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3D BEM and FEM simulations applied to stray current interference problems. A uniquecoupling mechanism that takes the best of both methods

机译:3D BEM和FEM仿真应用于杂散电流干扰问题。结合了两种方法的独特的耦合机制

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In this paper it will be demonstrated how a Boundary Element Method (BEM) model based onrnso-called pipe elements and a Finite Element Method (FEM) model that is limited in space canrnbe coupled to study local effects on 3D structures in half space.rnThe main idea is to replace the original 3D structure with an "equivalent pipeline network" thatrnis used in the BEM model to calculate the complete DC-traction interference problem. In thernFEM code on the other hand, an "equivalent bounding box" that surrounds the complete 3Drnstructure is defined. The potential distribution on this bounding box is calculated using the BEMrnmodel and applied as boundary condition for the actual FEM calculation on the original 3Drnstructure.rnThis new approach is applied and validated on a typical underground car park geometry made ofrnsteel sheet walls that exhibits stray current interference from a neighbouring DC-traction system.rnIt has been demonstrated that this unique coupling technique works very well and allows tornmodel local effects on 3D structures influenced by large DC-traction systems.
机译:在本文中,将演示如何耦合基于所谓的管道元素的边界元方法(BEM)模型和受空间限制的有限元方法(FEM)模型,以研究半空间中对3D结构的局部影响。主要思想是用在BEM模型中用来计算完整的直流牵引干扰问题的“等效管道网络”替换原始3D结构。另一方面,在FEM代码中,定义了包围整个3Drn结构的“等效边界框”。使用BEMrnmodel计算此边界框上的电位分布,并将其用作边界条件,以对原始3Drn结构进行实际FEM计算。rn此新方法已应用于并验证了典型的由钢板薄壁制成的地下停车场几何体,该几何体表现出杂散电流干扰已经证明,这种独特的耦合技术非常有效,并且可以在受大型DC牵引系统影响的3D结构上撕裂模型局部效应。

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