基于结构函数分形表征的地铁钢轨波磨评价方法

Evaluation Method of Metro Rail Corrugation Based on Fractal Characterization of Structure Function

钢轨波磨问题出现至今已有百年历史,但仍未得到有效解决,在现有钢轨打磨标准中提出的钢轨波磨评价指标普遍存在无法从多尺度对钢轨波磨粗糙情况进行评价的问题,难以与波磨对列车运行动力学性能的影响对标。通过对钢轨波磨轨面不平顺数据进行分形分析,改进并提出适用于钢轨波磨轨面不平顺的分形指标,以此来量化评估钢轨波磨对列车运行动力学性能的影响。研究表明,与轮轨力波动指标拟合效果最优的钢轨波磨评价指标为修正后的分形维数+尺度系数,并建立三者之间的映射关系经验公式,可用于指导基于钢轨波磨的钢轨打磨策略。

The issue of rail corrugation has existed for a century,yet it remains unresolved.There is a general problem that the rail corrugation evaluation indicators proposed in the existing rail grinding standards cannot evaluate the roughness of rail corrugation from multiple scales,and it is difficult to benchmark with the influence of corrugation on dynamics performance of train operation.Through fractal analysis of rail corrugation rail surface irregularity data,this paper proposes optimized fractal indicators suitable for rail corrugation rail surface irregularity,so as to quantitatively evaluate the influence of rail corrugation on dynamics performance of train operation.The study indicates that the rail corrugation evaluation indicators,which fit best with the wheel-rail force fluctuation indicator,are modified fractal dimension+scale coefficient,and an empirical formula of mapping relationship among the three is established to guide the rail grinding strategy based on rail corrugation.