Research On Dynamic Performance Of The Driving Device Flexibly Suspended On Frame About High-Speed Motor Car

High-speed railway's development is inseparable from the development of high-speed railway vehicle, and the development of high-speed railway vehicle inseparable from the development of high-speed bogie.Bogie is an important component part of vehicle, plays a important role of bearing,traction, riving,braking and other functions,its structure's rationality is directly determine the vehicle's driving quality,dynamic performance and safety.Presently, the representative of China's high-speed rail is Beijing-Tianjin, Beijing-Shanghai, Wuhan-Guangzhou passenger dedicated line. The types of high-speed railway EMU mainly are CRH1,CRH2,CRH3 and CRH5. Among them, the highest operation speed is the type of CRH3 EMU with a speed of 350km/h.This thesis's research content is to introduce the main structure and characteristics of motor bogies of the 350km/h high-speed EMU according to the existing high-speed train bogie. Driving device flexible suspension structure is introduced in the thesis, the thesis emphatically analyzes the Motor boom by finite element analysis and calculated its stress distribution in different operating conditions and the deflection of the boom in ultimate bearing conditions.It establishes motor vehicle model by useing the SIMPACK multibody dynamics analysis software, This model detailed the structure characteristics of the suspension type of flexible suspension driving motor, especially sets motor and its mounting bracket as an independent components (namely independent quality) and considers specializing in system, meanwhile it will simulates the the suspension components of motor with three direction spring and sets motor absorbers and motor blocks between motor and bogie.It analysis the influence on performance of the EMU from the main parameters of motor's flexible suspension through variable parameter calculation and it also iunderstands the sensitivity of components of the motor car model to the motor suspension parameters. Finally, according to the analysis of the calculation results, it optimizes parameters of the lateral stiffness, vertical stiffness of motor boom and motor shock absorber's damping.Calculate and analysis critical speed,dynamic performance on linear track and the ability to pass curve of the motor car model. In the meanwhile it contrasts the difference between flexible suspension driving motor and rigid suspension driving motor models.The results show that the two models can meet the dynamics of high-speed operation requirements.Compare with rigid suspension driving motor structure model, flexible suspension driving motor structure have the higher linear and nonlinear critical speed. In the model, linear critical speed of the flexible suspension structure model is 825km/h and nonlinear critical speed is 750km/h.Linear critical speed of the rigid suspension structure model is 575km/h and nonlinear critical speed is 460km/h.Flexible suspension driving motor structure has better dynamic performance in straight line.The maximum of the flat stability index Wz at the front of the car for the flexible suspension structure model and rigid suspension structure model respectively is 2.36 and 2.41,the maximum value of the lateral force between the wheel and rail for the first wheelsets is 12.16kN and 13.2kN.There is just a little different between the models with two kinds of structures On the curve.It analysis the influence on performance of the EMU from the main parameters of motor's elastic suspension through variable parameter calculation and it also studies the sensitivity of components of the motor car model to the motor suspension parameters.Finally, according to the analysis of the calculation results, it optimizes parameters of the lateral stiffness,vertical stiffness of motor boom and motor shock absorber's damping,and get the optimization value of above para-meters respectively is 6kN/mm 30kN/mm and 20kN·s/m.