Discrete-time optimal reset control for the improvement of HDD servo control transient performance

This paper proposes a design method of discrete-time reset control systems with the reset time instants prespecified. With a base linear system designed conventionally, the discrete-time reset law design aims at improving the system transient responses. The design method can guarantee the system stability and the solution of the controller is obtained by solving Riccati equations. The proposed reset controller design method is applied to short-span and long-span track seeking of a hard disk drive servo system. Experiment results show that the proposed design is much more capable of improving transient response than traditional control design methods.