函数型等效锥度驱动的凹磨车轮经济性镟修理论及方法研究

中国高铁大规模运营，车轮凹磨问题成为列车安全平稳运行及轮轨维护成本的主要影响因素，车轮镟修作为最直接有效维护措施而备受关注。项目结合典型线路轮轨服役特性数据库，统计车轮凹磨特征，提出车轮凹磨函数构建方法及凹磨评估策略；分析凹磨廓形局部变化与非线性轮轨接触的耦合关系，结合轮轨滚动接触的Archard磨耗方程及磨耗长效迭代机制，揭示车轮凹磨产生机理；研究典型轮轨匹配副输入的判别策略，设计非线性因子并构建凹磨车轮的函数型等效锥度模型，结合轮轨滚动接触理论，揭示函数型等效锥度与列车运行稳定性的耦合规律，建立驱动凹磨车轮镟修判定方法；基于曲线理论研究凹磨车轮镟修廓形的三次NURBS曲线数学模型，结合等效锥度阈值区间及凹磨规律，构建多轮对副的凹磨车轮廓形集经济性镟修方法并试验验证。预期成果能够完善轮轨关系理论并改善车轮镟修技术、延长车轮服役寿命及保障列车经济安全运行提供科学理论和实践方法。

With the large-scale operation of the high-speed railway in china, the problems of hollow worn wheels have become the main factors that affect the safety and stability of high-speed train and wheel-rail maintenance costs. As the most economical and direct maintenance measure, wheel re-profiling has attracted the attention of many scholars. Integrated with the database of wheel-rail service characteristics on typical line, counting the characteristics of hollow worn wheels, the function construction methods of hollow worn wheels of whole train and evaluation strategy of hollow wear were established. By analyzing coupling relationship between local profile variation of hollow worn wheels and non-linear wheel-rail contact, studying the Archard wear equation of wheel-rail rolling contact and long-acting iteration mechanism of wheel-rail wear, the mechanism of production of wheel hollow wear was revealed. By studying the input discrimination strategy of typical wheel-rail pairs, designing the non-linear factors, establishing the model of functional equivalent conicity of hollow worn wheel, integrated with wheel-rail rolling contact theory, revealing the coupling law between functional equivalent conicity and stability of train operation, the judgment methods of re-profiling of hollow worn wheels were established. By studying the cubic-NURBS mathematical model of the re-profiling profile of hollow worn wheels based on researches on curve theory, integrated with threshold interval of equivalent conicity and the law of wheel hollow wear, the economical re-profiling methods for profiles of hollow worn wheels of multi-wheelsets were established and verified by experiments. The outcomes of this project will improve the theory of wheel-rail relationship and re-profiling technology of wheel, prolong the wheel service life, and provide scientific theoretical support and practical method for guaranteeing the economical and safe operation of train.