Structural Optimization And Hysteresis Modeling Analysis Of Giant Magnetostrictive Actuator

Giant magnetostrictive actuator(GMA)has the advantages of fast response,large strain and large output force.The ability to convert between electromagnetic and mechanical or electromagnetic information and mechanical displacement information is an important drive element for micro-displacement drives,hydraulic components and vibration control.However,the giant magnetostrictive actuator has hysteresis nonlinearity,which makes it difficult to apply the giant magnetostrictive actuator.Therefore,the optimization of GMA and its hysteresis nonlinear modeling are of great significance both in theory and practical engineering applications.In this paper,the giant magnetostrictive actuator is used as the research object,and the design of the preloading stress device,the temperature compensation system and the magnetic field is optimized and analyzed.ANSYS finite element software software for pre-pressure device and modal analysis,to find the working range of the drive;and then analyze the temperature compensation device cooling performance,temperature compensation device has a good cooling effect.Then,the mathematical model of magnetic circuit is established and simulated by finite element method.The results show that the proposed magnetic circuit model is accurate.Finally,the GMA hysteresis model is established,and the output model of GMA is established based on J-A model.The results show that the design of the new preloading stress device to withstand the maximum stress of 955 MPa,the first order resonant frequency of 269.46Hz,less than GMA,will not have an impact on the GMA.When the temperature compensation device is used,the maximum temperature of the GMM rod is 65.369?.When the temperature compensation system is used,the temperature is maintained at 23.753?,which indicates that the designed system has good cooling performance.When the driving coil is only the magnetic flux density distribution The maximum magnetic flux density is 6.11e-4T.When the magnetic flux is distributed uniformly at both ends of the GMM rod,the magnetic field distribution is obviously uniform and the maximum magnetic flux density is 6.11e-4T.When the sleeve is formed into a closed magnetic circuit,GMA The maximum magnetic flux density is increased to 6.77e-3T,which indicates that the magnetic field structure of the designed magnetic field is high.Based on the JA model,the equivalent mechanical model is established.Under the action of the excitation magnetic field,the GMA output displacement changes with time,The hysteresis nonlinearity of GMA is effectively simulated.The influence of different polarized magnetic field intensity,saturation magnetization and external equivalent mass,stiffness and damping factors on GMA output performance is analyzed.When the bias magnetic field increases,Value decreases,when the saturation magnetization,external equivalent mass,stiffness,damping increase will cause hysteresis loop area decreases.