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Title: H∞ disturbance observer design for high precision track following in hard disk drives
Authors: Thum, C.K.
Du, C.
Lewis, F.L.
Chen, B.M. 
Ong, E.H.
Issue Date: 2009
Citation: Thum, C.K., Du, C., Lewis, F.L., Chen, B.M., Ong, E.H. (2009). H∞ disturbance observer design for high precision track following in hard disk drives. IET Control Theory and Applications 3 (12) : 1591-1598. ScholarBank@NUS Repository.
Abstract: Contrary to the conventional method of disturbance observers (DOB) where Q-filter is designed to be a low-pass filter with unity DC gain, the optimal H∞ method has been proposed to design the Q-filter and applied in the servo control system of hard disk drives in track following. Simulation and implementation results have shown that the resultant H∞ DOB improves low-frequency disturbance attenuation without compromising the disturbances attenuation performance at higher frequency region achieved by the nominal feedback controller. In terms of track-following precision, the proposed method is approximately 5 more accurate than the conventional method. © The Institution of Engineering and Technology 2009.
Source Title: IET Control Theory and Applications
ISSN: 17518644
DOI: 10.1049/iet-cta.2008.0317
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