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首页> 外文期刊>Acta acustica united with acustica >Dynamic Simulation of Traffic Noise by Applying Ray Tracing Method based on Indoor Space Partitioning
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Dynamic Simulation of Traffic Noise by Applying Ray Tracing Method based on Indoor Space Partitioning

机译：基于室内空间划分的光线追踪法动态模拟交通噪声

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摘要

This study presents a revised 3 dimensional ray tracing method by combining with indoor space partitioning. This method divides an entire indoor space into limited convex polyhedron subspaces, and thus reduces the number of surfaces intersected with rays, and omits the validity test of the collision point on the reflecting surfaces. Combining with a microscopic traffic simulation tool and a vehicle noise emission model, and taking the influence of diffraction into account, the method can be utilized inulating dynamically the process of traffic noise diffusing inside the building through windows. Meanwhile, this study selects two different types of architectural layouts in order to demonstrate this method's efficiency, the influence of diffraction and of the state of windows, the differences in indoor noise on different floors and the comparison of indoor and outdoor traffic noise distribution. A comparison study on before-and-after indoor space partitioning shows that the method is efficient, with about 60% optimization rate. Further, with windows open, the level difference between average indoor and outdoor traffic noise is 7.5 dB, while it can reach to 12.8 dB with windows closed.
机译：本研究结合室内空间划分，提出了一种改进的三维射线追踪方法。该方法将整个室内空间划分为有限的凸多面体子空间，从而减少了与光线相交的表面的数量，并省略了反射面上碰撞点的有效性测试。结合微观交通仿真工具和车辆噪声排放模型，并考虑到衍射的影响，该方法可用于动态地对交通噪声通过窗户扩散到建筑物内部的过程进行计算。同时，本研究选择了两种不同类型的建筑布局，以证明该方法的效率，衍射和窗户状态的影响，室内噪声在不同楼层上的差异以及室内外交通噪声分布的比较。对室内前后空间分配的比较研究表明，该方法是有效的，优化率约为60％。此外，在窗户打开的情况下，室内和室外交通噪声之间的平均电平差为7.5 dB，而在关闭窗户的情况下，噪声水平可达12.8 dB。

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