Closed-loop control system of piezoceramic actuators with improved Preisach model

The hysteresis nonlinearity and creep of the piezoceramic actuator are the main factors that affect its displacement output precision. The digital formula of the improved Preisach model, which aims at the hysteresis nonlinearity, is applied. According to the creep characteristic of the piezoceramic actuator, the data of its creep point are sampled to build the data table of Preisach model parameter. The method of bilinear interpolation is used in the control system. As one controlling unit, Preisach inverse model is integrated in PID closed-loop control system. The experiment is carried out to compare with the classic PID control. The experimental results indicate that the PID closed-loop control system integrated with Preisach inverse model can effectively diminish the effects of the hysteresis nonlinearity and creep. The dynamic response and steady precision of piezoceramic actuator is improved.