NUMERICAL STUDY ON SOUND PROPAGATION FROM DEPRESSED/SEMI-UNDERGROUND ROADS

NUMERICAL STUDY ON SOUND PROPAGATION FROM DEPRESSED/SEMI-UNDERGROUND ROADS
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凹陷/半地下道路声音传播的数值研究

DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
H. Tachibana
H. Tachibana
中科院分区：
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文献类型：
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作者：
S. Sakamoto;H. Tachibana

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凹陷或半地下道路的噪声传播是非常复杂的，因为在建筑物内的多次反射。在日本声学学会提出的道路交通噪声预测模型Model- 1998中，这种多次反射的影响是通过将侧壁反射的一系列图像源的贡献相加来计算的。然而，在具有相当大悬挑的半地下道路的情况下，由于几何声学的适用性的限制，该方法不能应用。在这种情况下，基于波动理论的其他方法是必要的。在这项研究中，声传播从各种类型的凹陷或半地下道路使用二维有限差分法进行了研究。采用瞬态声传播数值分析和可视化技术，研究了不同截面形状下声传播的差异，以及墙体、顶棚和排水沥青路面吸声处理对声传播的影响。此外，为了简化噪声预测方法，研究了模拟半地下道路开口噪声辐射的假设声源模型。(A)有关覆盖摘要，请参见ITRD E113232。
Noise propagation from depressed or semi-underground roads are much complicated because of multiple reflection inside the constructions. In the prediction model of road traffic noise, - Model- 1998 - proposed by the Acoustical Society of Japan, the effect of such multiple reflection is calculated by summation of the contributions from a series of image sources mirrored by the sidewalls. In case where a semi-underground road with considerably large overhangs, however, the method cannot be applied because of the limitation of applicability of geometrical acoustics. In such a case, other approaches based on wave theory are necessary. In this study, sound propagation from various types of depressed or semi-underground roads is investigated using 2- dimensional Finite Difference Method. Differences of sound propagation due to a variety of the shapes in cross section, effects of absorption treatment of walls, ceilings and drainage asphalt pavement on the road surfaces are studied by numerical analysis and visualization technique of transient sound propagation. In addition, aiming to make a simplified noise prediction method, modeling of hypothetical sound sources to simulate noise radiation from opening of semi-underground road is studied. (A) For the covering abstract see ITRD E113232.