钢轨打磨对焊接接头区的不平顺及其动力学响应的影响  

The Effect of Rail Grinding on Weld Irregularity and Dynamic Response

作　　者：付青云 吴磊[2] 陈帅[3] 王衡禹[1] 温泽峰[1] 

机构地区：[1]西南交通大学牵引动力国家重点实验室,四川成都610031 [2]西南交通大学峨眉校区机械工程系,四川峨眉614202 [3]西南交通大学机械工程学院,四川成都610031

出　　处：《润滑与密封》2016年第3期66-70,80,共6页Lubrication Engineering

基　　金：国家自然科学基金-煤炭联合基金项目(U1361117);国家自然科学基金面上项目(51275430);铁路总公司科技研究开发计划(2015G008-B;2014G002-A);牵引动力国家重点实验室开放课题(TPL1401)

摘　　要：利用钢轨焊接接头不平顺测量仪Railprof,测量并分析国内某高铁线路钢轨的焊接接头区在打磨前后几何不平顺的变化,发现钢轨打磨能够减小焊接接头的不平顺幅值。基于车辆-轨道耦合动力学理论,建立高铁车辆-轨道耦合动力学模型,以实际测得的钢轨焊接接头不平顺作为轮轨界面不平顺激励输入,分析焊接接头不平顺引起的轮轨动力学响应的特征,并讨论行车速度对焊接接头不平顺激扰下轮轨动力学响应的影响。结果表明,轮轨垂向力随着车辆通过速度的增加而增加,打磨后的轮轨垂向力以及轮重减载率相比于打磨前明显降低;钢轨打磨改善了焊接接头的不平顺性,并使轮轨的动力学性能(安全性)相应地得到改善。The weld irregularity of the rail on a high?speed railway in China before and after grinding was measured by using the Railprof,and the change of the weld area geometric irregularity was analyzed.It is shown that the rail grinding can reduce the amplitude of weld irregularity. Based on the vehicle?track coupled dynamics theory, the high?speed vehicle?track coupled dynamics model was established,the characteristic of the wheel?rail dynamic response due to the rail weld ir?regularity was investigated, and the effect of the train speed on the wheel?rail dynamic response was also discussed. Re?sults show that wheel/rail vertical force is increased with the increasing of train speed.The wheel/rail vertical force and re?duction rate of wheel load are significantly reduced after rail grinding.The amplitude of weld is decreased and the weld ir?regularity is improved after rail grinding, so the dynamic performance and security are improved.

关 键 词：钢轨打磨 焊接接头 几何不平顺 动力学响应 

分 类 号：TH117.1[机械工程—机械设计及理论]