固定点声源作用下高速公路隧道内噪声声场分布特性研究

发布时间：2018-06-21 05:28

本文选题：有限元法 + 公路隧道　；参考：《北京交通大学》2014年硕士论文

【摘要】：随着我国隧道建设的快速发展,隧道内的噪声问题越来越引起人们的关注。国内外对公路隧道内的噪声预测研究较多,而对隧道内噪声声场的分布规律研究较少。隧道宽度通常为十几米到几十米,与隧道宽度相比声波波长不能忽略,需要从波动声学理论进行分析。而对于隧道这种长空间的半封闭声场,有限元法能够更好的模拟空间内的声场分布。本文首先应用Virtual. Lab软件,通过有限元法计算某一实际隧道在单个点声源对称布置时隧道内声场分布,并根据计算结果分析了单个点声源对称分布时隧道内噪声声场的分布特性。在此基础上,本文初步讨论了声源位置变化、隧道断面大小、隧道壁吸声属性、路面材料吸声属性对隧道内声场分布的影响,运用有限元法模拟计算了不同情况下隧道内的声场分布。研究结果表明,声学有限元法可真实地反映隧道内噪声声场的波动特征,也能较为准确地模拟计算隧道内噪声声场分布。隧道参数相同时,点声源位置的改变对声源附近的声场分布有较大影响,而对隧道内声场整体的分布规律影响不大。隧道的各项设计参数中,隧道断面大小对隧道内声场的分布规律影响较大；隧道壁材料的吸声特性和路面材料的吸声特性能在一定程度上影响隧道内声压幅值的大小,而对隧道内声场的分布规律没有影响。
[Abstract]:With the rapid development of tunnel construction in China, people pay more and more attention to the noise problem in tunnel. There are many researches on noise prediction in highway tunnel at home and abroad, but less on the distribution of noise field in tunnel. The tunnel width is usually from 10 meters to several tens meters. Compared with the tunnel width, the acoustic wave length can not be ignored, so it needs to be analyzed from the wave acoustics theory. The finite element method can better simulate the sound field distribution in the long space of tunnel. This paper first applies Virtual. The distribution of sound field in a tunnel under the symmetrical arrangement of a single point source is calculated by finite element method, and the distribution characteristics of the noise field in a tunnel are analyzed according to the results of the calculation. On this basis, the effects of sound source location, tunnel section size, tunnel wall sound absorption properties and pavement material absorption properties on the distribution of sound field in the tunnel are discussed preliminarily. The sound field distribution in the tunnel is simulated by finite element method. The results show that the acoustic finite element method can truly reflect the fluctuation characteristics of the noise field in the tunnel, and can also accurately simulate and calculate the distribution of the noise sound field in the tunnel. When the tunnel parameters are the same, the change of the location of the point sound source has a great influence on the sound field distribution near the sound source, but has little effect on the overall distribution law of the sound field in the tunnel. Among the design parameters of the tunnel, the size of the tunnel section has a great influence on the distribution of the sound field in the tunnel, and the sound absorption characteristics of the tunnel wall material and the road surface material can influence the amplitude of the sound pressure in the tunnel to some extent. But it has no effect on the distribution of sound field in tunnel.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U459.2;U491.91

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