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arXiv 2201.12050math.NAcs.CEcs.NA
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有限周期结构声学分析的快速多极边界元法

Fast multipole boundary element method for the acoustic analysis of finite periodic structures

Christopher Jelich, Wenchang Zhao, Haibo Chen, Steffen Marburg

摘要:

本文提出了有限周期结构线性时谐声学分析的两种快速多极边界元列式。有限周期性结构由在一个或多个周期性方向上的有限数量的单位单元复制组成。这种结构可以被设计成有效地控制和操纵声波,并被称为声学超材料或声波晶体。我们的方法将几何体细分为对应于单位单元的盒子。应用边界元离散化,并通过快速多极展开来近似分离良好的盒子之间的相互作用。由于基本几何的周期性,展开式的某些算子变成块Toeplitz矩阵。这允许将矩阵-向量乘积表示为循环卷积,这显著减少了计算工作量和总体内存需求。所提出的技术的效率示出基于声散射问题。此外,还对声屏障的设计进行了研究,并将壁状声屏障的性能与两种声波晶体声屏障的性能进行了比较。

英文摘要:

In this work, two fast multipole boundary element formulations for the linear time-harmonic acoustic analysis of finite periodic structures are presented. Finite periodic structures consist of a bounded number of unit cell replications in one or more directions of periodicity. Such structures can be designed to efficiently control and manipulate sound waves and are referred to as acoustic metamaterials or sonic crystals. Our methods subdivide the geometry into boxes which correspond to the unit cell. A boundary element discretization is applied and interactions between well separated boxes are approximated by a fast multipole expansion. Due to the periodicity of the underlying geometry, certain operators of the expansion become block Toeplitz matrices. This allows to express matrix-vector products as circular convolutions which significantly reduces the computational effort and the overall memory requirements. The efficiency of the presented techniques is shown based on an acoustic scattering problem. In addition, a study on the design of sound barriers is presented where the performance of a wall-like sound barrier is compared to the performance of two sonic crystal sound barriers.

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