Sound Propagation and Absorption in Foam: A Distributed Parameter Model
作者:
Lidia Manson,
Seymour Lieberman,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1971)
卷期:
Volume 50,
issue 4A
页码: 1075-1080
ISSN:0001-4966
年代: 1971
DOI:10.1121/1.1912731
出版商: Acoustical Society of America
数据来源: AIP
摘要:
Liquid‐base foams are highly effective sound absorbers. A better understanding of the mechanisms of sound absorption in foams was sought by exploration of a mathematical model of bubble pulsation and coupling and the development of a distributed‐parameter mechanical analog. A solution by electric‐circuit analogy was thus obtained and transmission‐line theory was used to relate the physical properties of the foams to the characteristic impedance and propagation constants of the analog transmission line. Comparison of measured physical properties of the foam with values obtained from measured acoustic impedance and propagation constants and the transmission‐line theory showed good agreement. We may therefore conclude that the sound propagation and absorption mechanisms in foam are accurately described by the resonant response of individual bubbles coupled to neighboring bubbles.
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