Coupling between plate vibration and acoustic radiationA detailed numerical investigation of the coupling between the vibration of a flexible plate and the acoustic radiation is performed. The nonlinear Euler equations are used to describe the acoustic fluid while the nonlinear plate equation is used to describe the plate vibration. Linear, nonlinear, and quasi-periodic or chaotic vibrations and the resultant acoustic radiation are analyzed. We find that for the linear plate response, acoustic coupling is negligible. However, for the nonlinear and chaotic responses, acoustic coupling has a significant effect on the vibration level as the loading increases. The radiated pressure from a plate undergoing nonlinear or chaotic vibrations is found to propagate nonlinearly into the far field. However, the nonlinearity due to wave propagation is much weaker than that due to the plate vibrations. As the acoustic wave propagates into the far field, the relative difference in level between the fundamental and its harmonics and subharmonics decreases with distance.
Document ID
19930040732
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Frendi, Abdelkader (Analytical Services and Materials, Inc. Hampton, VA, United States)
Maestrello, Lucio (NASA Langley Research Center Hampton, VA, United States)
Bayliss, Alvin (Northwestern Univ. Chicago, IL, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Subject Category
Acoustics
Report/Patent Number
AIAA PAPER 93-0603
Meeting Information
Meeting: AIAA, Aerospace Sciences Meeting and Exhibit