A method for computing the sound power of machines
作者:
G. H. Koopmann,
H. Benner,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1980)
卷期:
Volume 67,
issue S1
页码: 72-72
ISSN:0001-4966
年代: 1980
DOI:10.1121/1.2018368
出版商: Acoustical Society of America
数据来源: AIP
摘要:
In this paper, a computational method for assessing the sound power characteristics of machines is presented. The method, which is based upon a Helmholtz integral formulation, requires a knowledge of the geometry and the modal characteristics of a machine's vibrating surfaces. Closed form integration of the associated surface integral is carried out in a piecewise manner over planar surface elements of simple shapes such as rectangles and triangles. This choice of element allows the grid geometries associated with the acoustic power computations to be made identical to those used in existing structural modal analysis schemes such as finite element methods or Fourier analysis methods. In this way, the sound power characteristics of a given machine can be computed in terms of the sound power radiated by each of the structural modes comprising the overall response. The structural modes can then be ranked in order of their radiation efficiency for purposes of noise control treatments.
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