A Comparative Case Study of Active Vibration Suppression by Active Power Absorption

Abstract

An optimal SISO active power absorption algorithm has recently been developed, by the authors, that maximizes the broadband power transferred from a structure to a control actuator. In this paper, numerical performance studies are presented for a controller employing this algorithm to suppress global vibrations of a simple example beam structure. The performance of optimal power absorption control strategy based only on measurement at the actuator location is compared to the performance of an optimal Linear Quadratic Regulator (LQR) controller with the same single actuator but with full state (or modal) feedback. The power absorption strategy achieved vibration reduction similar to the optimal LQR controller over most of the frequency range examined. As expected, both of these control strategies resulted in substantially better global vibration reduction than a controller that minimizes motion only at the single actuator location.