Field Test Research and Numerical Simulation on Aerodynamic Deloading Characteristics of V-Shaped Noise Barrier

IF 0.8 4区工程技术 Q4 ACOUSTICS

International Journal of Acoustics and Vibration Pub Date : 2019-12-31 DOI:10.20855/ijav.2019.24.41468

J. Zhao, Ning Zhi, Lü Ming

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引用次数: 1

Abstract

With the rapid development of the high-speed railway in China, the problems of the noise pollution induced by passing trains emerge. Theoretically, the V-shaped noise barrier is of pretty good performance of noise-reduction and load-shedding. To assess the practical aerodynamic deloading characteristics of the V-shaped noise barrier, a full-scale field test was carried out at three measuring-sections equipped with noise barriers of different heights. In order to quantify the research work, the impact strength and deloading rate were selected as indicators. The effects of train speeds, train types and barrier heights are studied. This study includes the variations of impact strength and deloading rate in vertical directions. Meanwhile, 2D numerical simulation research is conducted to analyze the experimental results from the angle of mechanism. It is observed that the aerodynamic load acting on the surface of the V-shaped noise barrier was weaker and more uniform compared with conventional barrier. The flow field distribution influenced the deloading characteristics of the V-shaped noise barrier significantly. Moreover, the load-shedding effect of V-shaped noise barrier, when CRH380AM passed by, was slightly better than CRH380A. The deloading rate improved with the increasing of the noise barrier height in general.

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V型声屏障气动减载特性的现场试验研究与数值模拟

随着我国高速铁路的快速发展，过往列车的噪声污染问题日益突出。从理论上讲，V型声屏障具有良好的降噪和甩负荷性能。为了评估V形隔音屏障的实际空气动力学减载特性，在配备不同高度隔音屏障的三个测量段进行了全尺寸现场试验。为了量化研究工作，选择了冲击强度和减载率作为指标。研究了列车速度、列车类型和护栏高度的影响。本研究包括冲击强度和减载率在垂直方向上的变化。同时，从机构角度对实验结果进行了二维数值模拟研究。观察到，与传统屏障相比，作用在V形噪声屏障表面的气动载荷较弱且更均匀。流场分布对V型声屏障的减载特性有显著影响。此外，当CRH380AM经过时，V形噪声屏障的减载效果略好于CRH380A。减载率总体上随着噪声屏障高度的增加而提高。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Acoustics and Vibration ACOUSTICS-ENGINEERING, MECHANICAL

CiteScore

1.60

自引率

10.00%

发文量

审稿时长

12 months

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