Analysis of Traction Coefficient Subject to Rail Cleaning Effect Based on Tribomachine Measurements

IF 1.5 4区工程技术 Q3 ENGINEERING, MECHANICAL

Experimental Techniques Pub Date : 2023-05-18 DOI:10.1007/s40799-023-00651-3

E. Bernal, D. Camacho, M.L. Rahaman, M. Spiryagin, Q. Wu, B. Sneath, C. Bosomworth, C. Cole

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Abstract

The proper representation of friction contact conditions between each wheel and the rail is necessary to accurately model the behaviour of a heavy haul locomotive since friction conditions at the wheel-rail interface affect the locomotive’s dynamic performance under traction and braking conditions. In normal operations, a phenomenon commonly known as rail cleaning effect occurs. The rail cleaning effect causes increased friction coefficients between the following wheel treads and the rail head. The wheel-rail interaction causes the third body layer to be partly or wholly eliminated from the surfaces in contact and generates new layer. An experimental analysis of the changes in friction coefficients under simulated locomotive wheel-rail contact conditions, in terms of contact pressure and slip, is presented in this paper. For this study, data processing equations are presented to obtain the experimental traction coefficient and slip. Furthermore, the rail cleaning effect is examined under different slip conditions. The experiment shows the traction coefficient increases for a given number of cycles until reaching a steady value, demonstrating that the rail cleaning effect is measurable in various slip conditions on a twin disc machine.

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基于摩擦机械测量的受轨道清洁效应影响的牵引系数分析

由于轮轨界面的摩擦条件会影响机车在牵引和制动条件下的动态性能，因此正确表示每个车轮与轨道之间的摩擦接触条件对于准确模拟重载机车的行为非常必要。在正常运行中，会出现一种通常称为钢轨清洁效应的现象。钢轨清洁效应会导致后轮踏面与轨头之间的摩擦系数增大。车轮与钢轨之间的相互作用会导致第三体层从接触面上部分或全部消失，并产生新的体层。本文从接触压力和滑移的角度，对模拟机车轮轨接触条件下摩擦系数的变化进行了实验分析。在这项研究中，提出了数据处理方程，以获得实验牵引系数和滑移。此外，还研究了不同滑移条件下的钢轨清洁效果。实验结果表明，牵引系数在给定的循环次数内会增加，直至达到稳定值，这表明在双圆盘机的各种滑移条件下，轨道清洁效果是可以测量的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Experimental Techniques 工程技术-材料科学：表征与测试

CiteScore

3.50

自引率

6.20%

发文量

审稿时长

5.2 months

期刊介绍： Experimental Techniques is a bimonthly interdisciplinary publication of the Society for Experimental Mechanics focusing on the development, application and tutorial of experimental mechanics techniques. The purpose for Experimental Techniques is to promote pedagogical, technical and practical advancements in experimental mechanics while supporting the Society''s mission and commitment to interdisciplinary application, research and development, education, and active promotion of experimental methods to: - Increase the knowledge of physical phenomena - Further the understanding of the behavior of materials, structures, and systems - Provide the necessary physical observations necessary to improve and assess new analytical and computational approaches.