摘要
相对于1 m弦测值的焊缝接头动力学评估与管理,基于3 m波长范围的焊缝接头不平顺轮轨响应分析对其服役状态评估与管理具有重要意义。首先,基于车辆-轨道垂向耦合动力学理论建立车辆-轨道垂向耦合模型;然后,借助基于一弦N点弦测法研制的钢轨短波不平顺测量小车,对地铁线路焊缝接头不平顺进行精确测量,并根据传统弦测理论得到1 m弦测值;接着,将实测3 m波长焊缝接头不平顺和1 m弦测值作为车辆-轨道垂向耦合模型的不平顺激励输入,对比3 m波长焊缝接头不平顺和1 m弦测值激扰下的轮轨响应;最后,研究了车速和焊缝位置对轮轨动力响应的影响。结果表明:相比1 m弦测值激扰下的轮轨动力响应结果,3 m波长焊缝接头不平顺激扰下的轮轨力幅值变化不明显,轮重减载率幅值增大11.52%,钢轨加速度幅值增大54.05%,轮对振动加速度幅值增大37.67%;车速提高会导致轮轨力和轮重减载率幅值增大;焊缝中心与轨枕间的距离增加,轮轨力幅值先增加后减小,当焊缝中心距离轨枕0.1 m时,轮轨力幅值最大。
Compared with the dynamic evaluation and management of weld joint measured by 1m chord value,the wheel-rail response analysis of weld joint irregularity at 3 m wavelength is of great significance to service state evaluation and management.First,the vehicle track vertical coupling model is established based on the vehicle track vertical coupling dynamics theory.Then,the rail short wave irregularity measurement trolley developed based a multipoint chord reference system is used to accurately measure the irregularity of the metro line weld joint,and the 1 m chord measurement value is obtained according to the traditional chord measurement theory.The measured 3 m wavelength weld joint irregularity and the 1 m chord measurement value are used as the irregularity excitation of the vehicle track vertical coupling model.The wheel rail responses under the excitation of 3 m wavelength weld joint irregularity and 1 m chord measurement are compared.Finally,the effects of vehicle speed and weld position on wheel rail dynamic responses are studied.The results show that compared with the wheel rail dynamic response under the excitation of 1 m chord,the wheel rail force amplitude under the excitation of 3 m wavelength weld joint irregularity is not obvious,the wheel load reduction rate increases by 11.52%,the rail acceleration increases by 54.05%,and the wheel set vibration acceleration increases by 37.67%.The increase of vehicle speed magnifies the amplitude of vertical wheel rail force and wheel load reduction rate.With the increase of the distance between the weld and the sleeper,the wheel rail force amplitude first increases and then decreases.The wheel rail force is the largest at 0.1 m from the sleeper.
作者
徐舟
从建力
赵铭洋
王平
陈嵘
XU Zhou;CONG Jianli;ZHAO Mingyang;WANG Ping;CHEN Rong(MOE Key Laboratory of High-speed Rail Engineering,Southwest Jiaotong University,Chengdu 610031,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《铁道标准设计》
北大核心
2024年第2期52-59,67,共9页
Railway Standard Design
基金
国家自然科学基金项目(51778542)
四川省杰出青年科技人才项目(2020JDJQ0033)。
关键词
地铁
3m波长焊缝
钢轨焊缝接头
短波不平顺
车辆-轨道垂向耦合动力学
轮轨响应
metro
3 m wavelength weld join
rail welded joints
short wavelength irregularity
vehicle-track vertical coupled dynamics
wheel rail response
