| 高速铁路声屏障插入损失影响因素及规律 |
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| 引用本文： | 周信,肖新标,何宾,韩珈琪,温泽峰,金学松.高速铁路声屏障插入损失影响因素及规律[J].西南交通大学学报,2014,27(6):1024-1031. |
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| 作者姓名： | 周信 肖新标 何宾 韩珈琪 温泽峰 金学松 |
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| 基金项目： | 国家科技支撑计划资助项目(2009BAG12A01-B06)国家863计划资助项目(2011AA11A103-4-2)教育部创新团队项目(IRT1178, SWJTU12ZT01)四川省科技支撑计划资助项目(2010GZ0226) |
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| 摘 要： | 为研究声屏障降噪的主要影响因素及规律,基于边界元理论,结合高速列车实测声源识别结果,建立了高速铁路声屏障降噪效果预测模型,研究了包括高速列车不同位置声源、声屏障高度、声屏障截面形状和吸声边界条件对插入损失的影响,并在此基础上提出了对现役声屏障结构的改进方案.研究结果表明,列车声源高度对声屏障插入损失有重要影响,现有2.15 m高声屏障只对车体下方噪声有降噪效果;随着声屏障高度增加,插入损失逐渐增大,声屏障高于6.15 m时,插入损失达到25 dB(A)以上;对于不同截面形式的声屏障,降噪效果从优到劣依次为Y型、倾斜型、T型、外折型、直立型和内折型,其中Y型比直立型插入损失高0.7~1.5 dB(A);对于任一类型声屏障,吸声引起的具体降噪效果与声屏障形式有关,有吸声边界条件的降噪效果要优于"刚性光滑"边界条件,前者与后者相比,其插入损失可提高0.3~6.4 dB(A).
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| 关 键 词： | 高速铁路 噪声源 声屏障 插入损失 边界元方法 |
| 收稿时间： | 2014-01-17 |
Influential Factors and Rules for Insertion Loss of High-Speed Railway Noise Barriers |
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| ZHOU Xin,XIAO Xinbiao,HE Bin,HAN Jiaqi,WEN Zefeng,JIN Xuesong.Influential Factors and Rules for Insertion Loss of High-Speed Railway Noise Barriers[J].Journal of Southwest Jiaotong University,2014,27(6):1024-1031. |
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| Authors: | ZHOU Xin XIAO Xinbiao HE Bin HAN Jiaqi WEN Zefeng JIN Xuesong |
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| Abstract: | Based on the boundary element method and the train noise sources identified by a beam-forming noise source system, a numerical prediction model was established to study the factors and rules relevant to the insertion loss of high-speed railway noise barriers. The effects of noise source locations, noise barrier heights, shapes, and absorbing boundary conditions were investigated. The improvement strategies based on the current structure of noise barriers were proposed. The numerical results show that the noise source height has a significant effect on the sound barrier performance. The sound barrier of 2.15 m height can only reduce noise coming from the lower part of the train. The insertion loss increases with the noise barrier height. When the height exceeds 6.15 m, the insertion loss reaches over 25 dB(A). The sound barriers with different cross sections are listed, according to their noise attenuation effect, i.e., Y-shaped barrier, tilted barrier, T-shaped barrier, inward folded barrier, vertical barrier and outward folded barrier. The Y-shaped barrier produces the highest performance with an increase of 0.7~1.5 dB(A) in insertion loss compared with the vertical barrier. Despite the shape of noise barriers, the absorbing boundary overall lead to more noise reduction than the smooth rigid boundary, but the noise reduction amount relates to the forms of sound barriers ranging from 0.3 to 6.4 dB(A). |
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