This paper discusses the design and implementation of two track-following controllers for dual-stage hard disk drive servo systems. The first controller is designed by combining an outer loop sensitivity-decoupling (SD) controller with an inner loop disturbance observer (DOB). The second is designed by combining mixed H2/H∞ synthesis techniques with an add-on integral action. The designed controllers were implemented and evaluated on a disk drive with a PZT-actuated suspension-based dual-stage servo system. Position error signal (PES) for the servo system was obtained by measuring the slider displacement with an LDV and injecting a simulated track runout.
- Dynamic Systems and Control Division
Design and Implementation of Dual-Stage Track-Following Control for Hard Disk Drives
Nie, J, & Horowitz, R. "Design and Implementation of Dual-Stage Track-Following Control for Hard Disk Drives." Proceedings of the ASME 2009 Dynamic Systems and Control Conference. ASME 2009 Dynamic Systems and Control Conference, Volume 2. Hollywood, California, USA. October 12–14, 2009. pp. 565-572. ASME. https://doi.org/10.1115/DSCC2009-2756
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