Research on Fatigue Strength and Influence Factors of EMU Cooling Air Ducts
In order to study the fatigue strength and influence factors of the cooling air duct for EMU traction motor,the load transfer relationship between the stress at the cooling duct measurement point and the external load was established by simulation analysis method,and the cooling air load spectrum in the cooling air duct and the weld gauge stress spectrum in the cooling air duct were obtained through the line test,and the fatigue performance of the cooling air duct was studied.The data analysis results show that the maximum value of the cumulative damage of the cooling duct measurement point is 0.925,which meets the requirements of EN 1999-1-3-2007.Among them,the cumulative damage to the structure caused by the cooling air load generated by the low-speed and high-speed conversion of the cooling fan accounts for 88.7%to 99.8%of the total damage,and the cumulative damage per thousand start-stop is 0.022 7 to 0.031 0.The influence coefficient of the cooling air load inside the cooling air duct is 0.75-0.90,and the cooling air load is the main factor affecting the strength of the air duct,which needs to be paid attention to during the design process.
the cooling air loadcooling air duct of the EMUload transfer matrixfatigue strengthdynamic stress
NETL
NSTL
万方数据
维普
