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ÖÐͼ·ÖÀàºÅ£ºU270.1 ÎÄÏ×±êÖ¾Â룺A doi£º10.3969/j.issn.1006-0316.2022.10.007

ÎÄÕ±àºÅ£º1006-0316 (2022) 10-0042-09

Effect of Wheel Profile on Rolling Class ¢ñContact Fatigue of Intercity EMU Wheels

LIU Ran£¬LI Yang£¬WANG Hengyu£¬ZHAO Xin

( State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China )

Abstract£ºTo study the effect of wheel profile on class¢ñrolling contact fatigue arising on wheels of intercity EMU (Electric Multiple Units), a comparison test was carried out on one EMU covering a period of wheel re-profiling. The LMA profiles was used for the wheels of the first to fourth vehicles of the EMU and the LM profiles was applied for the wheels of the fifth to eighth vehicles. It was found that there was no rolling contact fatigue damage on the wheels of LMA profiles, but class¢ñrolling contact fatigue occurred on the wheels of LM profiles under the same running mileage. The vehicle dynamics model was developed with SIMPACK and the rolling contact fatigue prediction was conducted through the damage function. The simulating results show that the wheels of leading wheelset on the low rail are easy to generate class¢ñrolling contact fatigue when EMUs pass through the curves especially for sharp curves within the radius of 350~450 m. The fatigue damage peak value of LM wheel profiles is always higher than that of LMA wheel profiles after a mileage of 80,000 km. Considering the wheel wear in the actual service, the phenomenon that LM profiles fatigue occurs but LMA does not can be explained. In addition, the fatigue damage peak value fluctuates with the change of the mileage, which is consistent with the phenomenon that the class¢ñfatigue crack remains stable but does not deteriorate.

 

 

Key words£ºintercity electric multiple units£»wheel profile£»rolling contact fatigue£»vehicle dynamics£»damage function

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