Study On Vibration Characteristics And Active Vibration Reduction Of Traction Transmission System Of High Speed Train

Traction transmission system of high-speed train is an electromechanical coupling system with complex structure,many nonlinear factors and abundant internal and external excitation.High-power three-phase asynchronous motor used in high-speed train traction system is a high-order,strongly coupled,nonlinear multivariable system,and the gear transmission system is also a mechanical system with rich internal excitation and nonlinear factors.In order to more accurately and systematically reflect the vibration response of high-speed train under different operating conditions,it is necessary to conduct system-level dynamic response analysis of the traction transmission system of high-speed train.Based on the 200 km/h emu traction "Renaissance" China standard transmission system as the research object,traction drive system electromechanical coupling simulation model is established,on the stage of starting and accelerating,rated conditions,braking mode of the vibration acceleration are analyzed,and put forward based on the immunity control current compensation strategy of active control method of vibration suppression.Through active control of current compensation,the amplitude of vibration acceleration of the gear transmission system is reduced,and better vibration suppression effect is achieved.Firstly,according to the coupling relationship between the electrical system and the mechanical system of the high-speed train traction transmission system,a dynamic model of the gear system with multiple internal excitation and a dynamic model of the three-phase asynchronous motor with rotor flux oriented vector control were established,and an electromechanical coupling simulation model was built on the Simulink platform.Secondly,the dynamic response of the coupling system from the start of the motor to stable operation is analyzed.The results show that the electrical system contains harmonic content of various components.When additional harmonic torque is applied to the coupling system,the harmonic amplitude of vibration acceleration and gear meshing force further increases,indicating that the increase of external interference will aggravate the vibration of the system.Finally,a current compensation strategy based on ADRC is proposed.The speed difference between the motor shaft and the pinion input shaft is taken as the input of the controller,and the current compensation calculated by the controller to estimate the internal and external disturbance is superimposed into the motor control module.The results show that the active vibration suppression method can play a good vibration suppression effect in both rated and braking conditions,and the vibration suppression effect is better in the braking instantaneous.