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279 results on '"Depollier, C."'

11. Permanent magnet couplings: field and torque three-dimensional expressions based on the Coulombian model

Author

Ravaud, R., Lemarquand, G., Lemarquand, V., and Depollier, C.

Subjects
Magnets, Permanent -- Properties, Torque -- Measurement, Magnetization -- Methods, Finite element method -- Usage, Mathematical optimization, Business, Electronics, Electronics and electrical industries
Abstract

This paper presents three-dimensional expressions for the optimization of permanent-magnet couplings. First, we give a fully analytical expression of the azimuthal field created by one arc-shaped permanent magnet radially polarized which takes into account its magnetic pole volume density. Such an expression has a very low computational cost and is exact for all points in space. Then, we propose two semianalytical expressions of the azimuthal force and the torque exerted between two arc-shaped permanent magnets. These expressions are valid for thick or thin arc-shaped permanent magnets. Furthermore, this approach allows us to realize easily parametric studies and optimizations. The analytical approach taken in this paper, based on the Coulombian model, is a good alternative compared to the finite element method generally used to study such configurations. Index Terms--Analytical, azimuthal force, couplings, permanent magnet, radial magnetization, torque.

Published
2009

12. Analytical calculation of the magnetic field created by permanent-magnet rings

Author

Ravaud, R., Lemarquand, G., Lemarquand, V., and Depollier, C.

Subjects
Magnetization -- Evaluation, Magnets, Permanent -- Properties, Magnetic fields -- Identification and classification, Mathematical analysis -- Methods, Business, Electronics, Electronics and electrical industries
Abstract

We present analytical formulations, based on a coulombian approach, of the magnetic field created by permanent-magnet rings. For axially magnetized magnets, we establish the expressions for the three components. We also give the analytical 3-D formulation of the created magnetic field for radially magnetized rings. We compare the results determined by a 2-D analytical approximation to those for the 3-D analytical formulation, in order to determine the range of validity of the 2-D approximation. Index Terms--Analytical calculation, axiai magnetization, magnetic fie|d, permanent-magnet rings, radial magnetization.

Published
2008

14. Measuring flow resistivity of porous material via acoustic reflected waves

Author

Sebaa, N., Fellah, Z.E.A., Fellah, M., Lauriks, W., and Depollier, C.

Subjects
Porous materials -- Electric properties, Sound pressure -- Analysis, Fluid dynamics -- Analysis, Physics
Abstract

An acoustic reflectivity method is proposed for measuring flow resistivity of porous materials having rigid frame. The flow resistivity of porous material is defined as the ratio between the pressure difference across a sample and the velocity of flow of air through that sample per unit cube.

Published
2005

20. Experimental determination of the viscous flow permeability of porous materials by measuring reflected low frequency acoustic waves.

Author

Berbiche, A., Sadouki, M., Fellah, Z. E. A., Ogam, E., Fellah, M., Mitri, F. G., and Depollier, C.

Subjects
SOUND waves, VISCOUS flow, POROUS materials, PERMEABILITY, PLASTIC foams
Abstract

An acoustic reflectivity method is proposed for measuring the permeability or flow resistivity of air-saturated porous materials. In this method, a simplified expression of the reflection coefficient is derived in the Darcy's regime (low frequency range), which does not depend on frequency and porosity. Numerical simulations show that the reflection coefficient of a porous material can be approximated by its simplified expression obtained from its Taylor development to the first order. This approximation is good especially for resistive materials (of low permeability) and for the lower frequencies. The permeability is reconstructed by solving the inverse problem using waves reflected by plastic foam samples, at different frequency bandwidths in the Darcy regime. The proposed method has the advantage of being simple compared to the conventional methods that use experimental reflected data, and is complementary to the transmissivity method, which is more adapted to low resistive materials (high permeability). [ABSTRACT FROM AUTHOR]

Published
2016
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23. Simultaneous determination of porosity, tortuosity, viscous and thermal characteristic lengths of rigid porous materials.

Author

Fellah, Z. E. A., Sadouki, M., Fellah, M., Mitri, F. G., Ogam, E., and Depollier, C.

Subjects
POROUS materials, POROSITY, TORTUOSITY, VISCOSITY, THERMAL properties, SCATTERING (Mathematics), ULTRASONIC waves
Abstract

We present an improved method for the characterization of air-saturated porous materials by simultaneous measurement of porosity, tortuosity, viscous, and thermal characteristic lengths via ultrasonic transmission only. The proposed method is based on a temporal model of the direct and inverse scattering problem for the transient ultrasonic waves in a homogeneous isotropic slab of rigid porous material. The advantage of the proposed method is that the four parameters are determined simultaneously using just transmitted experimental waves from a porous material saturated by one gas (air). In addition, no relationship is assumed between the two characteristic lengths. [ABSTRACT FROM AUTHOR]

Published
2013
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26. Ultrasonic characterization of air-saturated double-layered porous media in time domain.

Author

Fellah, Z. E. A, Sebaa, N., Fellah, M., Mitri, F. G., Ogam, E., and Depollier, C.

Subjects
POROUS materials, ULTRASONICS, TIME-domain analysis, CATHODE ray oscillographs, POROSITY
Abstract

This paper concerns the ultrasonic characterization of air-saturated double-layered porous materials by solving the inverse problem using experimental reflected signals at normal incidence. The double-layered porous media consist of two slabs of homogeneous isotropic porous materials with a rigid frame. The ultrasonic propagation in double-layered porous material is modeled using a temporal model in which the inertial effects are described by the tortuosity. The viscous and thermal losses of the medium are described by two susceptibility kernels which depend on the viscous and thermal characteristic lengths. The sensitivity of porosity, tortuosity, and viscous characteristic length of each layer is studied showing their effect on the reflected interface waveforms. The inverse problem is solved numerically by the least-squares method. Five parameters are inverted: porosity and tortuosity of the two layers and the viscous characteristic length of the first layer. The minimization of the discrepancy between experimental and theoretical data is made in the time domain. The inverse problem is shown to be well posed and its solution to be unique. Experimental results for waves reflected by the interfaces of the double-layered porous material are given and compared with theoretical predictions. [ABSTRACT FROM AUTHOR]

Published
2010
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27. Torque in permanent magnet couplings: Comparison of uniform and radial magnetization.

Author

Ravaud, R., Lemarquand, G., Lemarquand, V., and Depollier, C.

Subjects
MAGNETIC coupling, MAGNETIZATION, FERROMAGNETISM, ELECTROMAGNETISM, MAGNETIC fields
Abstract

We present a three-dimensional study of the torque transmitted between tile permanent magnets uniformly magnetized. All this study is based on the Coulombian model. The torque is calculated semianalytically by considering all the surface densities that appear on the tiles. In addition, no simplifying assumptions are done in the expressions given in this paper. Consequently, the evaluation of the torque is very accurate and allows us to show the drawbacks of using tile permanent magnets uniformly magnetized instead of using tile permanent magnets radially magnetized. Such an approach is useful because it allows us to realize easily parametric studies. [ABSTRACT FROM AUTHOR]

Published
2009
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28. Transient acoustic wave propagation in air-saturated porous media at low frequencies.

Author

Fellah, Z. E. A., Fellah, M., Mitri, F. G., Sebaa, N., Lauriks, W., and Depollier, C.

Subjects
POROUS materials, SCATTERING (Physics), GREEN'S functions, ACOUSTICAL materials, PERMEABILITY
Abstract

This paper provides a temporal model of the direct scattering problem for the propagation of transient low frequency waves in a homogeneous isotropic slab of porous material having a rigid frame. In this model, the inertial effects are described by the low frequency approximation of the tortuosity. The viscous and thermal losses of the medium are modeled by viscous and thermal permeabilities. The propagation equation is derived and solved analytically in the time domain. An original expression of Green’s function of the porous medium is obtained. The transmission scattering operator of the first transmitted wave is calculated and compared with experimental data. [ABSTRACT FROM AUTHOR]

Published
2007
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29. Acoustic wave propagation and internal fields in rigid frame macroscopically inhomogeneous porous media.

Author

De Ryck, L., Lauriks, W., Fellah, Z. E. A., Wirgin, A., Groby, J. P., Leclaire, P., and Depollier, C.

Subjects
POROUS materials, POROSITY, WAVE equation, PHYSICS, PHYSICAL sciences
Abstract

A wave propagation model in macroscopically inhomogeneous porous media is derived from the alternative Biot’s theory of 1962. As a first application, the wave equation is reduced and solved in the case of rigid frame inhomogeneous porous materials. The pressure field, as well as the reflection and transmission coefficients, are obtained numerically using a wave splitting and “transmission” Green’s functions approach (WS-TGF). To validate both the wave equation and the method of resolution at normal and oblique incidence, results obtained by the WS-TGF method are compared to those calculated by the classical transfer matrix method and to experimental measurements for a known two-layered porous material, considered as a single inhomogeneous layer. Discussions are then given of the reflection and transmission coefficients for various inhomogeneity profiles as well as of the internal pressure field. [ABSTRACT FROM AUTHOR]

Published
2007
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30. Characterization of porous materials with a rigid frame via reflected waves.

Author

Fellah, Z. E. A., Mitri, F. G., Depollier, C., Berger, S., Lauriks, W., and Chapelon, J. Y.

Subjects
FOAMED materials, PHYSICS research, SCATTERING (Physics)
Abstract

The inverse problem for waves reflected by porous material is solved at oblique incidence, and an inverse scattering calculation of porosity and tortuosity is given for air-saturated plastic foam samples. The interaction of the sound pulse with the fluid-saturated porous material is described by a time-domain equivalent fluid model. The sensitivity of the porosity and tortuosity is studied and it shows their effect on the reflection coefficient at the first interface. This study shows that porosity is much more sensitive than tortuosity to reflection, especially when the incident angle is less than its critical value, at which the reflection coefficient vanishes. Some advantages and perspectives of this method are discussed. © 2003 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
2003
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31. Ultrasonic measurement of the porosity and tortuosity of air-saturated random packings of beads.

Author

Fellah, Z. E. A., Berger, S., Lauriks, W., Depollier, C., Trompette, P., and Chapelon, J. Y.

Subjects
GRAIN, POROSITY, INVERSE scattering transform, ULTRASONIC waves
Abstract

In the pore space of packed grain material, transport properties are characterized by macroscopic parameters. Some of them, porosity and tortuosity, are measured for random packing of glass beads and compared with evaluations made during previous studies. A simple method for measuring porosity and tortuosity for air-saturated granular media is given. This method is based on a temporal model of the direct and inverse scattering problem for the propagation of transient ultrasonic waves in a homogeneous isotropic slab of porous material with a rigid frame. Viscous and thermal losses of the medium are described by temporal operators describing memory effects in a porous medium. Because of the high attenuation of acoustic waves in air-saturated packings of beads, the wave reflected by this medium is equivalent to the wave reflected by the first interface. Using this approximation, a simple relation between porosity, tortuosity, the angle of incidence, and the reflected wave is obtained. Porosity and tortuosity are thus measured via reflected waves in the porous medium at oblique incidence. Experimental and numerical validation results for this method are given for a sample of random packings of glass beads. © 2003 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
2003
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32. Measuring the porosity of porous materials having a rigid frame via reflected waves: A time domain analysis with fractional derivatives.

Author

Fellah, Z. E. A., Berger, S., Lauriks, W., Depollier, C., and Fellah, M.

Subjects
POROSITY, POROUS materials
Abstract

An ultrasonic reflectivity method is proposed for measuring porosity of porous materials having a rigid frame. Porosity is the relative fraction by volume of the air contained within a material. It is important as one of the several parameters required by acoustical theory to characterize porous materials like plastic foams and fibrous or granular materials. The proposed method is based on a temporal model of the direct and inverse scattering problem for the propagation of transient ultrasonic waves in a homogeneous isotropic slab of porous material having a rigid frame. This time domain model of wave propagation was initially introduced by the authors [Z. E. A. Fellah and C. Depollier, J. Acoust. Soc. Am. 107, 683 (2000)]. The viscous and thermal losses of the medium are described by the model devised by Johnson et al. [D. L. Johnson, J. Koplik, and R. Dashen, J. Fluid. Mech, 176, 379 (1987)] and Allard [J. F. Allard, Chapman and Hall, London, (1993)] modified by a fractional calculus-based method applied in the time domain. Reflection and transmission scattering operators for a slab of porous material are derived from the responses of the medium to an incident acoustic pulse. The porosity is determined from the expressions of these operators. Experimental and numerical validation results of this method are presented. This method has the advantage of being simple, rapid, and efficient. [ABSTRACT FROM AUTHOR]

Published
2003
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34. Acoustic characterization of air-saturated porous materials by solving the inverse problem

Author

Fellah, Z. E. A., Berbiche, A., Felllah, M., Erick Ogam, Depollier, C., Laboratoire de Mécanique et d'Acoustique [Marseille] (LMA ), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Ondes et Imagerie (O&I), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Université des Sciences et de la Technologie Houari Boumediene = University of Sciences and Technology Houari Boumediene [Alger] (USTHB), Laboratoire de Physique Théorique [University of Science and Technology Houari Boumediene] (LPT), Laboratoire d'Acoustique de l'Université du Mans (LAUM), Le Mans Université (UM)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM), Université des Sciences et de la Technologie Houari Boumediene [Alger] (USTHB), and Centre National de la Recherche Scientifique (CNRS)-Le Mans Université (UM)

Subjects
ComputingMilieux_MISCELLANEOUS, [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph]
Abstract

International audience

Published
2016

35. Ultrasonic Measurement of Tortuosity and Viscous Characteristic Length of Double-Layered Porous Absorbing Materials with rigid frames

Author

Sadouki, Mustapha, Berbiche, Amine, Fellah, Mohamed, Fellah, Z.E.A, Depollier, C., Université de Djilali Bounaama Khemis Miliana (univ-DBKM), Université des Sciences et de la Technologie Houari Boumediene [Alger] (USTHB), Ondes et Imagerie (O&I), Laboratoire de Mécanique et d'Acoustique [Marseille] (LMA ), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM), Laboratoire d'Acoustique de l'Université du Mans (LAUM), Centre National de la Recherche Scientifique (CNRS)-Le Mans Université (UM), Université des Sciences et de la Technologie Houari Boumediene = University of Sciences and Technology Houari Boumediene [Alger] (USTHB), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), and Le Mans Université (UM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph]
Abstract

International audience; We propose an indirect method for measuring simultaneously acoustic parameters describing the ultrasonic propagation in double-layered porous material. The porous media consist of two slabs of homogeneous isotropic porous materials with a rigid frame. Each porous slab is described by an equivalent fluid model, in which the acoustic wave propagates only in the fluid saturating the material. The inverse problem is solved numerically using experimental transmitted waves in time domain. The direct problem is solved in frequency domains. Four parameters are inverted : tortuosity and viscous characteristic lengths of the two layers. Tests are performed using industrial plastic foams. Inverted values of acoustic parameters are close to those measured by conventional methods. Experimental and numerical validation results of this method are presented, which show the advantage of using the transmission for measuring the characteristic lengths, unlike the reflection.

Published
2015
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37. Excess ultrasonic attenuation due to inhomogeneities in porous media (A)?

Author

Naas, Mouna, Sebaa, Naima, Fellah, Zine El Abiddine, Fellah, Mohamed, Lauriks, Walter, Depollier, C., Laboratoire d'Acoustique de l'Université du Mans (LAUM), Centre National de la Recherche Scientifique (CNRS)-Le Mans Université (UM), Laboratoire de Mécanique et d'Acoustique [Marseille] (LMA ), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM), Laboratoire de Physique Théorique [University of Science and Technology Houari Boumediene] (LPT), Université des Sciences et de la Technologie Houari Boumediene [Alger] (USTHB), Laboratorium voor Akoestiek en Thermische Fysica (LATF), Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), Le Mans Université (UM)-Centre National de la Recherche Scientifique (CNRS), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), and Université des Sciences et de la Technologie Houari Boumediene = University of Sciences and Technology Houari Boumediene [Alger] (USTHB)

Subjects
[SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph], [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph]
Abstract

International audience; While Biot's theory seems well adapted to model the acoustical waves propagation in cancellous bone, some of its predictions do not agree with the experimental results. The excess of attenuation of the fast wave is one of these discrepancies. In this paper we propose a modified Biot's model which takes into account the fluctuations of the physical parameters and their correlations. As a result of this model, we show that this excess of attenuation is due to several processes: i) classical Biot's attenuation, ii) scattering leading to the extension of the wave path, iii) mode conversion. Some comparison between experimental results and numerical simulations are proposed.

Published
2008

38. Analogy between electromagnetic and acoustic

Author

Fellah, Zine El Abiddine, Sebaa, Naima, Ogam, Erick, Fellah, Mohamed, Depollier, C., Laboratoire de Mécanique et d'Acoustique [Marseille] (LMA ), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Acoustique de l'Université du Mans (LAUM), Le Mans Université (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Théorique [University of Science and Technology Houari Boumediene] (LPT), Université des Sciences et de la Technologie Houari Boumediene = University of Sciences and Technology Houari Boumediene [Alger] (USTHB), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM), Centre National de la Recherche Scientifique (CNRS)-Le Mans Université (UM), and Université des Sciences et de la Technologie Houari Boumediene [Alger] (USTHB)

Subjects
[SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph], ComputingMilieux_MISCELLANEOUS, [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph]
Abstract

International audience

Published
2008

39. Acoustic waves in trabecular bone: application of Biot theory in time domain

Author

Sebaa, Naima, Naas, Mouna, Fellah, Zine El Abiddine, Lauriks, Walter, Depollier, C., Laboratoire d'Acoustique de l'Université du Mans (LAUM), Centre National de la Recherche Scientifique (CNRS)-Le Mans Université (UM), Laboratoire de Mécanique et d'Acoustique [Marseille] (LMA ), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM), Laboratorium voor Akoestiek en Thermische Fysica (LATF), Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), Le Mans Université (UM)-Centre National de la Recherche Scientifique (CNRS), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), and Fellah, Zine El Abiddine

Subjects
[SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph], [SPI.ACOU] Engineering Sciences [physics]/Acoustics [physics.class-ph], [PHYS.MECA.ACOU] Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph], ComputingMilieux_MISCELLANEOUS, [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph]
Abstract

International audience

Published
2007

40. Modélisation temporelle de la propagation acoustique dans un matériau poreux

Author

Fellah, Zine El Abiddine, Depollier, C., Fellah, Mohamed, Laboratoire de Mécanique et d'Acoustique [Marseille] (LMA ), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM), Laboratoire d'Acoustique de l'Université du Mans (LAUM), Centre National de la Recherche Scientifique (CNRS)-Le Mans Université (UM), Laboratoire de Physique Théorique [University of Science and Technology Houari Boumediene] (LPT), Université des Sciences et de la Technologie Houari Boumediene [Alger] (USTHB), M. Bruneau, C. Potel, Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Le Mans Université (UM)-Centre National de la Recherche Scientifique (CNRS), and Université des Sciences et de la Technologie Houari Boumediene = University of Sciences and Technology Houari Boumediene [Alger] (USTHB)

Subjects
[SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph], [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph]
Abstract

ISBN13 : 978-2-7462-1449-1

Published
2006

41. Théories poroélastiques pour la caractérisation des tissus osseux

Author

Sebaa, Naima, Fellah, Zine El Abiddine, Depollier, C., Fellah, Mohamed, Lauriks, Walter, Laboratoire d'Acoustique de l'Université du Mans (LAUM), Le Mans Université (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Mécanique et d'Acoustique [Marseille] (LMA ), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Théorique [University of Science and Technology Houari Boumediene] (LPT), Université des Sciences et de la Technologie Houari Boumediene = University of Sciences and Technology Houari Boumediene [Alger] (USTHB), Laboratorium voor Akoestiek en Thermische Fysica (LATF), Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), M. Bruneau, C. Potel, Centre National de la Recherche Scientifique (CNRS)-Le Mans Université (UM), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM), and Université des Sciences et de la Technologie Houari Boumediene [Alger] (USTHB)

Subjects
[SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph], [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph]
Abstract

ISBN13 : 978-2-7462-1449-1

Published
2006

42. Modèle analytique de propagation dans une plaque fluide rugueuse par décomposition modale

Author

Potel, Catherine, Bruneau, M., Hladky, Anne-Christine, Morvan, B., Izbicki, J.L., Depollier, C., Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Laboratoire d'Acoustique de l'Université du Mans (LAUM), Le Mans Université (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'acoustique ultrasonore et d'électronique (LAUE), Université Le Havre Normandie (ULH), Normandie Université (NU)-Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Le Mans Université (UM), and xxxx

Subjects
[SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph], ComputingMilieux_MISCELLANEOUS, [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph]
Abstract

National audience; Afin d'interpréter quantitativement la décroissance des modes de Lamb, modélisée par une approche analytique et observée de manière expérimentale dans des plaques solides comportant une interface rugueuse, une modélisation plus avancée est développée ici dans un cas beaucoup plus simple, celui d'une plaque fluide comportant une interface rugueuse. Dans le modèle analytique proposé, la rugosité de l'interface est décrite par un opérateur d'impédance qui fait apparaître de manière explicite la densité spectrale de puissance du profil de rugosité, et le champ acoustique est développé sur les modes propres de la plaque. Le problème est résolu dans le domaine temporel, pour toute forme a priori possible de rugosité, en faisant usage du formalisme de Green. La solution apparaît sous la forme de la superposition d'un champ direct non perturbé (interfaces planes) provenant des sources d'énergie acoustique, et d'un facteur de couplages modaux, dû à la présence de rugosité. Cette source de couplage étant une source étendue, elle est représentée sous une forme intégrale qui ne permet pas l'obtention des coefficients de la décomposition modale par une simple inversion de matrice. La complexité du problème à résoudre traduit la complexité du phénomène de couplage non localisé. Le cas particulier du champ créé par une source monochromatique localisée dans une plaque dont les interfaces possèdent un profil de rugosité périodique est présenté à titre de premier exemple

Published
2006

43. Mesures des paramètres acoustiques des matériaux poreux

Author

Fellah, Zine El Abiddine, Depollier, C., Fellah, Mohamed, Lauriks, Walter, Laboratoire de Mécanique et d'Acoustique [Marseille] (LMA ), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM), Laboratoire d'Acoustique de l'Université du Mans (LAUM), Centre National de la Recherche Scientifique (CNRS)-Le Mans Université (UM), Laboratoire de Physique Théorique [University of Science and Technology Houari Boumediene] (LPT), Université des Sciences et de la Technologie Houari Boumediene [Alger] (USTHB), Laboratorium voor Akoestiek en Thermische Fysica (LATF), Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), M. Bruneau, C. Potel, Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Le Mans Université (UM)-Centre National de la Recherche Scientifique (CNRS), and Université des Sciences et de la Technologie Houari Boumediene = University of Sciences and Technology Houari Boumediene [Alger] (USTHB)

Subjects
[SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph], [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph]
Abstract

ISBN13 : 978-2-7462-1449-1

Published
2006

44. Recovery of the mechanical parameters of long bones from their vibroacoustic impulse response

Author

Ogam, Erick, Wirgin, Armand, Fellah, Zine El Abiddine, Groby, Jean-Philippe, Lauriks, W., Chapelon, J.Y., Depollier, C., Deryck, L., Gilbert, R., Sebaa, N., Scotti, Thierry, Rosu, Elena, Laboratoire de Mécanique et d'Acoustique [Marseille] (LMA ), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM), and Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph], [SPI.ACOU] Engineering Sciences [physics]/Acoustics [physics.class-ph]
Published
2005

45. Acoustic identification of a poroelastic cylinder

Author

Ogam, Erick, Wirgin, Armand, Fellah, Zine El Abiddine, Groby, Jean-Philippe, Lauriks, W., Chapelon, J.-Y., Depollier, C., Deryck, L., Gilbert, R., Sebaa, N., Xu, Y.S., Laboratoire de Mécanique et d'Acoustique [Marseille] (LMA ), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), and Rosu, Elena

Subjects
[SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph], [SPI.ACOU] Engineering Sciences [physics]/Acoustics [physics.class-ph]
Published
2005

46. Modal wave decoherence within a fluid layer with a rough surface

Author

Potel, Catherine, Bruneau, M., Morvan, B., Izbicki, J.L., Hladky, A.C., Depollier, C., Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Laboratoire d'Acoustique de l'Université du Mans (LAUM), Le Mans Université (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'acoustique ultrasonore et d'électronique (LAUE), Université Le Havre Normandie (ULH), and Normandie Université (NU)-Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SPI]Engineering Sciences [physics]
Abstract

International audience; The aim of the presentation is to study analytically the propagation of modal waves (like Lamb waves) in a rough fluidplate, in order to interpret the decay of Lamb modes which are observed experimentally and theoretically in solid plateswith a rough interface. The analytical method employed here uses modal wave expansion, expressing locally theroughness as an operator acting on the acoustic pressure. The expansion coefficient corresponding to a given modalwave can be expressed as the sum of the direct field when interfaces are rigid plane (without roughness) and of adiffused field created by the mode coupling due to the roughness.

Published
2005

47. Caractérisation acoustique de matériaux poreux inhomogènes : première approche du problème inverse dans le domaine temporel

Author

Deryck, L., Fellah, Zine El Abiddine, Lauriks, W., Wirgin, Armand, Depollier, C., Laboratoire de Mécanique et d'Acoustique [Marseille] (LMA ), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM), and Rosu, Elena

Subjects
[SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph], [SPI.ACOU] Engineering Sciences [physics]/Acoustics [physics.class-ph]
Published
2005

48. Application de la théorie de Biot sur un tissu biologique

Author

Sebaa, N., Fellah, Zine El Abiddine, Lauriks, W., Depollier, C., Rosu, Elena, Laboratoire de Mécanique et d'Acoustique [Marseille] (LMA ), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)

Subjects
[SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph], [SPI.ACOU] Engineering Sciences [physics]/Acoustics [physics.class-ph], [PHYS.MECA.ACOU] Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph], [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph]
Published
2005

49. Ultrasonic characterization of cancellous bone

Author

Sebaa, N., Fellah, Zine El Abiddine, Lauriks, W., Depollier, C., Rosu, Elena, Laboratoire de Mécanique et d'Acoustique [Marseille] (LMA ), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM), and Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph], [SPI.ACOU] Engineering Sciences [physics]/Acoustics [physics.class-ph]
Published
2005

50. Characterization of air saturated porous materials

Author

Fellah, Zine El Abiddine, Ogam, Erick, Fellah, Mohamed, Depollier, C., Lauriks, W., Laboratoire de Mécanique et d'Acoustique [Marseille] (LMA ), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM), Rosu, Elena, and Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph], [SPI.ACOU] Engineering Sciences [physics]/Acoustics [physics.class-ph]
Published
2005

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