地铁浮轨式扣件轨道轮轨瞬态滚动接触行为分析
Analysis of Transient Wheel-rail Rolling Contact Behavior for Metro Tracks with Floating Fasteners
姚学东 1李伟 1温泽峰 1周志军 1周圣禄1
作者信息
- 1. 西南交通大学轨道交通运载系统全国重点实验室 成都 610031
- 折叠
摘要
浮轨式扣件通过支承钢轨轨颚下部及轨腰使其悬浮从而提供轨道较小垂向刚度,但加剧了轮轨系统高频相互作用.为分析轮对、轨道柔性特性对轮轨瞬态滚动接触行为的影响,基于隐式—显式相结合的有限元法,建立地铁浮轨式扣件轨道三维轮轨瞬态滚动接触有限元模型.对比分析牵引工况下柔性和刚性轮对分别在光滑、凹坑和短波不平顺轨面激励下的轮轨瞬态力、接触斑和接触应力等接触参量响应特性.结果表明:光滑轨面激励下,轮对柔性对轮轨力影响不明显,但对接触斑和接触应力影响明显.凹坑脉冲激励下,轮对柔性对350～600 Hz频带的轮轨垂向力响应影响明显,这与车轮反向翻转和一阶弯曲模态被激发引起的轮轨耦合振动行为相关;且刚性轮对的接触斑面积约为柔性轮对的59％～82％,接触应力最大值约为柔性轮对的140％～162％.短波长不平顺激励下,轮轨垂向振动主要表现为受迫振动,轮对柔性主要影响580 Hz以上的轮轨垂向力响应.
Abstract
Floating fasteners,as a type of resilient fasteners,provide a low vertical stiffness for metro tracks by supporting the low jaw and web of the rail.However,they intensify the high-frequency wheel-rail interaction.To analyze the influence of flexibility of wheelset and track on the wheel-rail transient rolling contact behavior,three-dimensional finite element model of wheel-rail transient rolling contact for metro tracks with floating fasteners are established by ABAQUS.The model combines implicit and explicit algorithms of the FE method.The influence of wheelset flexibility on wheel-rail contact parameters is analyzed when the wheelset with traction force passed over the rail with smooth surface,dent and periodic irregularity.The contact parameters are mainly the wheel-rail transient contact force,contact patch and contact stress.The simulation results show that the influence of wheelset flexibility on the wheel-rail force is small when the rail surface is smooth.However,its influence on the wheel-rail contact patch and contact stress is obvious.Under an impulse excitation of the dent,the wheelset flexibility has a significant effect on the wheel-rail vertical forces at frequencies of 350-600 Hz,which is related to the reverse rotation and first-order bending modes of the wheel.The contact patch area and maximum contact stress of the rigid wheelset are about 59％-82％and 140％-162％for those of the flexible wheelset,respectively.Under an excitation of the periodic irregularity,the wheel-rail vertical forces above 580 Hz are affected only by the wheelset flexibility due to forced vibrations of the wheel-rail system.
关键词
地铁轨道/浮轨式扣件/柔性轮轨/轮轨瞬态滚动接触/有限元法Key words
metro track/floating fasteners/dynamic characteristics of wheelset and track/wheel-rail transient rolling contact/finite element method引用本文复制引用
出版年
2024
NETL
NSTL
万方数据