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Modeling of radiation damping and transient transmitting boundary

机译：辐射衰减和瞬态传输边界的建模

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摘要

One of the primary obstacles in formulating an accurate yet inexpensive procedure for dynamic soil-structure interaction analysis is the modeling of the unbounded medium beneath the structure. Various available techniques could be classified into a rigorous approach and an approximate approach. The rigorous boundaries are usually formulated in frequency domain, and are computationally demanding owing to the non-local nature of such boundaries and the computation of the boundary terms. The approximate boundaries are formulated directly in the time domain and these are local in space and time. Among the various transmitting boundaries, the extrapolation algorithm has been reported to yield very good results. While removing the shortcomings associated with this boundary, a new formulation of transient transmitting boundary based on an extrapolation algorithm in two-dimensions, has been proposed in this study. A numerical experiment has been selected for the verification of the proposed model with different boundary types including extended mesh, viscous boundary, and the cone model. It has been found that the response predicted on basis of the proposed model compares very well with that of the extended mesh and the cone boundary.
机译：制定准确而廉价的动态土-结构相互作用分析程序的主要障碍之一是对结构下面无边界介质的建模。各种可用技术可以分为严格方法和近似方法。严格的边界通常是在频域中制定的，由于这种边界的非局部性质和边界项的计算，因此对计算的要求很高。近似边界直接在时域中制定，并且在空间和时间上都是局部的。在各种传输边界中，据报道外推算法产生了很好的结果。在消除与该边界有关的缺点的同时，本研究提出了一种基于二维外推算法的瞬态传输边界的新公式。选择了一个数值实验来验证具有不同边界类型（包括扩展网格，粘性边界和圆锥模型）的建议模型。已经发现，基于所提出的模型预测的响应与扩展网格和圆锥边界的响应非常好。

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