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首页> 外文期刊>Applied Acoustics >Influence of vehicle noise emission directivity on sound level distribution in a canyon street. Part Ⅰ: Simulation program test
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Influence of vehicle noise emission directivity on sound level distribution in a canyon street. Part Ⅰ: Simulation program test

机译：车辆噪声发射方向性对峡谷街道声级分布的影响。第一部分：仿真程序测试

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Simulation programs may be useful tools for controlling an environmental noise. The computer simulation program PROP11 that enables predictions of the time-average sound level within an urban system is used here. A roadway as a noise source is represented by a sum of the sound exposures due to individual vehicle pass-bys. Different representations of equivalent point sources for various classes of vehicles are allowed including directivity characteristics other than omnidirectional. Propagation throughout an urban system contains multi-reflections from the walls and single and double diffraction at their edges. In this paper, the PROP11 program is used to predict the sound level between opposing facades of buildings in a canyon street. A multi-lane road is assumed to contain two classes of vehicles (light and heavy) ones. The equivalent source representing vehicles is defined by the source power spectrum, its position above the ground and directivity characteristics. The consequences of introducing equivalent source directivity are analyzed.
机译：仿真程序可能是用于控制环境噪声的有用工具。这里使用的计算机模拟程序PROP11可以预测城市系统内的时间平均声音水平。作为噪声源的巷道由各个车辆通过引起的声音总和来表示。允许用于各种类型的车辆的等效点源的不同表示形式，包括除全向以外的方向性特征。整个城市系统的传播都包含墙壁的多次反射以及边缘的单次和双次衍射。在本文中，PROP11程序用于预测峡谷街道中建筑物相对立面之间的声级。假定多车道道路包含两类车辆（轻型和重型）。代表车辆的等效源由源功率谱，其在地面上方的位置和方向性特征定义。分析了引入等效源方向性的后果。

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