Study On Structure And Key Parameter Of EMU Bogie Considered Flexible Of Bogie

Electric multiple units is different from ordinary vehicle in its high speed. With speed increasing, the dynamic excitation between wheels and rails increases and the excitation frequency of the train increases. Therefore some new problems generate, such as wheel wear and noise, wheel out of round, deterioration of the track structure, severe hunting oscillation and so on.The CRH380A and the CRH380B are main high-speed EMU types of China, independent innovated and designed on the CRH2 and CRH3 EMU respectively. The design difference of the Japanese and the German on bogie wheel-rail contact and suspension parameter is kept on both EMUs. The low conicity tread is used on CRH2 while large conicity tread is used on CRH3. The big difference also exist on key parameter of two EMUs, such as stiffness of axle box rubber node, stiffness and damp of anti-yaw damper, stiffness and damp of lateral damper and so on.The design concept of EMU bogie is directly reflected on the matching relationship between wheel and rail. The different matching relationship between wheel and rail of two EMUs leads the difference of key suspension parameter design. So it is necessary to research the matching law between wheel-rail contact and suspension parameter.The main job of this paper includes:(1) The math model of characteristics of hydraulic shock absorber, vertical nonlinear characteristics of airspring and motor with a lateral degree is introduced. The rigid-flexible coupling dynamic model is established by MBS and FEM software, in which the flexible of frame is considered.(2) The dynamic performance difference of rigid frame, flexible frame with pipe transom, flexible frame with box transom is analyzed. The analysis results show that the dynamic performance offlexible frame with box transom is better.(3) The effect law of primary position stiffness, characteristics of anti-yaw damper, stiffness and damping ratio of motor suspension and characteristics of secondary lateral damper on linear and nonlinear stability of two types of vehicle with S1002CN and LMA tread is analyzed.(4) The effect law of characteristics of secondary lateral damper, characteristics of anti-yaw damper and stiffness and damping ratio of motor suspension on ride quality of two types of vehicle with S1002CN and LMA tread is analyzed.