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首页> 外文会议>29th Leeds-Lyon Symposium on Tribology Sep 3-6, 2002 University of Leeds, UK >Progression of the stick / slip zones in a dry wheel-rail contact: Updating theories on the basis of tribological reality
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Progression of the stick / slip zones in a dry wheel-rail contact: Updating theories on the basis of tribological reality

机译：干燥的轮轨接触中的粘着/滑移区域的进展：根据摩擦学实际更新理论

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摘要

At present, optimizing control of maximum wheel-rail adhesion, from the anti-skidding systems piloting" the sliding and the rolling speeds of locomotives, is done on the basis of the wheel-rail contact models available in the literature. Improved accuracy of power train control has highlighted the limits of this optimization technique since the contact conditions of the models, i.e. the stick / slip zones, do not take into account the physical phenomena involved, although they are hardly known. To attenuate this difficulty, the recent works presented in this paper, allow describing the tribological reality of a wheel-rail contact, i.e. the progression of the stick / slip zones. This reality is achieved thanks to monitoring the changes in the the characteristics of the third body present between wheel and rail. The results of tests under initial condition show that there is a correlation between the progressions of the third body flows and that of the adhesion for the various phases of the adhesion-sliding curve. Therefore activation of the internal flow of third body is in fact the physical manifestation of the theoretical condition of stick. On the other hand, the activation of the internal source and recirculation flows of the third body are the physical manifestation of the theoretical condition of slip. This tribological reality therefore allows us to update the theoretical stick / slip conditions and by consequence, anti-skidding systems.
机译：目前，基于文献中提供的轮轨接触模型，通过控制机车的“滑动和滚动速度”的防滑系统来优化最大轮轨附着力的控制。火车控制凸显了这种优化技术的局限性，因为模型的接触条件（即粘着/滑移区域）虽然考虑得很少，但并未考虑所涉及的物理现象。在本文中，允许描述轮轨接触的摩擦学真实性，即粘着/滑移区域的进程，这种真实性是通过监视车轮和铁轨之间第三个车身特性的变化而实现的。初始条件下的测试结果表明，第三体流的进程与各个阶段的附着力之间存在相关性。粘着滑动曲线。因此，激活第三体的内部流动实际上是杆的理论状态的物理表现。另一方面，内部源的激活和第三体的再循环流是滑移理论条件的物理表现。因此，这种摩擦学现实使我们能够更新理论上的粘着/滑移条件，从而可以更新防滑系统。

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