应用于高速轮轨滚动接触的蠕滑理论算法对比研究

运用多体动力学仿真软件UM建立了车辆-轨道多体动力学模型，并基于轮轨滚动蠕滑理论对比分析了FASTSIM算法与CONTACT算法两者在稳态和瞬态滚动状态中轮轨动态作用力之间的差异.计算结果表明:列车以稳态滚动状态行驶在直线轨道和曲线轨道上时通过FASTSIM算法计算得出的横、纵向轮轨蠕滑力与CONTACT算法的计算值存在的差异值较小，达到了10%~15%，而在瞬态滚动状态下尤其是在大蠕滑以及考虑风阻等比较恶劣的工况下行驶时计算得出的横、纵向蠕滑力与CONTACT算法的计算值存在较大的误差，差值达到了25%，并且随着车速的增加，最大差异值达到了30%，这表明CONTACT算法在瞬态滚动工况下进行蠕滑力计算上相比于FASTSIM算法更加精准，更适用于作出对列车运行时的安全性方面的评价. 

Comparative Study on the Theory of Creeping Theory Applied to High Speed Wheel-Rail Rolling Contact

The multi-body dynamics simulation software UM was used to establish the vehicle-orbit multi-body dynamics model. Based on the wheel-rail rolling creep theory, the dynamics of the wheel-rail dynamics between the FASTSIM algorithm and the CONTACT algorithm in steady state and transient rolling state were analyzed the difference between forces. The calculation results show that the difference between the horizontal and vertical wheel-rail creeping force and the calculated value of the CONTACT algorithm by the FASTSIM algorithm when the train was traveling in a steady-state rolling state on a linear or curved track was low (10% to 15%).The calculated horizontal and vertical creep force and the calculation value of the CONTACT algorithm were large when driving in transient rolling conditions, especially in the case of large creep, air resistance and other severe working conditions, the difference reached 25%, and with the increase of the speed, the maximum difference reached 30%. It shows that the CONTACT algorithm was more accurate in calculating the creep force under transient rolling conditions than the FASTSIM algorithm, and was more suitable for making safety evaluations on train operation.