Plastic Pipes of Water Supply Networks by Means of Vibration Measurements 2015 Shock and Vibration
    Vol.2015 pp.1-13 article no. 165304, Scopus: 2-s2.0-84937250311; WOS: 000349233100001  
    article PDF
    Abstract: The implementation of strategies for controlling water leaks is essential
    in order to reduce losses affecting distribution networks of drinking
    water. This paper focuses on leak detection by using vibration monitoring
    techniques. The long-term goal is the development of a system for
    automatic early detection of burst leaks in service pipes. An experimental
    campaign was started to measure vibrations transmitted along water
    pipes by real burst leaks occurring in actual water supply networks.
    The first experimental data were used for assessing the leak detection
    performance of a prototypal algorithm based on the calculation of
    the standard deviation of acceleration signals. The experimental
    campaign is here described and discussed. The proposed algorithm,
    enhanced by means of proper signal filtering techniques, was successfully
    tested on all monitored leaks, thus proving effective for leak detection
    purpose.
    BibTeX:
    					@article{Martini-2015b,
    					  author = {Martini, A. and Troncossi, M. and Rivola, A.},
    					  title = {Automatic Leak Detection in Buried Plastic Pipes of Water Supply Networks by Means of Vibration Measurements},
    					  journal = {Shock and Vibration},
    					  publisher = {Hindawi Publishing Corporation},
    					  year = {2015},
    					  volume = {2015},
    					  pages = {1-13},
    					  note = {article no. 165304, Scopus: 2-s2.0-84937250311; WOS: 000349233100001},
    					  url = {http://dx.doi.org/10.1155/2015/165304},
    					  doi = {https://doi.org/10.1155/2015/165304}
    					}
    					
    Martini-2015c Martini, A. and Troncossi, M. and Carricato, M. and Rivola, A. Static balancing of a parallel kinematics machine with Linear-Delta architecture: theory, design and numerical investigation 2015 Mechanism and Machine Theory
    Vol.90 (0) pp.128-141 Published on line: 31 March 2015; Scopus: 2-s2.0-84945749921; WOS: 000353985200009  
    article PDF
    Abstract: Abstract This study deals with the compensation of gravity loads in
    parallel kinematics machines as a possible strategy for enhancing
    their working performance. In particular, the paper focuses on the
    static balancing of the Orthoglide 5-axis, a prototypal parallel
    robot with Linear-Delta architecture for machining operation. Gravity
    compensation is analytically carried out and a feasible design, based
    on tension springs and a simple additional linkage, is presented
    to implement the proposed strategy. Simulation results prove that
    the balancing device may provide an appreciable enhancement of the
    mechanism energy efficiency.
    BibTeX:
    					@article{Martini-2015c,
    					  author = {Martini, A. and Troncossi, M. and Carricato, M. and Rivola, A.},
    					  title = {Static balancing of a parallel kinematics machine with Linear-Delta architecture: theory, design and numerical investigation},
    					  journal = {Mechanism and Machine Theory},
    					  publisher = {Elsevier Ltd},
    					  year = {2015},
    					  volume = {90},
    					  number = {0},
    					  pages = {128-141},
    					  note = {Published on line: 31 March 2015; Scopus: 2-s2.0-84945749921; WOS: 000353985200009},
    					  url = {http://www.sciencedirect.com/science/article/pii/S0094114X15000403},
    					  doi = {https://doi.org/10.1016/j.mechmachtheory.2015.03.003}
    					}
    					
    Martini-2015d Martini, A. and Troncossi, M. and Rivola, A. Experimental vibration analysis of an automatic machine for plastic cap assembly 2015 8th International Conference on Acoustical and Vibratory Surveillance Methods and Diagnostic Techniques (Surveillance 8), 20-21 October 2015, Roanne, France
    pp.1-8 Scopus: 2-s2.0-xxxxxxxxxxxxxx; WOS: xxxxxxxxxxxxxx  
    conference
    Abstract: The case study presented in this paper concerns vibration measurements
    performed on an industrial automatic machine for assembling plastic
    caps. The final purpose of the activity is increasing the machine
    working speed of 50% (and thus the productivity), by making only
    limited modifications to the current machine design. Since elastodynamic
    issues may occur for operation at higher working velocity, an experimental
    campaign was carried out for assessing the vibrations characterizing
    the machine functioning at different regimes. The investigation permitted
    to identify the functional groups exhibiting significant elastodynamic
    phenomena induced by the speed increment. The results concerning
    two of these groups, namely a unit for the orientation of the parts
    to be assembled and a power transmission chain, are presented and
    discussed.
    BibTeX:
    					@conference{Martini-2015d,
    					  author = {Martini, A. and Troncossi, M. and Rivola, A.},
    					  title = {Experimental vibration analysis of an automatic machine for plastic cap assembly},
    					  booktitle = {8th International Conference on Acoustical and Vibratory Surveillance Methods and Diagnostic Techniques (Surveillance 8), 20-21 October 2015, Roanne, France},
    					  year = {2015},
    					  pages = {1-8},
    					  note = {Scopus: 2-s2.0-xxxxxxxxxxxxxx; WOS: xxxxxxxxxxxxxx}
    					}
    					
    Troncossi-2015a Cocconcelli, M. and Troncossi, M. and Agazzi, A. and Mucchi, E. and Rubini, R. and Rivola, A. and Dalpiaz, G. Improvement of the Dynamic Behaviour of a Test Bed Driveline by Numerical and Experimental Investigations 2015 Ottava Giornata di Studio Ettore Funaioli -- 18 Luglio 2014
    pp.135-151  
    incollection PDF
    BibTeX:
    					@incollection{Troncossi-2015a,
    					  author = {Cocconcelli, M. and Troncossi, M. and Agazzi, A. and Mucchi, E. and Rubini, R. and Rivola, A. and Dalpiaz, G.},
    					  title = {Improvement of the Dynamic Behaviour of a Test Bed Driveline by Numerical and Experimental Investigations},
    					  booktitle = {Ottava Giornata di Studio Ettore Funaioli -- 18 Luglio 2014},
    					  publisher = {Società Editrice Esculapio},
    					  year = {2015},
    					  pages = {135-151},
    					  url = {http://amsacta.unibo.it/4301/},
    					  doi = {https://doi.org/10.6092/unibo/amsacta/4301}
    					}
    					
    Troncossi-2015b Cornelis, B. and Steinwolf, A. and Troncossi, M. and Rivola, A. Shaker testing simulation of non-Gaussian random excitations with the fatigue damage spectrum as a criterion of mission signal synthesis 2015 ICoEV 2015 -- International Conference on Engineering Vibration, 7-10 September 2015, Ljubljana, Slovenia
    Scopus: 2-s2.0-xxxxxxxxxxxxxx; WOS: xxxxxxxxxxxxxx  
    conference PDF
    Abstract: Experimental simulations of random excitations are nowadays performed
    digitally by applying the Inverse Fast Fourier Transform (IFFT) to
    the desired Power Spectral Density (PSD) profile, in combination
    with randomized IFFT phases. However, the excitations generated in
    this way will always have a Gaussian probability distribution, whereas
    real-life random excitations are typically non-Gaussian. For example,
    in the case of land transportation some distinctive peaks will occur
    which exceed the average level of vehicle vibration. The sta-tistical
    parameter known as kurtosis can characterize this feature and could
    be controlled in experimental simulations in addition to the PSD.
    The so-called ``kurtosis control'' can be achieved by special phase
    manipulation instead of selecting the phases randomly. By increasing
    the kurtosis, it is furthermore also possible to obtain an accelerated
    qualification test, whereby the time-to-failure (TTF) is decreased
    in a controlled manner. It is known that the response of a lightly-damped
    linear system is closer to Gaussian than the applied excitation.
    Therefore, in order to increase the response kurtosis in an accelerated
    test, the kurtosis control method must be able to effectively generate
    extra kurtosis. In this work a method was used which indeed achieves
    a high excitation kurtosis, which moreover passes into the re-sponse
    of the structure. According to the Fatigue Damage Spectrum (FDS)
    model, a single-degree-of-freedom system was hereby considered in
    order to calculate the structural response. Furthermore, the rainflow
    counting procedure and the Miner damage accumulation rule were employed
    to predict relative TTFs for operational excitation and accelerated
    test mission. Finally, the considered method of non-Gaussian shaker
    testing simulation was also advanced from kurtosis control to direct
    application of the FDS as a criterion for mission signal synthesis.
    An extensive experimental campaign was carried out, where an example
    of a real-life vibration excitation measured on the cabin floor of
    a car was considered. Shaker testing was performed for a cantilevered
    test specimen subjected to various simulated Gaussian, non-Gaussian,
    accelerated non-Gaussian, and real road excitations.
    BibTeX:
    					@conference{Troncossi-2015b,
    					  author = {Cornelis, B. and Steinwolf, A. and Troncossi, M. and Rivola, A.},
    					  title = {Shaker testing simulation of non-Gaussian random excitations with the fatigue damage spectrum as a criterion of mission signal synthesis},
    					  booktitle = {ICoEV 2015 -- International Conference on Engineering Vibration, 7-10 September 2015, Ljubljana, Slovenia},
    					  publisher = {University of Ljubljana, Faculty for Mechanical Engineering},
    					  year = {2015},
    					  note = {Scopus: 2-s2.0-xxxxxxxxxxxxxx; WOS: xxxxxxxxxxxxxx},
    					  url = {http://www.icoev.org}
    					}
    					
    Martini-2014a Martini, A. and Troncossi, M. and Rivola, A. and Nascetti, D. Preliminary investigations on automatic detection of leaks in water distribution networks by means of vibration monitoring 2014 Advances in Condition Monitoring of Machinery in Non-Stationary Operations
    pp.535-544 Scopus: 2-s2.0-84937219271; WOS: 000334677400046  
    incollection PDF
    Abstract: The efficiency of water supply networks is an important issue. In
    order to reduce water losses, policies of leak reduction are essential.
    The paper deals with a preliminary study on the use of vibration
    monitoring tools for the detection of leaks in water service pipelines.
    The long-term project is the development of a system for automatically
    detecting burst leaks occurring in service pipes. Prelimi-nary experimental
    tests were performed on both a test rig and an actual service pipe
    of the water distribution system. Three main objectives were achieved:
    first-ly, the effectiveness of vibration monitoring for leak detection
    purposes was as-sessed providing a positive response; then, a prototypal
    detection procedure was studied, implemented and tested on the preliminary
    experimental data; finally, the specifications for a prototypal acquisition
    equipment were also determined. This paper illustrates the experimental
    campaign and its main results.
    BibTeX:
    					@incollection{Martini-2014a,
    					  author = {Martini, A. and Troncossi, M. and Rivola, A. and Nascetti, D.},
    					  title = {Preliminary investigations on automatic detection of leaks in water distribution networks by means of vibration monitoring},
    					  booktitle = {Advances in Condition Monitoring of Machinery in Non-Stationary Operations},
    					  publisher = {SPRINGER-VERLAG BERLIN},
    					  year = {2014},
    					  pages = {535-544},
    					  note = {Scopus: 2-s2.0-84937219271; WOS: 000334677400046},
    					  url = {http://www.springer.com/engineering/mechanical+engineering/book/978-3-642-39347-1},
    					  doi = {https://doi.org/10.1007/978-3-642-39348-8_46}
    					}
    					
    Martini-2014b Martini, A. and Troncossi, M. and Carricato, M. and Rivola, A. Elastodynamic behaviour of balanced closed-loop mechanisms: numerical analysis of a four-bar linkage 2014 Meccanica
    Vol.49 (3) pp.601-614 Published on line: 22 October 2013; Scopus: 2-s2.0-84897024621; WOS: 000333078800007  
    article PDF
    Abstract: This paper investigates the influence of two common techniques of
    static balancing on the dynamic performance of closed-chain linkages,
    by taking into account the flexibility of the mechanism components.
    The long-term goal of the research consists in enhancing the operation
    of parallel spatial robots by means of optimal balancing strategies.
    This contribution is primarily meant to provide the analysis method
    of the research and, for this purpose, it focuses on the planar four-bar
    linkage, intended as the simplest example of closed-chain mechanism.
    An original approach for the static balancing of planar linkages
    by means of constant-force generators is firstly proposed. Then the
    operation of an unbalanced four-bar linkage and two balanced variants,
    obtained from the former by mass and elastic balancing respectively,
    is numerically studied. The natural frequencies and mode shapes of
    these mechanisms are estimated by modal analysis, whereas the dynamic
    performance at different operating regimes is assessed by kineto-elastodynamic
    investigation.
    BibTeX:
    					@article{Martini-2014b,
    					  author = {Martini, A. and Troncossi, M. and Carricato, M. and Rivola, A.},
    					  title = {Elastodynamic behaviour of balanced closed-loop mechanisms: numerical analysis of a four-bar linkage},
    					  journal = {Meccanica},
    					  publisher = {Springer Netherlands},
    					  year = {2014},
    					  volume = {49},
    					  number = {3},
    					  pages = {601-614},
    					  note = {Published on line: 22 October 2013; Scopus: 2-s2.0-84897024621; WOS: 000333078800007},
    					  url = {http://dx.doi.org/10.1007/s11012-013-9815-7},
    					  doi = {https://doi.org/10.1007/s11012-013-9815-7}
    					}
    					
    Martini-2014c Martini, A. and Troncossi, M. and Carricato, M. and Rivola, A. Statically Balanced Parallel Kinematics Machines: a Case Study 2014 INNOROBO 2014 - Workshop on Applications of Parallel and Cable-driven Robots, 18-20 March 2014, Lyon, France
    pp.1-2 Scopus: 2-s2.0-xxxxxxx; WOS: xxxxxxxxx  
    conference
    BibTeX:
    					@conference{Martini-2014c,
    					  author = {A. Martini and M. Troncossi and M. Carricato and A. Rivola},
    					  title = {Statically Balanced Parallel Kinematics Machines: a Case Study},
    					  booktitle = {INNOROBO 2014 - Workshop on Applications of Parallel and Cable-driven Robots, 18-20 March 2014, Lyon, France},
    					  year = {2014},
    					  pages = {1-2},
    					  note = {Scopus: 2-s2.0-xxxxxxx; WOS: xxxxxxxxx}
    					}
    					
    Martini-2014d Martini, A. and Troncossi, M. and Carricato, M. and Rivola, A. Static Balancing of a Parallel Kinematics Machine with Linear-Delta Architecture 2014 ASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis - ESDA2014, June 25-27 2014, Copenhagen, Denmark
    Vol.3: Engineering Systems; Heat Transfer and Thermal Engineering; Materials and Tribology; Mechatronics; Robotics. pp.1-8 Scopus: 2-s2.0-84916917523; WOS: 000361407000085  
    conference PDF
    Abstract: The study deals with the compensation of gravity loads in closed-loop
    mechanisms as a possible strategy for enhancing their working performance.
    This work focuses on the Orthoglide 5-axis, a prototypal parallel
    robot for milling operation, characterized by linear-delta architecture
    with two further serial DOFs. Starting from a general theory formerly
    proposed by the authors, gravity compensation of the mechanism is
    analytically carried out. The statically balanced Orthoglide 5-axis
    can be obtained by installing on one leg a proper set of extension
    springs and a simple additional linkage. A feasible design solution
    for developing the device in practice is presented. The proposed
    balancing device can be implemented with minor modifications of the
    original robot design, thus appearing a profitable solution to be
    possibly extended to other machinery with similar architecture. Copyright
    &circledc; 2014 by ASME.
    BibTeX:
    					@conference{Martini-2014d,
    					  author = {Martini, A. and Troncossi, M. and Carricato, M. and Rivola, A.},
    					  title = {Static Balancing of a Parallel Kinematics Machine with Linear-Delta Architecture},
    					  booktitle = {ASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis - ESDA2014, June 25-27 2014, Copenhagen, Denmark},
    					  publisher = {ASME},
    					  year = {2014},
    					  volume = {3: Engineering Systems; Heat Transfer and Thermal Engineering; Materials and Tribology; Mechatronics; Robotics.},
    					  pages = {1-8},
    					  note = {Scopus: 2-s2.0-84916917523; WOS: 000361407000085},
    					  url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84916917523&partnerID=40&md5=45d1f7f89ce003f756b8edb21575f3ff},
    					  doi = {https://doi.org/10.1115/ESDA2014-20449}
    					}
    					
    Martini-2014e Martini, A. and Troncossi, M. and Carricato, M. and Rivola, A. Multibody model and simulation of a statically balanced Parallel Kinematics Machine 2014 IMSD2014/ACMD 2014 - 3rd Joint International Conference on Multibody System Dynamics - 7th Asian Conference on Multibody Dynamics, June 30-July 3 2014, BEXCO, Busan, Korea
    pp.1-10 Scopus: 2-s2.0-xxxxxxx; WOS: xxxxxxxxx  
    conference
    Abstract: The study deals with the compensation of gravity loads in closed-loop
    mechanisms as a possible strategy for enhancing their working performance.
    This work focuses on the Orthoglide 5-axis, a prototypal parallel
    robot for milling operation characterized by linear-delta architecture,
    and its statically balanced variant, previously derived by the authors.
    The suitability of the adopted balancing approach is assessed by
    means of numerical simulations. Kinetostatic analyses are performed
    for evaluating the operation of both the unbalanced and the statically
    balanced mechanisms during the execution of reference trajectories
    and common machining tasks. Then, a sensitivity analysis is carried
    out to test the robustness of the proposed balancing solution when
    discrepancies between the actual and the nominal values of the balancing
    parameters occur. The results of simulations prove the effectiveness
    of the balancing solution and a significant enhancement of the mechanism
    energy efficiency provided by gravity compensation.
    BibTeX:
    					@conference{Martini-2014e,
    					  author = {Martini, A. and Troncossi, M. and Carricato, M. and Rivola, A.},
    					  title = {Multibody model and simulation of a statically balanced Parallel Kinematics Machine},
    					  booktitle = {IMSD2014/ACMD 2014 - 3rd Joint International Conference on Multibody System Dynamics - 7th Asian Conference on Multibody Dynamics, June 30-July 3 2014, BEXCO, Busan, Korea},
    					  year = {2014},
    					  pages = {1-10},
    					  note = {Scopus: 2-s2.0-xxxxxxx; WOS: xxxxxxxxx}
    					}
    					
    Mucchi-2014a Mucchi, E. and Rivola, A. and Dalpiaz, G. Modelling dynamic behaviour and noise generation in gear pumps: Procedure and validation 2014 Applied Acoustics
    Vol.77 pp.99-111 Published on line: 14 November 2013; Scopus: 2-s2.0-84888125826; WOS: 000329540200013  
    article PDF
    Abstract: The paper presents a methodology for noise and vibration analysis
    of gear pumps and its application to an external gear pump for automotive
    applications. The methodology addresses the use of a combined numerical
    model and experimental analyses. The combined model includes a lumped-parameter
    model, a finite-element model and a boundary-element model. The lumped-parameter
    (LP) model regards the interior parts of the pump (bearing blocks
    and gears loaded by the pressure distribution and the driving torque),
    the finite element (FE) model regards the external parts of the pump
    (casing and end plates), while the boundary element (BE) model enables
    the estimation of the emitted noise in operational conditions. Based
    on experimental evidences, attention has been devoted to the modelling
    of the pump lubricant oil: the fluid-structure interaction between
    the oil and pump casing was taken into account. In the case of gear
    pumps all these important effects have to be considered in the same
    model in order to take their interactions into account. The model
    has been assessed using experiments: the experimental accelerations
    and acoustic pressure measured in operational conditions have been
    compared with the simulated data coming from the combined LP/FE/BE
    model. The combined model can be considered a very useful tool for
    design optimisation. Â&circledc; 2013 Elsevier Ltd. All rights
    reserved.
    BibTeX:
    					@article{Mucchi-2014a,
    					  author = {Mucchi, E. and Rivola, A. and Dalpiaz, G.},
    					  title = {Modelling dynamic behaviour and noise generation in gear pumps: Procedure and validation},
    					  journal = {Applied Acoustics},
    					  year = {2014},
    					  volume = {77},
    					  pages = {99-111},
    					  note = {Published on line: 14 November 2013; Scopus: 2-s2.0-84888125826; WOS: 000329540200013},
    					  url = {http://www.sciencedirect.com/science/article/pii/S0003682X13002491},
    					  doi = {https://doi.org/10.1016/j.apacoust.2013.10.007}
    					}
    					
    Ricci-2014a Ricci, S. and Troncossi, M. and Rivola, A. Modal Selection Through Effective Interface Mass With Application to Flexible Multibody Cranktrain Dynamics 2014 Journal of Computational and Nonlinear Dynamics
    Vol.9 (1) pp.011002-(1--10) Published on line: 25 September 2013; Scopus: 2-s2.0-84887862450; WOS: 000328264800003  
    article PDF
    Abstract: The development of a multibody model of a motorbike L-twin engine
    cranktrain is presented in this work. The need for an accurate evaluation
    of the loads acting on the main engine components at high rotational
    speed makes it necessary to take element flexibility into account,
    in order to capture elastodynamic effects which might have a major
    impact on the dynamics of the system. Starting from Finite Element
    descriptions of both the crankshaft and the connecting rod, the classical
    Craig-Bampton technique is employed to obtain reduced models which
    are suitable for the subsequent multibody analysis. A particular
    component mode selection procedure is implemented, based on the concept
    of Effective Interface Mass, allowing an assessment of the accuracy
    of the reduced model prior to the nonlinear simulation phase. Bearing
    dynamics plays also an important role in such a high-speed engine
    application: angular contact ball bearings are modeled according
    to a 5-DOF nonlinear scheme in order to grasp the main bearings behavior,
    while an impedance-based hydrodynamic bearing model is implemented
    providing an enhanced operation prediction at big end locations.
    The assembled cranktrain model is simulated using a commercial multibody
    software platform. Numerical results demonstrate the effectiveness
    of the procedure implemented for the flexible component model reduction.
    The advantages of this technique over the traditional mode truncation
    approach are discussed.Â&circledc; 2014 by ASME.
    BibTeX:
    					@article{Ricci-2014a,
    					  author = {Ricci, S. and Troncossi, M. and Rivola, A.},
    					  title = {Modal Selection Through Effective Interface Mass With Application to Flexible Multibody Cranktrain Dynamics},
    					  journal = {Journal of Computational and Nonlinear Dynamics},
    					  year = {2014},
    					  volume = {9},
    					  number = {1},
    					  pages = {011002-(1--10)},
    					  note = {Published on line: 25 September 2013; Scopus: 2-s2.0-84887862450; WOS: 000328264800003},
    					  url = {http://dx.doi.org/10.1115/1.4025280},
    					  doi = {https://doi.org/10.1115/1.4025280}
    					}
    					
    Rivola-2014a Rivola, A. and Troncossi, M. Zebra tape identification for the instantaneous angular speed computation and angular resampling of motorbike valve train measurements 2014 Mechanical Systems and Signal Processing Special Issue on Instantaneous Angular Speed (IAS) Processing and Angular Applications
    Vol.44 (1-2) pp.5-13 Published on line: 13 February 2013; Scopus: 2-s2.0-84889771966; WOS: 000332048300002  
    article PDF
    Abstract: An experimental test campaign was performed on the valve train of
    a racing motorbike engine in order to get insight into the dynamic
    of the system. In particular the valve motion was acquired in cold
    test conditions by means of a laser vibrometer able to acquire displacement
    and velocity signals. The valve time-dependent measurements needed
    to be referred to the camshaft angular position in order to analyse
    the data in the angular domain, as usually done for rotating machines.
    To this purpose the camshaft was fitted with a zebra tape whose dark
    and light stripes were tracked by means of an optical probe. Unfortunately,
    both manufacturing and mounting imperfections of the employed zebra
    tape, resulting in stripes with slightly different widths, precluded
    the possibility to directly obtain the correct relationship between
    camshaft angular position and time. In order to overcome this problem,
    the identification of the zebra tape was performed by means of the
    original and practical procedure that is the focus of the present
    paper. The method consists of three main steps: namely, an ad-hoc
    test corresponding to special operating conditions, the computation
    of the instantaneous angular speed, and the final association of
    the stripes with the corresponding shaft angular position. The results
    reported in the paper demonstrate the suitability of the simple procedure
    for the zebra tape identification performed with the final purpose
    to implement a computed order tracking technique for the data analysis.
    &circledc; 2012 Elsevier Ltd. All rights reserved.
    BibTeX:
    					@article{Rivola-2014a,
    					  author = {Rivola, A. and Troncossi, M.},
    					  title = {Zebra tape identification for the instantaneous angular speed computation and angular resampling of motorbike valve train measurements},
    					  booktitle = {Special Issue on Instantaneous Angular Speed (IAS) Processing and Angular Applications},
    					  journal = {Mechanical Systems and Signal Processing},
    					  year = {2014},
    					  volume = {44},
    					  number = {1-2},
    					  pages = {5-13},
    					  note = {Published on line: 13 February 2013; Scopus: 2-s2.0-84889771966; WOS: 000332048300002},
    					  url = {http://www.sciencedirect.com/science/article/pii/S0888327012004670},
    					  doi = {https://doi.org/10.1016/j.ymssp.2012.11.009}
    					}
    					
    Rivola-2014b Rivola, A. and Troncossi, M. Dynamic analysis of a motorbike engine timing system: Experimental and numerical investigation of the geartrain 2014 Mechanical Systems and Signal Processing
    Vol.48 (1-2) pp.325-338 Published on line: 12 April 2014; Scopus: 2-s2.0-84901696445; WOS: 000338603900022  
    article PDF
    Abstract: The development of high-performance vehicle engines requires advanced
    investigations in order to provide engineers with proper analysis
    tools to optimize the system design. The elastodynamic behaviour
    of the engine powertrain may be critical at high velocities (when
    the flexibility of the system components can have a major role on
    the overall performance) with consequences on the valve timing and
    the transmission of dynamic loads. A thorough numerical/experimental
    investigation was performed on the timing system of a racing motorbike
    engine. The timing system included the geartrain, which transmits
    power from the crankshaft to the camshafts, and the valve train,
    formed by the camshafts and the cam-follower mechanisms for the valve
    actuation. An experimental campaign was designed and carried out
    with the purpose of inspecting the timing system behaviour for different
    velocities and different design parameters. A numerical model was
    developed in order to provide a simulation/analysis tool that permits
    the design optimization of the main system components. The present
    work focuses on the geartrain elastodynamic analysis, which is the
    main novelty of a long-lasting activity carried out by the authors
    in collaborations with Ducati Motor Holding S.p.a. (Bologna, Italy).
    The experimental campaign, the model development and validation,
    and some simulation results are reported and discussed. &circledc;
    2014 Elsevier Ltd. All rights reserved.
    BibTeX:
    					@article{Rivola-2014b,
    					  author = {Rivola, A. and Troncossi, M.},
    					  title = {Dynamic analysis of a motorbike engine timing system: Experimental and numerical investigation of the geartrain},
    					  journal = {Mechanical Systems and Signal Processing},
    					  publisher = {Academic Press},
    					  year = {2014},
    					  volume = {48},
    					  number = {1-2},
    					  pages = {325-338},
    					  note = {Published on line: 12 April 2014; Scopus: 2-s2.0-84901696445; WOS: 000338603900022},
    					  url = {http://www.sciencedirect.com/science/article/pii/S0888327014000831},
    					  doi = {https://doi.org/10.1016/j.ymssp.2014.03.008}
    					}
    					
    Troncossi-2014a Troncossi, M. and Di Sante, R. and Rivola, A. Displacement measurement on specimens subjected to non-Gaussian random vibrations in fatigue life tests 2014 AIP Conference Proceedings 11th International Conference on Vibration Measurements by Laser and Noncontact Techniques-AIVELA 2014: Advances and Applications, 25-27 June 2014, Ancona, Italy
    Vol.1600 (74) pp.74-82 Scopus: 2-s2.0-84903589935; WOS: 000341380100007  
    conference PDF
    Abstract: High-cycle fatigue life tests conducted using controlled random vibrations
    are commonly used to evaluate failure in components and structures.
    In most cases, a Gaussian distribution of both the input vibration
    and the stress response is assumed, while real-life loads may be
    non-Gaussian causing the response to be non-Gaussian as well. Generating
    non-Gaussian drive signals with high kurtosis and a given power spectral
    density, however, does not always guarantee that the stress response
    will actually be non-Gaussian, because this depends on the adherence
    of the tested system to the Central Limit Theorem. On the other side,
    suitable measurement methods need to be developed in order to estimate
    the stress amplitude response at critical failure locations, and
    therefore to evaluate and select input loads. In this paper, a simple
    test rig with a notched cantilevered specimen was developed to measure
    the response and examine the kurtosis values in the case of stationary
    Gaussian, stationary non-Gaussian, and non-stationary non-Gaussian
    excitation signals. The Laser Doppler Vibrometry (LDV) technique
    was used for the first time in this type of test, to estimate the
    specimen stress amplitude response in terms of differential displacement
    at the notch section ends. A method based on the use of accelerometers
    to correct for the occasional signal drops occurring during the experiment
    is described and the results are discussed with respect to the ability
    of the test procedure to evaluate the output signal.
    BibTeX:
    					@conference{Troncossi-2014a,
    					  author = {Troncossi, M and Di Sante, R and Rivola, A},
    					  title = {Displacement measurement on specimens subjected to non-Gaussian random vibrations in fatigue life tests},
    					  booktitle = {11th International Conference on Vibration Measurements by Laser and Noncontact Techniques-AIVELA 2014: Advances and Applications, 25-27 June 2014, Ancona, Italy},
    					  journal = {AIP Conference Proceedings},
    					  publisher = {American Institute of Physics Inc.},
    					  year = {2014},
    					  volume = {1600},
    					  number = {74},
    					  pages = {74-82},
    					  note = {Scopus: 2-s2.0-84903589935; WOS: 000341380100007},
    					  url = {http://scitation.aip.org/content/aip/proceeding/aipcp/10.1063/1.4879570},
    					  doi = {https://doi.org/10.1063/1.4879570}
    					}
    					
    Troncossi-2014b Troncossi, M. and Rivola, A. Response analysis of specimens excited with non-Gaussian acceleration profiles 2014 ISMA 2014 - International Conference on Noise and Vibration Engineering, 15-17 September 2014, Leuven, Belgium
    pp.799-808 Scopus: 2-s2.0-84913530597; WOS: 000352201001003  
    conference PDF
    Abstract: In the field of vibration qualification testing, a growing interest
    is addressed in the recent years to the socalled ``kurtosis control'',
    aimed at the implementation of acceleration input profiles having
    a non- Gaussian distribution. In this context, an intensive experimental
    campaign was carried out by the authors, leading to fatigue failure
    some special notched specimens subjected to steady Gaussian, steady
    non- Gaussian, and burst non-Gaussian acceleration input profiles.
    The specimen response was measured in terms of both the free end
    acceleration and the relative displacement across its critical section.
    For each test, input and output signals were compared in terms of
    kurtosis and other statistical quantities. The results show that
    only for burst non-Gaussian input profiles the response presents
    a non-Gaussian distribution, with the presence of significant peaks,
    as the input that generated it. The paper illustrates the experimental
    set up and tests procedure, reports the data signal processing (including
    the generation of the input profiles), and finally discusses the
    results retrieved from the tests.
    BibTeX:
    					@conference{Troncossi-2014b,
    					  author = {Troncossi, M. and Rivola, A.},
    					  title = {Response analysis of specimens excited with non-Gaussian acceleration profiles},
    					  booktitle = {ISMA 2014 - International Conference on Noise and Vibration Engineering, 15-17 September 2014, Leuven, Belgium},
    					  publisher = {KU Leuven},
    					  year = {2014},
    					  pages = {799-808},
    					  note = {Scopus: 2-s2.0-84913530597; WOS: 000352201001003},
    					  url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84913530597&partnerID=40&md5=2de120853389b3e7e69c71ee8577f9ce}
    					}
    					
    Troncossi-2014c Troncossi, M. and Mucchi, E. and Rivola, A. Torsional Vibration Analysis of a Test Rig Driveline Equipped with a Flexible Coupling 2014 RECENT ADVANCES IN MECHANICAL ENGINEERING SERIES Proceedings of the 5th European Conference of Mechanical Engineering (ECME' 14), November 22-24, 2014, Florence, Italy
    pp.198-206 Scopus: 2-s2.0-xxxxxxx; WOS: xxxxxxxxx  
    conference
    Abstract: The paper deals with a case study from the automotive industry and
    relative to a test rig of internal combustion engines: the output
    shaft of the engine transmission is connected with an electromechanical
    brake by means of a transmission shaft which hosts a torsional coupling
    with rubber elements. The engine test cell was developed several
    years ago; over years, the engine operations and performance have
    been changed, in terms of output power and torque, entailing more
    severe dynamic loads affecting the driveline members. In this scenario,
    early failures of the rubber elements of the flexible coupling have
    occurred. The goal is to solve the problem by bringing the fewest
    possible modifications to the cell layout. An experimental campaign
    was thus carried out, with the aim of characterizing the current
    system dynamic behavior and finding possible modifications able to
    solve the problem. In particular, torsional vibration measurements
    have been achieved by a coder-based technique using high-quality
    optical sensors and equidistantly spaced markers (zebra tape) on
    the rotating components. The measured data were analyzed in the Time,
    Frequency, Time-Frequency, and Order domains. The paper presents
    the experimental setup, the data processing and the results obtained
    from tests performed on the original system and on a modified version
    of the transmission driveline, after changing the elastodynamic properties
    of the coupling.
    BibTeX:
    					@conference{Troncossi-2014c,
    					  author = {Troncossi, M. and Mucchi, E. and Rivola, A.},
    					  title = {Torsional Vibration Analysis of a Test Rig Driveline Equipped with a Flexible Coupling},
    					  booktitle = {Proceedings of the 5th European Conference of Mechanical Engineering (ECME' 14), November 22-24, 2014, Florence, Italy},
    					  journal = {RECENT ADVANCES IN MECHANICAL ENGINEERING SERIES},
    					  year = {2014},
    					  pages = {198-206},
    					  note = {Scopus: 2-s2.0-xxxxxxx; WOS: xxxxxxxxx}
    					}
    					
    Martini-2013a Martini, A. and Troncossi, M. and Rivola, A. and Nascetti, D. Preliminary investigations on automatic detection of leaks in water distribution networks by means of vibration monitoring 2013 3rd International Conference on Condition Monitoring of Machinery in Non-Stationary Operations (CMMNO2013), 8-10 October 2013, Ferrara, Italy
    pp.1-10  
    conference
    Abstract: The efficiency of water supply networks is an important issue. In
    order to reduce water losses, policies of leak reduction are essential.
    The paper deals with a preliminary study on the use of vibration
    monitoring tools for the detection of leaks in water service pipelines.
    The long-term project is the development of a system for automatically
    detecting burst leaks occurring in service pipes. Prelimi-nary experimental
    tests were performed on both a test rig and an actual service pipe
    of the water distribution system. Three main objectives were achieved:
    first-ly, the effectiveness of vibration monitoring for leak detection
    purposes was as-sessed providing a positive response; then, a prototypal
    detection procedure was studied, implemented and tested on the preliminary
    experimental data; finally, the specifications for a prototypal acquisition
    equipment were also determined. This paper illustrates the experimental
    campaign and its main results.
    BibTeX:
    					@conference{Martini-2013a,
    					  author = {Martini, A. and Troncossi, M. and Rivola, A. and Nascetti, D.},
    					  title = {Preliminary investigations on automatic detection of leaks in water distribution networks by means of vibration monitoring},
    					  booktitle = {3rd International Conference on Condition Monitoring of Machinery in Non-Stationary Operations (CMMNO2013), 8-10 October 2013, Ferrara, Italy},
    					  year = {2013},
    					  pages = {1-10}
    					}
    					
    Martini-2013b Martini, A. and Troncossi, M. and Rivola, A. Vibration monitoring as a tool for leak detection in water distribution networks 2013 7th International Conference on Acoustical and Vibratory Surveillance Methods and Diagnostic Techniques (Surveillance 7), 29-30 October 2013, Chartres, France
    pp.1-9  
    conference
    Abstract: The control of water leaks in water distribution networks represents
    a critical issue for all utilities involved in drinking water supply.
    This paper deals with the detection of water leaks by using vibration
    monitoring techniques. The long-term objective is the development
    of a system for the automatic early detection of burst leaks in service
    pipes. An experimental campaign was started in order to measure vibrations
    transmitted through water pipes by real burst leaks occurring in
    an actual water supply network. The first experimental data were
    used for testing a prototypal algorithm for leak detection purpose,
    based on the calculation of the standard deviation of acceleration
    signals. The experimental campaign is here described and the results
    achieved by applying the algorithm are presented and discussed. The
    current algorithm exhibited satisfactory performances, with 10 of
    the 13 examined leaks being successfully detected.
    BibTeX:
    					@conference{Martini-2013b,
    					  author = {Martini, A. and Troncossi, M. and Rivola, A.},
    					  title = {Vibration monitoring as a tool for leak detection in water distribution networks},
    					  booktitle = {7th International Conference on Acoustical and Vibratory Surveillance Methods and Diagnostic Techniques (Surveillance 7), 29-30 October 2013, Chartres, France},
    					  year = {2013},
    					  pages = {1-9}
    					}
    					
    Martini-2013c Martini, A. and Troncossi, M. and Rivola, A. Elastodynamic effects of mass-balancing: experimental investigation of a four-bar linkage 2013 Advances in Mechanical Engineering
    Vol.2013 pp.1-10 article no. 949457, Scopus: 2-s2.0-84888607853; WOS: 000327062300001  
    article PDF
    Abstract: This paper deals with static balancing of closed-loop mechanisms.
    The long-term goal of the research is enhancing the performance of
    parallel robots by means of effective static balancing strategies
    that take into account the system dynamic behaviour. In this contribution,
    the influence of mass-balancing on the elastodynamic performance
    of a four-bar linkage, intended as the simplest example of closed-loop
    mechanism, is experimentally investigated. The design of the experimental
    apparatus is discussed and the results of tests on both an unbalanced
    linkage and its balanced variant are presented. Base-transmitted
    forces and vibrations are monitored for constant-speed operations
    and for velocity ramp tests in order to characterize the elastodynamic
    behaviour of the linkages. The analysis is supported by implementing
    a flexible multibody model of the experimental apparatus that enhances
    the interpretation of the experimental data.
    BibTeX:
    					@article{Martini-2013c,
    					  author = {Martini, A. and Troncossi, M. and Rivola, A.},
    					  title = {Elastodynamic effects of mass-balancing: experimental investigation of a four-bar linkage},
    					  journal = {Advances in Mechanical Engineering},
    					  year = {2013},
    					  volume = {2013},
    					  pages = {1-10},
    					  note = {article no. 949457, Scopus: 2-s2.0-84888607853; WOS: 000327062300001},
    					  url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84888607853&partnerID=40&md5=d2e3ef1064c8235c77a3b314a1f2bbef},
    					  doi = {https://doi.org/10.1155/2013/949457}
    					}
    					
    Troncossi-2013a Troncossi, M. and Cipollini, R. and Rivola, A. Experimental Evaluation of the FDS-based Equivalence Approach for the Mission Synthesis in Accelerated Life Tests 2013 20th International Congress on Sound and Vibration (ICSV20), 7-11 July 2013, Bangkok, Thailand
    Vol.1 pp.596-603 Conference Code:103420; Scopus: 2-s2.0-84897081983  
    conference PDF
    Abstract: This paper deals with the application of a method conceived to synthesize
    stationary vibration profiles with limited duration starting from
    long lasting reference environmental data. The aim of the research
    is to experimentally verify the soundness of the approach by performing
    simple tests on specimens purposely conceived. This paper recalls
    the background of the method, illustrates the experimental setup
    and procedures, and finally report the results of some tests that
    point out critical issues associated with the high sensitivity of
    the method application with respect to a parameter related to the
    material characteristics (namely the fatigue curve slope in the Wholer
    diagram).
    BibTeX:
    					@conference{Troncossi-2013a,
    					  author = {Troncossi, M. and Cipollini, R. and Rivola, A.},
    					  title = {Experimental Evaluation of the FDS-based Equivalence Approach for the Mission Synthesis in Accelerated Life Tests},
    					  booktitle = {20th International Congress on Sound and Vibration (ICSV20), 7-11 July 2013, Bangkok, Thailand},
    					  publisher = {International Institute of Acoustics and Vibrations},
    					  year = {2013},
    					  volume = {1},
    					  pages = {596-603},
    					  note = {Conference Code:103420; Scopus: 2-s2.0-84897081983},
    					  url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84897081983&partnerID=40&md5=4a170e46ed57e3567989036ca92ce20b}
    					}
    					
    Martini-2012a Martini, A. and Troncossi, M. and Rivola, A. Feasibility Investigation on Detection of Water Leaks in Pipelines by Means of Vibration Monitoring 2012 Sesta giornata di studio Ettore Funaioli - 16 luglio 2012
    pp.323-332  
    incollection PDF
    BibTeX:
    					@incollection{Martini-2012a,
    					  author = {Martini, A. and Troncossi, M. and Rivola A.},
    					  title = {Feasibility Investigation on Detection of Water Leaks in Pipelines by Means of Vibration Monitoring},
    					  booktitle = {Sesta giornata di studio Ettore Funaioli - 16 luglio 2012},
    					  publisher = {Società Editrice Esculapio},
    					  year = {2012},
    					  pages = {323-332},
    					  url = {http://amsacta.unibo.it/3715/},
    					  doi = {https://doi.org/10.6092/unibo/amsacta/3715}
    					}
    					
    Troncossi-2012a Troncossi, M. and Gruppioni, E. and Rivola, A. Assessment of Efficiency and Vibro-Acoustic Behaviour of Prosthesis Prototypes 2012 15th International Conference on Experimental Mechanics, 22-27 July 2012, Porto, Portugal
    pp.425-426 WOS: 000320722900058  
    conference
    BibTeX:
    					@conference{Troncossi-2012a,
    					  author = {Troncossi, M. and Gruppioni, E. and Rivola, A.},
    					  title = {Assessment of Efficiency and Vibro-Acoustic Behaviour of Prosthesis Prototypes},
    					  booktitle = {15th International Conference on Experimental Mechanics, 22-27 July 2012, Porto, Portugal},
    					  year = {2012},
    					  pages = {425-426},
    					  note = {WOS: 000320722900058}
    					}
    					
    Cipollini-2011a Cipollini, R. and Rivola, A. Flexible multibody modelling of a motorbike timing system as a tool for the engine design optimization 2011 Quinta giornata di studio Ettore Funaioli - 15 luglio 2011
    pp.323-331  
    incollection PDF
    BibTeX:
    					@incollection{Cipollini-2011a,
    					  author = {Cipollini, R. and Rivola, A.},
    					  title = {Flexible multibody modelling of a motorbike timing system as a tool for the engine design optimization},
    					  booktitle = {Quinta giornata di studio Ettore Funaioli - 15 luglio 2011},
    					  publisher = {Società Editrice Esculapio},
    					  year = {2011},
    					  pages = {323-331},
    					  url = {http://amsacta.unibo.it/3310/},
    					  doi = {https://doi.org/10.6092/unibo/amsacta/3310}
    					}
    					
    Cipollini-2011b Cipollini, R. and Rivola, A. Flexible multibody model of a motorbike timing system 2011 AIMETA 2011, XX Italian Conference on Theoretical and Applied Mechanics, 12-15 September 2011, Bologna, Italy
    pp.1-10  
    conference
    BibTeX:
    					@conference{Cipollini-2011b,
    					  author = {Cipollini, R. and Rivola, A.},
    					  title = {Flexible multibody model of a motorbike timing system},
    					  booktitle = {AIMETA 2011, XX Italian Conference on Theoretical and Applied Mechanics, 12-15 September 2011, Bologna, Italy},
    					  year = {2011},
    					  pages = {1-10}
    					}
    					
    Martini-2011a Martini, A. and Troncossi, M. and Rivola, A. Experimental and Numerical Analyses of a Mass-Balanced Four-Bar Linkage 2011 Proceedings of ECCOMAS, Multibody Dynamics 2011, 4-7 July 2011, Brussels, Belgium
    pp.1-17  
    conference
    BibTeX:
    					@conference{Martini-2011a,
    					  author = {Martini, A. and Troncossi, M. and Rivola, A.},
    					  title = {Experimental and Numerical Analyses of a Mass-Balanced Four-Bar Linkage},
    					  booktitle = {Proceedings of ECCOMAS, Multibody Dynamics 2011, 4-7 July 2011, Brussels, Belgium},
    					  year = {2011},
    					  pages = {1-17}
    					}
    					
    Mucchi-2011a Mucchi, E. and Dalpiaz, G. and Rivola, A. Dynamic behavior of gear pumps: Effect of variations in operational and design parameters 2011 Meccanica
    Vol.46 (6) pp.1191-1212 Scopus: 2-s2.0-81955163105; WOS: 000297130200003  
    article PDF
    Abstract: This work presents a wide number of results about the influence that
    variations in terms of operational and design parameters play on
    the dynamic behavior of external gear pumps. These results are obtained
    by using a non-linear lumped-parameter kineto-elastodynamic model
    developed and experimentally assessed with the aim of including all
    the important dynamic effects. On the one hand, the effects of variations
    in the operational parameters-namely output pressure, rotational
    speed and oil viscosity-are analysed; on the other hand, the effects
    of modifications of some design parameters are shown: clearances
    and relief groove dimension. The results in terms of gear eccentricity,
    pressure evolution, pressure forces, gear accelerations and variable
    forces exciting the pump casing enlighten the dynamic behavior of
    gear pumps and give useful indications for design improvements and
    vibration and noise reduction. As regards specifically gear accelerations
    as well as forces exciting the casing, they strongly increase with
    both output pressure and rotational speed, but variations in rotational
    speed in the operational range give lower effects. Conversely, the
    modifications of the clearances give negligible effects, while the
    relief groove dimension is very important: the larger the relief
    grooves are, the higher the gear accelerations and forces exciting
    the casing become. &circledc; 2010 Springer Science+Business Media
    B.V.
    BibTeX:
    					@article{Mucchi-2011a,
    					  author = {Mucchi, E. and Dalpiaz, G. and Rivola, A.},
    					  title = {Dynamic behavior of gear pumps: Effect of variations in operational and design parameters},
    					  journal = {Meccanica},
    					  year = {2011},
    					  volume = {46},
    					  number = {6},
    					  pages = {1191-1212},
    					  note = {Scopus: 2-s2.0-81955163105; WOS: 000297130200003},
    					  url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-81955163105&partnerID=40&md5=b1a94c3aedfb92290b07164a04eb31ad},
    					  doi = {https://doi.org/10.1007/s11012-010-9376-y}
    					}
    					
    Ricci-2011a Ricci, S. and Troncossi, M. and Rivola, A. Model reduction of the flexible rotating crankshaft of a motorcycle engine cranktrain 2011 International Journal of Rotating Machinery
    Vol.2011 pp.1-9 article no. 143523; Scopus: 2-s2.0-80052666850  
    article PDF
    Abstract: This paper addresses the development of an elastodynamic model of
    a motorcycle engine cranktrain aimed at accurately evaluating the
    interactions between the crankshaft and the engine block, thus allowing
    an improved structural design. A rigid multibody model is first implemented
    and simulated; only kinematic joints are involved at this stage,
    leading to a statically determinate assembly of the mechanism. Such
    a modelling approach prevents the loads at certain interface locations
    to be evaluated; furthermore, high-frequency dynamic effects cannot
    be predicted. These drawbacks can be removed by introducing bushing-like
    elements and/or modelling component flexibility. In this paper, this
    latter aspect is the objective of the investigation; in particular,
    a finite element model of the crankshaft is implemented as a replacement
    for the corresponding rigid member. The well-established Craig-Bampton
    model reduction technique is used to represent the elastodynamic
    behaviour of the component with a limited number of coordinates.
    The mode selection procedure is emphasized here: a measure of modal
    dynamic importance, namely the effective interface mass fraction,
    is used to rank fixed-interface normal modes based upon their contribution
    to loads at the substructure interface; choosing the modal base according
    to such ranking leads to a minimal yet accurate representation. Copyright
    &circledc; 2011 Stefano Ricci et al.
    BibTeX:
    					@article{Ricci-2011a,
    					  author = {Ricci, S. and Troncossi, M. and Rivola, A.},
    					  title = {Model reduction of the flexible rotating crankshaft of a motorcycle engine cranktrain},
    					  journal = {International Journal of Rotating Machinery},
    					  year = {2011},
    					  volume = {2011},
    					  pages = {1-9},
    					  note = {article no. 143523; Scopus: 2-s2.0-80052666850},
    					  url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-80052666850&partnerID=40&md5=bed6105911c19db5e992fb01653fb690},
    					  doi = {https://doi.org/10.1155/2011/143523}
    					}
    					
    Rivola-2011a Rivola, A. and Troncossi, M. A practical procedure for angular resampling applied to motion measurements on a motorbike valvetrain 2011 6th International Conference on Acoustical and Vibratory Surveillance Methods and Diagnostic Techniques (Surveillance 6), 25-26 October 2011, Compiègne, France
    pp.1-10  
    conference
    BibTeX:
    					@conference{Rivola-2011a,
    					  author = {Rivola, A. and Troncossi, M.},
    					  title = {A practical procedure for angular resampling applied to motion measurements on a motorbike valvetrain},
    					  booktitle = {6th International Conference on Acoustical and Vibratory Surveillance Methods and Diagnostic Techniques (Surveillance 6), 25-26 October 2011, Compiègne, France},
    					  year = {2011},
    					  pages = {1-10}
    					}
    					
    Bruzzi-2010a Bruzzi, D. and Corbelli, A. and Rivola, A. and Tortora, P. and Camauli, G. Test di vibrazione condotti sul microsatellite Almasat-1 2010 Tutto Misure
    Vol.2 pp.123-127  
    article
    Abstract: Il presente articolo illustra e riassume l'attività di qualifica
    al volo spaziale dei sottosistemi del satellite ALMASat-1 svolta
    presso il laboratorio per prove di vibrazione della Seconda Facoltà
    di Ingegneria dell'Università di Bologna, sede di Forl\i.
    Nello specifico, vengono presentati i test di vibrazione condotti
    sui singoli sottosistemi che compongono il microsatellite universitario,
    allo scopo di verificare la robustezza dei diversi componenti alle
    sollecitazioni previste durante il lancio, che avverrà mediante
    il lanciatore VEGA, a bordo del quale ALMASat-1 sarà alloggiato.
    Per l'esecuzione dei test sono stati utilizzati uno shaker elettrodinamico
    Dongling ES-2-150 e la relativa piattaforma di controllo e acquisizione
    LMS Test.Lab/SCADAS III, forniti da LMS Italiana, in dotazione al
    laboratorio.
    BibTeX:
    					@article{Bruzzi-2010a,
    					  author = {Bruzzi, D. and Corbelli, A. and Rivola, A. and Tortora, P. and Camauli, G.},
    					  title = {Test di vibrazione condotti sul microsatellite Almasat-1},
    					  journal = {Tutto Misure},
    					  year = {2010},
    					  volume = {2},
    					  pages = {123-127}
    					}
    					
    Mucchi-2010a Mucchi, E. and Dalpiaz, G. and Rivola, A. Elastodynamic analysis of a gear pump. Part II: Meshing phenomena and simulation results 2010 Mechanical Systems and Signal Processing
    Vol.24 (7) pp.2180-2197 Scopus: 2-s2.0-77955563589; WOS: 000280940200019  
    article PDF
    Abstract: A non-linear lumped kineto-elastodynamic model for the prediction
    of the dynamic behaviour of external gear pumps is presented. It
    takes into account the most important phenomena involved in the operation
    of this kind of machines. Two main sources of noise and vibration
    can be considered: pressure and gear meshing. Fluid pressure distribution
    on gears, which is time-varying, is computed and included as a resultant
    external force and torque acting on the gears. Parametric excitations
    due to time-varying meshing stiffness, the tooth profile errors (obtained
    by a metrological analysis), the backlash effects between meshing
    teeth, the lubricant squeeze and the possibility of tooth contact
    on both lines of action were also included. Finally, the torsional
    stiffness and damping of the driving shaft and the non-linear behaviour
    of the hydrodynamic journal bearings were also taken into account.
    Model validation was carried out on the basis of experimental data
    concerning case accelerations and force reactions. The model can
    be used in order to analyse the pump dynamic behaviour and to identify
    the effects of modifications in design and operation parameters,
    in terms of vibration and dynamic forces. Part I is devoted to the
    calculation of the gear eccentricity in the steady-state condition
    as result of the balancing between mean pressure loads, mean meshing
    force and bearing reactions, while in Part II the meshing phenomena
    are fully explained and the main simulation results are presented.
    &circledc; 2010 Elsevier Ltd. All rights reserved.
    BibTeX:
    					@article{Mucchi-2010a,
    					  author = {Mucchi, E. and Dalpiaz, G. and Rivola, A.},
    					  title = {Elastodynamic analysis of a gear pump. Part II: Meshing phenomena and simulation results},
    					  journal = {Mechanical Systems and Signal Processing},
    					  year = {2010},
    					  volume = {24},
    					  number = {7},
    					  pages = {2180-2197},
    					  note = {Scopus: 2-s2.0-77955563589; WOS: 000280940200019},
    					  url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-77955563589&partnerID=40&md5=0b19161ec688d35177aac1a9932dfe72},
    					  doi = {https://doi.org/10.1016/j.ymssp.2010.02.004}
    					}
    					
    Ricci-2010a Ricci, S. and Troncossi, M. and Rivola, A. Component mode selection in flexible multibody dynamics with application to cranktrain modelling 2010 ISMA 2010 - International Conference on Modal Analysis Noise and Vibration Engineering, 20-22 September 2010, Leuven, Belgium
    pp.3047-3060 Scopus: 2-s2.0-84951110627; WOS: 000302905400227  
    conference
    BibTeX:
    					@conference{Ricci-2010a,
    					  author = {Ricci, S. and Troncossi, M. and Rivola, A.},
    					  title = {Component mode selection in flexible multibody dynamics with application to cranktrain modelling},
    					  booktitle = {ISMA 2010 - International Conference on Modal Analysis Noise and Vibration Engineering, 20-22 September 2010, Leuven, Belgium},
    					  year = {2010},
    					  pages = {3047-3060},
    					  note = {Scopus: 2-s2.0-84951110627; WOS: 000302905400227}
    					}
    					
    Ricci-2010b Ricci, S. and Troncossi, M. and Rivola, A. Flexible multibody modeling of a racing motorcycle cranktrain: model reduction issues 2010 International Conference on Multibody System Dynamics, May 25-27 2010, Lappeenranta, Finland
    pp.1-10  
    conference
    BibTeX:
    					@conference{Ricci-2010b,
    					  author = {Ricci, S. and Troncossi, M. and Rivola, A.},
    					  title = {Flexible multibody modeling of a racing motorcycle cranktrain: model reduction issues},
    					  booktitle = {International Conference on Multibody System Dynamics, May 25-27 2010, Lappeenranta, Finland},
    					  year = {2010},
    					  pages = {1-10}
    					}
    					
    Troncossi-2010a Troncossi, M. and Rivola, A. Experimental Tests of Joint Prototypes for Upper Limb Powered Prostheses 2010 Quarta giornata di studio Ettore Funaioli - 16 luglio 2010
    pp.73-82  
    incollection PDF
    BibTeX:
    					@incollection{Troncossi-2010a,
    					  author = {Troncossi, M. and Rivola, A.},
    					  title = {Experimental Tests of Joint Prototypes for Upper Limb Powered Prostheses},
    					  booktitle = {Quarta giornata di studio Ettore Funaioli - 16 luglio 2010},
    					  publisher = {Asterisco},
    					  year = {2010},
    					  pages = {73-82},
    					  url = {http://amsacta.cib.unibo.it/3043/},
    					  doi = {https://doi.org/10.6092/unibo/amsacta/3043}
    					}
    					
    Bruzzi-2009a Bruzzi, D. and Corbelli, A. and Rivola, A. and Tortora, P. and Camauli, G. Test di vibrazione condotti sul microsatellite Almasat-1 2009 Tutto Misure News
    Vol.3 pp.1-5  
    article PDF
    Abstract: Il presente articolo illustra e riassume l'attività di qualifica
    al volo spaziale dei sottosistemi del satellite ALMASat-1 svolta
    presso il laboratorio per prove di vibrazione della Seconda Facoltà
    di Ingegneria dell'Università di Bologna, sede di Forl\i.
    Nello specifico, vengono presentati i test di vibrazione condotti
    sui singoli sottosistemi che compongono il microsatellite universitario,
    allo scopo di verificare la robustezza dei diversi componenti alle
    sollecitazioni previste durante il lancio, che avverrà mediante
    il lanciatore VEGA, a bordo del quale ALMASat-1 sarà alloggiato.
    Per l'esecuzione dei test sono stati utilizzati uno shaker elettrodinamico
    Dongling ES-2-150 e la relativa piattaforma di controllo e acquisizione
    LMS Test.Lab/SCADAS III, forniti da LMS Italiana, in dotazione al
    laboratorio.
    BibTeX:
    					@article{Bruzzi-2009a,
    					  author = {Bruzzi, D. and Corbelli, A. and Rivola, A. and Tortora, P. and Camauli, G.},
    					  title = {Test di vibrazione condotti sul microsatellite Almasat-1},
    					  journal = {Tutto Misure News},
    					  year = {2009},
    					  volume = {3},
    					  pages = {1-5},
    					  url = {http://www.affidabilita.eu/tuttomisure/articolo.aspx?idArt=234}
    					}
    					
    Martini-2009a Martini, A. and Troncossi, M. and Carricato, M. and Rivola, A. Modal and Kineto-elastodynamic Analyses of Balanced Four-bar Linkages 2009 ECCOMAS, Multibody Dynamics 2009, 29 June-2 July 2009, Warsaw, Poland
    pp.1-20  
    conference
    BibTeX:
    					@conference{Martini-2009a,
    					  author = {Martini, A. and Troncossi, M. and Carricato, M. and Rivola, A.},
    					  title = {Modal and Kineto-elastodynamic Analyses of Balanced Four-bar Linkages},
    					  booktitle = {ECCOMAS, Multibody Dynamics 2009, 29 June-2 July 2009, Warsaw, Poland},
    					  year = {2009},
    					  pages = {1-20}
    					}
    					
    Martini-2009b Martini, A. and Troncossi, M. and Rivola, A. Modal and Kineto-elastodynamic Analyses of Flexible-body Mechanisms by Using MD Patran, MD Nastran and MD Adams 2009 VPD2009, MSC.Software Virtual Product Development Conference, May 12-13 2009, Munich, Germany
    pp.1-20  
    conference
    BibTeX:
    					@conference{Martini-2009b,
    					  author = {Martini, A. and Troncossi, M. and Rivola, A.},
    					  title = {Modal and Kineto-elastodynamic Analyses of Flexible-body Mechanisms by Using MD Patran, MD Nastran and MD Adams},
    					  booktitle = {VPD2009, MSC.Software Virtual Product Development Conference, May 12-13 2009, Munich, Germany},
    					  year = {2009},
    					  pages = {1-20}
    					}
    					
    Ricci-2009a Ricci, S. and Troncossi, M. and Rivola, A. Development of a flexible multibody model of a motorcycle engine cranktrain 2009 Terza giornata di studio Ettore Funaioli - 16 luglio 2009
    pp.89-100  
    incollection PDF
    BibTeX:
    					@incollection{Ricci-2009a,
    					  author = {Ricci, S. and Troncossi, M. and Rivola, A.},
    					  title = {Development of a flexible multibody model of a motorcycle engine cranktrain},
    					  booktitle = {Terza giornata di studio Ettore Funaioli - 16 luglio 2009},
    					  publisher = {Asterisco},
    					  year = {2009},
    					  pages = {89-100},
    					  url = {http://amsacta.unibo.it/2771/},
    					  doi = {https://doi.org/10.6092/unibo/amsacta/2771}
    					}
    					
    Troncossi-2009a Troncossi, M. and Rivola, A. Modal parameter estimation of a PVC-product cleaning machine by means of operational modal analysis 2009 International Operational Modal Analysis Conference, May 5-6 2009, Ancona, Italy
    pp.103-110 Scopus: 2-s2.0-84906246106; WOS: xxxxxxxxx  
    conference PDF
    Abstract: The prototype of a machine tool for the fine machining of PVC window
    casings was recently developed and tested. Preliminary tests pointed
    out that excessive vibrations arise during the execution of some
    operative motion laws, possibly affecting the product quality. Some
    structural modification of the machine is thus needed in order to
    reduce the vibration level. In this context, modal analysis of the
    machine prototype can be useful to guide the design modifications.
    In order to excite the system consistently with the operative working
    conditions, the operational modal analysis was considered more suitable
    than the traditional experimental modal analysis. The excitation
    was provided by executing of an impulsive motion law of the machine
    part hosting the tools, which provides a flat spectrum in the bandwidth
    of interest. This paper illustrates the main practical aspects of
    the experimental tests and the results that were obtained by using
    a commercial software.
    BibTeX:
    					@conference{Troncossi-2009a,
    					  author = {Troncossi, M. and Rivola, A.},
    					  title = {Modal parameter estimation of a PVC-product cleaning machine by means of operational modal analysis},
    					  booktitle = {International Operational Modal Analysis Conference, May 5-6 2009, Ancona, Italy},
    					  publisher = {Starrylink Editrice},
    					  year = {2009},
    					  pages = {103-110},
    					  note = {Scopus: 2-s2.0-84906246106; WOS: xxxxxxxxx},
    					  url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84906246106&partnerID=40&md5=75ab8911e1e2364e65517a8b0dfb22be}
    					}
    					
    Martini-2008a Martini, A. and Troncossi, M. and Carricato, M. and Rivola, A. On the elastodynamic behaviour of balanced closed-loop mechanisms: numerical analysis of a four-bar linkage 2008 Seconda giornata di studio in onore di Ettore Funaioli - 18 luglio 2008
    pp.1-12  
    incollection PDF
    BibTeX:
    					@incollection{Martini-2008a,
    					  author = {Martini, A. and Troncossi, M. and Carricato, M. and Rivola, A.},
    					  title = {On the elastodynamic behaviour of balanced closed-loop mechanisms: numerical analysis of a four-bar linkage},
    					  booktitle = {Seconda giornata di studio in onore di Ettore Funaioli - 18 luglio 2008},
    					  publisher = {Asterisco},
    					  year = {2008},
    					  pages = {1-12},
    					  url = {http://amsacta.unibo.it/2552/},
    					  doi = {https://doi.org/10.6092/unibo/amsacta/2552}
    					}
    					
    Rivola-2008a Rivola, A. and Milandri, M. and Mucchi, E. A Model for the Elastodynamic Analysis of the Geared Timing System of a Motorbike Engine 2008 ISMA 2008 - International Conference on Modal Analysis Noise and Vibration Engineering, 15-17 September 2008, Leuven, Belgium
    Vol.4 pp.2113-2127 Scopus: 2-s2.0-84906343591; WOS: 000263409901034  
    conference PDF
    Abstract: This work deals with the elastodynamic model of the geared valvetrain
    of a four-cylinder "L" engine of a Ducati racing motorbike. The model,
    which is an evolution of the author's research, is obtained as a
    combination of lumped parameter and finite element parts. The model
    is able to inspect the dynamic behaviour of both the geartrain and
    the cam-valve mechanisms. The paper mainly describes the model validation
    process that is based on several experimental tests and it is achieved
    by means of different steps. The information obtained from the validation
    stages have been finally employed for the tuning of the combined
    lumped/finite element model of the geared timing system. The experimental
    procedures are also illustrated, together with some details on the
    signal treatments. The comparison between simulations an experiments
    shows that the effectiveness of the model is satisfactorily assessed,
    thus permitting the use of the model as a tool for the design optimisation
    of the motorbike timing system. The results obtained for the competitive
    motorbike engine can also be utilized for common production engines,
    where conformity to vibration and noise standards must be fulfilled.
    BibTeX:
    					@conference{Rivola-2008a,
    					  author = {Rivola, A. and Milandri, M. and Mucchi, E.},
    					  title = {A Model for the Elastodynamic Analysis of the Geared Timing System of a Motorbike Engine},
    					  booktitle = {ISMA 2008 - International Conference on Modal Analysis Noise and Vibration Engineering, 15-17 September 2008, Leuven, Belgium},
    					  publisher = {Katholieke Universiteit Leuven},
    					  year = {2008},
    					  volume = {4},
    					  pages = {2113-2127},
    					  note = {Scopus: 2-s2.0-84906343591; WOS: 000263409901034},
    					  url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84906343591&partnerID=40&md5=39ab33d026f29dcdf3c4e00f8e079632}
    					}
    					
    Troncossi-2008a Troncossi, M. and Troiani, E. and Rivola, A. Design optimization of a laser cutting machine by elastodynamic modeling 2008 9th Biennial ASME Conference on Engineering Systems Design and Analysis - ESDA2008, July 7-9 2008, Haifa, Israel
    pp.1-9  
    conference
    Abstract: This study deals with the elastodynamic modeling of a laser cutting
    machine and illustrates the guidelines followed for the design optimization
    of the machine's basic structure from the dynamic behavior point
    of view. A finite element model was set up along with the conceptual
    design of the new machine, with the aim of performing dynamic simulations.
    The main purpose is to predict the vibrations arising in the structure
    that could significantly deteriorate the product quality in order
    to evaluate different design solutions. The vibrations can be excited
    by variable forces acting on the moving masses and by the oscillations
    affecting the machine basement due to external causes. The original
    modeling of the excitations is presented herein. Modal analysis and
    forced simulations were performed on the finite element model of
    the first conceptual design of the machine structure. The analysis
    of the results indicated some critical parts of the system to be
    stiffened in order to mitigate the vibrations, that is to improve
    the cutting quality. Structural modifications to the first conceptual
    design were therefore suggested and a new model of the machine was
    developed and simulated. The results of the simulations before and
    after the design modifications are reported and discussed. Copyright
    &circledc; 2008 by ASME.
    BibTeX:
    					@conference{Troncossi-2008a,
    					  author = {Troncossi, M. and Troiani, E. and Rivola, A.},
    					  title = {Design optimization of a laser cutting machine by elastodynamic modeling},
    					  booktitle = {9th Biennial ASME Conference on Engineering Systems Design and Analysis - ESDA2008, July 7-9 2008, Haifa, Israel},
    					  year = {2008},
    					  pages = {1-9}
    					}
    					
    Troncossi-2008b Troncossi, M. and Troiani, E. and Rivola, A. Design optimization of a laser cutting machine by elastodynamic modeling 2008 Automotive Systems; Bioengineering and Biomedical Technology; Computational Mechanics; Controls; Dynamical Systems
    Vol.2 pp.551-559 Scopus: 2-s2.0-70349102072; WOS: 000263619300070  
    incollection PDF
    Abstract: This study deals with the elastodynamic modeling of a laser cutting
    machine and illustrates the guidelines followed for the design optimization
    of the machine's basic structure from the dynamic behavior point
    of view. A finite element model was set up along with the conceptual
    design of the new machine, with the aim of performing dynamic simulations.
    The main purpose is to predict the vibrations arising in the structure
    that could significantly deteriorate the product quality in order
    to evaluate different design solutions. The vibrations can be excited
    by variable forces acting on the moving masses and by the oscillations
    affecting the machine basement due to external causes. The original
    modeling of the excitations is presented herein. Modal analysis and
    forced simulations were performed on the finite element model of
    the first conceptual design of the machine structure. The analysis
    of the results indicated some critical parts of the system to be
    stiffened in order to mitigate the vibrations, that is to improve
    the cutting quality. Structural modifications to the first conceptual
    design were therefore suggested and a new model of the machine was
    developed and simulated. The results of the simulations before and
    after the design modifications are reported and discussed. Copyright
    &circledc; 2008 by ASME.
    BibTeX:
    					@incollection{Troncossi-2008b,
    					  author = {Troncossi, M. and Troiani, E. and Rivola, A.},
    					  title = {Design optimization of a laser cutting machine by elastodynamic modeling},
    					  booktitle = {Automotive Systems; Bioengineering and Biomedical Technology; Computational Mechanics; Controls; Dynamical Systems},
    					  publisher = {ASME},
    					  year = {2008},
    					  volume = {2},
    					  pages = {551-559},
    					  note = {Scopus: 2-s2.0-70349102072; WOS: 000263619300070},
    					  url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-70349102072&partnerID=40&md5=a589533b1202d966bd017ac736588d01},
    					  doi = {dx.doi.org/10.1115/ESDA2008-59166}
    					}
    					
    DelVecchio-2007a Del Vecchio, S. and Dalpiaz, G. and Niculita, O. and Rivola, A. Condition Monitoring in Diesel Engines for Cold Test Applications. Part I: Vibration Analysis for Pass/Fail Decision 2007 COMADEM 2007, International Congress on Condition Monitoring and Diagnostics Engineering Management, 13-15 June 2007, Faro, Portugal
    pp.197-206  
    conference
    BibTeX:
    					@conference{DelVecchio-2007a,
    					  author = {Del Vecchio, S. and Dalpiaz, G. and Niculita, O. and Rivola, A.},
    					  title = {Condition Monitoring in Diesel Engines for Cold Test Applications. Part I: Vibration Analysis for Pass/Fail Decision},
    					  booktitle = {COMADEM 2007, International Congress on Condition Monitoring and Diagnostics Engineering Management, 13-15 June 2007, Faro, Portugal},
    					  year = {2007},
    					  pages = {197-206}
    					}
    					
    DelVecchio-2007b Del Vecchio, S. and Niculita, O. and Dalpiaz, G. and Rivola, A. Condition Monitoring in Diesel Engines for Cold Test Applications. Part II: Comparison of Vibration Analysis Techniques 2007 COMADEM 2007, International Congress on Condition Monitoring and Diagnostics Engineering Management, 13-15 June 2007, Faro, Portugal
    pp.207-216  
    conference
    BibTeX:
    					@conference{DelVecchio-2007b,
    					  author = {Del Vecchio, S. and Niculita, O. and Dalpiaz, G. and Rivola, A.},
    					  title = {Condition Monitoring in Diesel Engines for Cold Test Applications. Part II: Comparison of Vibration Analysis Techniques},
    					  booktitle = {COMADEM 2007, International Congress on Condition Monitoring and Diagnostics Engineering Management, 13-15 June 2007, Faro, Portugal},
    					  year = {2007},
    					  pages = {207-216}
    					}
    					
    Moreno-2007a Moreno, D. and Mucchi, E. and Dalpiaz, G. and Rivola, A. Multibody Analysis of the Desmodromic Valve Train of the Ducati MotoGP Engine 2007 ECCOMAS, Multibody Dynamics 2007, 25-28 June 2007, Milano, Italy
    pp.1-13  
    conference
    BibTeX:
    					@conference{Moreno-2007a,
    					  author = {Moreno, D. and Mucchi, E. and Dalpiaz, G. and Rivola, A.},
    					  title = {Multibody Analysis of the Desmodromic Valve Train of the Ducati MotoGP Engine},
    					  booktitle = {ECCOMAS, Multibody Dynamics 2007, 25-28 June 2007, Milano, Italy},
    					  year = {2007},
    					  pages = {1-13}
    					}
    					
    Mucchi-2007a Mucchi, E. and Rivola, A. Influence of Design and Operational Parameters on the Dynamic Behaviour of Gear Pumps 2007 ICSV14 - 14th International Congress on Sound and Vibration, 9-12 July 2007, Cairns, Australia
    Vol.2 pp.1619-1626 Scopus: 2-s2.0-84881458772  
    conference PDF
    Abstract: This work concerns external gear pumps for automotive applications,
    which operate at high speed and low pressure and presents a sensitivity
    analysis about the influence of design and operational parameters
    on the pump dynamic behaviour. In previous work, a non-linear lumped-parameter
    kineto-elastodynamic model was developed, with the aim of including
    all the important effects, as well as to get a rather simple model.
    Two main sources of noise and vibration can be considered: pressure
    variation and gear meshing. The model has been validated by comparison
    with experimental vibration data, in a wide range of operational
    conditions and for different gear designs and several profile errors.
    This paper is focused on the analysis of the influence of the main
    design and operational parameters on the pump dynamic behaviour.
    In particular, the effect of operational pressure and speed, the
    influence of the clearance in the journal bearing and between tooth
    tip and pump case, and the effect of the dimension of the relief
    grooves in the bushes will be thoroughly discussed in the paper.
    Finally, the model could be a very useful and powerful tool in order
    to evaluate design improvements for noise and vibration reduction.
    BibTeX:
    					@conference{Mucchi-2007a,
    					  author = {Mucchi, E. and Rivola, A.},
    					  title = {Influence of Design and Operational Parameters on the Dynamic Behaviour of Gear Pumps},
    					  booktitle = {ICSV14 - 14th International Congress on Sound and Vibration, 9-12 July 2007, Cairns, Australia},
    					  year = {2007},
    					  volume = {2},
    					  pages = {1619-1626},
    					  note = {Scopus: 2-s2.0-84881458772},
    					  url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84881458772&partnerID=40&md5=992de968c01e035f4729aa59bd67509d}
    					}
    					
    Mucchi-2007b Mucchi, E. and Rivola, A. Modellazione elastodinamica dell'albero a gomiti di un motore motociclistico Ducati (in Italian) 2007
    (152) Ph.D. Thesis at ENDIF, University of Ferrara Technical report by ENDIF, University of Ferrara  
    techreport
    BibTeX:
    					@techreport{Mucchi-2007b,
    					  author = {Mucchi, E. and Rivola, A.},
    					  title = {Modellazione elastodinamica dell'albero a gomiti di un motore motociclistico Ducati (in Italian)},
    					  school = {ENDIF, University of Ferrara},
    					  year = {2007},
    					  number = {152}
    					}
    					
    Mucchi-2007c Mucchi, E. and Rivola, A. Analisi modale sperimentale di un componente strutturale di macchina utensile (in Italian) 2007
    (154) Ph.D. Thesis at ENDIF, University of Ferrara Technical report by ENDIF, University of Ferrara  
    techreport
    BibTeX:
    					@techreport{Mucchi-2007c,
    					  author = {Mucchi, E. and Rivola, A.},
    					  title = {Analisi modale sperimentale di un componente strutturale di macchina utensile (in Italian)},
    					  school = {ENDIF, University of Ferrara},
    					  year = {2007},
    					  number = {154}
    					}
    					
    Mucchi-2007d Mucchi, E. and Rivola, A. Implementazione di un modello di rigidezza di ingranamento in ambiente Matlab (in Italian) 2007
    (156) Ph.D. Thesis at ENDIF, University of Ferrara Technical report by ENDIF, University of Ferrara  
    techreport
    BibTeX:
    					@techreport{Mucchi-2007d,
    					  author = {Mucchi, E. and Rivola, A.},
    					  title = {Implementazione di un modello di rigidezza di ingranamento in ambiente Matlab (in Italian)},
    					  school = {ENDIF, University of Ferrara},
    					  year = {2007},
    					  number = {156}
    					}
    					
    Rivola-2007a Rivola, A. Higher Order Spectral Analysis: a Tool for Fault Monitoring and Diagnostics 2007 Giornata di Studio in onore di Ettore Funaioli - 18 luglio 2007
    pp.203-215  
    incollection PDF
    BibTeX:
    					@incollection{Rivola-2007a,
    					  author = {Rivola, A.},
    					  title = {Higher Order Spectral Analysis: a Tool for Fault Monitoring and Diagnostics},
    					  booktitle = {Giornata di Studio in onore di Ettore Funaioli - 18 luglio 2007},
    					  publisher = {Asterisco},
    					  year = {2007},
    					  pages = {203-215},
    					  url = {http://amsacta.unibo.it/2460/},
    					  doi = {https://doi.org/10.6092/unibo/amsacta/2460}
    					}
    					
    Rivola-2007b Rivola, A. and Troncossi, M. and Dalpiaz, G. and Carlini, A. Elastodynamic analysis of the desmodromic valve train of a racing motorbike engine by means of a combined lumped/finite element model 2007 Mechanical Systems and Signal Processing
    Vol.21 (2) pp.735-760 Scopus: 2-s2.0-33750510896; WOS: 000242493200009  
    article PDF
    Abstract: A combined lumped/finite element model of a portion of the desmodromic
    valve train of a racing motorbike engine was developed and validated
    in order to simulate the elastodynamic behaviour of such a particular
    timing system. The model includes the lumped parameter model of the
    belt transmission that drives the camshafts, the finite element model
    of the camshafts, and the lumped parameter model of two cam-valve
    mechanisms (one for each camshaft). The procedure to validate the
    model, based on experimental tests carried out on a test bench described
    here, is presented and discussed. The comparison between the numerical
    results and the experimental data shows that the effectiveness of
    the model is satisfactorily achieved. It will be possible, in a further
    study, to add the other cam-valve mechanisms and the missing external
    forces, in order to obtain a complete system model. Some possible
    applications of the presented model are provided in order to show
    how the overall model could be employed to perform both design optimisation
    and diagnostics. &circledc; 2006 Elsevier Ltd. All rights reserved.
    BibTeX:
    					@article{Rivola-2007b,
    					  author = {Rivola, A. and Troncossi, M. and Dalpiaz, G. and Carlini, A.},
    					  title = {Elastodynamic analysis of the desmodromic valve train of a racing motorbike engine by means of a combined lumped/finite element model},
    					  journal = {Mechanical Systems and Signal Processing},
    					  year = {2007},
    					  volume = {21},
    					  number = {2},
    					  pages = {735-760},
    					  note = {Scopus: 2-s2.0-33750510896; WOS: 000242493200009},
    					  url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33750510896&partnerID=40&md5=0e7103cff8d9fd3a136c1c309d9a9e13},
    					  doi = {https://doi.org/10.1016/j.ymssp.2006.06.004}
    					}
    					
    Dalpiaz-2006a Dalpiaz, G. and D'Elia, G. and Mucchi, E. and Rivola, A. Vibro-acoustic measurements for the identification of incoming stall in axial compressor 2006 ISMA 2006 - International Conference on Modal Analysis Noise and Vibration Engineering, 18-20 September 2006, Leuven, Belgium
    Vol.6 pp.3593-3603 Scopus: 2-s2.0-84897048984; WOS: 000246669505042  
    conference PDF
    Abstract: This work addresses on a complete vibro-acoustic characterization
    of an axial compressor with the aim to foresee the rotor instability.
    The tests were performed on a turboshaft Allison 250-C18. The compressor
    is composed of six axial stages and one centrifugal stage. Four vibration
    signals were simultaneously measured by means of accelerometers,
    while the acoustic signals were measured by means of two microphones.
    Two different kinds of tests have been carried out on the compressor
    that operates at constant speed: in the course of the first test
    the six signals were acquired at different positions of the throttle
    opening, whereas during the second test, the signals were acquired
    while the throttle was gradually opened. The test results show a
    sensitive increase of the sub-synchronous activity in the accelerometers
    spectrum map, moreover, closing the throttle, the amplitude of the
    spectrum components increases. These phenomena can be related to
    the rotating stall behavior.
    BibTeX:
    					@conference{Dalpiaz-2006a,
    					  author = {Dalpiaz, G. and D'Elia, G. and Mucchi, E. and Rivola, A.},
    					  title = {Vibro-acoustic measurements for the identification of incoming stall in axial compressor},
    					  booktitle = {ISMA 2006 - International Conference on Modal Analysis Noise and Vibration Engineering, 18-20 September 2006, Leuven, Belgium},
    					  publisher = {Katholieke Universiteit Leuven},
    					  year = {2006},
    					  volume = {6},
    					  pages = {3593-3603},
    					  note = {Scopus: 2-s2.0-84897048984; WOS: 000246669505042},
    					  url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84897048984&partnerID=40&md5=4b32f6b6ae4ba2187aae5f05e70a86ae}
    					}
    					
    Rivola-2006a Rivola, A. and Milandri, M. and Mucchi, E. A Geartrain Model for the Dynamic Analysis of a Motorbike Timing System 2006 ISMA 2006 - International Conference on Modal Analysis Noise and Vibration Engineering, 18-20 September 2006, Leuven, Belgium
    Vol.5 pp.2689-2703 Scopus: 2-s2.0-84897095389; WOS: 000246669504020  
    conference PDF
    Abstract: This work deals with the elastodynamic model of the geartrain that
    drives the cam-valve mechanisms of a motorbike engine timing system.
    The gear torsional vibrations are simulated by means of a lumped
    parameter model which takes into account the parametric excitation
    due to the time-varying meshing stiffness, the tooth separation phenomenon
    and the lubricant squeeze effect between approaching teeth. In order
    to get insight into the dynamics of the timing system, and to help
    the development of the geartrain elastodynamic model, several experimental
    tests were carried out. The experimental procedures are here illustrated
    together with the signal processing techniques. The comparison between
    numerical results and experimental measurements shows that the effectiveness
    of the model is satisfactorily assessed. The model can predict and
    interpret the actual dynamic behaviour of the system; therefore,
    it can be used as a tool for the design optimisation of the motorbike
    timing system.
    BibTeX:
    					@conference{Rivola-2006a,
    					  author = {Rivola, A. and Milandri, M. and Mucchi, E.},
    					  title = {A Geartrain Model for the Dynamic Analysis of a Motorbike Timing System},
    					  booktitle = {ISMA 2006 - International Conference on Modal Analysis Noise and Vibration Engineering, 18-20 September 2006, Leuven, Belgium},
    					  publisher = {Katholieke Universiteit Leuven},
    					  year = {2006},
    					  volume = {5},
    					  pages = {2689-2703},
    					  note = {Scopus: 2-s2.0-84897095389; WOS: 000246669504020},
    					  url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84897095389&partnerID=40&md5=8f4218e20ce912016ef7537bd140bfde}
    					}
    					
    Dalpiaz-2005a Dalpiaz, G. and Mucchi, E. and Fernandez del Rincon, A. and Rivola, A. Experimental validation of a model for the dynamic analysis of gear pumps 2005 NOVEM 2005 - Noise and Vibration: Engineering Methods, 18-21 April 2005, Saint-Raphael, France
    pp.1-12  
    conference
    BibTeX:
    					@conference{Dalpiaz-2005a,
    					  author = {Dalpiaz, G. and Mucchi, E. and Fernandez del Rincon, A. and Rivola, A.},
    					  title = {Experimental validation of a model for the dynamic analysis of gear pumps},
    					  booktitle = {NOVEM 2005 - Noise and Vibration: Engineering Methods, 18-21 April 2005, Saint-Raphael, France},
    					  year = {2005},
    					  pages = {1-12}
    					}
    					
    Benni-2004a Benni, G. and Rivola, A. and Dalpiaz, G. and Mucchi, E. A Non Linear Model of the Geartrain of the Timing System of the Ducati Racing Motorbike 2004 5th International Conference on Acoustical and Vibratory Surveillance Methods and Diagnostic Techniques, 11-13 October 2004, Senlis, France
    pp.1-10  
    conference
    BibTeX:
    					@conference{Benni-2004a,
    					  author = {Benni, G. and Rivola, A. and Dalpiaz, G. and Mucchi, E.},
    					  title = {A Non Linear Model of the Geartrain of the Timing System of the Ducati Racing Motorbike},
    					  booktitle = {5th International Conference on Acoustical and Vibratory Surveillance Methods and Diagnostic Techniques, 11-13 October 2004, Senlis, France},
    					  year = {2004},
    					  pages = {1-10}
    					}
    					
    Dalpiaz-2004a Dalpiaz, G. and Fernandez del Rincon, A. and Mucchi, E. and Rivola, A. Model-based Analysis of Dynamic Phenomena in Gear Pumps 2004 5th International Conference on Acoustical and Vibratory Surveillance Methods and Diagnostic Techniques, 11-13 October 2004, Senlis, France
    pp.1-11  
    conference
    BibTeX:
    					@conference{Dalpiaz-2004a,
    					  author = {Dalpiaz, G. and Fernandez del Rincon, A. and Mucchi, E. and Rivola, A.},
    					  title = {Model-based Analysis of Dynamic Phenomena in Gear Pumps},
    					  booktitle = {5th International Conference on Acoustical and Vibratory Surveillance Methods and Diagnostic Techniques, 11-13 October 2004, Senlis, France},
    					  year = {2004},
    					  pages = {1-11}
    					}
    					
    Rivola-2004a Rivola, A. and Carlini, A. A camshaft non-linear model for the desmodromic valve train simulation 2004 ISMA 2004 - International Conference on Modal Analysis Noise and Vibration Engineering, 20-22 September 2004, Leuven, Belgium
    pp.2051-2065 Scopus: 2-s2.0-13344259955; WOS: 000239814904004  
    conference PDF
    Abstract: In this paper the dynamic behaviour of the desmodromic valve train
    of a motorbike engine is simulated and analysed. The valve train
    model takes into account the mass distribution, the link elastic
    flexibility, and the presence of several non-linearities. The camshafts,
    which are supported by hydrodynamic journal bearings, are modelled
    by means of finite rotating elements based on Timoshenko beams with
    the effect of gyroscopic moment. The non-linear bearing forces are
    analytically obtained under the finite-length bearing assumption.
    The comparison between the numerical results and the experimental
    data - in terms of valve acceleration and camshaft angular velocity
    - shows that the effectiveness of the model is satisfactorily assessed.
    The paper mainly focuses on two points: the validation procedure
    of the finite element model of the camshafts, and the study of the
    simulated camshaft centreline trajectories.
    BibTeX:
    					@conference{Rivola-2004a,
    					  author = {Rivola, A. and Carlini, A.},
    					  title = {A camshaft non-linear model for the desmodromic valve train simulation},
    					  booktitle = {ISMA 2004 - International Conference on Modal Analysis Noise and Vibration Engineering, 20-22 September 2004, Leuven, Belgium},
    					  year = {2004},
    					  pages = {2051-2065},
    					  note = {Scopus: 2-s2.0-13344259955; WOS: 000239814904004},
    					  url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-13344259955&partnerID=40&md5=519e03bdee22c2d8aba10d94753c53b9}
    					}
    					
    Carlini-2003a Carlini, A. and Rivola, A. A non linear elastodynamic model of a camshaft supported by journal bearings 2003 16th AIMETA Congress of Theoretical and Applied Mechanics, 9-12 September 2003, Ferrara, Italy
    pp.1-12  
    conference
    BibTeX:
    					@conference{Carlini-2003a,
    					  author = {Carlini, A. and Rivola, A.},
    					  title = {A non linear elastodynamic model of a camshaft supported by journal bearings},
    					  booktitle = {16th AIMETA Congress of Theoretical and Applied Mechanics, 9-12 September 2003, Ferrara, Italy},
    					  year = {2003},
    					  pages = {1-12}
    					}
    					
    Rivola-2003a Rivola, A. and Carlini, A. Sistema per l'acquisizione di segnali analogici e digitali su un banco prova di testate motociclistiche Ducati 2003 Proceedings of Automotive Day 2003, 12 June 2003, CRF - Orbassano (TO), Italy
    pp.55-58  
    conference
    BibTeX:
    					@conference{Rivola-2003a,
    					  author = {Rivola, A. and Carlini, A.},
    					  title = {Sistema per l'acquisizione di segnali analogici e digitali su un banco prova di testate motociclistiche Ducati},
    					  booktitle = {Proceedings of Automotive Day 2003, 12 June 2003, CRF - Orbassano (TO), Italy},
    					  year = {2003},
    					  pages = {55-58}
    					}
    					
    Carlini-2002a Carlini, A. and Rivola, A. and Dalpiaz, G. and Maggiore, A. Valve motion measurements on motorbike cylinder heads using high speed laser vibrometer 2002 Proceedings of SPIE - The International Society for Optical Engineering
    Vol.4827 pp.564-574 Scopus: 2-s2.0-0036421530; WOS: 000177818100061  
    conference PDF
    Abstract: This work deals with valve motion measurements on cylinder heads of
    Ducati racing motorbikes, by means of high speed laser Doppler vibrometer.
    The experimental apparatus is described and some measurement results
    are presented. The results confirm that the effects of the dynamic
    phenomena are very important, especially at high speeds, and that
    the dynamic response gets worse with the increment of backlashes
    in the cam kinematic pairs. In addition, the measurements make it
    possible to analyse the valve bumping phenomena. The information
    retrieved from measurements provides insight into the cam system
    dynamics and helps the development of elastodynamic predictive models.
    BibTeX:
    					@conference{Carlini-2002a,
    					  author = {Carlini, A. and Rivola, A. and Dalpiaz, G. and Maggiore, A.},
    					  title = {Valve motion measurements on motorbike cylinder heads using high speed laser vibrometer},
    					  booktitle = {Proceedings of SPIE - The International Society for Optical Engineering},
    					  year = {2002},
    					  volume = {4827},
    					  pages = {564-574},
    					  note = {Scopus: 2-s2.0-0036421530; WOS: 000177818100061},
    					  url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0036421530&partnerID=40&md5=c002d746b87f2ccbda22c017f558e1ea},
    					  doi = {https://doi.org/10.1117/12.468175}
    					}
    					
    Rivola-2002a Rivola, A. and Carlini, A. and Dalpiaz, G. Modelling the elastodynamic behaviour of a desmodromic valve train 2002 ISMA 2002 - International Conference on Noise and Vibration Engineering, 16-18 September 2002, Leuven, Belgium
    pp.1417-1426 Scopus: 2-s2.0-13344294415; WOS: 000227011500157  
    conference PDF
    Abstract: This paper deals with a lumped-parameter model of a motorbike engine's
    desmodromic valve train. The model of such an uncommon cam system
    is developed and validated with the aid of experimental measurements
    carried out on a test bench which operates the cam mechanism by means
    of an electrically powered driveline. The model describes the mechanical
    system taking into account the mass distribution, the link elastic
    flexibility, and the presence of several non-linearities. The model
    parameter estimation is discussed and the effectiveness of the model
    is assessed by a comparison with experimental results. In addition,
    the model is employed to estimate the magnitude of contact forces
    and to predict the system behaviour as a consequence of changes in
    some design parameters; therefore, it may be used as a tool both
    in design optimisation and diagnostics.
    BibTeX:
    					@conference{Rivola-2002a,
    					  author = {Rivola, A. and Carlini, A. and Dalpiaz, G.},
    					  title = {Modelling the elastodynamic behaviour of a desmodromic valve train},
    					  booktitle = {ISMA 2002 - International Conference on Noise and Vibration Engineering, 16-18 September 2002, Leuven, Belgium},
    					  year = {2002},
    					  pages = {1417-1426},
    					  note = {Scopus: 2-s2.0-13344294415; WOS: 000227011500157},
    					  url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-13344294415&partnerID=40&md5=549d97aba4984ca481eb6e36c158a5ee}
    					}
    					
    Dalpiaz-2001a Dalpiaz, G. and Rivola, A. Use of Inverse-Filtering for Gear Diagnostics 2001 Proceedings of the 4th International Conference on Acoustical and Vibratory Surveillance Methods and Diagnostic Techniques, 16-18 October 2001, Compiègne, France
    Vol.2 pp.379-391  
    conference
    BibTeX:
    					@conference{Dalpiaz-2001a,
    					  author = {Dalpiaz, G. and Rivola, A.},
    					  title = {Use of Inverse-Filtering for Gear Diagnostics},
    					  booktitle = {Proceedings of the 4th International Conference on Acoustical and Vibratory Surveillance Methods and Diagnostic Techniques, 16-18 October 2001, Compiègne, France},
    					  year = {2001},
    					  volume = {2},
    					  pages = {379-391}
    					}
    					
    Dalpiaz-2000a Dalpiaz, G. and Giuliani, G. and Rivola, A. Impiego di simulink per la simulazione del comportamento dinamico di azionamenti meccanici 2000 Proceedings of MATLAB Conference 2000, 8-9 February 2000, Bologna, Italy
     
    conference
    BibTeX:
    					@conference{Dalpiaz-2000a,
    					  author = {Dalpiaz, G. and Giuliani, G. and Rivola, A.},
    					  title = {Impiego di simulink per la simulazione del comportamento dinamico di azionamenti meccanici},
    					  booktitle = {Proceedings of MATLAB Conference 2000, 8-9 February 2000, Bologna, Italy},
    					  year = {2000}
    					}
    					
    Dalpiaz-2000b Dalpiaz, G. and Rivola, A. A non-linear elastodynamic model of a desmodromic valve train 2000 Mechanism and Machine Theory
    Vol.35 (11) pp.1551-1562 Scopus: 2-s2.0-0034325961; WOS: 000090135900004  
    article PDF
    Abstract: A lumped-parameter model of a motorbike engine's desmodromic valve
    train is developed for the simulation of the dynamic behaviour of
    such an uncommon train. The model takes into account several non-linear
    effects and is highly time-varying. The estimation of the model parameters
    is discussed and the effectiveness of the model is assessed by a
    comparison with experimental results. The model is employed to predict
    the magnitude of forces, impacts and bounces, and to detect unacceptable
    dynamic phenomena; thus, it may be used as a tool both in design
    optimization and diagnostics. (C) 2000 Elsevier Science Ltd. All
    rights reserved.
    BibTeX:
    					@article{Dalpiaz-2000b,
    					  author = {Dalpiaz, G. and Rivola, A.},
    					  title = {A non-linear elastodynamic model of a desmodromic valve train},
    					  journal = {Mechanism and Machine Theory},
    					  publisher = {Pergamon-elsevier Science Ltd},
    					  year = {2000},
    					  volume = {35},
    					  number = {11},
    					  pages = {1551-1562},
    					  note = {Scopus: 2-s2.0-0034325961; WOS: 000090135900004},
    					  url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0034325961&partnerID=40&md5=acd481482584908e08e7dfcaa8da79f3},
    					  doi = {https://doi.org/10.1016/S0094-114X(00)00012-4}
    					}
    					
    Dalpiaz-2000c Dalpiaz, G. and Rivola, A. Inverse Problems in Mechanisms for Packaging Machines 2000 Seventh International Conference on Recent Advances in Structural Dynamics, 24-27 July 2000, University of Southampton, Southampton, UK
    Vol.1 pp.159-172 WOS: 000166796300011  
    conference
    BibTeX:
    					@conference{Dalpiaz-2000c,
    					  author = {Dalpiaz, G. and Rivola, A.},
    					  title = {Inverse Problems in Mechanisms for Packaging Machines},
    					  booktitle = {Seventh International Conference on Recent Advances in Structural Dynamics, 24-27 July 2000, University of Southampton, Southampton, UK},
    					  year = {2000},
    					  volume = {1},
    					  pages = {159-172},
    					  note = {WOS: 000166796300011}
    					}
    					
    Dalpiaz-2000d Dalpiaz, G. and Rivola, A. and Rubini, R. Effectiveness and sensitivity of vibration processing techniques for local fault detection in gears 2000 Mechanical Systems and Signal Processing
    Vol.14 (3) pp.387-412 Scopus: 2-s2.0-0034188296; WOS: 000086756500007  
    article PDF
    Abstract: This paper deals with gear condition monitoring based on vibration
    analysis techniques. The detection and diagnostic capability of some
    of the most effective techniques are discussed and compared on the
    basis of experimental results, concerning a gear pair affected by
    a fatigue crack. In particular, the results of new approaches based
    on time-frequency and cyclostationarity analysis are compared against
    those obtained by means of the well-accepted cepstrum analysis and
    time-synchronous average analysis. Moreover, the sensitivity to fault
    severity is assessed by considering two different depths of the crack.
    The effect of transducer location and processing options are also
    shown. In the case of the experimental results considered in this
    paper, the power cepstrum is practically insensitive to the crack
    evolution. Conversely, the spectral correlation density function
    is able to monitor the fault development and does not seem to be
    significantly influenced by the transducer position. Analysis techniques
    of the time-synchronous average, such as the 'residual' signal and
    the demodulation technique, are able to localise the damaged tooth;
    however, the sensitivity of the demodulation technique is strongly
    dependent on the proper choice of the filtering band and affected
    by the transducer location. The wavelet transform seems to be a good
    tool for crack detection; it is particularly effective if the residual
    part of the time-synchronous averaged signal is processed.
    BibTeX:
    					@article{Dalpiaz-2000d,
    					  author = {Dalpiaz, G. and Rivola, A. and Rubini, R.},
    					  title = {Effectiveness and sensitivity of vibration processing techniques for local fault detection in gears},
    					  journal = {Mechanical Systems and Signal Processing},
    					  publisher = {Academic Press Ltd, London, United Kingdom},
    					  year = {2000},
    					  volume = {14},
    					  number = {3},
    					  pages = {387-412},
    					  note = {Scopus: 2-s2.0-0034188296; WOS: 000086756500007},
    					  url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0034188296&partnerID=40&md5=6c6fa11c6fa9c0e98772c4a010452dfe},
    					  doi = {https://doi.org/10.1006/mssp.1999.1294}
    					}
    					
    Rivola-2000a Rivola, A. Applications of higher order spectra to the machine condition monitoring 2000
    (107) Ph.D. Thesis at DIEM, University of Bologna Technical report by DIEM, University of Bologna  
    techreport
    BibTeX:
    					@techreport{Rivola-2000a,
    					  author = {Rivola, A.},
    					  title = {Applications of higher order spectra to the machine condition monitoring},
    					  school = {DIEM, University of Bologna},
    					  year = {2000},
    					  number = {107}
    					}
    					
    Rivola-2000b Rivola, A. Comparison Between Second and Higher Order Spectral Analysis in Detecting Structural Damages 2000 Seventh International Conference on Recent Advances in Structural Dynamics, 24-27 July 2000, University of Southampton, Southampton, UK
    Vol.2 pp.937-950 WOS: 000166796300070  
    conference
    BibTeX:
    					@conference{Rivola-2000b,
    					  author = {Rivola, A.},
    					  title = {Comparison Between Second and Higher Order Spectral Analysis in Detecting Structural Damages},
    					  booktitle = {Seventh International Conference on Recent Advances in Structural Dynamics, 24-27 July 2000, University of Southampton, Southampton, UK},
    					  year = {2000},
    					  volume = {2},
    					  pages = {937-950},
    					  note = {WOS: 000166796300070}
    					}
    					
    Dalpiaz-1999a Dalpiaz, G. and Giuliani, G. and Rivola, A. Simulazione del comportamento dinamico degli assi di una macchina utensile 1999 Proceedings of 14th Italian Conference on Theoretical and Applied Mechanics - AIMETA '99, 6-9 October 1999, Como, Italy
    pp.1-12  
    conference
    BibTeX:
    					@conference{Dalpiaz-1999a,
    					  author = {Dalpiaz, G. and Giuliani, G. and Rivola, A.},
    					  title = {Simulazione del comportamento dinamico degli assi di una macchina utensile},
    					  booktitle = {Proceedings of 14th Italian Conference on Theoretical and Applied Mechanics - AIMETA '99, 6-9 October 1999, Como, Italy},
    					  year = {1999},
    					  pages = {1-12}
    					}
    					
    Dalpiaz-1999b Dalpiaz, G. and Rivola, A. A model for the elastodynamic analysis of a desmodromic valve train 1999 Proceedings of the Tenth World Congress on the Theory of Machines and Mechanisms, 20-24 June 1999, Oulu, Finland
    pp.1534-1542  
    conference
    BibTeX:
    					@conference{Dalpiaz-1999b,
    					  author = {Dalpiaz, G. and Rivola, A.},
    					  title = {A model for the elastodynamic analysis of a desmodromic valve train},
    					  booktitle = {Proceedings of the Tenth World Congress on the Theory of Machines and Mechanisms, 20-24 June 1999, Oulu, Finland},
    					  publisher = {Oulu University Press},
    					  year = {1999},
    					  pages = {1534-1542}
    					}
    					
    Rivola-1999a Rivola, A. and White, P.R. Detecting system non-linearities by means of higher order statistics 1999 REVUE FRANCAISE DE MECANIQUE
    Vol.2 pp.129-136  
    article
    Abstract: In the field of machine condition monitoring one can observe that
    there exists a link between machine vibrations and its health condition.
    Machine faults are often related to non-linearities occurring in
    the machine itself. This paper concerns the detection of non-linearities
    in mechanical systems by means of diagnostic techniques based on
    Higher Order Spectra (HOS). Since HOS give information about a signal's
    non-Gaussianity, assuming the signal as an output of a system with
    a Gaussian input, then HOS allow one to provide information related
    to the non-linearity within the system. A simple model is used with
    the aim of showing the effectiveness of the normalised version of
    polyspectra in detecting different kinds of system non-linearities.
    In addition, HOS are used to interpret the signal structure and the
    system's physical characteristics.
    BibTeX:
    					@article{Rivola-1999a,
    					  author = {Rivola, A. and White, P. R.},
    					  title = {Detecting system non-linearities by means of higher order statistics},
    					  journal = {REVUE FRANCAISE DE MECANIQUE},
    					  publisher = {Société Fran¸ caise des Mécaniciens, Courbevoie},
    					  year = {1999},
    					  volume = {2},
    					  pages = {129-136}
    					}
    					
    Rivola-1999b Rivola, A. and White, P.R. Use of higher order spectra in condition monitoring: Simulation and experiments 1999 Proceedings of ASME Design Engineering Technical Conferences, 12-16 September 1999, Las Vegas, Nevada
    Vol.DETC99/VIB-8332 pp.1-12  
    conference
    BibTeX:
    					@conference{Rivola-1999b,
    					  author = {Rivola, A. and White, Paul R.},
    					  title = {Use of higher order spectra in condition monitoring: Simulation and experiments},
    					  booktitle = {Proceedings of ASME Design Engineering Technical Conferences, 12-16 September 1999, Las Vegas, Nevada},
    					  year = {1999},
    					  volume = {DETC99/VIB-8332},
    					  pages = {1-12}
    					}
    					
    Dalpiaz-1998a Dalpiaz, G. and Rivola, A. and Rubini, R. Gear fault monitoring: Comparison of vibration analysis techniques 1998 Proceedings of the 3rd International Conference on Acoustical and Vibratory Surveillance Methods and Diagnostic Techniques, 13-15 October 1998, Senlis, France
    Vol.2 pp.623-637  
    conference
    BibTeX:
    					@conference{Dalpiaz-1998a,
    					  author = {Dalpiaz, G. and Rivola, A. and Rubini, R.},
    					  title = {Gear fault monitoring: Comparison of vibration analysis techniques},
    					  booktitle = {Proceedings of the 3rd International Conference on Acoustical and Vibratory Surveillance Methods and Diagnostic Techniques, 13-15 October 1998, Senlis, France},
    					  publisher = {Société Fran¸ caise des Mécaniciens, Courbevoie},
    					  year = {1998},
    					  volume = {2},
    					  pages = {623-637}
    					}
    					
    Rivola-1998a Rivola, A. and White, P.R. Detecting system non-linearities by means of higher order statistics 1998 Proceedings of the 3rd International Conference on Acoustical and Vibratory Surveillance Methods and Diagnostic Techniques, 13-15 October 1998, Senlis, France
    Vol.1 pp.263-272  
    conference
    Abstract: In the field of machine condition monitoring one can observe that
    there exists a link between machine vibrations and its health condition.
    Machine faults are often related to non-linearities occurring in
    the machine itself. This paper concerns the detection of non-linearities
    in mechanical systems by means of diagnostic techniques based on
    Higher Order Spectra (HOS). Since HOS give information about a signal's
    non-Gaussianity, assuming the signal as an output of a system with
    a Gaussian input, then HOS allow one to provide information related
    to the non-linearity within the system. A simple model is used with
    the aim of showing the effectiveness of the normalised version of
    polyspectra in detecting different kinds of system non-linearities.
    In addition, HOS are used to interpret the signal structure and the
    system's physical characteristics.
    BibTeX:
    					@conference{Rivola-1998a,
    					  author = {Rivola, A. and White, P. R.},
    					  title = {Detecting system non-linearities by means of higher order statistics},
    					  booktitle = {Proceedings of the 3rd International Conference on Acoustical and Vibratory Surveillance Methods and Diagnostic Techniques, 13-15 October 1998, Senlis, France},
    					  publisher = {Société Fran¸ caise des Mécaniciens, Courbevoie},
    					  year = {1998},
    					  volume = {1},
    					  pages = {263-272}
    					}
    					
    Rivola-1998b Rivola, A. and White, P.R. Bispectral analysis of the bilinear oscillator with application to the detection of fatigue cracks 1998 Journal of Sound and Vibration
    Vol.216 (5) pp.889-910 Scopus: 2-s2.0-0032497443; WOS: 000076354200007  
    article PDF
    Abstract: Damage detection by means of non-destructive testing plays an important
    role in ensuring the integrity of machine elements and structures.
    Vibration testing is an effective means of detecting crack development
    in structures. In this paper the effect of crack closure on the dynamic
    behaviour of cantilever beams is studied. Since the crack opens or
    closes depending on the direction of the vibration, the beam exhibits
    bilinear characteristics. The aim of the paper is to analyze the
    system response by using bispectral analysis which forms a subset
    of higher order statistical analysis. The study has been conducted
    both on simulated and experimental vibration signals. Firstly, a
    simplified model is employed to simulate the bilinear behaviour of
    a beam with a closing crack. The model is an oscillator with a bilinear
    restoring forcing function. The analysis of the forced vibrations
    of the model is performed by means of the harmonic balance method
    showing the occurrence of harmonics in the response spectrum which
    are strictly related to the bilinear nature of the model. Moreover,
    an experimental test carried out on a straight beam with a fatigue
    crack is presented. The beam is excited with white noise by means
    of a vibration shaker. The bispectral analysis performed both on
    the model and the actual structure shows high sensitivity to the
    non-linear behaviour of the system: that is to say, to the presence
    of the fatigue crack in the structure. In particular, the interactions
    between the frequency components contained in the signal response
    are analyzed. The results provide a possibility of using the bispectral
    analysis technique to detect damages in structures. (C) 1998 Academic
    Press.
    BibTeX:
    					@article{Rivola-1998b,
    					  author = {Rivola, A. and White, P. R.},
    					  title = {Bispectral analysis of the bilinear oscillator with application to the detection of fatigue cracks},
    					  journal = {Journal of Sound and Vibration},
    					  publisher = {Academic Press Ltd},
    					  year = {1998},
    					  volume = {216},
    					  number = {5},
    					  pages = {889-910},
    					  note = {Scopus: 2-s2.0-0032497443; WOS: 000076354200007},
    					  url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0032497443&partnerID=40&md5=4ebd5bb52f4334cf1fe24f04e0594caf},
    					  doi = {https://doi.org/10.1006/jsvi.1998.1738}
    					}
    					
    Amabili-1997a Amabili, M. and Rivola, A. Dynamic analysis of spur gear pairs: Steady-state response and stability of the SDOF model with time-varying meshing damping 1997 Mechanical Systems and Signal Processing
    Vol.11 (3) pp.375-390 Scopus: 2-s2.0-0031139584; WOS: A1997XA49800003  
    article PDF
    Abstract: The steady-state response and stability of the single degree of freedom
    (sdof) model of a pair of low contact ratio spur gears are studied.
    In the proposed model, a time-varying stiffness of the meshing tooth
    pairs and a viscous damping proportional to the meshing stiffness
    are considered. Gear errors of each meshing tooth pair are also included.
    A continuous closed-form solution was obtained for any rotational
    speed where there is no tooth separation. Transition curves separating
    stable and unstable regions are computed by Hill infinite determinant;
    different meshing stiffness are considered and the influence of both
    damping and contact ratios are investigated. One of the advantages
    of the technique used is the speed and accuracy of the computation
    of the responses and transition curves. Results obtained by the numerical
    simulation of the steady-state responses of two different pairs of
    spur gears are satisfactorily compared to experimental results. &circledc;
    1997 Academic Press Limited.
    BibTeX:
    					@article{Amabili-1997a,
    					  author = {Amabili, M. and Rivola, A.},
    					  title = {Dynamic analysis of spur gear pairs: Steady-state response and stability of the SDOF model with time-varying meshing damping},
    					  journal = {Mechanical Systems and Signal Processing},
    					  year = {1997},
    					  volume = {11},
    					  number = {3},
    					  pages = {375-390},
    					  note = {Scopus: 2-s2.0-0031139584; WOS: A1997XA49800003},
    					  url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0031139584&partnerID=40&md5=90ede68d9c0ecef302b64cca8f298e42}
    					}
    					
    Dalpiaz-1997a Dalpiaz, G. and Rivola, A. Condition monitoring and diagnostics in automatic machines: Comparison of vibration analysis techniques 1997 Mechanical Systems and Signal Processing
    Vol.11 (1) pp.53-73 Scopus: 2-s2.0-0030737011; WOS: A1997WF15100006  
    article PDF
    Abstract: This paper assesses and compares the effectiveness and reliability
    of different vibration analysis techniques for fault detection and
    diagnostics in cam mechanisms used in high performance automatic
    packaging machines. Firstly, the results of the application of widely
    used techniques are given and their limitations are delineated. Secondly,
    the application of the wavelet transform is proposed, since the vibrations
    of this kind of machine are highly non-stationary. Finally, an inverse-filtering
    technique is used to recover the actual output link motion from the
    casing vibration, in order to enable condition monitoring and diagnostics
    to be carried out through the analysis of the mechanism motion. &circledc;
    1997 Academic Press Limited.
    BibTeX:
    					@article{Dalpiaz-1997a,
    					  author = {Dalpiaz, G. and Rivola, A.},
    					  title = {Condition monitoring and diagnostics in automatic machines: Comparison of vibration analysis techniques},
    					  journal = {Mechanical Systems and Signal Processing},
    					  year = {1997},
    					  volume = {11},
    					  number = {1},
    					  pages = {53-73},
    					  note = {Scopus: 2-s2.0-0030737011; WOS: A1997WF15100006},
    					  url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0030737011&partnerID=40&md5=6d3d0ece63ea53d562a92a5e0c0a50a8},
    					  doi = {https://doi.org/10.1006/mssp.1996.0067}
    					}
    					
    Dalpiaz-1997b Dalpiaz, G. and Rivola, A. and Rubini, R. A Kineto-Elastodynamic Model of a Gear Testing Machine 1997 Proceedings of International Conference on Mechanical Transmissions and Mechanisms, MTM'97, 1-4 July 1997, Tianjin, China
    pp.549-553  
    conference
    BibTeX:
    					@conference{Dalpiaz-1997b,
    					  author = {Dalpiaz, G. and Rivola, A. and Rubini, R.},
    					  title = {A Kineto-Elastodynamic Model of a Gear Testing Machine},
    					  booktitle = {Proceedings of International Conference on Mechanical Transmissions and Mechanisms, MTM'97, 1-4 July 1997, Tianjin, China},
    					  publisher = {China Machine Press, Beijing},
    					  year = {1997},
    					  pages = {549-553}
    					}
    					
    Rivola-1997a Rivola, A. Crack Detection by Bispectral Analysis 1997 XIII Congresso Nazionale Associazione Italiana di Meccanica Teorica ed Applicata - AIMETA'97, 29 September-3 October 1997, Siena, Italy
    Vol.2 pp.73-80  
    conference
    BibTeX:
    					@conference{Rivola-1997a,
    					  author = {Rivola, A.},
    					  title = {Crack Detection by Bispectral Analysis},
    					  booktitle = {XIII Congresso Nazionale Associazione Italiana di Meccanica Teorica ed Applicata - AIMETA'97, 29 September-3 October 1997, Siena, Italy},
    					  publisher = {ETS, Pisa, Italia},
    					  year = {1997},
    					  volume = {2},
    					  pages = {73-80}
    					}
    					
    Dalpiaz-1996a Dalpiaz, G. and Rivola, A. and Rubini, R. Dynamic modelling of gear systems for condition monitoring and diagnostics 1996 Proceedings of the Congress of Technical Diagnostics, KDT '96, Gdansk, Poland
    Vol.2 pp.185-192  
    conference
    BibTeX:
    					@conference{Dalpiaz-1996a,
    					  author = {Dalpiaz, G. and Rivola, A. and Rubini, R.},
    					  title = {Dynamic modelling of gear systems for condition monitoring and diagnostics},
    					  booktitle = {Proceedings of the Congress of Technical Diagnostics, KDT '96, Gdansk, Poland},
    					  year = {1996},
    					  volume = {2},
    					  pages = {185-192}
    					}
    					
    Rivola-1996a Rivola, A. and Meneghetti, U. Misurazione accurata di frequenze 1996 Scritti per Ettore Funaioli - Progetto Leonardo
    pp.225-236  
    incollection
    BibTeX:
    					@incollection{Rivola-1996a,
    					  author = {Rivola, A. and Meneghetti, U.},
    					  title = {Misurazione accurata di frequenze},
    					  booktitle = {Scritti per Ettore Funaioli - Progetto Leonardo},
    					  publisher = {Società Editrice Esculapio},
    					  year = {1996},
    					  pages = {225-236}
    					}
    					
    Dalpiaz-1995a Dalpiaz, G. and Rivola, A. A kineto-elastodynamic model of a mechanism for automatic machine 1995 Proceedings of the Ninth World Congress on the Theory of Machines and Mechanisms
    Vol.1 pp.327-332  
    conference
    BibTeX:
    					@conference{Dalpiaz-1995a,
    					  author = {Dalpiaz, G. and Rivola, A.},
    					  title = {A kineto-elastodynamic model of a mechanism for automatic machine},
    					  booktitle = {Proceedings of the Ninth World Congress on the Theory of Machines and Mechanisms},
    					  year = {1995},
    					  volume = {1},
    					  pages = {327-332}
    					}
    					
    Dalpiaz-1995b Dalpiaz, G. and Rivola, A. Fault Detection and Diagnostics in Cam Mechanisms 1995 Proc. 2nd Int. Symp. Acoustical and Vibratory Surveillance Methods and Diagnostic Techniques, Paris, France
    Vol.1 pp.327-338  
    conference
    BibTeX:
    					@conference{Dalpiaz-1995b,
    					  author = {Dalpiaz, G. and Rivola, A.},
    					  title = {Fault Detection and Diagnostics in Cam Mechanisms},
    					  booktitle = {Proc. 2nd Int. Symp. Acoustical and Vibratory Surveillance Methods and Diagnostic Techniques, Paris, France},
    					  year = {1995},
    					  volume = {1},
    					  pages = {327-338}
    					}
    					
    Meneghetti-1995a Meneghetti, U. and Rivola, A. Crack localization by sensitivity analysis and accurate frequency measurement 1995 International Workshop on Structural Damage Assessment Using Advanced Signal Processing Procedures
     
    conference
    BibTeX:
    					@conference{Meneghetti-1995a,
    					  author = {Meneghetti, U. and Rivola, A.},
    					  title = {Crack localization by sensitivity analysis and accurate frequency measurement},
    					  booktitle = {International Workshop on Structural Damage Assessment Using Advanced Signal Processing Procedures},
    					  year = {1995}
    					}
    					
    Dalpiaz-1994a Dalpiaz, G. and Rivola, A. and Meneghetti, U. Use of Filtering Function for Machine Health Monitoring 1994 Condition monitoring'94: proceedings of an International conference on Condition monitoring held at University of Wales, 21st-25th March 1994, Swansea, UK
    pp.217-228 WOS: A1994BD72D00021  
    conference
    BibTeX:
    					@conference{Dalpiaz-1994a,
    					  author = {Dalpiaz, G. and Rivola, A. and Meneghetti, U.},
    					  title = {Use of Filtering Function for Machine Health Monitoring},
    					  booktitle = {Condition monitoring'94: proceedings of an International conference on Condition monitoring held at University of Wales, 21st-25th March 1994, Swansea, UK},
    					  publisher = {Pineridge Press},
    					  year = {1994},
    					  pages = {217-228},
    					  note = {WOS: A1994BD72D00021}
    					}
    					
    Rivola-1993a Rivola, A. and Dalpiaz, G. Analisi dinamica di un meccanismo per macchina automatica 1993
    (76) Ph.D. Thesis at DIEM, University of Bologna Technical report by DIEM, University of Bologna  
    techreport
    BibTeX:
    					@techreport{Rivola-1993a,
    					  author = {Rivola, A. and Dalpiaz, G.},
    					  title = {Analisi dinamica di un meccanismo per macchina automatica},
    					  school = {DIEM, University of Bologna},
    					  year = {1993},
    					  number = {76}
    					}
    					

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