Modelling a Structural-Acoustic Coupled System with an Equivalent Lumped Parameter Mechanical System

[+] Author and Article Information
S. M. Kim, M. J. Brennan

Institute of Sound and Vibration Research, University of Southampton, Southampton, Hampshire SO17 1BJ UK

J. Vib. Acoust 121(4), 453-459 (Oct 01, 1999) (7 pages) doi:10.1115/1.2894002 History: Received August 01, 1998; Online February 26, 2008


This paper describes the way in which a structural acoustic coupled system can be modelled using an equivalent lumped parameter mechanical model. The impedance-mobility approach is first used to model the system, and by relating the physical parameters to equivalent mass and stiffness, lumped parameter models can be derived provided that damping in the acoustic system is neglected in all modes, but the first (zero order) mode. A limitation of this approach, however, is that these simple mechanical models formulated in terms of the uncoupled structural and acoustic modes are only possible for either a single structural mode coupled to many acoustic modes, or a single acoustic mode coupled to many structural modes. These models facilitate physical insight into the dynamic behavior of a lightly-damped structural-acoustic system at frequencies close to the resonance frequencies of the coupled system.

Copyright © 1999 by The American Society of Mechanical Engineers
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