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A finite element methodology to model flexible tracks with arbitrary geometry for railway dynamics applications
Computers & Structures ( IF 4.7 ) Pub Date : 2021-06-03 , DOI: 10.1016/j.compstruc.2021.106519
J. N. Costa , P. Antunes , H. Magalhães , J. Pombo , J. Ambrósio

The dynamic analysis of railway vehicles requires an accurate representation of the vehicle, the track geometry and structure, and their interaction. Generally, flexible tracks models with curved geometries represent the rails with straight beam elements, which results in a piecewise linear representation of the rails. As a result, the wheel-rail contact mechanics are not properly captured, and the wheel-rail contact forces present spurious high-frequency oscillations. This work proposes a novel approach to model flexible railway tracks with arbitrary geometries, in which the correct geometry in the wheel-rail contact mechanics is assured by modeling the rails as Timoshenko curved beam elements. This approach improves both the geometric representation of the rails and the accuracy of the wheel-rail contact forces calculation. A realistic operation scenario in which a multibody model of a railway vehicle runs on a flexible track with a curved geometry is used here to present the novel aspects of this work and discuss the improvements over the conventional approaches. The results show that the proposed methodology greatly improves the computation of the wheel-rail forces and prevents spurious oscillations from propagating to the vehicle.



中文翻译:

为铁路动力学应用模拟具有任意几何形状的柔性轨道的有限元方法

铁路车辆的动态分析需要对车辆、轨道几何形状和结构以及它们之间的相互作用进行准确表示。通常,具有弯曲几何形状的柔性轨道模型表示具有直梁元素的轨道,这会导致轨道的分段线性表示。结果,轮轨接触力学没有被正确捕捉,轮轨接触力呈现虚假的高频振荡。这项工作提出了一种对具有任意几何形状的柔性铁路轨道进行建模的新方法,其中通过将轨道建模为 Timoshenko 弯曲梁单元来确保轮轨接触力学中的正确几何形状。这种方法改进了轨道的几何表示和轮轨接触力计算的准确性。这里使用了一个现实的操作场景,其中铁路车辆的多体模型在具有弯曲几何形状的柔性轨道上运行,以展示这项工作的新颖方面,并讨论对传统方法的改进。结果表明,所提出的方法大大改进了轮轨力的计算,并防止了虚假振荡传播到车辆。

更新日期:2021-06-03
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