Modeling and Control of Acoustic Structure Interaction Problems Via Piezoceramic Actuators: 2-D Numerical Examples

[+] Author and Article Information
H. T. Banks

Center for Research in Scientific Computation, North Carolina State University, Raleigh, NC 27695

R. J. Silcox

Acoustics Division, NASA Langley Research Center, Hampton, VA 23665

R. C. Smith

ICASE, NASA Langley Research Center, Hampton, VA 23665

J. Vib. Acoust 116(3), 386-396 (Jul 01, 1994) (11 pages) doi:10.1115/1.2930440 History: Received July 01, 1992; Revised July 01, 1993; Online June 17, 2008


The modeling and active control of acoustic pressure in a 2-D cavity with a flexible boundary (a beam) is considered. Control is implemented in the model via piezoceramic patches on the beam, which are excited in a manner so as to produce pure bending moments. Approximation techniques are discussed and, by writing the resulting system as an abstract Cauchy equation, the problem of reducing interior pressure fluctuations can be posed in the context of an LQR time domain state space formulation. Examples illustrating the dynamic behavior of the coupled system, as well as demonstrating the viability of the control method on a variety of problems with periodic forcing functions, are presented.

Copyright © 1994 by The American Society of Mechanical Engineers
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