道岔区固定辙叉心轨垂磨对轮轨动态接触的影响

Effect of Vertical Wear of Unmovable Frog Nose Rail on Dynamical Wheel-Rail Contact in Turnout Zone

摘要:

通过实测数据和文献资料，分析了辙叉区心轨垂直磨耗分布规律，并基于该规律构造了各级垂直磨耗分布曲线。针对重载条件下普速铁路60 kg?m^-1钢轨12号单开道岔，基于车辆-道岔耦合动力学的理论，建立重载货车-道岔耦合动力学模型，计算分析了固定辙叉心轨垂直磨耗对重载货车通过道岔辙叉区轮轨接触的影响规律。结果表明：心轨顶宽20~40 mm范围是实测心轨垂直磨耗较为严重的区域；随着心轨垂直磨耗量的增大，轮载过渡区轮轨接触力最大值和接触力过渡曲线波动性普遍增大，轮轨接触关系随之恶化，心轨与翼轨之间的轮载过渡平稳性随之下降；当轨道几何不平顺较为良好时，心轨顶宽40 mm处垂磨应控制在5 mm之内。

Abstract:

The distribution law of the vertical wear of frog nose rail is analyzed based on test data and literature， and the vertical wear profile of the frog nose rail in each level were created according to this distribution law. Aimed at the 60 kg?m^－1 rail No.12 single open turnout of ordinary railway， a heavy haul train-turnout coupled dynamical model was established based on the theory of vehicle-turnout coupled dynamics to calculate and analyze the influence of the vertical wear of the frog nose rail on dynamical wheel-rail contact in frog area when the heavy haul train passes through the turnout. The results show that the region where the top width of the nose rail is 20-40 mm is the region where the vertical wear is more serious. With the increase of the vertical wear of the frog nose rail， the maximum of wheel-rail contact force in the wheel load transition area and the volatility of contact force curve in the transition area generally are increased， even the wheel-rail contact relationship is deteriorated， and the smoothness of the wheel load transition between the nose rail and the wing rail is decreased. When the track geometric irregularity is good， the vertical wear of the frog nose rail top width of 40 mm should be controlled within 5 mm.