可动心轨道岔转换结构动力学特性研究  

Analysis on the dynamic characteristics of turnout switching equipments

作　　者：徐井芒[1] 王平[1] 谢铠泽[1] 孙晓勇[2] 

机构地区：[1]西南交通大学高速铁路线路工程教育部重点实验室,四川成都610031 [2]中国铁路通信信号集团公司,北京100166

出　　处：《铁道科学与工程学报》2014年第1期29-35,共7页Journal of Railway Science and Engineering

基　　金：高铁联合基金重点资助项目(U1234201);铁道部重大科技课题(2012G013-A);西南交通大学博士创新基金资助项目

摘　　要：为指导可动心轨道岔转换结构优化设计,根据道岔区轮轨系统耦合动力学理论,建立可考虑转换结构实际特性的车辆-道岔动力学模型,以60 kg/m钢轨客运专线18号道岔可动心轨辙叉外锁闭装置为例,分析心轨不足位移,顶铁离缝和扣件横向刚度等对心轨转换结构力学特性的影响.研究结果表明:心轨第一牵引点处转换结构力学性能主要受不足位移影响,其受力及变形随着心轨不足位移增大而增大,呈线性增长关系,故在道岔运营过程中应严格控制心轨不足的出现;心轨第二牵引点处转换结构力学性能主要受顶铁离缝影响,但影响范围有限,在顶铁离缝小于1 mm范围内,其受力及变形随着顶铁离缝增大而减小,之后影响较小;扣件横向刚度变化对转换结构的受力及变形几乎没有影响。In order to guide the structural optimization design of turnout switching equipments, the vehicles - turnout dynamics model that switching equipments could be considered was established according to the wheel - rail system coupled dynamics on turnout. Taking the external locking device of 60 kg/m rail No. 18 movable frog in passenger dedicated line as an example, the intluences of some main factors, including scant displacement of nose rail, the gap between nose rail and block and lateral fastener stiffness on the mechanical properties of switching equipments were analyzed. The computational results show that the mechanical properties of first drawing point were mainly affected by scant displacement of nose rail, the stress and deformation of switching equipments would increasing with the increasing of the scant displacement, which presents almost a linear relationship, and the displacement should be avoided during the operation of turnout. The mechanical properties of second drawing point are mainly affected by the gap between nose rail and block. When the gap is less than 1 mm, the stress and deformation would increase with the decreasing of the gap, and then that has little effect. The influence of the lateral fastener stiffness on the force and deformation of switchin~ equipments is almost negligible.

关 键 词：转换结构 不足位移 顶铁离缝 扣件横向刚度 力学性能 

分 类 号：X913.4[环境科学与工程—安全科学]