ADAPTIVE FEEDFORWARD VIBRATION CONTROL OF FLEXIBLE PLATE STRUCTURES USING PIEZOELECTRIC ACTUATORS

摘要

This paper discusses the active vibration control of flexible plate structures with piezoelectric patches as actuators. A cantilever rectangular plate is considered. Seven piezoelectric patches are bonded on the surface of the plate. The plate is modeled using ANSYS Finite Element Analysis Package. The modal analysis is performed and the state space model used for control law design is formulated. The multi-channel adaptive feedforward control based on the filtered-x LMS (Least Mean Square) algorithm is introduced and utilized to suppress the vibration response of the rectangular plate. Numerical simulations are conducted on reducing bi-sinusoidal response of the plate. In order to evaluate control system robustness, stiffness uncertainties are purposely added to the model of the plate, while the control system parameters keep unchanged. The simulation results show the control system is efficient in reducing vibration responses of the plate with good robustness.