1.Key Laboratory of Micro/Nano Devices and Systems,Ministry of Education,North University of China,Taiyuan 030051,China
2.State Key Laboratory of Extreme Environment Optoelectronic Dynamic Measurement Technology and Instrument,North University of China,Taiyuan 030051,China
To enhance the control performance of the piezoelectric actuator speed regulation system, a linearized control method based on the whale optimization algorithm (WOA) for optimizing model predictive control (MPC) parameters is proposed. Firstly, a temperature-coupled nonlinear model of the piezoelectric actuator is developed, and its three-dimensional model is constructed in SolidWorks. The vibration modes of the stator are then simulated and analyzed in COMSOL. Subsequently, a Koopman discrete state-space model is established, and a model predictive controller is designed for the piezoelectric actuator to improve the control accuracy of the system. Finally, high-precision control of the piezoelectric actuator is achieved by tuning the MPC parameters using WOA. The results demonstrate that the WOA-optimized Koopman-MPC control method reduces the system overshoot by 1.68% compared to that of the conventional Koopman-MPC, shortens the settling time to within 0.6 s, and exhibits superior control performance.
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