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首页> 外文会议>ASME/IEEE/ASCE joint rail conference 2008 : Mechanical and civil engineering papers ; Electrical engineering papers >MEASUREMENT OF VERTICAL TRACK MODULUS - FIELD TESTING, REPEATABLITY, AND EFFECTS OF TRACK GEOMETRY
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MEASUREMENT OF VERTICAL TRACK MODULUS - FIELD TESTING, REPEATABLITY, AND EFFECTS OF TRACK GEOMETRY

机译：垂直轨迹模量的测量-现场测试，可重复性和轨迹几何形状的影响

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摘要

The heavy axle loads and high speeds of modern freight trains produce high track stresses leading to quicker track degradation. Track loads can be increased by variations in vertical track stiffness -the relationship between vertical rail deflection and the vertical applied load - and vertical track modulus. Both low track modulus and large variations in track modulus (leading to increased dynamic loading) cause accelerated track degradation and associated increased maintenance requirements. The University of Nebraska, under sponsorship from the Federal Railroad Administration, continues to develop a method to measure vertical track deflection and modulus from a rail car traveling at revenue speed.rnThis paper first summarizes past work to develop a method to measure vertical track deflection from a moving rail car. The measurement is made by attaching a beam to the sideframe of a loaded hopper car that extends along the rail toward the car's center. Then the deflection of the rail is measured approximately four feet from the inner wheel using a camera/laser system. The measurement determines the offset between the rail and the line established by the two wheel/rail contact points. These deflection measurements can then be used to estimate track modulus.rnResults are presented for repeated tests on approximately three hundred miles of heavy axle load freight line over a period of about ten months. These results have shown that the measurements of the above system are extremely repeatable and are not significantly related to train speed. The measurements also show seasonal variations in track modulus caused by factors such as variations in subgrade moisture and ambient temperature. The system has shown a notable ability to identify locations at high risk of derailments. After each of the four tests, a "top ten" list was created indicating the largest changes in relative deflection in descending order (one top tenrnlist corresponding to each of the four tests). The lists were created based on exception criteria presented by the authors at last year's conference. Four derailments occurred over this ten month period and three of those derailments appear in the top ten lists (#2, #10, in list one and #1 in list four). Finally, simulation and experimental analysis that quantify and assess the co-relation between this system and track geometry is presented. Extreme track geometry variations can create errors as the relative deflection measurement is mapped into a specific value of track modulus. This effect is also quantified and described.
机译：现代货运火车的重轴负载和高速产生高轨道应力，导致轨道退化更快。轨道载荷可以通过改变垂直轨道刚度（垂直轨道挠度与垂直施加载荷之间的关系）和垂直轨道模量来增加。较低的履带模量和较大的履带模量变化（导致动态载荷增加）都会导致履带加速退化，并增加维护要求。内布拉斯加大学在联邦铁路管理局的资助下，继续开发一种以收益速度行驶的铁路车辆测量垂直轨道挠度和模量的方法。rn本文首先总结了过去开发用于测量垂直轨道挠度方法的工作。移动的有轨电车。该测量是通过将梁连接到已装料的漏斗车的侧架上来完成的，该侧架沿着轨道朝着车辆的中心延伸。然后，使用摄像头/激光系统在距内轮约四英尺处测量导轨的挠度。该测量确定轨道与由两个车轮/轨道接触点建立的线之间的偏移。然后，这些挠度测量值可用于估算轨道模量。在大约十个月的时间内，对大约三百英里的重轴载货线进行了重复测试，得出了结果。这些结果表明，上述系统的测量结果具有极高的可重复性，并且与火车速度无关。测量结果还显示了由诸如路基湿度和环境温度变化等因素引起的轨道模量的季节性变化。该系统已显示出识别出高脱轨风险位置的显着能力。在这四个测试中的每一个之后，创建一个“前十个”列表，以降序指示相对挠度的最大变化（一个前十个列表对应于四个测试中的每个）。这些列表是根据去年会议上作者提出的例外条件标准创建的。在这十个月内发生了四次出轨，其中三起出现在排名前十的列表中（第一列表中的＃2，＃10和第四列表中的＃1）。最后，给出了量化和评估该系统与轨道几何形状之间的相互关系的仿真和实验分析。由于将相对挠度测量值映射到特定的轨道模量值，极端的轨道几何形状变化会产生误差。此效应也被量化和描述。

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  • 会议地点 Wilmington DE(US);Wilmington DE(US)
  • 作者

    Sheng Lu; Richard Arnold; William GeMeiner; Dwight Clark; Mahmood Fateh; Leith Al-Nazer; Gary Carr; Magdy El-Sibaie; Shane Farritor;

  • 作者单位

    Department of Mechanical Engineering University of Nebraska Lincoln Lincoln, NE 68588-0656;

    Department of Mechanical Engineering University of Nebraska Lincoln Lincoln, NE 68588-0656;

    Union Pacific Railroad Omaha, NE 68179;

    Union Pacific Railroad Omaha, NE 68179;

    Federal Railroad Administration Office of Research and Development 1200 New Jersey Avenue SE Washington, DC 20590;

    Federal Railroad Administration Office of Research and Development 1200 New Jersey Avenue SE Washington, DC 20590;

    Federal Railroad Administration Office of Research and Development 1200 New Jersey Avenue SE Washington, DC 20590;

    Federal Railroad Administration Office of Research and Development 1200 New Jersey Avenue SE Washington, DC 20590;

    Department of Mechanical Engineering University of Nebraska Lincoln Lincoln, NE 6858;

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