Research In Hysteresis Nonlinear Modeling And Compensation Control Of Piezoelectric Ceramics

Today,nanotechnology has become the mainstream trend of world science and technology.Piezoelectric ceramics have made great contributions to scientific research in various fields due to their nanometer level accuracy.The inherent hysteresis nonlinearity of the piezoelectric ceramic becomes more and more restricts to its wider application.Especially in the high precision requirements,experts and scholars at home and abroad continue to study the control strategies that can solve the problem of hysteresis nonlinearity.All the studies can be divided into two aspects: hysteresis nonlinear modeling and Two aspects of control system design.In the aspect of modeling,this paper puts forward a method based on the internal mechanism modeling of piezoelectric ceramic for the key problems of the piezoelectric ceramic hysteresis nonlinear classical modeling.The model parameters are less and easy to be studied.The functional relationship between the physical quantities in the internal mechanism of the piezoelectric ceramics is synthesized,especially the complete description of the hysteresis nonlinearity of the piezoelectric ceramics,including the ferroelectricity,the rate dependence and the creep characteristics,which are all verified in the first part of the simulation.In the design of control system,this paper first obtains the inverse model corresponding to the hysteresis nonlinear model according to the matching theory,and designs the feedforward inverse compensation control system.After the system simulation verification,in order to further improve the control precision,this paper also designs the internal model PI control system based on the inverse compensation.The simulation results show that the design of the system is designed.The system has completed the high-precision control of piezoelectric actuator,and solved three kinds of shortcomings in the past control system.In the experimental verification,the stack type piezoelectric ceramic actuator is selected as the control object,and the experimental platform of the German dSPACE1103 as the core of the system is built.Collecting experimentaldata and adjusting parameters of the system will ultimately achieve a high precision linear output of the controlled object.The experiment shows that the control method proposed in this paper has good stability and anti-interference to the actual control object,and can effectively reduce the influence of the hysteresis nonlinearity of the piezoelectric ceramics,so as to achieve the high precision positioning and tracking control target of the piezoelectric ceramic objects.