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Time-domain equations for sound propagation in rigid-frame porous media (L)
J. Acoust. Soc. Am. Volume 116, Issue 4, pp. 1889-1892 (2004); (4 pages)
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Add to FacebookA general set of time-domain equations describing linear sound propagation in a rigid-frame, gas-saturated porous medium is derived. The equations, which are valid for all frequencies, are based on a relaxational model for the viscous and thermal diffusion processes occuring in the pores. The dissipative terms in the equations involve convolutions of the acoustic fields with the impulse response of the medium. It is shown that the equations reduce to previously known results in the limits of low and high frequencies. Alternative time-domain equations are also derived based on a Padé approximation.
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History
Received 17 Feb 2004
Accepted 06 Jul 2004
Revised 30 Jun 2004
Accepted 06 Jul 2004
Revised 30 Jun 2004
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ISSN
0001-4966 (print)
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