The Influence of Local Irregularities on the Vehicle–Track Interaction
The Influence of Local Irregularities on the Vehicle–Track Interaction
复制标题
局部不规则性对车辆轨道相互作用的影响
DOI：
10.1007/978-3-030-77234-5_20
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
Sebastian Rapp
中科院分区：
文献类型：
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作者：
Aditi Kumawat;Ullrich Martin;Sebastian Bahamon;Sebastian Rapp
轨道局部不平顺，如泥点，通常会引起轨道刚度的突变，从而在短时间内导致轨道几何劣化。运行中的列车与这种轨道缺陷的相互作用会在轨道系统中产生额外的动应力，这可能会对轨道结构的结构健康造成损害。本文提出了一种模拟均布移动荷载作用下轨道局部不平顺引起的轨道竖向加速度的解析方法。将轨道模型化为Pasternak型粘弹性地基轨道模型上的无限长连续Euler-Bernoulli梁。在沿轨道梁的任意给定位置，所考虑的基础模型的刚度和厚度分别表示轨道子结构刚度和轨道几何形状。为了模拟局部不规则性的影响，在基础模型的特定部分考虑了预定义的刚度和厚度变化。得到了轨道在均布运动(A)点荷载和(B)双质量振子系统作用下的时间域挠度/加速度响应。结果表明，局部不平顺可能会对轨道结构造成严重的损伤，导致乘坐舒适性差，在某些情况下甚至脱轨。
Local track irregularities such as mud spots generally cause a sudden variation in track stiffness, which leads to the track geometry degradation in a short period. The interaction of the moving train with such track defects induces additional dynamic stresses in the track system that may prove harmful for the structural health of the track structure. In this paper, an analytical approach is proposed to simulate the vertical track acceleration caused by a local track irregularity when subjected to a uniformly moving load. The railway track is modeled as an infinitely long continuous Euler–Bernoulli beam lying over a Pasternak-type viscoelastic foundation track model. At any given location along the rail beam, the stiffness and thickness of the considered foundation model, respectively, denote the track substructural stiffness and track geometry. To simulate the effects of local irregularities, a pre-defined variation of the stiffness and thickness is considered in a particular section of the foundation model. The time-domain deflection/acceleration responses are obtained for the railway track subjected to a uniformly moving (a) point load and (b) two-mass oscillator system. The results show that the local irregularities may cause significant damage to track structure, which may lead to poor ride comfort or in some cases, even derailment.