DISTURBANCE COMPENSATING METHOD, STATE CONTROL DEVICE, TRACK FOLLOWING CONTROL DEVICE, HARD DISK DRIVE AND RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide a disturbance compensating method capable of more effectively compensating for disturbance applied to a plant.;SOLUTION: The disturbance compensating method is for compensating for disturbance applied to a plant 308 controlled by a state control device having an estimator and a controller 310 for generating a first control signal (Ue(k)) in response to a state signal (y) indicating an estimated state of the plant 308. The method includes a process of generating a second control signal (U(k)) by applying a transfer function H(s) having defined gain/frequency characteristics to a control signal derived from the first control signal (Ue(k)), and a process of generating an overall control signal (U(k)) in response to the second control signal (Ul(k))and the control signal derived from the first control signal and applying the overall control signal to the plant 308.;COPYRIGHT: (C)2007,JPO&INPIT