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On use of characteristic wavelengths of track irregularities to predict track portions with deteriorated wheel/rail forces

机译:使用轨道不规则的特征波长来预测车轮/轨道力下降的轨道部分

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摘要

The dynamic performance of the railway vehicles and the guiding tracks is mainly governed by the wheel-rail interactions, particularly in cases of track irregularities. In this work, a united model was developed to investigate the track portions subject to violent wheel/rail forces triggered by track irregularities at middle-low frequencies. In the modeling procedures, a time-frequency unification method combining wavelet transform and Wigner-Ville distribution for characterizing time-frequency characteristics of track irregularities and a three-dimensional nonlinear model for describing vehicle-track interaction signatures were developed and coupled, based on which the method for predicting track portions subject to deteriorated wheel/rail forces was proposed. The theoretical models developed in this paper were comprehensively validated by numerical investigations. The significance of this present study mainly lies on offering a new path to establish correlation and realize mutual prediction between track irregularity and railway system dynamics.
机译:铁路车辆和导轨的动态性能主要受轮轨相互作用的影响,特别是在轨道不规则的情况下。在这项工作中,开发了一个联合模型来研究受中低频率轨道不规则触发的剧烈车轮/轨道力作用的轨道部分。在建模过程中,开发并结合了一种将小波变换和Wigner-Ville分布相结合的时频统一方法来表征轨道不规则性的时频特性,并建立了一个用于描述车辆-轨道相互作用特征的三维非线性模型,在此基础上,提出了一种预测轮/轨力下降的轨道部分的方法。本文开发的理论模型通过数值研究得到了全面验证。本研究的意义主要在于提供一条新的途径,以建立相关性并实现轨道不平顺与铁路系统动力学之间的相互预测。

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