Abtract-In this paper, a fuzzy tuning algorithm is developed for the computer disk drive track following servo system. A Zentek 3100 disk drive is modified, and a controller scheduling capability is added to the servo loop to compensate for the plant variations as the actuator is locked on to dierent tracks. The mathematical models for the actuator on a number of tracks chosen are experimentally identified. The Hm design technique is then employed to obtain a robust optimal controller for each operating point. A combined controller b then calculated using a h s s y algorithm. The fuzzy algorithm is used to represent the complex relationship between the track number and the corresponding controller. It is shown that with the controller scheduling action, the closed-loop performance is improved for the actuator at every track positions.
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