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Active control of panel vibrations induced by a boundary layer flowThe problems of active and passive control of sound and vibration has been investigated by many researchers for a number of years. However, few of the articles are concerned with the sound and vibration with flow-structure interaction. Experimental and numerical studies on the coupling between panel vibration and acoustic radiation due to flow excitation have been done by Maestrello and his associates at NASA/Langley Research Center. Since the coupled system of nonlinear partial differential equations is formidable, an analytical solution to the full problem seems impossible. For this reason, we have to simplify the problem to that of the nonlinear panel vibration induced by a uniform flow or a boundary-layer flow with a given wall pressure distribution. Based on this simplified model, we have been able to consider the control and stabilization of the nonlinear panel vibration, which have not been treated satisfactorily by other authors. Although the sound radiation has not been included, the vibration suppression will clearly reduce the sound radiation power from the panel. The major research findings are presented in three sections. In section two we describe results on the boundary control of nonlinear panel vibration, with or without flow excitation. Sections three and four are concerned with some analytical and numerical results in the optimal control of the linear and nonlinear panel vibrations, respectively, excited by the flow pressure fluctuations. Finally, in section five, we draw some conclusions from research findings.
Document ID
19950016765
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Chow, Pao-Liu (Wayne State Univ. Detroit, MI, United States)
Date Acquired
September 6, 2013
Publication Date
January 24, 1995
Subject Category
Aerodynamics
Report/Patent Number
NAS 1.26:197867
NASA-CR-197867
Accession Number
95N23182
Funding Number(s)
CONTRACT_GRANT: NAG1-1175
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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