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Title

Optimal narrow-band disturbance filter for PZT-actuated head positioning control on a spinstand

Author(s)

Zheng, Jinchuan;  Guo, Guoxiao;  Wang, Youyi;  Ee Wong, Wai

Abstract

Narrow-band position error at midfrequencies around the open-loop crossover frequency cannot be effectively reduced by using a conventional peak filter, because the attenuation of sensitivity gains has to be traded off with the associated decrease of phase margin. This paper presents a general second-order filter that can reject narrow-band disturbances at any frequency range. The filter zero is designed to minimally degrade the closed-loop system stability and obtain a smooth sensitivity curve around the disturbance frequency. The paper presents a nonlinear optimization procedure for selecting the filter parameters so that the statistical position error is minimized. Experimental results of a piezoelectrically actuated head positioning control system on a spinstand demonstrate that the add-on filter can further reduce the midfrequency nonrepeatable runout of the position error signal by 8% and preserve the stability margin of the original feedback control system.

Publication type

Journal article

Source

IEEE Transactions on Magnetics, Vol. 42, no. 11 (Nov 2006), pp. 3745-3751

Publication year

2006

FOR Code(s)

02 Physical Sciences;  09 Engineering

Keyword(s)

Actuators;  Closed loop control systems;  Hard disk drives;  Magnetic filters;  Narrow band disturbance filter;  Optimisation;  Piezoelectric devices;  Position control;  Spinstand;  System stability

Publisher

IEEE

ISSN

0018-9464

Publisher URL

http://dx.doi.org/10.1109/tmag.2006.881290

Copyright

Copyright © 2006 IEEE. The published version is reproduced in accordance with the copyright policy of the publisher. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.

Full text

Peer reviewed