A class of preview control for dual-stage actuator systems

This paper proposes a novel "preview control" approach to dual-stage actuator (DSA) systems based on the redundancy of actuators. While conventional tracking controllers are designed such that the primary actuator asymptotically approaches the set point, the proposed methodology allows it to move freely within the range of the secondary actuator. Then, the secondary actuator controller is designed such that the error between the primary actuator and the set point can be compensated. The main advantage of the proposed controller is exhibited in the successive set point control scenario, and its effectiveness is demonstrated by numerical simulation.