Dynamic behavior of an embedded rail track coupled with a tram vehicle
Dynamic behavior of an embedded rail track coupled with a tram vehicle
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DOI：
10.1177/1077546315616521
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发表时间：
2017-08
影响因子：
2.8
通讯作者：
Liang Ling;Jian Han;Xin-biao Xiao;Xue-song Jin
中科院分区：
文献类型：
--
作者：
Liang Ling;Jian Han;Xin-biao Xiao;Xue-song Jin
研究了埋地轨道与有轨电车耦合时的动力特性。介绍了我国首次引入的一种新型埋入式轨道结构，并讨论了埋入式轨道(ERT)和另一种紧固板轨道(FST)的振动试验结果。基于多体动力学方法和有限元方法，建立了有轨电车与嵌入轨道耦合的三维动力学模型。在该模型中，有轨电车被建模为多体系统。将埋地钢轨模拟为由两根钢轨、填充材料、板和板下的调整层组成的两层体系。将钢轨视为连续弹性支承的Timoshenko梁，采用振型叠加法对梁的偏微分方程组进行降阶处理。用连续粘弹性单元表示钢轨与板之间的填充材料和轨垫。采用三维有限元方法对混凝土板进行建模，并采用振型叠加法提高计算效率。采用均匀粘弹性单元模拟混凝土板下的弹性层。然后将所提出的模型应用于与传统紧固板式轨道相比，比较了新型埋入式轨道的动力响应。计算结果表明，新型埋入式轨道在降低轮轨动作用力、降低轨道部件的振级和变形、减少轨道缺陷和损伤等方面优于紧固式板式轨道。
This paper presents an investigation into the dynamic behavior of an embedded rail track coupled with a tram vehicle in time domain. A new designed embedded rail track structure firstly introduced into the Chinese tramways is described and the results of vibration tests of the embedded rail track (ERT) and another fastened slab track (FST) are discussed. A three-dimensional (3D) dynamic model of a tram vehicle coupled with an embedded rail track was developed on the basis of the multi-body dynamics approach and the finite element method. In the model, the tram vehicle was modeled as a multi-body system. The embedded rail track was modeled as a two layer system consisting of two rails, filling material, slabs, and adjustment layer beneath slabs. The rails were treated as Timoshenko beams with continuous elastic supports, in which the modal superposition method was used to reduce the order of the partial differential equations of beams. Continuous viscoelastic elements were used to represent the filling material and rail pad that connecting the rails and the slabs. The concrete slabs were modelled using the 3D finite element method, while the modal superposition method was adopted to improve the computational efficiency. Uniformly viscoelastic elements were introduced to model the elastic layer beneath the concrete slabs. The proposed model was then applied to compare the dynamic response of the innovative embedded rail track with respect to a conventional fastened slab track. The numerical results indicate that the innovative embedded rail track has advantages over the fastened slab track for its potentialities to reduce the dynamic wheel/rail force, the vibration level and deformation of the track parts, and the track defects and damages.