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On the 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
19930016000
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Frendi, A. (Analytical Services and Materials, Inc. Hampton, VA., United States)
Robinson, J. H. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 6, 2013
Publication Date
March 1, 1993
Subject Category
Acoustics
Report/Patent Number
NAS 1.15:107740
NASA-TM-107740
Accession Number
93N25189
Funding Number(s)
PROJECT: RTOP 505-63-50-10
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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