title: Generalized equation for transient-wave propagation in continuous inhomogeneous rigid-frame porous materials at low frequencies.
abstract: This paper provides a temporal model for the propagation of transient acoustic waves in continuous inhomogeneous isotropic porous material having a rigid frame at low frequency range. A temporal equivalent fluid model, in which the acoustic wave propagates only in the fluid saturating the material, is considered. In this model, the inertial effects are described by the inhomogeneous inertial factor [A. N. Norris, J. Wave Mat. Interact. 1, 365-380 (1986)]. The viscous and thermal losses of the medium are described by two inhomogeneous susceptibility kernels which depend on the viscous and thermal permeabilities. The medium is one-dimensional and its physical parameters (porosity, inertial factor, viscous, and thermal permeabilities) are depth dependent. A generalized wave propagation equation in continuous inhomogeneous material is established and discussed.
authors: Laboratoire de Physique Théorique, Faculté de Physique, USTHB, BP 32 El Alia, Bab Ezzouar 16111, Algeria.
authors: M
authors: M
authors: Fellah
authors: LMA, CNRS, UPR 7051, Aix-Marseille University, Centrale Marseille, F-13402 Marseille Cedex 20, France.
authors: Z E A
authors: ZE
authors: Fellah
authors: LMA, CNRS, UPR 7051, Aix-Marseille University, Centrale Marseille, F-13402 Marseille Cedex 20, France.
authors: E
authors: E
authors: Ogam
authors: Los Alamos National Laboratory, MPA-11, Sensors Electrochemical Devices, Acoustics Sensors Technology Team, MS D429, Los Alamos, New Mexico 87545.
authors: F G
authors: FG
authors: Mitri
authors: LUNAM Universite du Maine, UMR CNRS 6613 Laboratoire d'Acoustique de l'Universite du Maine, UFR STS Avenue O, Messiaen 72085 Le Mans, CEDEX 09 France.
authors: C
authors: C
authors: Depollier