Fatigue Reliability Research And Structure Optimizing For Bogie Frame Of Standard EMU

ABSTRACT:In order to uniformize, standardize and serialize the high-speed train, which means try to make the components as interchangeable as possible, China has begun to research and develop "China national standardized EMU" with independent intelligent property right and comprehensive standard of operating high-speed train since2014, for the goal of improving the quality of development of high-speed train in China. Meanwhile, with the increasing of speed and trainload of EMU, the security and stability of the train has drawn more and more concern from Ministry of Railway as well as from engineers.The fatigue of locomotive bogie overshadows others because it produces fatal impact on carrying capacity of a train.Therefore, it is necessary to analyze the fatigue reliability of bogie frame which is being designed to ensure the security and stability of EMU.In this thesis, the fatigue strength, fatigue life and damage analysis of the bogie frame of350km/h-class standard EMU has been calculated using finite element analysis software ANSYS according to existent standards UIC615-4, EN13749and BS7608.The fatigue strength of local details of welded joint of the frame has been evaluated according to regulations DVS1612and EN15085to compare the method mentioned in these2regulations.The test-procedure-load spectrum of the frame of350km/h-class standard EMU has been established by analyzing the long-term experiment data of the bogie of CRH380BL EMU, which belongs to the family of the standard EMU; then the fatigue reliable analysis has been executed using the obtained load spectrum, including the calculation of fatigue damage of the frame based on both the standard IIW and the procedures BSI and the comparison of the results from the calculation and the damage calculated based on UIC standard load.The local structures shape of the positioning boom stand and the gear boxes Hangers which suffer both from the dynamic stress concentration and high stress amplitude has been optimized and their fatigue after optimization has been analyzed. In addition, the modal analysis has been executed for the bogie frame.The analysis and results above will provide informative reference for the design of locomotive bogie of the EMU and for the standardization-which satisfies the operating condition in China-of both the fatigue strength and the bogie load spectrum of350km/h-class high-speed train.