A description of transversely isotropic sound absorbing porous materials by transfer matrices

A description of wave propagation in transversely isotropic porous materials saturated by air with a recent reformulation of the Biot theory is carried out. The description is performed in terms of a transfer matrix method (TMM). The anisotropy is taken into account in the mechanical parameters (ela...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2009-02, Vol.125 (2), p.915-921
Main Authors: Khurana, P., Boeckx, L., Lauriks, W., Leclaire, P., Dazel, O., Allard, J. F.
Format: Article
Language:English
Subjects:
Acoustics
Acoustics - instrumentation
Air
Anisotropy
Elasticity
Equipment Design
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Mechanics
Models, Theoretical
Noise - prevention & control
Noise: its effects and control
Physics
Porosity
Rheology
Structural acoustics and vibration
Surface Properties
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Summary:A description of wave propagation in transversely isotropic porous materials saturated by air with a recent reformulation of the Biot theory is carried out. The description is performed in terms of a transfer matrix method (TMM). The anisotropy is taken into account in the mechanical parameters (elastic constants) and in the acoustical parameters (flow resistivity, tortuosity, and characteristic lengths). As an illustration, the normal surface impedance at normal and oblique incidences of transversely isotropic porous layers is predicted. Comparisons are performed with experimental results.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.3035840