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|Title: ||The effect of mode truncation in an anlysis of acoustic radiation from spheroidal shells|
|Authors: ||pei-tai Chen|
|Issue Date: ||2018-06-07T07:59:09Z
|Publisher: ||The Journal of the Acoustical Society of America|
|Abstract: ||Abstract:A previous presentation [P. T. Chen and J. H. Ginsberg, J. Acoust. Soc. Am. Suppl. 1 85, S139 (1989)] outlined a general procedure by which variational principles may be employed to analyze the surfacepressure and structural response of a shell in the shape of a surface of revolution. The displacement in this treatment may be described directly as a set of admissible, linearly independent, but otherwise arbitrary, basis functions, in conjunction with a comparable description of the surfacepressure. An alternative is to perform an intermediate analysis to determine the in?vacuo displacement modes, and then to truncate the modal series based on a comparison of the eigenfrequencies and the frequency of excitation. This paper assesses the ability of these alternative strategies to treat the response of a prolate spheroidal shell. A matter of specific concern is the situation where proximity of two natural frequencies produces high?frequency in?vacuo modes whose localized displacement patterns suggest that they might be efficient radiators for low?frequency excitation in the fluid?loaded case. [Work supported by the Office of Naval Research, Code 1132?SM.|
|Appears in Collections:||[系統工程暨造船學系] 期刊論文|
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