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CHA Hao, REN Zun-song, XU Ning. Impact characteristics of axle box bearing due to wheel flat scars[J]. Journal of Traffic and Transportation Engineering, 2020, 20(4): 165-173. doi: 10.19818/j.cnki.1671-1637.2020.04.013
Citation: CHA Hao, REN Zun-song, XU Ning. Impact characteristics of axle box bearing due to wheel flat scars[J]. Journal of Traffic and Transportation Engineering, 2020, 20(4): 165-173. doi: 10.19818/j.cnki.1671-1637.2020.04.013
shu

Impact characteristics of axle box bearing due to wheel flat scars

doi: 10.19818/j.cnki.1671-1637.2020.04.013
  • 1.

    School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China

  • 2.

    Zhuzhou CRRC Times Electric Co., Ltd., Zhuzhou 412001, Hunan, China

Funds:

National Natural Science Foundation of China 11790281

National Natural Science Foundation of China 51575036

National Key Research and Development Program of China 2016YFB1200506-21

More Information
  • Author Bio:

    ZHA Hao(1991-), male, doctoral student, 14116362@bjtu.edu.cn

    REN Zun-song(1969-), male, professor, PhD, zsren@bjtu.edu.cn

  • Received Date: 2020-02-21
  • Publish Date: 2020-04-25
    Abstract
  • Taking CRH2 EMU as the research object, the vehicle-track dynamics analysis model including bearing was established. The time histories of wheel-rail impact force, the vibration accelerations of wheelset and axle box, and the contact load between roller and outer ring raceway were obtained by the numerical integration. Combined with the existing wheel flat scar analysis model, the influences of flat scar length and vehicle running speed on wheel-rail impact force were researched. The vibration acceleration response characteristics of wheelset and axle box under flat scar impact, and the contact load response characteristics of outer ring raceway were studied. Research result shows that the impact accelerations of wheelset and axle box increase with the length of flat scar. The impact acceleration of axle box is larger than that of wheelset, and increases faster. The wheel flat scar can affect the contact load of outer ring raceway. In the bearing area of the raceway, when the wheel enters the flat scar area, the effect of the impact load is to reduce the contact load of the outer ring of the roller. When the wheel leaves the flat scar area, the effect of the impact load is to increase the contact load of the outer ring of the roller. In the non-bearing area of the raceway, the roller and the outer ring also have multiple impacts. At 300 km·h-1, when the length of the flat scar is less than 30 mm, the impact load on the outer ring of the roller entering the flat scar area is greater than that on the outer ring of the roller leaving the flat scar area. When the length of the flat scar is longer than 30 mm, the impact load on the outer ring of the roller entering the flat scar area is less than that on the outer ring of the roller leaving the flat scar area. In the whole raceway area, the impact load of the raceway caused by wheel flat scar is symmetrical distribution, and the closer the raceway area is to the symmetrical axis, the greater the impact load is.

     

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