短轨枕区间钢轨波磨的现场测试和数值研究  

Field measurement and numerical simulation for rail corrugation in sector of fixed dual short sleeper

作　　者：崔晓璐 闫硕[2] 陈光雄 CUI Xiaolu;YAN Shuo;CHEN Guangxiong(School of Mechanotronics ＆ Vehicle Engineering, Chongqing Jiaotong University , Chongqing 400074, China;School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China)

机构地区：[1]重庆交通大学机电与车辆工程学院,重庆400074 [2]西南交通大学机械工程学院,四川610031

出　　处：《振动与冲击》2018年第13期171-176,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金资助(51275429);2015年西南交通大学博士研究生创新基金;中央高校基本科研业务费专项资金

摘　　要：基于轮轨摩擦自激振动导致钢轨波磨的观点,综合采用现场测试和数值仿真的方法共同研究了短轨枕整体道床支撑小半径曲线轨道上的钢轨波磨。在现场测试中,测试了车辆通过该区段时的振动信号。在数值仿真中,建立了短轨枕整体道床支撑小半径曲线轨道上导向轮对的弹性振动模型。综合采用瞬时动态分析和复特征值分析计算了轮对通过该路段时的动态响应和不稳定振动模态。现场测试和数值仿真结果的一致进一步证明了在小半径曲线轨道上,轮轨间的饱和蠕滑力能够导致轮轨系统发生摩擦自激振动,从而产生钢轨波磨。同时,当轮对通过相应测点时,可以发现其垂向振动加速度具有明显波动,这意味着摩擦自激振动的产生。并且,在里轨表面垂向振动加速度的振幅明显大于在外轨表面垂向振动加速度的振幅。因此,由摩擦自激振动导致的钢轨波磨主要发生在里轨上,且通过数值仿真预测得到摩擦自激振动导致波磨的波长与现场实测结果近乎一致。Based on the viewpoint of wheel-rail friction-induced oscillation causing rail corrugation,both field measurement and numerical simulation were used to study rail corrugation on a curved track sector with a small radius supported by a short sleeper integral track bed.In field measurement,vibration signals of vehicles were measured when a train passing through the sector.In numerical simulation,an elastic vibration model of a guide wheel pair on a curved track sector with a small radius supported by a short sleeper integral track bed was established.The dynamic responses and unstable vibration modes of the guide wheel pair were calculated when it passing through this sector using the transient dynamic analysis and the complex eigenvalue analysis.The good agreement between the results of field measurement and numerical simulation verified that saturated creep sliding forces between the wheel pair and rails can trigger the frictioninduced oscillation to cause rail corrugation; the vertical vibration acceleration of the wheel pair on rail surface has an obvious fluctuation when it passing through the relevant measured point,this means the friction-induced oscillation happens; the amplitude of vertical vibration acceleration on the inner rail surface is much larger than that on the outer rail surface,so rail corrugation caused by the friction-induced oscillation mainly occurs on the inner rail; the wavelength of rail corrugation caused by friction-induced oscillation agrees well with that measured at the test site.

关 键 词：钢轨波磨 现场测试 数值仿真 自激振动 短轨枕 

分 类 号：U211[交通运输工程—道路与铁道工程]