Transitions in rolling-sliding wheel/rail contact condition during running-in
Transitions in rolling-sliding wheel/rail contact condition during running-in
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DOI：
10.1016/j.triboint.2019.03.037
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发表时间：
2020-09-01
影响因子：
6.2
通讯作者：
Lewis, R.
中科院分区：
文献类型：
--
作者：
Fukagai, S.;Brunskill, H. P.;Lewis, R.
如果轮轨接触中的牵引系数太高，则轮攀脱轨的风险增加。据观察，这在车轮加工后更频繁地发生。本文研究了在磨合过程中，牵引系数随轮轨接触面变化的规律。使用全尺寸的轮/轨接触试验台和安装在铁轨上的超声阵列换能器进行实验。结果用于确定接触界面的刚度。接触刚度似乎是正相关的牵引系数。由于接触面的共形，接触刚度在牵引系数增大之前先增大。这项工作将允许车轮加工的建议，以帮助减少车轮爬脱轨的问题。
The risk of wheel-climb derailment increases if the traction coefficient in the wheel/rail contact is too high. This has been observed to happen more frequently just after wheel machining. This work investigates how the traction coefficient rises with evolution of the wheel/rail interface during the running-in. Experiments were performed using a full-scale wheel/rail contact rig and an ultrasonic array transducer mounted in the rail. Results were used to determine the stiffness of the contact interface. Contact stiffness appeared to be positively correlated with the traction coefficient. Owing to the conforming of the interface, contact stiffness increases before the traction coefficient rises. The work will allow recommendation of wheel machining to be made to help reduce the problem of wheel-climb derailment.