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An efficient model for coupling structural vibrations with acoustic radiationThe scattering of an incident wave by a flexible panel is studied. The panel vibration is governed by the nonlinear plate equations while the loading on the panel, which is the pressure difference across the panel, depends on the reflected and transmitted waves. Two models are used to calculate this structural-acoustic interaction problem. One solves the three dimensional nonlinear Euler equations for the flow-field coupled with the plate equations (the fully coupled model). The second uses the linear wave equation for the acoustic field and expresses the load as a double integral involving the panel oscillation (the decoupled model). The panel oscillation governed by a system of integro-differential equations is solved numerically and the acoustic field is then defined by an explicit formula. Numerical results are obtained using the two models for linear and nonlinear panel vibrations. The predictions given by these two models are in good agreement but the computational time needed for the 'fully coupled model' is 60 times longer than that for 'the decoupled model'.
Document ID
19930022679
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Frendi, Abdelkader
(Analytical Services and Materials, Inc. Hampton, VA., United States)
Maestrello, Lucio
(NASA Langley Research Center Hampton, VA., United States)
Ting, LU
(Institute for Computer Applications in Science and Engineering Hampton, VA, United States)
Date Acquired
September 6, 2013
Publication Date
April 1, 1993
Subject Category
Acoustics
Report/Patent Number
ICASE-93-18
NAS 1.26:191452
AD-A267483
NASA-CR-191452
Accession Number
93N31868
Funding Number(s)
PROJECT: RTOP 505-90-52-01
CONTRACT_GRANT: NAS1-19480
CONTRACT_GRANT: NAS1-18605
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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