基于扣件弹条固有频率的扣压力检测与试验验证  

Toe Load Detection and Test Verification Based on the Natural Frequency of Fastener Elastic Rod

作　　者：丁正祥 曹子文 柳明佳 刘林芽[3] 韦征 胡浙泉 宋瑞 DING Zhengxiang;CAO Ziwen;LIU Mingjia;LIU Linya;WEI Zheng;HU Zhequan;SONG Rui(Zhejiang Traffic Engineering Management Center,310015,Hangzhou,China;Zhejiang Scientific Research Institute of Transport,311305,Hangzhou,China;School of Transportation Engineering,East China Jiaotong University,330013,Nanchang,China;Zhejiang Engineering Co.,Ltd.,China Railway 24th Bureau Group,310009,Hangzhou,China;School of Civil and Architectural Engineering,Nanchang Institute of Technology,330099,Nanchang,China)

机构地区：[1]浙江省交通工程管理中心,杭州310015 [2]浙江省交通运输科学研究院,杭州311305 [3]华东交通大学交通运输工程学院,南昌330013 [4]中铁二十四局集团浙江工程有限公司,杭州310009 [5]南昌工程学院土木与建筑工程学院,南昌330099

出　　处：《城市轨道交通研究》2024年第9期154-159,共6页Urban Mass Transit

基　　金：江西省自然科学基金重点项目(20192ACBL20009);浙江省交通运输厅科技项目(2021003)。

摘　　要：[目的]扣件弹条的扣压力不足,会诱发周围扣件松脱,加剧轮轨之间的动力响应,影响轨道部件的使用寿命。相对于弹条缺失和断裂,弹条松脱较难通过常规的工人巡检发现,需要研究扣件弹条扣压力的检测方法。[方法]以高速铁路的WJ-7型扣件弹条为例,建立了扣件系统的精细化模型,分析了扣件弹条在不同扣压力状态下的模态特征,得到扣件弹条扣压力与固有频率的对应关系,进而提出通过测试弹条模态频率来推算扣压力的快速无损检测方法。选取我国某国家重点实验室轨道试验基地的高铁线路作为试验现场,对该检测方法进行试验验证。[结果及结论]不同扣压力状态下,弹条第1阶模态振型特征均表现为弹条两侧肢产生垂向振动和扭转;弹条第1阶固有频率仿真值与实测值差值比例绝对值的最大值为3.24%,可以认为该试验方法具有有效性。[Objective]The insufficient toe load of the fastener elastic rod will induce loosening of the surrounding fasteners,aggravate the dynamic response between wheels and rails,affecting the service life of the track components.Compared with the missing and breaking of the fastener elastic rod,fastener elastic rod loosening is more difficult to be spotted by routine manual inspection,so the toe load detection method of the fastener elastic rods needs to be studied.[Method]Taking WJ-7 fastener elastic rod of high-speed railway as an example,a refined model of fastener system is established,the modal characteristics of fastener elastic rod under different toe load states are analyzed,corresponding relationship between the toe load of fastener elastic rod and the natural frequency is obtained,and a rapid non-destructive testing method for calculating the toe load by testing the modal frequency of elastic rod is proposed accordingly.The high-speed railway line at the track test base of a State Key Laboratory is selected as the test site,and the test verification of the detection method is carried out.[Result&Conclusion]Under different toe load states,the 1st modal shape characteristics of elastic rods all manifest as vertical vibration and torsion on both side legs of the elastic rod.The maximum absolute value of the difference ratio between the simulation value and the measured value of the elastic rod 1st order natural frequency is 3.24%,so the test method can be considered as effective.

关 键 词：高速铁路 轨道结构 扣件弹条 扣压力 有限元分析 模态振型 

分 类 号：U213.53[交通运输工程—道路与铁道工程]