Shadowing Effect of Rail Transit U-shaped Girders on Wheel-rail Noise

被引：0
|
作者：
Zhang X. [1 ]
Ruan L. [1 ]
Cao Z. [1 ]
Zhou X. [1 ]
Li X. [1 ]
机构：
[1] Department of Bridge Engineering, Southwest Jiaotong University, Chengdu
来源：
Tiedao Xuebao/Journal of the China Railway Society | 2019年 / 41卷 / 07期
关键词：
Box-shaped girder; Rail transit; Shadowing effect; U-shaped girder; Wheel-rail noise;
D O I：
10.3969/j.issn.1001-8360.2019.07.019
中图分类号：
学科分类号：
摘要：
One of the predominant noise sources of a train operating at low-and medium-speeds is wheel-rail noise. The U-shaped girder is a through type structure, whose webs on both sides of the girder function as low-rise sound barriers, which can shield the wheel-rail noise to a certain extent due to the shadowing effect. Based on the boundary element method (BEM) and comparative analyses on a box-shaped girder, this paper focused on the qualitative analyses and influence factor studies of the shadowing effect. Firstly, the shadowing effect of a simple obstacle was analyzed to validate the precision of BEM simulation analysis. Next, two-dimensional BEM models of a box-shaped girder and an U-shaped girder were built respectively according to the similar approach, in which the measured train noise was defined as the noise source, and the shadowing loss index was defined to represent the difference of sound pressure levels between a box-shaped girder and an U-shaped girder for specific noise receivers. Thirdly, the influences of ground-induced sound reflection and spectral characteristics of the noise source on the simulated results were discussed. At last, the influence of the top flange width, web height and web inclination angle of the U-shaped girder on the shadowing loss was studied using parameter analysis. Results show that the ground-induced sound reflection has little impact on the shadowing loss index. For noise receivers that are not higher than the rail surface and perpendicular to the railway center line at a distance of 30 m, the shadowing loss indices are about 8 to 10 dB(A). The predominant factor that influences the shadowing loss index is the web height. © 2019, Department of Journal of the China Railway Society. All right reserved.
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页码：147 / 154
页数：7
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