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Start Over Descriptor "impulse methods" Topic 02 engineering and technology
2 results on '"impulse methods"'

1. Frictionless multiple impacts in multibody systems. II. Numerical algorithm and simulation results

Author

Zhen Zhao, Caishan Liu, Bernard Brogliato, College of Engineering [Beijing], Peking University [Beijing], State Key Laboratory for Turbulence and Complex Systems [Beijing], Modelling, Simulation, Control and Optimization of Non-Smooth Dynamical Systems (BIPOP), Inria Grenoble - Rhône-Alpes, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Laboratoire Jean Kuntzmann (LJK), Université Pierre Mendès France - Grenoble 2 (UPMF)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Pierre Mendès France - Grenoble 2 (UPMF)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Laboratoire Jean Kuntzmann (LJK), Université Pierre Mendès France - Grenoble 2 (UPMF)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Pierre Mendès France - Grenoble 2 (UPMF)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)-Inria Grenoble - Rhône-Alpes, and Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)

Subjects
Discretization, Differential equation, General Mathematics, General Engineering, General Physics and Astronomy, [PHYS.MECA]Physics [physics]/Mechanics [physics], 02 engineering and technology, Impulse (physics), impulse methods, 01 natural sciences, Potential energy, Bernoulli's principle, 020303 mechanical engineering & transports, 0203 mechanical engineering, Ordinary differential equation, 0103 physical sciences, Darboux-Keller's dynamics, 010301 acoustics, Algorithm, stiff problem, Mathematics
Abstract

International audience; Part I of this paper develops a framework that is an extension of the Darboux-Keller shock dynamics towards frictionless multiple impacts between bodies composed of rateindependent materials. A numerical algorithm is proposed in this paper, in which the impulsive differential equation is discretized with respect to the primary impulse corresponding to the contact with the highest potential energy, and the integration step size is estimated at the momentum level. This algorithm respects the energetic constraints and avoids the stiff ordinary differential equation problem arising by directly using the compliant model. The well-known example of Newton's cradle, as well as Bernoulli's system, is used to illustrate the developments.

Published
2008
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2. Study of vibratory behavior of interconnected porous PZT by impulse method

Author

Gilbert Fantozzi, T. Aouaroun, A. Ayadi, K. Boumchedda, Unité de Recherche : Matériaux, procédés et Environement ( UR:MPE ), Université M'Hamed Bougara Boumerdes, Centre d'études et de recherches appliquées à la gestion ( CERAG ), Université Pierre Mendès France - Grenoble 2 ( UPMF ) -Centre National de la Recherche Scientifique ( CNRS ), Matériaux, ingénierie et science [Villeurbanne] ( MATEIS ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique ( CNRS ) -Institut National des Sciences Appliquées de Lyon ( INSA Lyon ), Université de Lyon-Institut National des Sciences Appliquées ( INSA ) -Institut National des Sciences Appliquées ( INSA ), Unité de Recherche : Matériaux, procédés et Environement (UR:MPE), Université M'Hamed Bougara Boumerdes (UMBB), Centre d'études et de recherches appliquées à la gestion (CERAG), Centre National de la Recherche Scientifique (CNRS)-Université Pierre Mendès France - Grenoble 2 (UPMF), Matériaux, ingénierie et science [Villeurbanne] (MATEIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
PZT, Piezoelectric materials, 02 engineering and technology, Impulse (physics), Piezoelectric disks, Lead zirconate titanate, 01 natural sciences, Radial vibrations, [SPI.MAT]Engineering Sciences [physics]/Materials, chemistry.chemical_compound, Axial propagation, Biomedical imaging, Materials Chemistry, Ferroelectric ceramics, Ultrasonics, Piezoelectric actuators, Ultrasonic sensors, 010302 applied physics, Piezoelectric transducers, Ultrasonic imaging, Acoustic impedance, 021001 nanoscience & nanotechnology, Porous PZT, Transducer, Electromechanical devices, PMUT, Impulse methods, 0210 nano-technology, Piezoelectric properties, Porosity, Materials science, Acoustics, Interconnected porosity, [ SPI.MAT ] Engineering Sciences [physics]/Materials, Piezoelectricity, Acoustic parameters, 0103 physical sciences, Disks (structural components), Piezoelectric elements, Current impulse, Interconnection networks, Semiconducting lead compounds, chemistry, Ceramics and Composites, Characterization methods, Ultrasonic sensor
Abstract

cited By 2; International audience; Performances in ultrasonic active transducers of interconnected porous lead zirconate titanate (PZT) piezoelectric disks with a porosity ranging from 30 to 70%, and polarized along their axial axis, are investigated. The characterization method used is based on the measurement of the voltage, which appears between the two faces of the piezoelectric element when it is excited by a current impulse. The device used, allows the acquisition of axial and radial vibrations of the transducer, and from these data, electromechanical and acoustic parameters are deduced. One observes that interconnected porosity causes the disappearance of the radial vibrations, and for large porosities the disk vibrates exclusively according to the axial mode. kt is increased, the acoustic impedance is reduced, and the axial propagation velocity reaches ∼2500 m s-1 for 30% of porosity. These results show that interconnected porous PZT are suitable for making ultrasonic active transducer, such as biomedical imaging devices. © 2009 Elsevier Ltd. All rights reserved.

Published
2010
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