高平顺、高稳定、高可靠是高速铁路基础结构必须具备的基本属性,对轨道平顺状态进行全面准确评价是保证轨道高平顺性的根本前提.针对我国现行轨道不平顺评价方法中存在的不足,定义一种用于描述局部波动的多尺度标准差卷积变换模型,并借助脉冲函数分析该模型的基本特性.结合某高速铁路动检数据,分析该模型对轨道平顺性的评估效果,基于最大熵原理确定最优局部管理区段长度为15 m,并提出轨道局部波动指数概念.实例分析表明,轨道局部波动指数反映了局部波动与轨道平顺状态的内在关联,能够对轨道局部波动进行准确定位,可以为轨道养护维修方案的制定提供新依据.%High regularity , high stability and high reliability are the basic properties of high-speed railway infra-structure w hich covers vast geographical space . Comprehensive and accurate evaluation on track regularity is the basic precondition to guarantee the high regularity of rail . In this paper , a multi-scale standard deviation convolution transform(SDCT) model ,used to describe the local fluctuation ,was established based on the a-nalysis of current rail irregularity evaluation method . The basic features of the SDCT model were analyzed u-sing the pulse function .Combining the data of dynamic inspection vehicle in a high-speed railway , the evalua-tion effect of the model on track regularity was analyzed . The optimum length of the local segment was set to be 15 m based on the maximum entropy principle , and then the concept of the track local fluctuation index (TLFI) was put forward .Case analysis showed that this index ,which reflected the internal connection be-tween the local fluctuations and rail regularity state ,can locate the local fluctuations accurately ,and can pro-vide a new reference for developing a track maintenance plan .
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