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Effect of acoustic coupling on random and harmonic plate vibrationsThe effect of acoustic coupling on random and harmonic plate vibrations is studied using two numerical models. In the coupled model, the plate response is obtained by integration of the nonlinear plate equation coupled with the nonlinear Euler equations for the surrounding acoustic fluid. In the uncoupled model, the nonlinear plate equation with an equivalent linear viscous damping term is integrated to obtain the response of the plate subject to the same excitation field. For a low-level, narrow-band excitation, the two models predict the same plate response spectra. As the excitation level is increased, the response power spectrum predicted by the uncoupled model becomes broader and more shifted towards the high frequencies than that obtained by the coupled model. In addition, the difference in response between the coupled and uncoupled models at high frequencies becomes larger. When a high intensity harmonic excitation is used, causing a nonlinear plate response, both models predict the same frequency content of the response. However, the level of the harmonics and subharmonics are higher for the uncoupled model. Comparisons to earlier experimental and numerical results show that acoustic coupling has a significant effect on the plate response at high excitation levels. Its absence in previous models may explain the discrepancy between predicted and measured responses.
Document ID
19930071357
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Frendi, Abdelkader
(Analytical Services and Materials, Inc. Hampton, VA, United States)
Robinson, Jay
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 16, 2013
Publication Date
November 1, 1993
Publication Information
Publication: AIAA Journal
Volume: 31
Issue: 11
ISSN: 0001-1452
Subject Category
Acoustics
Accession Number
93A55354
Funding Number(s)
CONTRACT_GRANT: NAS1-19317
Distribution Limits
Public
Copyright
Other

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