Tuning of A Digital Disk Drive Servo Controller Using Fixed-structure
H-infinity Controller Optimization
Weiguang Niu (Storage Technology Division, IBM)
Soichi Ibaraki (Kyoto University)
Masayoshi Tomizuka (University of California at Berkeley)
Abstract
To address the problem of improving the positioning
accuracy of the read write head of hard disk drives
(HDDs), we present a tuning methodology for the HDD
servo controller based on the fixed-structure H-infinity controller
optimization. Since optimization is carried out under
the fixed controller structure without any additional
sensor, no extra cost is introduced. The effectiveness of
the proposed method is demonstrated by simulation and
experimentation.
Key Words: Control and optimization, Disk drive servo, H-infinity control, Fixed-structure controller optimization, Digital Control
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