Research Of Train Active Vibration Damping Simulation Based On Giant Magnetostrictive Actuator

The rapid development of high speed vehicles provided a lot of convenience for people to travel, and laid a solid foundation for the formation of economic regionalization. At the same time, the increasing vibration of the vehicle structure also cause a series of adverse effects.To improve the steering frame properties of the active control method is one of the main way to solve the problem. Therefore, the active suspension control system research has important research value of the suspension system and will also become the main direction of development of the suspension system in the future.With the problem of complex structure, larger energy consumption and poor vibration damping effect for active suspension in traditional actuation, this theatise uses a new type of intelligent magnetostrictive telescopic as actuator for active suspension system to reache on the vehicle vibration suppression control, improve vehicle stability and ride comfort, at the same time, the subject also has important significance on extending vehicle components and track subgrade of the service life, reducing the impact on the surrounding environment.Firstly, the source of vehicle vibration is analyzed systematically, and the track irregularity in time domain is transformed into the track irregularity by using the discrete Fourier transform method. On the other hand, the working mechanism, performance requirements and structure design of the giant magnetostrictive actuator are studied. On the basis of the analysis of the vertical vibration principle of the vehicle and the telescopic characteristics of the giant magnetostrictive actuator, the vertical vibration model of the 6-DOF vehicle and the dynamic model of the giant magnetostrictive actuator are established respectively.Secondly, as the basis for structure design of force generator for vehicle active suspension on the proposed GMA, using the sub structure method based on frequency response function of the actuator and coupling suspension system model, revealing coupling and parameters the matching relationship between the giant magnetostrictive actuator actuating law and vehicle vertical vibration; for power output control model and displacement output control model of 6-DOF vehicle active suspension model were used to analyze the dynamic model for the dynamic of the giant magnetostrictive actuator, the giant magnetostrictive actuator can satisfy the demands of vehicle active suspension active force requirements, but can not meet the requirements of displacement, therefore this chapter designed transient reaction amplification mechanism of giant magnetostrictive actuator to ensure the magnification of the meet the giant magnetostrictive actuator using in vehicle active suspension.Finally, the displacement amplification mechanism and the giant magnetostrictive actuator model are combined to study the effect of different magnification on the control effect of the giant magnetostrictive actuator. And displacement magnifying mechanism with giant magnetostrictive actuator model connection in the model of vehicle active suspension, in MATLAB / Simulink is built vehicle active suspension control model based on giant magnetostrictive actuator, through the comparison and analysis of simulation of active suspension and passive suspension of vehicle vibration response control of the situation, verified the giant magnetostrictive actuator for vehicle active suspension and the vehicle vertical to the vibration suppression effect.