考虑轮对弹性的轮轨接触点算法

研究轮对动力学相关问题时要考虑轮对的弹性变形,本文在传统迹线法的基础上发展一种考虑轮对弹性的轮轨接触点计算方法。该方法通过计算滚动圆上的点和该点在轨道上的投影点的法向矢量确定可能接触点,形成接触迹线,根据迹线和轨道型面的垂向最小距离确定最终的接触点。利用该方法,本文建立单轮对刚柔耦合系统动力学方程来求解轮轨接触点,并通过刚性轮对与弹性轮对的计算结果对比,讨论轮对弹性变形对接触点位置和轮轨蠕滑率的影响。结果表明,该方法可有效解决考虑轮对弹性的轮轨接触计算问题。

Algorithm of Wheel-rail Contact Point for Flexible Wheelset

Elastic deformation of wheelset should be considered in research of wheelset dynamics.In this paper,a new wheel-rail contact point searching algorithm used for flexible wheelset simulation was developed on the basis of the conventional wheel-rail contact line method.Normal vectors of a point on each rolling circle and its projection on rail were calculated to find out possible contact points,which formed the wheel-rail contact line.The final contact point was determined by the minimum vertical distance between the contact line and rail section profile.The rigid-flexible coupling dynamic equations of the single wheelset were established and dynamic simulation was made.The impact of wheelset deformation on the wheel-rail contact position and creepage was discussed.Comparison of rigid and flexible wheelsets shows that the new method is effective to solve flexible wheelset and rail contact problems.