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Rejecting oscillatory, non-synchronous mechanical disturbances in hard disk drives

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3 Author(s)
Ehrlich, R. ; Quantum Corp., Milpitas, CA, USA ; Adler, J. ; Hindi, H.

This paper describes a “testbook” technique for rejecting narrow-band disturbances to a hard-disk-drive servo loop, by including a model of the disturbance in the drive's state-space controller, and then canceling it. Both numerical simulations and experimental evidence are presented which show significant reductions in tracking errors due to the targeted disturbance in steady-state operation. Simulations of the transient behavior of the augmented control loop, however, show some undesirable characteristics

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Magnetics, IEEE Transactions on  (Volume:37 ,  Issue: 2 )