STOCHASTIC VIBRATION CONTROL BASED ON PIEZOELECTRIC STACK INERTIAL ACTUATOR¹⁾

This paper presents a stochastic vibration control strategy based on a piezoelectric stack inertial actuator and investigates the influence of the time delay on the control effectiveness. Firstly, the dynamic characteristics of the piezoelectric stack inertial actuator are analyzed, and the stochastic dynamic model of the main structure with an inertia actuator is established. Then, the LQG (linear quadratic Gaussian) control strategy is proposed and the influences of the system parameters (such as the inertia mass and the stiffness of the actuator) on the control effectiveness are discussed. Finally, the time delay is considered in designing the control strategy and a method of using the time delay is proposed to optimize the control strategy. The results show that the piezoelectric stack inertial actuator is very effective for the random vibration control, and the control effectiveness can be further optimized when the time delay \tau=0.025s.