H∞ disturbance observer design for high precision track following in hard disk drives

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H∞ disturbance observer design for high precision track following in hard disk drives

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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.

Inspec keywords: observers; low-pass filters; disc drives; feedback; hard discs; H∞ control; control system synthesis

Other keywords: Q-filter; hard disk drives; high precision track following; feedback controller; low-pass filter; H∞ disturbance observer design; low-frequency disturbance attenuation

Subjects: Simulation, modelling and identification; Other applications of control; Optimal control; Storage on moving magnetic media; Control system analysis and synthesis methods

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