The Use of Optimally Shaped Piezo-electric Film Sensors in the Active Control of Free Field Structural Radiation, Part 2: Feedback Control

[+] Author and Article Information
S. D. Snyder, N. Tanaka, Y. Kikushima

Mechanical Engineering Laboratory, Agency of Industrial Science & Technology, Ministry of international Trade & Industry, 1-2 Namiki, Tsukuba Science City, Ibaraki 305 JAPAN

J. Vib. Acoust 118(1), 112-121 (Jan 01, 1996) (10 pages) doi:10.1115/1.2889625 History: Received December 01, 1992; Online February 26, 2008


Feedback control of free field structural radiation is considered. State equations are formulated with a transformation which decouples the acoustic power error criterion. Using the resultant equations, expressed in terms of “transformed mode” states, the order of the state equations can be significantly reduced at low frequencies. Two experimental implementations of feedback control strategies using shaped piezoelectric polymer film sensors to measure the transformed system states are described. The first of these is a simple analog implementation. The second implementation is in discrete time, where an adaptive algorithm for optimizing the weights of IIR filters for practical use is described. It is shown that by using the outlined control approach significant levels of low frequency acoustic power attenuation can be obtained with no control spillover and subsequent increase in higher frequency acoustic power output.

Copyright © 1996 by The American Society of Mechanical Engineers
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