A fast‐field program for sound propagation in a layered atmosphere above an impedance ground
作者:
R. Raspet,
S. W. Lee,
E. Kuester,
D. C. Chang,
W. F. Richards,
R. Gilbert,
N. Bong,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1985)
卷期:
Volume 77,
issue 2
页码: 345-352
ISSN:0001-4966
年代: 1985
DOI:10.1121/1.391906
出版商: Acoustical Society of America
关键词: acoustic impedance;sound waves;wave propagation;green function;layered materials
数据来源: AIP
摘要:
This paper studies sound propagation in a layered atmosphere bounded by a ground, whose impedance is described by the Delany–Bazley–Chessell’s empirical model. The problem is formulated in terms of a Green’s function integral in the spectral domain, and is numerically evaluated by a Fast Field Program (FFP). Numerical results are included to show that (i) in simple test cases, the FFP solution is in excellent agreement with existing asymptotic solutions; (ii) numerical overflow arises when the number of layers is large and/or the frequency is high, and a method to circumvent this difficulty is described; and (iii) the FFP is a most powerful tool in solving propagation problems in layered media bounded by complex impedances.
点击下载:
PDF
(814KB)
返 回