Design And Research Of Giant Magnetostrictive Actuator In Train Active Suspension System

In recent years,with the increasing popularity of high-speed train technology,the increasing speed is accompanied by the increase of fatigue stress of the car body,which not only affects the passenger's ride experience,but also increases the danger,which adversely affects the safety and stability of high-speed train operation.As the core of train vibration reduction,the suspension system will play a key role.The traditional suspension system can not take into account the ride comfort and stability of the vehicle,and the active suspension system can produce adjustable active control force.A magnetostrictive actuator(Giant-Magnetostrictive-Actuator,GMA)as a train An important component of active suspension system,the output force directly affects the damping effect of suspension system and its application in high speed train.Aiming at the problems existing in the traditional electric actuator,a new type of super magnetostrictive material(Giant magnetostrictive material,GMM)is used to design a actuator with large detection depth range,small residual vibration,wide frequency band and larger output force.First of all,the causes of vehicle vibration are systematically analyzed,and the research progress of several suspension systems for train actuators is introduced,and the scheme of applying GMA to train active suspension system is put forward.On the basis of studying the mechanism and GMA working principle of rare earth-ferromagnetic telescopic material,the coupling relation of magnetic machine is deduced,and the size,working parameters,magnetic circuit and prestress of GMM rod in GMA are designed.In the design of bias magnetic field,the improved arrangement of permanent magnet is adopted to improve the efficiency of bias magnetic field.In the magnetic circuit design,the maximum output displacement of the actuator is first set,and then the magnetic circuit is optimized,and finally the actuator is obtainedFirst of all,the causes of vehicle vibration are systematically analyzed,and the research progress of several suspension systems for train actuators is introduced,and the scheme of applying GMA to train active suspension system is put forward.On the basis of studying the mechanism and GMA working principle of rare earth-ferromagnetic telescopic material,the coupling relation of magnetic machine is deduced,and the size,working parameters,magnetic circuit and prestress of GMM rod in GMA are designed.In the design of bias magnetic field,the improved arrangement of permanent magnet is adopted to improve the efficiency of bias magnetic field.In the magnetic circuit design,the maximum output displacement of the actuator is first set,and then the magnetic circuit is optimized,and finally the structure size suitable for the actuator is obtained.Secondly,the finite element simulation and magnetic field analysis of the super magnetostrictive transducer are carried out.The three-dimensional simulation analysis of thetransducer is carried out to study the influence of the thickness of different conductive disks on the magnetic field distribution in the rare earth telescopic rod,and the influence of the eddy current effect on the axial radial magnetic field distribution of the telescopic rod at different excitation frequencies.Lastly,on the basis of analyzing the working principle of active suspension,the mathematical model GMA in active suspension is established,the active suspension model of GMA/ train is built in Matlab/Simulink,the fuzzy PID control mode is optimized by genetic algorithm,and the control block diagram of actuator is simulated and analyzed,which is compared with PID control effect of ordinary genetic algorithm.By simulation and comparison,it is shown that the method of optimizing fuzzy PID controller parameters based on genetic algorithm can effectively improve the control effect.