A transient boundary element method model of Schroeder diffuser scattering using well mouth impedance.
A transient boundary element method model of Schroeder diffuser scattering using well mouth impedance.
复制标题
使用井口阻抗的施罗德扩散器散射的瞬态边界元方法模型。
DOI：
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发表时间：
2008
影响因子：
2.4
通讯作者：
T. Cox
中科院分区：
文献类型：
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作者：
J. Hargreaves;T. Cox
室内声学扩散器可用于处理关键的收听环境以改善声音质量。一个流行的类别是施罗德扩散器，其包括由薄翅片分隔的不同深度的威尔斯。本文涉及一种新的方法，使这些复杂的表面在时域中的建模。大多数情况下，漫射体散射预测使用稳态单频方法。一种流行的方法是使用包含扩散器的盒子的频域边界元法（BEM）模型，其中每个井的口部由具有适当表面阻抗的顺应性表面代替。然而，在时域预测模型（如瞬态边界元法）中表示柔顺表面的最佳方法目前尚未解决。基于表面阻抗的表示产生涉及未来声音的卷积核，因此与当前一代的时间推进瞬态BEM求解器不兼容。因此，本文提出了使用地面反射内核的建模以及行为，这是测试在时域边界元法的实施。新算法在两个表面上进行了验证，包括施罗德扩散器模型和准确的结果。人们希望这种表示可以扩展到任意顺应性的局部反应材料。
Room acoustic diffusers can be used to treat critical listening environments to improve sound quality. One popular class is Schroeder diffusers, which comprise wells of varying depth separated by thin fins. This paper concerns a new approach to enable the modeling of these complex surfaces in the time domain. Mostly, diffuser scattering is predicted using steady-state single frequency methods. A popular approach is to use a frequency domain boundary element method (BEM) model of a box containing the diffuser, where the mouth of each well is replaced by a compliant surface with appropriate surface impedance. The best way of representing compliant surfaces in time domain prediction models, such as the transient BEM is, however, currently unresolved. A representation based on surface impedance yields convolution kernels which involve future sound, so is not compatible with the current generation of time-marching transient BEM solvers. Consequently, this paper proposes the use of a surface reflection kernel for modeling well behavior and this is tested in a time domain BEM implementation. The new algorithm is verified on two surfaces including a Schroeder diffuser model and accurate results are obtained. It is hoped that this representation may be extended to arbitrary compliant locally reacting materials.