地铁直线段钢弹簧浮置板轨道钢轨波磨萌生原因及参数影响分析

Analysis on the Causes of Rail Corrugation and the Influence of Parameters on the Steel Spring Floating Slab Track of the Metro Line

为研究某地铁直线地段钢弹簧浮置板轨道出现的波长为160~250 mm的钢轨波磨现象,基于有限元理论和车辆-轨道耦合动力学理论,建立了车辆-钢弹簧浮置板轨道刚柔耦合动力学模型。从轨道系统振动特性和轮轨接触特性角度出发,以钢轨磨耗功率为评判指标,研究了钢轨波磨产生原因及缓解措施。研究结果表明:钢轨波磨的产生与8~15阶左右两侧钢轨横向同向/反向弯曲振动模态、8~9阶轨道板垂向弯曲模态和6~8阶轨道板扭转振动模态有关;在不影响行车安全性的前提下,可通过扣件垂向刚度取值10~30 MN/m、扣件垂向阻尼取值20 kN·s/m以上或扣件横向阻尼取值30 kN·s/m以上来降低钢轨波磨通过频率处的磨耗功率,达到减缓钢轨波磨发展的目的。

In order to study the rail corrugation phenomenon with the wavelength of 160-250mm in the steel spring floating slab track of a certain subway straight section,a rigid-flexible coupling dynamics model of the vehicle-steel spring floating slab track is established based on the finite element theory and the vehicle-track coupling dynamics theory.From the point of view of the vibration characteristics of track system and the contact characteristics of wheel and rail,the causes and mitigation measures of rail wave wear are studied by taking the rail wear power as the evaluation index.The generation of rail corrugation may be related to the transverse co-direction/reverse bending vibration modes of the rails on the left and right sides of the 8-15 order,the vertical bending mode of the track plate of the 8-9 order,and the torsional vibration mode of the track plate of the 6-8 order.Under the premise of not affecting driving safety,wear power at the rail wave wear frequency can be reduced by taking the vertical stiffness of the fastener 10~30 MN/m,the vertical damping of the fastener more than 20 kN·s/m or the lateral damping of the fastener 30 kN·s/m,so as to slow down the development of rail wave wear.