Attenuation of intense sinusoidal waves in air‐saturated, bulk porous materials
作者:
Herbert L. Kuntz,
David T. Blackstock,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1987)
卷期:
Volume 81,
issue 6
页码: 1723-1731
ISSN:0001-4966
年代: 1987
DOI:10.1121/1.394787
出版商: Acoustical Society of America
关键词: ATTENUATION;SOUND WAVES;POROUS MATERIALS;NONLINEAR ACOUSTICS
数据来源: AIP
摘要:
As intense, initially sinusoidal waves propagate in fluids, shocks form and excess attenuation of the wave occurs. We present data indicating that shock formation is not necessary for the occurrence of excess attenuation in nonlinear, lossy media, i.e., air‐saturated, porous materials. An empirical equation is used to describe the excess attenuation of intense sinusoids in porous materials. The acoustic nonlinearity of and the excess attenuation in porous materials may be predicted directly from dc flow resistivity data. An empirical relationship is used to relate an acoustic nonlinearity parameter to the fundamental frequency and relative dc nonlinearity of two structurally different materials.
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