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  • 2009 [1]

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  • B.M. Chen [1]
  • C. Du [1]
  • C.K. Thum [1]
  • E.H. Ong [1]
  • F.L. Lewis [1]
H∞ disturbance observer design for high precision track following in hard disk drives
Author(s): C.K. Thum, C. Du, F.L. Lewis, B.M. Chen, E.H. Ong
Source: IET Control Theory & Applications, Volume 3, Issue 12, 2009 , p. 1591 - 1598
Type: Article
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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.

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