Basic Theoretical Research And Performance Characteristics Analysis Of Giant Magnetostrictive Actuator

With the rapid development of science and technology,people have increasingly higher requirements on the vibration control accuracy of structures and equipment,and they have put forward stricter and finer requirements on vibration control devices.The emergence and development of new intelligent materials provide a new direction for further improving the performance of actuators.Giant Magnetostrictive Material(GMM)is a kind of intelligent material with magnetron function,which can realize two-way conversion of electric-magnetic-mechanical energy.Compared with piezoelectric ceramics,magnetorheological materials and shape memory alloys,it has the advantages of large expansion and contraction strain,fast response speed,high energy density and high energy conversion efficiency.Actuators developed using giant magnetostrictive materials have the characteristics of simple structure,large output and accurate output.Based on this,this article studies a high performance giant magnetostrictive actuator based on the basic characteristics of giant magnetostrictive materials.The main research work of the thesis includes the following aspects:(1)According to the basic characteristics of giant magnetostrictive materials,the structural design,calculation and analysis of giant magnetostrictive actuators were completed,and the key parameters of the actuators developed were optimized.(2)The finite element model of the giant magnetostrictive actuator is established,which provides a design basis for reducing the magnetic leakage,increasing the magnetic induction intensity and improving the uniformity of the magnetic induction intensity in the GMM rod.The effects of the opening and closing magnetic circuit,the magnetic permeability of the magnetically permeable material,the axial length of the excitation coil and the radius of the magnetic conductor on the magnitude and uniformity of the magnetic induction in the GMM rod were systematically studied,simulated calculation of the transient magnetic induction intensity of the magnetic circuit.Finally,a multi-stage cylindrical permanent magnet arrangement is proposed,which provides a new idea for the design of the actuator.(3)Based on the linear piezomagnetism equation,the dynamic model of the giant magnetostrictive actuator is established,the actuator’s electro-magnetic-mechanical coupling equation is derived,and the transfer between the input current and the output displacement is obtained function,the mechanical characteristics of giant magnetostrictive actuators are analyzed through theoretical calculations.(4)Based on the Boltzmann statistical assumption,the inverse compensation model of the giant magnetostrictive actuator is established,and the simulation calculation is performed to verify the accuracy of the inverse hysteresis model.This model is of great significance for guiding actuator design,overall performance evaluation and real-time control.(5)Completing the active control simulation analysis of the giant magnetostrictive actuator to the three-layer frame structure.The research results show that the actuator developed with giant magnetostrictive materials is suitable for active control of structural vibration and can achieve ideal control results.