Please use this identifier to cite or link to this item: https://doi.org/10.1109/TIE.2007.893074
Title: Singular perturbation control for vibration rejection in HDDS using the PZT active suspension as fast subsystem observer
Authors: Pang, C.K. 
Lewis, F.L.T.
Ge, S.S. 
Guo, X.
Chen, B.M. 
Lee, T.H.
Keywords: Hard disk drives (HDDs)
PZT
Singular perturbation
Issue Date: Jun-2007
Source: Pang, C.K., Lewis, F.L.T., Ge, S.S., Guo, X., Chen, B.M., Lee, T.H. (2007-06). Singular perturbation control for vibration rejection in HDDS using the PZT active suspension as fast subsystem observer. IEEE Transactions on Industrial Electronics 54 (3) : 1375-1386. ScholarBank@NUS Repository. https://doi.org/10.1109/TIE.2007.893074
Abstract: Currently, position sensors other than the read/write head are not embedded into current hard disk drives (HDDs) due to signal-to-noise ratio and nanometer resolution issues. Moreover, a noncollocated sensor fusion creates nonminimum phase zero dynamics which degrades the tracking performance. In this paper, the singular perturbation theory is applied to decompose the voice coil motor's (VCM's) and induced PZT active suspension's dynamics into fast and slow subsystems, respectively. The control system is decomposed into fast and slow time scales for controller designs, and control effectiveness is increased to tackle more degrees-of-freedom via an inner loop vibration suppression with measured high-frequency VCM's and PZT active suspension's dynamics from the piezoelectric elements in the suspension. Experimental results on a commercial HDD with a laser doppler vibrometer show the effective suppression of the VCM and PZT active suspension's flexible resonant modes, as well as an improvement of 39.9% in 3σ position error signal during track following when compared to conventional notch-based servos. © 2007 IEEE.
Source Title: IEEE Transactions on Industrial Electronics
URI: http://scholarbank.nus.edu.sg/handle/10635/57424
ISSN: 02780046
DOI: 10.1109/TIE.2007.893074
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