Abstract
This paper presents a predictive control method suitable for energy regenerative vibration control systems using class D amplifiers and piezoelectric actuators. The framework of the controller design problems for the energy regenerative systems consists of an objective and two types of constraints. The objective is vibration suppression. The first type constraints are conditions for saturation prevention and the second type constraints are conditions for self-powered operation. We adopt a predictive control approach to solve the problems and design a controller for a single degree of freedom (SDOF) system with a saturation prevention constraint as the first step of this study. We structure the future input in the control horizon of the controller as a linear sum of harmonic functions to reduce the computational loads and the power consumption of the microprocessor for the controller. Numerical simulations of the SDOF system with the controller show that the controller is effective for both cases where the saturation prevention constraint is inactive and active. In addition, this paper also presents the prediction of the time averaged power from the actuator to the SDOF oscillator in the control horizon and the numerical simulations show that the predicted averaged power reflects the trend in the actual averaged power well. This prediction is very useful for taking account of the constraint conditions for self-powered operation in our future study.
