Wheel–rail impact and the dynamic forces at discrete supports of rails in the presence of singular rail surface defects
Wheel–rail impact and the dynamic forces at discrete supports of rails in the presence of singular rail surface defects
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DOI：
10.1177/0954409711413975
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发表时间：
2012-03
期刊：
影响因子：
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通讯作者：
X. Zhao;Z. Li;J. Liu
中科院分区：
文献类型：
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作者：
X. Zhao;Z. Li;J. Liu
一个有效的三维（3D）瞬态有限元模型被用来评估奇异的轨道表面缺陷处的轮轨冲击和由此产生的高频动态力在轨道的离散支撑。建立了一个典型的有碴轨道模型，其中钢轨的支承由轨枕、轨枕和道碴组成。考虑车辆的一系悬挂。为了包括车辆-轨道系统的所有重要特征，轮对、钢轨和轨枕都使用三维实体单元进行网格化。采用时域内的面-面接触算法求解轮轨瞬态滚动接触。通过模拟轮对在光滑轨道上的稳态滚动，首先将离散支承处的竖向力分布与Zimmermann解进行了比较。然后，应用钢轨表面缺陷计算了不同轧制速度下轮轨界面和钢轨离散支座处的动态力。所获得的动态响应证实了使用这样一个详细的模型进行调查的必要性。
A validated three-dimensional (3D) transient finite element model is used to evaluate the wheel–rail impact at singular rail surface defects and the resulted high-frequency dynamic forces at the discrete supports of the rail. A typical ballasted railway track is modeled, in which the supports of the rail are composed of the fastenings, the sleepers, and the ballast. The primary suspension of the vehicle is considered. To include all the important eigen characteristics of the vehicle–track system, the wheel set, the rail, and the sleepers are all meshed using 3D solid elements. The transient wheel–rail rolling contact is solved using a surface-to-surface contact algorithm in the time domain. By simulating the steady-state rolling of a wheel set on a smooth rail, the vertical force distribution at the discrete supports is first compared with Zimmermann solution. Afterward, rail surface defects are applied to calculate the resulted dynamic forces at thewheel–rail interface and at the discrete supports of the rail under different rolling speeds. The obtained dynamic responses confirm the necessity of using such a detailed model for the investigations.