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RESEARCH PAPERS: Vibration and Sound

Prediction of Transient Vibration Envelopes Using Statistical Energy Analysis Techniques

[+] Author and Article Information
M. L. Lai, A. Soom

Department of Mechanical and Aerospace Engineering, State University of New York at Buffalo, Buffalo, NY 14260

J. Vib. Acoust 112(1), 127-137 (Jan 01, 1990) (11 pages) doi:10.1115/1.2930088 History: Received December 01, 1988; Revised May 01, 1989; Online June 17, 2008

Abstract

The prediction, by the statistical energy analysis (SEA) method, of transient vibration envelopes for coupled systems is investigated. The relation between the time-varying energy transferred between two coupled subsystems and time-varying energies of the subsystems is studied numerically and experimentally. These studies indicate that time-varying energy transmitted between two subsystems is related to the subsystem energies by an apparent time-varying coupling loss factor. It is shown that the apparent coupling loss factor approaches the asymptotic (or steady-state) coupling loss factor as response energies and transferred energies are integrated over progressively larger times. Both the apparent time-varying coupling loss factor and the asymptotic coupling loss factor, determined experimentally, are used in energy balance equations to predict the time-varying vibration envelopes of a system of two point-coupled plates and the results are compared. Although overall response predictions are similar, considerable differences are noted in individual frequency bands. However, no general method for a priori determination of the apparent time-varying coupling loss factor is suggested.

Copyright © 1990 by The American Society of Mechanical Engineers
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