Due to their disproportionate geometries and uneven distribution of sound, the interior sound field analysis of subway stations has always been challenging. The field necessitates reliable tools for real-case design applications, while the research and discussions on the topic are still ongoing. This study compares two major room acoustics simulation approaches, namely ray tracing and diffusion equation modeling (DEM) in order to assist future acoustical designs of subway stations. Two cases of Istanbul Metropolitan metro lines are selected, namely station BAG with a circular cross section and station USK with rectangular cross section. The reverberation time and relative sound pressure level results from field tests are compared with those obtained by the ray tracing and DEM. The results emphasized the validity as well as limitations of each method over discussed metrics with given geometric layouts and material characteristics of the subway stations.

中文翻译：

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地铁车站室内声学设计中射线追踪和扩散方程建模的比较评估

由于其不对称的几何形状和声音的不均匀分布，地铁站的内部声场分析一直是具有挑战性的。该领域需要用于实际案例设计应用程序的可靠工具，而有关该主题的研究和讨论仍在进行中。这项研究比较了两种主要的室内声学模拟方法，即光线追踪和扩散方程建模（DEM），以协助地铁站的未来声学设计。选择了伊斯坦布尔大都会地铁线的两种情况，分别是圆形横截面的BAG站和矩形横截面的USK站。将现场测试得到的混响时间和相对声压级与通过射线追踪和DEM获得的混响时间和相对声压级进行了比较。