Inverse acoustical characterization of porous media

Authors

  • Ali Hamoudi GAUS, Department of Mechanical Engineering, Université de Sherbrooke, Que. J1K 2R1, Canada
  • Raymond Panneton GAUS, Department of Mechanical Engineering, Université de Sherbrooke, Que. J1K 2R1, Canada

Keywords:

Acoustic waves, Elastic moduli, Mathematical models, Parameter estimation, Porosity, Airflow resistivity, Dynamic bulk modulus, Dynamic density, Thermal permeability, Tortuosity

Abstract

A six-parameter model by Johnson Lafarge is used to focus the inversion acoustical characterization of porous media. The model is used to describe the viscous and thermal dissipations of acoustic waves in the porous material. The six macroscopic parameters of the model are open porosity, static airflow resistivity, tortuosity, viscous characteristic dimension, thermal characteristic dimension, and static thermal permeability. The material can be modeled as an equivalent fluid under acoustical excitations if the frame of the porous material is assumed motionless. This equivalent fluid is described by its dynamic density and dynamic bulk modulus. Both dynamic properties are related to the macroscopic parameters of the material and depend on the frequency of excitation.

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Published

2007-09-01

How to Cite

1.
Hamoudi A, Panneton R. Inverse acoustical characterization of porous media. Canadian Acoustics [Internet]. 2007 Sep. 1 [cited 2021 Nov. 29];35(3):200-1. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1968

Issue

Section

Proceedings of the Acoustics Week in Canada