Vibration Control on a Space Flexible Structure with a PZT Stack Actuator Using Strain and MPPF Control

Abstract

This works deals with the vibration control problem on a space frame flexible structure mounted on a rigid revolute servomechanism, which is actuated and controlled with a dc motor as a flexible-like robotic system. For active vibration control is synthesized a combined control scheme, by using a PD with direct strain feedback control for regulation and trajectory tracking tasks, via the rigid joint, and a Multiple Positive Position Feedback (MPPF) control by means of a PZT stack actuator mounted into the structure. Therefore, the endogenous and exogenous vibrations on the overall structure are simultaneously attenuated by the combined controller. The MPPF controller is computed to attenuate the two first dominant (bending) modes, using information obtained from strain gages, to improve the regulation and trajectory tracking of the tip position of the overall structure. The modal parameters of the structure are estimated using experimental modal analysis techniques. Finally, the overall dynamic performance is evaluated and validated by numerical and experimental results.