Study on Identification Method of Universal Joint Shaft Fault at the Motor End of Train
The cardan shaft transmission structure of EMU is the power transmission device of the bogie power transmission system.The dynamic unbalance of cardan shaft is the key to ensure the running quality and safety of high-speed trains.In order to solve this problem,a vibration monitoring method for the dynamic unbalance of the motor of the universal shaft is proposed.Firstly,the early-warning parameters are explored through long-term line tracking experiments,and then the vibration early-warning model in time and frequency domains is established.At the same time,through the finite element simulation analysis,the vibration characteristic quantity relationship between the faulty cardan shaft and the normal cardan shaft is simulated,and the vibration characteristic quantity of the faulty cardan shaft is obtained by the statistical analysis of a large number of real vehicle data.Finally,the vibration characteristics obtained are used to set the fault threshold of the cardan shaft,establish the fault identification standard of the cardan shaft,and propose the online fault identification method of the cardan shaft.The proposed fault discrimination standard and identification method are verified by using the vibration data of real vehicle fault cardan shaft.The results show that the cardan fault criterion based on statistical quantitative analysis of real vehicle data and qualitative analysis of simulation can accurately identify the fault cardan shaft within reasonable discrimination threshold,and the identification method proves effective,which holds practical engineering application value.
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