Abstract
The steady‐state response of a rectangular room to a monopole point source is studied. The room is lined over some portion of its surface with an anisotropic bulk reacting porous absorber. The boundary condition describing the porous liner is an anisotropic analogue of Bliss' bulk reaction boundary condition [D. Bliss, J. Acoust. Soc. Am. 71, 533–545 (1982)], which is valid when the acoustic wavelength is larger than the material thickness. The solution for the pressure response is given as a sum of eigenmodes, with a damping term due to the absorptive walls. This damping factor includes a component expressed in terms of the transverse wavenumber in the porous layer, demonstrating that bulk reacting liners augment sound absorption. The effect of the anisotropy on the attenuation is also seen to be important at these low frequencies, since the low modal density does not permit describing the absorptive liner in terms of a random incidence sound absorption coefficient. Numerical calculations for a “typical” room will be presented.
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