Structural Control Using Analog Phase-Locked Loops

[+] Author and Article Information
C. Niezrecki, H. H. Cudney

Department of Mechanical Engineering, Virginia Polytechnic Institute and State University, Biacksburg, Virginia 24061-0238

J. Vib. Acoust 119(1), 104-109 (Jan 01, 1997) (6 pages) doi:10.1115/1.2889677 History: Received December 01, 1994; Online February 26, 2008


A study of the application of the phase-locked loop (PLL) to modal control of mechanical structures is performed. An analog PLL circuit is used to control the vibration of a cantilevered beam with piezoelectric sensors and actuators. By using the PLL controller, strain rate feedback is provided within a narrow and distinct frequency range about the fourth mode of the beam. The controller ignores all other modes and does not affect the phase outside of the frequency range. The PLL controller provides a simple, inexpensive, and effective method to control an individual structural mode or set of modes without causing spillover.

Copyright © 1997 by The American Society of Mechanical Engineers
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