IRFM control with application to HDD servo system

Summary form only given. In Moore et al (Automatica, vol. 29, no. 4, pp. 941-951, 1993), by changing the control input N times faster than the system output is sampled, it was shown that both the closed loop poles and zeros can be arbitrarily assigned. However, the multirate strategy produces a degr...

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Bibliographic Details
Main Authors: Qing-Wei Jia, Kian-Keong Ooi
Format: Conference Proceeding
Language:English
Subjects:
Automatic control
Control systems
Force control
Magnetic films
Magnetic flux
Perpendicular magnetic recording
Poles and zeros
Printing
Servomechanisms
Steady-state
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Summary:Summary form only given. In Moore et al (Automatica, vol. 29, no. 4, pp. 941-951, 1993), by changing the control input N times faster than the system output is sampled, it was shown that both the closed loop poles and zeros can be arbitrarily assigned. However, the multirate strategy produces a degradation in the intersample behavior, namely, intersample ripples appear. In Chen et al (Proc. IECON, pp. 1171-1176, 1999), a multirate control scheme was proposed to attack the intersample chattering. However, the method is only applicable to a control plant which has at least one integrator in its model. Here we present a new intersample ripple free multirate (IRFM) control scheme for general LTI systems. A constraint on the controller parameters is introduced in the scheme to force the multirate control inputs to converge to the same constant level in order to eliminate the intersample ripple.
DOI:10.1109/INTMAG.2002.1000878