Adaptive internal model control for simultaneous precision positioning and vibration suppression of smart structures

Abstract

This paper focuses on adaptive internal model control of smart structures with simultaneous precision positioning and vibration suppression functions. First, the structure, manufacturing, and test of an Active Composite Panel (ACP) with surface-mounted piezoelectric ceramic patches are introduced. Based on the discussion of the 2-DOF internal model control scheme, an adaptive internal model control scheme is then presented, in which the controller is constructed in form of a finite impulse filter, and the filtred-x LMS algorithm is employed to adapt the coefficients of the filter. Finally, the adaptive internal model control scheme is experimentally verified on the ACP, and compared with the adaptive feedforward control scheme, showing that it can produce more accuracy and faster response process. The satisfactory performance confirms that the adaptive internal model control schem is reliable and efficient.