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.

正确表示每个车轮和轨道之间的摩擦接触条件对于准确模拟重载机车的行为是必要的，因为轮轨界面处的摩擦条件会影响机车在牵引和制动条件下的动态性能。在正常操作中，会发生一种通常称为轨道清洁效应的现象。钢轨清扫作用使后轮踏面与轨头之间的摩擦系数增大。轮轨相互作用导致第三体层从接触表面部分或全部消除并产生新层。本文介绍了模拟机车轮轨接触条件下摩擦系数变化的实验分析，包括接触压力和滑移。对于这项研究，提出了数据处理方程以获得实验牵引系数和滑移。此外，还考察了不同滑动条件下的钢轨清洁效果。实验表明，对于给定的循环次数，牵引系数会增加，直到达到稳定值，这表明在双盘机器上的各种滑动条件下，轨道清洁效果是可测量的。