轨道几何状态对高铁钢轨型面磨耗区段轮轨匹配特性的影响  

Influence of Track Geometry on Wheel-rail Matching Characteristics of Rail Wear Section of High-speed Railway

作　　者：杨爱红 高雅 王永华 金明 张家海 YANG Aihong;GAO Ya;WANG Yonghua;JIN Ming;ZHANG Jiahai(Infrastructure Inspection Research Institute,China Academy of Railway Sciences,Beijing 100081,China;Track Maintenance Department,China Railway Shanghai Group Co.,Ltd.,Shanghai 200071,China;Track Maintenance Department,China Railway Guangzhou Group Co.,Ltd.,Huizhou 516023,China)

机构地区：[1]中国铁道科学研究院集团有限公司基础设施检测研究所,北京100081 [2]中国铁路上海局集团有限公司工务部,上海200071 [3]中国铁路广州局集团有限公司惠州工务段,广东惠州516023

出　　处：《铁道标准设计》2023年第11期38-44,共7页Railway Standard Design

基　　金：中国铁道科学研究院集团有限公司科研开发计划项目(2019YJ161,2021YJ063)。

摘　　要：为分析某运营速度250 km/h高速铁路直线区段的钢轨磨耗情况及其与轨道几何不平顺共同作用下对轮轨匹配特性的影响,建立车轨系统动力学模型,结合非Hertz轮轨滚动接触理论,对比了实测磨耗轮轨型面匹配时,轮轨静态接触的接触点分布、等效锥度以及动态轮对横移量、接触斑面积和最大接触应力的分布特征及其与CHN60&LMA型面匹配时的差异,进一步研究轨道几何状态对钢轨磨耗区段轮轨接触特性的影响。研究结果表明:磨耗钢轨型面左右股光带宽度和垂磨量均存在差异,左右股钢轨型面对称性差;钢轨磨耗导致轮轨接触点分布较为分散,在轮对横移量较小时,等效锥度较大,在轮对横移量较大时,等效锥度较小;轨道几何不平顺作用下磨耗钢轨型面左股钢轨接触斑面积大于右股钢轨,左股钢轨最大接触应力小于右股钢轨,仿真计算结果与现场测试情况一致;与采用CHN60型面相比,采用磨耗钢轨型面轮对的对中能力较差,左右股钢轨接触斑面积减小量的95%分位数约为90 mm^(2),最大接触应力增加量的95%分位数约为800 MPa和900 MPa,轮轨接触状态不良;应及时开展直线段左右股钢轨光带差异较大、钢轨廓形对称性较差区段钢轨打磨工作,以改善钢轨服役状态,保障轮轨良好匹配。In order to analyze the rail wear of a high-speed railway with an operating speed of 250 km/h and and its influence on the wheel-rail matching characteristics under the combined action of track geometric irregularity,a dynamic model of the vehicle-rail system is established.Combined with the non-Hertz wheel-rail rolling contact theory,the distribution characteristics of wheel-rail contact points,equivalent conicity,wheelset lateral displacement,contact area,maximum contact stress when the measured worn wheel-rail profile is matched are analyzed.Meanwhile,the differences between them and CHN60LMA profile matching are compared,and the influence of track geometry on wheel-rail contact characteristics with worn rail profiles is further studied.The result show:There are differences in the light band width and vertical wear of worn rail profiles,and the symmetry of left and right rail profiles is poor;Rail wear leads to distribution dispersion of wheel-rail contact points.When the wheelset lateral displacement is small,the equivalent conicity is large,and when the wheelset lateral displacement is large,the equivalent conicity is small;Under the influence of track irregularity,the contact area of the left worn rail profile is larger than that of the right rail,and the maximum contact stress of the left rail is smaller than that of the right rail.The simulation results are consistent with the field test results;Compared with CHN60 profile,the alignment ability of the wheelset with worn rail profile is poor.The 95% quantile of the contact area reduction of the left and right rail is about 90 mm^(2),and the 95% quantile of the maximum contact stress increase is about 800 MPa and 900 MPa.The wheel rail contact state is poor;In order to improve the service status of the rail and ensure the appropriate matching of the wheel and rail,the grinding work of the rail in the section with large light band difference between the left and right rails and poor symmetry of the rail profiles shall be carried out in time in the straight l

关 键 词：高速铁路 钢轨磨耗 轮轨型面匹配 车轨系统动力学 轮轨接触 

分 类 号：U213.2[交通运输工程—道路与铁道工程] U238