焊缝不平顺对车辆-无砟轨道-路基系统振动特性的影响  

Influence of Weld Irregularity on Dynamic Responses of Vehicle-track on Subgrade Vibration System

作　　者：裴承杰 宋小林[1] 穆玲 

机构地区：[1]西南交通大学牵引动力国家重点实验室,成都610031 [2]四川川油工程技术勘察设计有限公司,成都610031

出　　处：《四川理工学院学报（自然科学版）》2016年第3期50-54,共5页Journal of Sichuan University of Science & Engineering(Natural Science Edition)

基　　金：国家重点基础研究发展计划(2013CB036200);国家自然科学基金项目(51478397;51008254);牵引动力国家重点实验室自主研究项目(2016TPL-T07)

摘　　要：基于车辆-轨道耦合动力学理论,应用有限元方法建立车辆-CRTSIII型板式无砟轨道-路基系统垂向耦合动力学模型,对高速车辆通过钢轨焊缝不平顺的动力学响应进行了仿真分析,并对比了不同形式钢轨焊缝不平顺对系统的影响。有限元计算结果表明:高速行车条件下,钢轨焊缝不平顺会引起车辆、轨道、路基系统动力学性能不同程度的变化,引起轮轨力响应增大,对与不平顺直接接触的轮对和钢轨振动产生较大影响,对行车舒适性影响有限。不同形式的焊缝不平顺对系统影响程度各有不同,凹、凸型焊缝不平顺对动力特性的影响相对接近,凹型焊缝不平顺叠加一短波不平顺后,对轮对和轨道结构振动加速度影响明显,轨道结构应力增大,受力状态恶化。在高速铁路日常运营维护中,应重视钢轨叠加焊缝不平顺引起的冲击振动作用。Based on vehicle-track coupled dynamics theory,a finite element model of vehicle-slab track on subgrade was developed to explore the influence of rail weld joints on dynamic responses,the dynamic response of high speed vehicle through rail welding seam was simulated and analyzed and compared the dynamic responses of different kinds of rail weld irregularity on the system,the results showed that under high speed conditions,the rail weld made the dynamic performances of the vehicle-track and subgrade system changed in different degrees and the wheel / rail force increased,great influence on the wheel and rail vibration was caused because they directly contacted with the irregularity,but the weld irregularity made little difference on comfort. Different forms of weld irregularities had different influence on the system,The influence of the concave and convex weld irregularities on the dynamic characteristics was relatively close. After concave weld uneven stacked a short wave irregularity,the influence of vibration acceleration of wheelset and track structure was more obvious,track and subgrade structure stress were all increased,and the stress state of the track structure was deteriorated. In the maintenance of high speed railway in daily operation,it was important to pay attention to impact vibration effect caused by the rail overlapping shape weld irregularity.

关 键 词：车辆-轨道耦合动力学 焊缝不平顺 动力特性 有限元 CRTSIII型无砟轨道 

分 类 号：TB115[理学—数学]