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RESEARCH PAPERS

Effect of a Vibrating Substructure on Acoustic Radiation from a Cylindrical Shell

[+] Author and Article Information
J. D. Achenbach, J. Bjarnason, T. Igusa

Robert R. McCormick School of Engineering and Applied Science, Department of Civil Engineering, Northwestern University, Evanston, IL 60208-3109

J. Vib. Acoust 114(3), 312-318 (Jul 01, 1992) (7 pages) doi:10.1115/1.2930263 History: Received March 01, 1991; Online June 17, 2008

Abstract

The presence of a substructure in a cylindrical shell gives rise to dynamic interactions, including resonance effects, which have an influence on the radiated acoustic field. The lowest mode of the substructure may interact vigorously with a higher order mode of the shell. In this paper a Lagrangian formulation is used to analyze the forced motion of the immersed shell/substructure system. In addition, the frequency window method is used to reduce the complexity of the resulting expressions and to obtain approximate solutions in a frequency range of interest. The particular example is concerned with a spring-mass system, which is attached to the shell. Three cases of forced harmonic motion are considered. The radiated pressure is computed as a function of the frequency. The radiated pressure for the shell/substructure system is compared with that for a shell without an oscillator subjected to the same input force.

Copyright © 1992 by The American Society of Mechanical Engineers
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