Wheel-rail contact is a link between the vehicle system and the rail system, and the contact processing approach affects accuracy of vehicle dynamic simulation. Contact detection is usually the start of wheel-rail contact calculation, and detecting precision of contact patch center affect accuracy of contact force calculating results, therefore it is significant to improve detecting precision of contact patch center. An alternate search method (ASM) and an extended trace line method are proposed to improve precision and efficiency of contact patch centers detection. The proposed alternate search method applies Golden Ratio Search Method and variable intervals between grids to detect contact patch centers. To make the detected contact patch centers match rail tangential directions better, an extended trace line method is constructed based on geometrical constraints between contact points and rail tangential directions. Dynamic simulations of a bogie vehicle formed by two wheelsets and a bogie frame negotiating a rail curve are conducted to evaluate effects of the proposed methods. Calculating times of the proposed methods for finishing the simulations are compared to explain computational efficiencies of the different methods. The proposed approaches are real-time capable and can be used for vehicle dynamics simulations.

中文翻译：

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轮轨接触面中心检测的替代搜索法和扩展追踪线法


轮轨接触是车辆系统与轨道系统之间的纽带，接触处理方式影响着车辆动态仿真的精度。接触检测通常是轮轨接触计算的开始，接触面中心的检测精度影响接触力计算结果的准确性，因此提高接触面中心的检测精度具有重要意义。提出了替代搜索方法（ASM）和扩展跟踪线方法来提高接触斑中心检测的精度和效率。所提出的替代搜索方法应用黄金比例搜索方法和网格之间的可变间隔来检测接触补丁中心。为了使检测到的接触斑中心更好地匹配钢轨切线方向，基于接触点与钢轨切线方向之间的几何约束，构造了一种延长追踪线方法。对由两个轮对和转向架框架组成的转向架车辆通过轨道曲线进行动态仿真，以评估所提出方法的效果。比较所提出的完成模拟的方法的计算时间，以解释不同方法的计算效率。所提出的方法具有实时能力，可用于车辆动力学仿真。