摘要
针对高速铁路减振型无砟轨道,为研究减振垫刚度及板端抗剪刚度对扣件弹条疲劳损伤的影响,提出扣件弹条疲劳损伤分析方法,建立车辆-轨道系统耦合动力学模型,计算不同减振垫刚度及板端抗剪刚度下,单元板板端、板中与板尾扣件弹条的疲劳损伤。通过分析得到如下结论:(1)减振垫刚度能够显著影响板端与板尾扣件弹条的疲劳损伤,对板中扣件弹条疲劳损伤影响较小,提高减振垫刚度能够显著减小扣件弹条整体疲劳损伤;(2)减振垫刚度越大,扣件弹条疲劳损伤差异性越小,当减振垫刚度小于30 MPa/m时,差异性指标均大于5,需采取措施减小其差异性;(3)板端抗剪刚度能够减小弹条疲劳损伤差异性,建议减振垫刚度为10 MPa/m时,板端抗剪刚度取100~200 kN/mm,可将弹条疲劳损伤差异性指标控制在5左右,减振垫刚度为20,30 MPa/m时,板端抗剪刚度取100 kN/mm,可将弹条疲劳损伤差异性指标控制在2~3范围内。
In order to study the influence of stiffness of damping pad and plate end shear stiffness on fatigue damage of fastener spring in low vibration ballastless track in high-speed railway, the method for analyzing fatigue damage of fastener spring and the dynamic model of vehicle-track coupling system are established. By calculating and analyzing the fatigue damages of fastener clips at the front-end, in the middle and at the back-end of unit plate under different damping pad stiffness and plate end shear stiffness, the following conclusions are obtained:(1) Stiffness of damping pad can significantly affect the fatigue damage of fastener clips at the end of plate, but has little effect in the middle of plate. Improving the stiffness of damping pad can significantly reduce the whole fatigue damage of fastener clips.(2)The difference of fatigue damage of fastener clips decreases with the increase of the stiffness of damping pad. When the stiffness of damping pad is less than 30 MPa/m, the difference index is greater than 5 and measures should be taken to reduce the difference.(3)The shear stiffness at plate end can reduce the difference of fatigue damage. It is suggested that when the damping pad stiffness is 10 MPa/m, the shear stiffness should be 100~200 kN/mm, the fatigue damage difference index can be controlled around 5;when the damping pad stiffness is 20 MPa/m or 30 MPa/m, the shear stiffness at plate end should be 100 kN/mm, and the fatigue damage difference index can be controlled in the range of 2~3.
作者
刘玉涛
闫晓夏
高明显
赵崇基
LIU Yutao;YAN Xiaoxia;GAO Mingxian;ZHAO Chongji(Shenzhen Research and Design Institute of CARS,Shenzhen 518034,China;Shenzhen Engineering Laboratory for Vibration and Noise Reduction of Urban Rail Transit,Shenzhen 518034,China)
出处
《铁道标准设计》
北大核心
2022年第7期12-16,24,共6页
Railway Standard Design
基金
中国国家铁路集团有限公司科技研究计划重点课题(N2020G010)
铁科院(深圳)研究设计院有限公司所基金课题(1852SZ0602)。
关键词
高速铁路
减振型无砟轨道
扣件弹条
疲劳损伤差异性
概率分布
high-speed railway
low vibration ballastless track
fastener clips
fatigue damage difference
probability distribution characteristics
