Skip to Main content Skip to Navigation
Theses

Microstructure et Macro-Comportement Acoustique : Approche par reconstruction d'une Cellule Élémentaire Représentative

Abstract : The fundamental issue of determining acoustic properties of porous media from their local geometry is examined in this PhD dissertation thesis, thanks to a sample of open-cell aluminum foam analyzed by axial computed microtomography. Various geometric properties are measured to characterize the experimental sample at the cell size level. This is done in order to reconstruct a porous medium by means of idealized three- and two- dimensional unit-cells. The frequency dependant thermal and velocity fields governing the propagation and dissipation of acoustic waves through rigid porous media are computed by Brownian motion simulation and the finite element method, respectively. Macroscopic behavior is derived by spatial averaging of the local fields. Our results are compared to experimental data obtained from impedance tube measurements. Firstly, this approach leads to the identification of the macroscopic parameters involved in Pride and Lafarge semi-phenomenological models. Secondly, it yields a direct access to thermal and viscous dynamic permeabilities. However, the bi-dimensional model underestimates the static viscous permeability as well as the viscous characteristic length; what thus require a three-dimensional implementation.
Complete list of metadata

Cited literature [153 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-00123464
Contributor : Camille Perrot <>
Submitted on : Tuesday, January 9, 2007 - 4:42:22 PM
Last modification on : Wednesday, February 10, 2021 - 10:32:06 AM
Long-term archiving on: : Tuesday, June 15, 2010 - 4:36:33 PM

Identifiers

  • HAL Id : tel-00123464, version 1

Collections

CNRS | ENTPE | UDL

Citation

Camille Perrot. Microstructure et Macro-Comportement Acoustique : Approche par reconstruction d'une Cellule Élémentaire Représentative. Acoustique [physics.class-ph]. INSA de Lyon, 2006. Français. ⟨tel-00123464⟩

Share

Metrics

Record views

516

Files downloads

1379