A Spectral Analysis Approach for Acoustic Radiation from Composite PanelsA method is developed to predict the vibration response of a composite panel and the resulting far-field acoustic radiation due to acoustic excitation. The acoustic excitation is assumed to consist of obliquely incident plane waves. The panel is modeled by a finite element analysis and the radiated field is predicted using Rayleigh's integral. The approach can easily include other effects such as shape memory alloy (SMA) ber reinforcement, large detection thermal postbuckling, and non-symmetric SMA distribution or lamination. Transmission loss predictions for the case of an aluminum panel excited by a harmonic acoustic pressure are shown to compare very well with a classical analysis. Results for a composite panel with and without shape memory alloy reinforcement are also presented. The preliminary results demonstrate that the transmission loss can be significantly increased with shape memory alloy reinforcement. The mechanisms for further transmission loss improvement are identified and discussed.
Document ID
20040111294
Acquisition Source
Langley Research Center
Document Type
Other
Authors
Turner, Travis L. (NASA Langley Research Center Hampton, VA, United States)
Singh, Mahendra P. (Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Mei, Chuh (Old Dominion Univ. Norfolk, VA, United States)