Research On The Driving And Precision Control Technology Of Giant Magnetostrictive Actuators

Giant Magnetostrictive Material(GMM),as a new type of precision actuation material,has the characteristics of high energy density,large telescopic amount and fast response speed.Based on the GMM structure,Giant Magnetostrictive Actuator(GMA)is widely used in micro /nano processing manufacturing,precision positioning control,robotics,and micro-electro-mechanical systems.However,GMM exhibits complex dynamic characteristics such as susceptibility to temperature and output hysteresis,which makes GMA response have strong nonlinear characteristics,which makes its model construction difficult,drive control complicated,and the application of GMA drive and its precise control are facing huge challenge.Therefore,investigating its temperature effects,hysteretic behavior characteristics,solving the nonlinear problems of GMA systems,and further improving the control accuracy of actuators have become a hot spot of current research.In this paper,the GMA model and the research status of drive control technology are analyzed in detail,and a set of drive control system is designed by comparing the advantages and disadvantages of various drive control technologies,so as to achieve the expected control accuracy and stability of GMA output.Aiming at the hysteretic characteristics,this paper firstly established the traditional hysteresis model of GMA by applying the theory of Jile-Atheton,and then established the new hysteresis model of GMA by using the time series prediction method based on neural network,and compared the accuracy of the model.In view of the influence of temperature change,the GMM temperature-expansion capability characteristic model is proposed,and the temperature compensation is realized to reduce the output error.Finally,combined with the GMA hysteresis and temperature model,the feedforward compensation control strategy was used to solve the problem of actuator hysteresis nonlinearity.Based on the feedforward compensation,a PID controller was designed,and the controller parameters were dynamically adjusted to achieve GMA high-precision control.Finally,on the basis of summarizing the content of the thesis,the outlook and suggestions for the research direction and further work goals of the field are put forward.