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Optimal Narrow-Band Disturbance Filter for PZT-Actuated Head Positioning Control on a Spinstand

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4 Author(s)
J. Zheng ; Data Storage Inst., Singapore ; G. Guo ; Y. Wang ; W. E. Wong

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

Published in:

IEEE Transactions on Magnetics  (Volume:42 ,  Issue: 11 )