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Correlating track forces and track profile

机译：关联轨道力和轨道轮廓

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摘要

Wheel/rail dynamic forces are dependent upon the characteristics of both train and track, and lead to time-dependent degradation of the track. The quality of maintenance of both train and track affect the amplitude of these forces and therefore the rate of degradation of track. These relationships are being studied at Queensland University of Technology via a Rail CRC project, using test track and test vehicles provided by QR. A central part of the study is attempting to relate wheel/rail forces to the longitudinal vertical profile of the track; the profile is measured by QR’s Track Recording Car (TRC) and their Corrugation Analysis Trolley (CAT). However, because doing detailed measurements of the longitudinal profile frequently over the study period is impractical, the authors developed an innovative algorithm that converts track recording car (TRC) rail top offset measurements into suitably accurate longitudinal profiles. The study takes those profiles and correlates them against the vertical wheel-rail forces measured by the test vehicle. But those forces are comprised of many continuously varying frequencies and amplitudes and the track profile varies significantly in position and time, making correlations between them quite complex. The authors have therefore drawn on signal processing principles that convert data into power spectral density plots and then apply a function known as coherence. The study has found that at low frequencies, there is very strong correlation between forces and track profile, as would be expected. However, there is diminishing correlation as frequencies increase. This has implications for relating bogie characteristics to track degradation.
机译：车轮/轨道动态力取决于火车和轨道的特性，并导致轨道随时间的退化。列车和轨道的维护质量都会影响这些力的幅度，从而影响轨道的退化速度。昆士兰科技大学通过Rail CRC项目正在研究这些关系，使用QR提供的测试轨道和测试车辆。研究的中心部分试图将车轮/铁道力与轨道的纵向垂直轮廓联系起来。该配置文件由QR的跟踪记录车（TRC）及其波纹分析台车（CAT）进行测量。但是，由于在研究期内频繁进行纵向轮廓的详细测量是不切实际的，因此作者开发了一种创新的算法，可将轨道记录车（TRC）轨道顶部偏移测量结果转换为合适的精确纵向轮廓。研究采用了这些轮廓，并将它们与测试车辆测得的垂直轮轨力相关联。但是这些力是由许多连续变化的频率和振幅组成的，并且轨迹的位置和时间变化很大，这使得它们之间的相关性非常复杂。因此，作者利用了信号处理原理，将数据转换为功率谱密度图，然后应用了称为相干性的函数。研究发现，在低频情况下，如预期的那样，力与轨道轮廓之间存在非常强的相关性。但是，随着频率的增加，相关性逐渐降低。这暗示了将转向架特性与跟踪退化相关联。

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    Hawari Haitham M.; Murray Martin H.;

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  • 年度 2006
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  • 正文语种 {"code":"en","name":"English","id":9}
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