Research On The Modeling And Control Methods Of Piezoelectric Actuator

With the continuous development of MEMS(microelectronic mechanical system)technology,micro and nano operation has become one of the key topics of concern in the field of scientific research.The micro operation technology is combined with the technique of precision instruments,a comprehensive control engineering,computer technology is very strong discipline,this technology not only can realize nano mechanical components on the operation,but also can realize the biology on cells or molecules operation.The operation of cell level operating objects,such as moving,picking up and cutting,that is the focus of the research in the field of nanoscale operation.The research object of the paper is the actuator of the piezoelectric ceramic,which is the driver in the operation process.Piezoelectric ceramic is a new type of functional material,which has the advantages of quick response speed,high control precision,high driving force and light volume.In the paper,in view of the material characteristics of piezoelectric ceramics,the piezoelectric effect,piezoelectric crystal and other knowledge,which can be analyzed and introduce.Because of the characteristics of piezoelectric ceramic actuator has hysteresis,creep and temperature characteristics of materials,this paper expounds the causes of hysteresis,and the electrostrictive effect,ferroelectric effect and inverse piezoelectric effect of three aspects of a comprehensive analysis of the characteristics of the reason.The hysteresis nonlinearity of the piezoceramic actuator itself is the main factor affecting the accuracy of the system,so the hysteresis nonlinearity is modeled and analyzed.In the paper,the Bouc-Wen model and the Duhem model are selected as the prototype of the hysteresis model of the piezoceramic actuator,and the two models are respectively modeled and analyzed.For the Bouc-Wen model,the simplified system equations are analyzed and the corresponding model parameters are obtained according to the input curve of the system.For the Duhem model,the Weierstrass first approximation theorem is used to identify the parameters of the model and further obtain the parameters.Piezoelectric ceramic actuators require higher dynamic response performance.In order to meet the system requirements,fuzzy PID control method is chosen as the control method of the system,and the membership functions and fuzzy setting rules of the control method are further determined.To verify the feasibility of the method,a simulation model was built up using Simulink tool controller,and the step signal,sine wave and triangular wave response curve as the input signal observation system,compared with the actual output curve.The results show the actual output results coincide with the simulation results of objective image,pressure piezoelectric ceramic actuator application the successful modeling of the fuzzy PID control method.