The Parameter Optimization Research Of Metro Vehicle Drive System Under Random Vibration

The metro vehicle drive system, which includes the traction motor, the gear transmission system, the corresponding transmission system and the wheels, converts electric energy into mechanical torque, and transfers it to wheels, and generates traction force.The vibration of the motor is affected seriously by the rail irregularities and drive system itself incentive. In practical use, it flaws in the motor suspension frequently, which results in that the motor can’t work normally, even more cause "locomotive fault". Although technicians have already done a lot of researches on drive system, sometimes, it still can’t work normally. Therefore, it is very urgent and important to do further researches on the drive system of metro vehicle.Firstly, combine the vehicle system dynamics with the gear system dynamics to establish the coupling mathematical model. In order to establish the gear dynamic model, it needs to work out the time-varying stiffness of dynamic meshing of gears by the Transient Dynamics Simulation. Then input it into the Torsion spring in the ADAMS/Rail. Take B-type vehicle of the Beijing Metro for example, we establish the metro vehicle simulation model with the gear system dynamics model by the multi-body dynamics simulation software.Secondly, the vibration of the motor is simulated primarily in the circumstances of the curved track, AAR5track and the straight-line track, and analyses the reasons.Finally, by changing the stiffness and damping parameters of the motor suspension, conduct simulations with the aim that reduces the vibration acceleration of the motor by ADAMS/Rail. By changing the vertical suspension stiffness and damping, it is relatively reasonable to choose the larger stiffness4×107N/m and the damping1.2X106N·s/m. By changing the lateral suspension stiffness and damping, it is relatively reasonable to choose the stiffness4×105N/m and the damping4×103N·s/m. By changing the longitudinal suspension stiffness and damping, it is relatively reasonable to choose the stiffness4×105N/m and the damping1.2×104N·s/m. Ensure smooth index after optimizing the motor suspension parameters.