Discrete-time H2 optimal reset control with application to HDD track-following

This paper proposes a design method of discrete-time reset control systems with the reset time instants pre-specified. With a base linear system designed conventionally, the discrete-time reset law design aims at improving disturbance suppression of the system. The design method can be converted to a standard H
2
optimal control problem and the solution of the controller is obtained by solving Riccati equations. The proposed reset controller design method is applied to track following stage of a hard disk drive servo system.