Abstract
Vibration control of smart structures using piezoelectric actuators have been studied widely. Saturation of the piezoelectric actuators and the amplifiers for driving the actuators is an important practical problem. However, the problem has not been studied enough. On the other hand, if the input voltage amplitude of the actuators in operating conditions are smaller than the maximum voltage limits of the actuators and the amplifiers, the feedback gains of the controller can be increased and the control performance can be improved. Model predictive control method is a method that can treat the above mentioned problems. However, the computational load of the method is much larger than conventional linear controllers because the method requires to solve the optimization problem with constraints in each time step. The large computational load causes large energy consumption and heat generation of controllers. It may prevent integration of structures and controllers of smart structure systems. In this paper, two adaptive gain feedback methods are proposed as the methods can treat the problems with smaller computational load. The performance of the two methods are examined by numerical simulations and compared each other.
