高速扫掠力作用下轨基检测位置动力响应分析与实验研究

【作者】 陈盛钊；

【导师】 黄志辉；

【作者基本信息】 中南大学 ， 机械电子工程， 2011， 硕士

【摘要】 近年来铁路运输成为货物运输的主要手段,而货车的超载和偏载不仅影响轨道的疲劳和使用寿命,而且是诱发铁道交通事故的重要因素。因此,使用高速轨道超偏载监测技术,及时检测货车的超偏载现象,对于有效地减小轨道恶性事件的发生频率有重要意义。为深入研究转向架轴间两轮对监测输出的相互影响,参照现有的轮轨扫掠力监测实验台,建立了三维轮轨动力学有限元模型,使用显式动力分析软件LS-DYNA,研究在轮轨扫掠力作用下,转向架轴间两轮对监测输出的相互影响；将仿真结果与实验结果相对比,论证有限元分析的结果,完善了轮轨扫掠力监测系统的研究理论与体系。论文的主要研究内容如下：(1)研究了国内外轮轨模型研究现状,介绍了使用LS-DYNA进行分析时使用的方法,以及对分析结果进行滤波时所采用的滤波方法。(2)以轮轨实验台为研究对象,使用HYPERMESH建立了轮轨有限元模型,参考实验台定义了单元类型,材料模型,边界条件和初始条件,控制参数等,使用LS-DYNA分析了不同车速下轮轨检测位置的应变响应。(3)使用MATLAB将LS-PREPOST提取的仿真结果进行数据处理,分析了转向架轴间两轮对监测输出的相互影响；在实验台上完成了不同速度下钢轨检测位置处综合应变响应的实验；将仿真结果与实验结果相对比,分析其异同,并提出了改进方案。更多还原

【Abstract】 In recent years, rail transport has become the main method for freight. However, overload and partial load of freight train cars not only bring down the fatigue and service life of track, but also be a key factor inducing railway traffic. Therefore, it is of great importance to timely detect the phenomenon of unbalanced loading of train cars, using unbalanced load monitoring technology for high-speed rail.To deeply study the influence between the front wheel and the back wheel, an experiment rig monitoring wheel-rail forces was designed. Three-dimensional wheel-rail finite element model was set up according to the real experiment rig, explicit dynamic analysis was made to find the relationship between strain and car speed in the detecting position. The validity of outcomes was demonstrated by comparing to the experimental results. These works perfected the research theory and system for wheel-rail force monitoring system. This paper will include the following research contents:(1). Current situation studies of home and abroad models of wheel-rail were made, the theory of dynamic finite element analysis was introduced, then the paper displayed the methods when using LS-DYNA and filter methods for results.(2). Wheel-rail finite element models were set up and then element types, material models, boundary conditions, initial conditions and controlling parameters were defined according to the real object. After that, strain responses of different positions under various speeds were obtained by using LS-DYNA.(3). Strain response discipline of current and adjacent cross-section was drawn by Matlab data processing of LS-PREPOST simulation data. Improvement scheme were brought forward after the comparison between simulation results and experimental results.更多还原