Acoustics & Noise Research Group, University of British Columbia, 3rd floor, 2206 East Mall, Vancouver, British Columbia V6T1Z3, Canada.
J Acoust Soc Am. 2012 Sep;132(3):1450-61. doi: 10.1121/1.4739461.
A beam-tracing model was used to study the acoustical responses of three empty, rectangular rooms with different boundary conditions. The model is wave-based (accounting for sound phase) and can be applied to rooms with extended-reaction surfaces that are made of multiple layers of solid, fluid, or poroelastic materials-the acoustical properties of these surfaces are calculated using Biot theory. Three room-acoustical parameters were studied in various room configurations: sound strength, reverberation time, and RApid Speech Transmission Index. The main objective was to investigate the effects of modeling surfaces as either local or extended reaction on predicted values of these three parameters. Moreover, the significance of modeling interference effects was investigated, including the study of sound phase-change on surface reflection. Modeling surfaces as of local or extended reaction was found to be significant for surfaces consisting of multiple layers, specifically when one of the layers is air. For multilayers of solid materials with an air-cavity, this was most significant around their mass-air-mass resonance frequencies. Accounting for interference effects made significant changes in the predicted values of all parameters. Modeling phase change on reflection, on the other hand, was found to be relatively much less significant.
采用光线跟踪模型研究了具有不同边界条件的三个空的矩形房间的声学响应。该模型基于波动理论（考虑声音相位），可应用于具有扩展反应表面的房间，这些表面由多层固体、流体或多孔弹性材料组成-这些表面的声学特性使用 Biot 理论计算。在各种房间配置中研究了三个房间声学参数：声强、混响时间和快速语音传输指数。主要目的是研究将表面建模为局部或扩展反应对这三个参数预测值的影响。此外，还研究了建模干扰效应的意义，包括研究表面反射时声音相位变化的影响。对于由多层组成的表面，特别是其中一层为空气时，将表面建模为局部或扩展反应非常重要。对于具有气腔的固体材料的多层，在其质量-空气-质量共振频率附近，这一点最为显著。考虑干扰效应会显著改变所有参数的预测值。另一方面，发现反射时的相位变化相对不太重要。
