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State dependent properties of rail pads

机译：滑轨垫的状态相关属性

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摘要

A rail pad is one of the main components in ballasted railway track systems. It is inserted between the rail and the sleeper to attenuate dynamic wheel/rail interaction forces, preventing the underlying railway track components from excessive stresses. Generally, the dynamic design of tracks relies on the available data, which are mostly focused on the structural condition at a specific toe load. Recent findings show that track irregularities could significantly amplify the loads on railway tracks. This phenomenon gives rise to a concern that the rail pads may experience higher deterioration rate than anticipated in the past. On this ground, an innovative test rig for estimating the dynamic properties of rail pads has been devised at the University of Wollongong. A non-destructive methodology for evaluating and monitoring the dynamic properties of the rail pads has been developed based on an instrumented hammer impact technique and an equivalent single degree-of-freedom system approximation. This investigation focuses on the state-dependent model of rail pads where the dependent effects of frequency and static load contents can be distinguished. Based on the impact-excitation responses, the analytical state-dependent model was applied to best fit the experimental modal measurements that were performed in a frequency range of 0-500 Hz. The curve fitting gives such dynamic parameters as the effective mass, dynamic stiffness and dynamic damping constant, all of which are required for modern numerical modelling of a railway track.
机译：道轨垫板是道ball轨道系统中的主要组件之一。它被插入轨道和轨枕之间，以减弱车轮/轨道之间的动态相互作用力，从而防止下方的铁轨部件受到过大的应力。通常，轨道的动态设计依赖于可用数据，这些数据主要集中在特定脚趾载荷下的结构条件。最近的发现表明，轨道不平整会显着放大铁路轨道上的负荷。这种现象引起了人们的担忧，即铁轨垫的劣化率可能比过去预期的更高。在此基础上，卧龙岗大学设计了一种创新的试验台，用于估算导轨垫的动态性能。基于仪器化的锤击技术和等效的单自由度系统近似，已经开发出了一种用于评估和监视滑轨垫动态特性的非破坏性方法。这项研究集中在状态相关的导轨垫模型上，其中可以区分频率和静载荷含量的相关影响。基于冲击激励响应，分析状态相关模型适用于最适合在0-500 Hz频率范围内进行的实验模态测量。曲线拟合给出了诸如有效质量，动态刚度和动态阻尼常数之类的动态参数，这些都是现代铁路轨道数值建模所必需的。

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  • 来源
    《Transport Engineering in Australia》 |2009年第1期|17-24|共8页
  • 作者

    S Kaewunruen; AM Remennikov;

  • 作者单位

    RailCorp - Track Engineering, Sydney, NSW;

    School of Civil, Mining and Environmental Engineering, Faculty of Engineering, University of Wollongong, Wollongong, NSW;

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