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Lowering the hump of sensitivity functions for discrete-time dual-stage systems

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2 Author(s)
Chunling Du ; ASTAR, Data Storage Inst., Singapore, Singapore ; Guoxiao Guo

This brief is concerned with servo loop design in the discrete-time domain that aims to achieve a low-hump sensitivity function for dual-stage hard disk drive (HDD) systems. Sensitivity functions for the discrete-time dual-stage systems are analyzed on the basis of the Bode integral theorem. A 3-dB sensitivity function hump is achieved in simulation for the discrete-time dual-stage actuation system with a piezoelectric (PZT) microactuator (MA) using the H loop shaping method and the proposed linear matrix inequality (LMI) approach. Additionally, implementation is done for the PZT MA dual-stage system and a sensitivity function with the magnitude lower than 3 dB being achieved.

Published in:

IEEE Transactions on Control Systems Technology  (Volume:13 ,  Issue: 5 )