Abstract

Taking the typical corrugation phenomenon on a curved track in a metro line as the research object, the modeling method of railway fastener in the friction self-excited vibration model of a wheel–rail system is studied in this article. Firstly, according to the difference of the track support structure in the actual metro line, finite element models of the leading wheel–track system under different track forms, including the short sleeper with a DTVI2 fastener, the shock-absorbing track with a Cologne egg damping fastener, and the ladder sleeper track with a DTIII2 fastener, were established. The rail corrugation on a curved track with a small radius with three different sleepers is studied through complex eigenvalue analysis. In addition, the difference in rail corrugation finite element prediction model with a spring–damper pair model, solid-connected model, and solid-connectmodel is studied. The stability and vibration characteristics of a wheel–rail system with different tracks are studied by complex eigenvalue analysis. The research shows that the frictional self-excited vibration of a wheelset–track system occurs under saturated creep force, and the deformation caused by unstable vibration mainly occurs in the low rail and inner wheel, which can explain why the rail corrugation of a curved track with a small radius mainly occurs in the low rail. Compared with the spring–damper pair fastener model, the calculation result using the solid element fastener model (the solid-connected model and the solid-contact model) is closer to the measured data of the rail corrugation of the curved line with a small radius on the site. Of the two solid element fastener models, the latter is significantly more accurate than the former in predicting rail corrugation on the metro lines.

摘要

本文以地铁线路曲线轨道上典型的波纹现象为研究对象，研究了轮轨系统摩擦自激振动模型中铁路扣件的建模方法。首先，根据实际地铁线路轨道支撑结构的不同，建立了不同轨道形式下的前轮-轨道系统的有限元模型，包括带DTVI2扣件的短轨枕、带科隆蛋的减震轨道。建立了阻尼扣件和带DTIII2扣件的梯形轨枕轨道。通过复特征值分析研究了三种不同轨枕在小半径曲线轨道上的钢轨波纹。此外，钢轨波纹有限元预测模型与弹簧-阻尼器对模型的差异，固体连接模型，并研究了固体连接模型。采用复特征值分析方法研究了不同轨道轮轨系统的稳定性和振动特性。研究表明，轮对-轨道系统的摩擦自激振动发生在饱和蠕变力作用下，不稳定振动引起的变形主要发生在低轨和内轮，这可以解释为什么弯曲轨道的钢轨有波纹。小半径主要发生在低轨。与弹簧-阻尼副扣件模型相比，使用实体单元扣件模型（实体连接模型和实体接触模型）的计算结果更接近小半径曲线的钢轨波纹实测数据在网站上。在两个实体元件紧固件模型中，