抄録
A control system design for head positioning in a rigid disk system has been studied in this paper. The use of multiple controllers is proposed to cope with variable operating modes. An H∞ controller with robust stability in the track following mode of a recording head and an H2 controller were designed by using a model-matching method for high-speed track seeking. The H2 controller is adapted each seek distance. Finally, a control system was constructed with both controllers. Closed-loop stability is maintained due to the structure of Yula parameterization8) even when the controllers are switched according to the operating mode.
