Wheel Profile Design Based on Rail Profile

 Expansion Method

ZHANG Jian ^{1, 2}  WEN Zefeng ¹  SUN Liping ²  JIN Xuesong ^{1, 2}

(1. Traction Power State Key Laboratory, Southwest Jiaotong University, Chengdu 610031;
2. School of Traffic and Transportation, Dalian Jiaotong University, Dalian 116028)

Abstract: Firstly the contact geometry of UIC high-speed wheel/rail profile S1002/UIC60 and Chinese quasi-high-speed profile LMa/CHN60 is analyzed. The analysis result shows LMa/CHN60 profile has too low degree of conformity, which would have detrimental effects on wheel/rail wear and rolling contact fatigue. So, from the view point of altering the rail contact status, rail profile expansion method is researched numerically, and the partial rail profile expansion method is adopted to design wheel profile having higher degree of conformity with Chinese 60 kg/m rail. The vehicle & track coupling dynamics simulation shows that the designed profile has critical speed about 400 km/h, and relatively better curving performance than LMa profile. Finally, the calculation of the wheel/rail elastic non-Herzian rolling contact shows that compared with the LMa profile the contact area, contact stress etc. of the approaching rail side contact have little changes, while the leaving rail side has obvious en-large in contact area and substantial decrease in contact stress, for approximately 20%. This design can enable a broader wheel/rail running band, alter the contact position and frequency, which will mitigate wheel/rail rolling contact fatigue.

Key words: Wheel/rail relationship  Wheel profile design  Wheel/rail contact geometry  Rolling contact  Vehicle & track dynamics

CLC No: U211

国家重点基础研究发展计划 (973计划, 2007CB714702)、铁道部科技研究开发计划 (Z2006-049)、大连交通大学兼职特聘教授研究基金和牵引动力国家重点实验室开放课题资助项目. Received 20070919, received in revised form 20071114

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