A New Plug-In Adaptive Controller for Rejection of Periodic Disturbances

[+] Author and Article Information
Jwusheng Hu

Department of Mechanical Engineering, Wayne State University, Detroit, MI 48202

Masayoshi Tomizuka

Department of Mechanical Engineering, University of California, Berkeley, CA 94720

J. Dyn. Sys., Meas., Control 115(3), 543-546 (Sep 01, 1993) (4 pages) doi:10.1115/1.2899135 History: Received April 03, 1992; Revised July 01, 1992; Online March 17, 2008


In this paper, an adaptive digital algorithm for rejecting periodic disturbances is proposed. Modified from the adaptive tracking controller [4], the controller is constructed in a “plug-in” manner, i.e., it can be added to an existed feedback control system without altering the original closed-loop configuration. It is shown that the controller can reject disturbances at selected frequencies independently. Furthermore, since the controller only deals with phase and gain of the error signal, no structural information about the plant is required. The controller is implemented on a disk drive system for track following. The result shows that by rejecting the disturbance up to four times of its fundamental frequency, the tracking error is reduced substantially.

Copyright © 1993 by The American Society of Mechanical Engineers
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