Smart sensors and actuators used for both free and forced vibration control

Abstract

The control methods used for shock or free vibration suppression are usually different from those for forced vibration cancellation, because shock vibration can be regarded as a type of transient vibration that is different in nature from steady-state forced vibration. In reality, however, both steady-state and transient excitations may occur in flexible structures, so there is a need to control both types of vibration. To show the integration of various vibration control strategies, a hybrid control system based on adhesive strain gauges and PZT patches is proposed to construct a distributed resonant absorber and a distributed shock absorber together. The hybrid system is governed by a control arbitrator that switches between the two active vibration absorbers according to the different excitation conditions. The effectiveness of the integrated system is shown through simulation and experimental studies.