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Efficient outdoor sound propagation modeling with the finite-difference time-domain (FDTD) method: a review

机译:使用有限差分时域(FDTD)方法进行高效的户外声音传播建模:综述

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摘要

The finite-difference time-domain (FDTD) method, solving the inhomogeneous, moving medium sound propagation equations, also referred to as the Linearized Euler(ian) Equations (LEE), has become a mature reference outdoor sound propagation model during the last two decades. It combines the ability to account for complex wave effects like reflection, scattering and diffraction near arbitrary objects, and complex medium effects like convection, refraction and (turbulent) scattering. In addition, it has the general advantages of a time-domain method. It is indicated that the numerical discretisation scheme should be chosen depending on the flow speed of the background medium. Perfectly matched layers, applicable to cases in presence of (non-) uniform flow, are state-of-the-art perfectly absorbing boundary conditions that are key in outdoor sound propagation applications, where only a small part of the unbounded atmosphere can be numerically described. Various ways to include outdoor soils are summarized, like time-domain impedance plane boundary conditions and explicitly including the upper part of the soil in the simulation domain. Approaches for long-distance sound propagation, including moving calculation frames and hybrid modeling are discussed. This review deals with linear sound propagation only.
机译:有限差分时域(FDTD)方法解决了不均匀的运动介质声音传播方程,也称为线性Euler(ian)方程(LEE),在最近两个阶段已成为成熟的参考室外声音传播模型几十年。它结合了解决复杂波效应(如在任意物体附近的反射,散射和衍射)以及复杂介质效应(如对流,折射和(湍流)散射)的能力。另外,它具有时域方法的一般优势。指出应根据背景介质的流速选择数值离散方案。完美匹配的层适用于(非)均匀流动的情况,是最先进的,完美吸收边界条件,这在室外声音传播应用中非常关键,在该应用中,只有一小部分无边界大气可以在数值上描述。总结了包括室外土壤在内的各种方法,例如时域阻抗平面边界条件,并在模拟域中明确包括了土壤的上部。讨论了长距离声音传播的方法,包括移动计算框架和混合建模。本文仅涉及线性声音传播。

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    Van Renterghem, Timothy;

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  • 年度 2014
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  • 原文格式 PDF
  • 正文语种 eng
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