L∞ controller design for feedback control of a thermal microactuator.

An L∞ design method is proposed to design the controller for dynamic systems with input constraint. The method relies on a multi-objective approach which involves the sensitivity function shaping technique with constraint on plant input. The *-norm approach makes the controller design problem solvable in terms of linear matrix inequalities. The controller design focuses on minimising the control signal peak value while simultaneously satisfying necessary control performances such as bandwidth and disturbance rejection capability. The design method is then applied to the feedback controller design of a microactuator with stringent input limitation. The proposed method is verified by simulation and experimental results, and a 6 kHz bandwidth is achieved by the designed feedback control loop. [ABSTRACT FROM AUTHOR]