钢轨磨耗型波磨计算模型与数值方法

分析了国内外铁路钢轨波浪形磨损理论模型，提出了车辆轨道垂、横向耦合动力学、轮轨滚动接触力学和钢轨材料摩擦磨损模型为一体的钢轨磨耗型波浪形磨损计算模型，发展了相应的数值方法。模型中车辆结构和轨道下部结构被简化成等效的质量、弹簧和阻尼系统，钢轨用Euler梁代替，并考虑它的垂向、横向弯曲变形和扭转变形，利用修改的Kalker三维弹性体非Hertz滚动接触理论和相应的数值方法计算轮轨蠕滑力和摩擦功，假设材料单位面积磨损量正比于轮轨接触面摩擦功密度。利用该模型和相应的数值方法分析了几个磨耗型波磨情况，结果表明该模型可以模拟轨道多种缺陷(轨缝、扁疤、凹坑、轨枕间距、随机不平顺等因素)引发的钢轨磨耗型初始波磨和发展规律，可以模拟由于钢轨在机械加工或打磨过程中形成的初始波磨的演化过程，可以通过改善轨道特性来消除或减少波磨的发生和发展。

Theoretical model and numerical method of rail corrugation

The theoretical models of rail corrugation were analyzed, a theoretical model and its numerical method for rail corrugation attributed to material wear were put forward. In the model, the non-Hertzian rolling contact theory of wheel and rail system, rail material wear model and coupling dynamics of rail vehicle and track in the vertical and lateral directions were combined, a passenger car and the structure under rails were replaced by the systems consisting of dampers, springs and equivalent mass bodies, and the Euler beam was utilized to model the rails accounting for bending and twisting deformations, Kalker's non-Hertzian rolling contact theory of three-dimensional elastic bodies was modified to calculate the creep forces and frictional work density on the contact patch of wheel and rail. It was assumed that the material loss unit area of the contact patch was proportional to the frictional work density that determines the wear depth of the rail running surface. The presented model and its numerical method were used to analyze two kinds of corrugation cases. The results show that the initiation and development of the corrugations caused by various track defects, such as track gap, scratch, dent, sleeper pitch and random geometry irregularities can be analysed, the evolution of initial corrugation on rail running surface caused by manufacturing and grinding can be simulated, they are feasible to protect the initiation and development of rail corrugation. 1 tab, 9 figs, 26 refs.