부산대학교 도서관

The piezoelectric actuator (PEA) is widely used to realize high precise motion of the micro-systems. However, the inherent nonlinear property such as hysteresis, creep, thermal drift and vibration impairs the overall performance and leads to the system instability. In this paper, a practical nonlinear model predictive control (PNMPC) approach based on an echo state network is proposed for the displacement tracking of PEAs. The proposed method has the advantage of omitting the common building process of an inversion model for hysteresis compensation, which avoids the problem of model inversion and the inversion imprecision. Specifically, an echo state network (ESN) is adopted to model the nonlinear dynamics of the PEA system. On this basis, the PNMPC method is designed via utilizing the linearized ESN model, which reduces the computational complexity of the optimization problem caused by nonlinear model predictive control. Finally, the tracking performance of the proposed controller is verified through experimental results.