An Extension of the Theory of Acoustic Transmission through Porous Materials,
NAVAL UNDERSEA WARFARE CENTER SAN DIEGO CA
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On the subject of sound absorption by porous materials much work has been done but, unfortunately, before many recent engineering developments and apparatus. There now exists the opportunity to check some of the earlier results and theory derived for sound absorption in porous materials to determine whether the proposed models yield measured properties close enough to the theoretical values to be useful. L. L. Beranek and C. Zwikker both derived theoretical expressions for transmission of a single frequency through a porous media. The aim in this memorandum is to follow Beraneks derivation, and to extend some of his results in the treatment of soft blankets in anticipation of long range needs for their application.
- Acoustic Detection and Detectors