一种压电陶瓷建模与控制的新方法

A New Method for Hysteresis Modeling and Control of Piezoelectric Ceramics

压电陶瓷(PZT)作为变形镜的调节装置,虽然位移精度高,但其自身的迟滞非线性特性却给控制增加了难度,为了克服迟滞非线性的影响,实现高的系统控制精度和响应速度,文章研究了PZT的迟滞非线性建模与控制方法,提出了基于S函数的PZT迟滞非线性特征建模方法与改进的Smith预估控制算法。仿真结果表明:改进的Smith预估控制算法可以有效克服迟滞非线性特征的影响,满足高精度、快响应的实时控制需求,对于PZT控制在实际工程中应用具有指导意义。

As a kind of actuator of deformable mirrors,piezoelectric ceramics have high displacement accuracy,however,the nonlinear hysteresis characteristics make it more difficult to control.In order to overcome the influence of hysteresis nonlinearity and provide fine control accuracy and response speed of the system,the hysteresis nonlinear modeling and its control method are studied.And then,based on the S function,a hysteresis nonlinear characteristics modeling method and an improved Smith predictive control algorithm are proposed.The simulation results show that the improved Smith predictor control algorithm can effectively overcome the influence of hysteretic nonlinear characteristics and meet the real-time control requirements of high precision and fast response.It is of guiding significance for the application of piezoelectric ceramics control in practical engineering.