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Reference Signal Shaping for Closed-Loop Systems With Application to Seeking in Hard Disk Drives

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5 Author(s)
Boettcher, U. ; Dept. of Mech. & Aerosp. Eng., Univ. of California San Diego, La Jolla, CA, USA ; Fetzer, D. ; Li, H. ; de Callafon, R.A.
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An input shaping algorithm based on convex optimization techniques is presented for the design of reference and feedforward signals in a closed-loop discrete-time linear time-invariant system. The proposed algorithm allows closed-loop signals to be subjected to linear constraints on amplitude and rate of change. As an illustrative example the seeking process in a hard disk drive is investigated. The closed-loop system response to both shaped and non-shaped inputs are compared. The computational scheme was experimentally tested on a modified hard disk drive.

Published in:

Control Systems Technology, IEEE Transactions on  (Volume:20 ,  Issue: 2 )