A COMPARISON AND REVIEW OF THEORIES OF THE ACOUSTICS OF POROUS MATERIALS

This article reviews the research on acoustic waves in porous media. Particular emphasis is placed on the relationship between the full Biot‐Allard (J. Allard, Propagation of sound in porous media. Elsevier Applied Science, 1993.) model and the simpler approximations presented by Zwikker and Kosten(C. Zwikker and C. W. Kosten, Sound Absorbing Materials. Elsevier Publishing Inc, New York, 1949.), Morse and Ingard (P. M. Morse and K. U. Ingard, Theoretical Acoustics. Princeton University Press, Princeton, New Jersey, 1986.), and others. A comparison of several models used to predict the absorption characteristics of porous materials is presented.

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