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Asymptotic modal analysis of a rectangular acoustic cavity excited by wall vibrationAsymptotic modal analysis, a method that has recently been developed for structural dynamical systems, has been applied to a rectangular acoustic cavity. The cavity had a flexible vibrating portion on one wall, and the other five walls were rigid. Banded white noise was transmitted through the flexible portion (plate) only. Both the location along the wall and the size of the plate were varied. The mean square pressure levels of the cavity interior were computed as a ratio of the result obtained from classical modal analysis to that obtained from asymptotic modal analysis for the various plate configurations. In general, this ratio converged to 1.0 as the number of responding modes increased. Intensification effects were found due to both the excitation location and the response location. The asymptotic modal analysis method was both efficient and accurate in solving the given problem. The method has advantages over the traditional methods that are used for solving dynamics problems with a large number of responding modes.
Document ID
19920054207
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Peretti, Linda F.
(NASA Langley Research Center Hampton, VA, United States)
Dowell, Earl H.
(Duke University Durham, NC, United States)
Date Acquired
August 15, 2013
Publication Date
May 1, 1992
Publication Information
Publication: AIAA Journal
Volume: 30
Issue: 5 Ma
ISSN: 0001-1452
Subject Category
Acoustics
Accession Number
92A36831
Funding Number(s)
CONTRACT_GRANT: NAG1-709
CONTRACT_GRANT: NGT-50342
Distribution Limits
Public
Copyright
Other

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