Analysis of influence of vehicle environment on temperature of high speed railways axle box bearing
A power loss model considering the heat dissipation of the axle box surface and the heat transfer inside the bearing was constructed,and the load of the axle box bearing in different service environments was analyzed.Considering the influence of convective heat transfer by air flow field on the surface of the axle box,a refined temperature model of the axle box bearing was established to analyze the influence of different service environments on the temperature distribution and temperature characteristics of the axle box bearing,and the validity of the model was verified by bearing test bench.The results show that when the vehicle speed increases from 220 km/h to 300 km/h,the bearing friction torque increases by 11.4%,and the wheel polygon order increases from 16 to 22,the friction torque increases by 2.8%on average.The highest temperature of the axle box bearing appears in the contact area between the inner ring and the rolling body,and the lowest temperature appears on the shaft and is close to the ambient temperature.When the speed increases from 220 km/h to 300 km/h,the maximum temperature of the bearing increases by 9.2℃,and the temperature at each node increases to a certain extent.When the polygon order of the wheel increases from 16 to 22,the maximum temperature increases by 1.1%on average,and when the polygon depth amplitude increases from 10 dB to 18 dB,the maximum temperature increases by 1.4%on average.
axle box bearingvehicle-track coupling dynamics modelbearing temperature fieldfinite element
万方数据
维普
