Experimental Robust Control of Structural Acoustic Radiation

[+] Author and Article Information
D. E. Cox, G. P. Gibbs

NASA Langley Research Center, Hampton, VA 23661

R. L. Clark

Dept. of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27708-0302

J. S. Vipperman

Dept. of Mechanical Engineering, University of Maine, Orono, ME 04469-5711

J. Vib. Acoust 121(4), 433-439 (Oct 01, 1999) (7 pages) doi:10.1115/1.2893999 History: Received August 01, 1998; Online February 26, 2008


This work addresses the design and application of robust controllers for structural acoustic control. Both simulation and experimental results are presented. H∞ and μ-synthesis design methods were used to design feedback controllers which minimize power radiated from a panel while avoiding instability due to unmodeled dynamics. Specifically, high-order structural modes which couple strongly to the actuator-sensor path were poorly modeled. This model error was analytically bounded with an uncertainty model which allowed controllers to be designed without artificial limits on control effort. It is found that robust control methods provide the control designer with physically meaningful parameters with which to tune control designs and can be very useful in determining limits of performance. However, experimental results also showed poor robustness properties for control designs with ad-hoc uncertainty models. The importance of quantifying and bounding model errors is discussed.

Copyright © 1999 by The American Society of Mechanical Engineers
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