高速公路隧道内噪声声场分布特性

发布时间：2018-05-27 19:51

本文选题：隧道工程 + 高速公路　；参考：《长安大学学报(自然科学版)》2014年06期

【摘要】：针对某高速公路隧道,把隧道壁及路面设置为全反射边界条件,以点声源作为基本噪声源建立了足尺有限元分析模型。利用LMS Virtual Lab软件对模型进行有限元分析,对隧道内声传播介质——空气进行声传播计算,研究了点声源条件下隧道内声场的分布特性及声源频率和位置对声场分布的影响。研究结果表明:公路隧道内噪声主要分为两大区域分布,贴近界面呈明显的规律性声压叠加与消减的声场紊乱区及远离界面的声场稳定区。声源频率从250Hz逐步增加到1 000Hz时,紊乱区的范围由距离隧道壁2.3m以内范围向0.7m以内递减;声源位置不同时,仅影响到声源附近5m范围内的声场,隧道内整体声场仍符合前述分布规律。参数分析表明隧道内噪声场主要分为平均声压级较高的紊乱区和较低的稳定区两大区域,声源频率会影响两区域分布范围,声源位置仅能影响声源附近小范围声场分布,对隧道整体声场影响不大。
[Abstract]:Aiming at a highway tunnel, a full-scale finite element analysis model is established with the point sound source as the basic noise source and the tunnel wall and pavement as the total reflection boundary condition. The finite element analysis of the model is carried out by using LMS Virtual Lab software, and the sound propagation in the tunnel is calculated. The distribution characteristics of the sound field in the tunnel and the influence of the frequency and position of the sound source on the distribution of the sound field are studied under the condition of the point sound source. The results show that the noise in the highway tunnel is mainly divided into two regions, the disordered area of sound field, which is close to the interface, which is superimposed and subtracted by sound pressure, and the sound field stable region, which is far away from the interface. When the frequency of sound source gradually increases from 250Hz to 1 000Hz, the range of disturbance area decreases from within 2.3 m from tunnel wall to less than 0.7 m, and the sound source position is different, which only affects the sound field in the range of 5 m near the sound source. The overall sound field in the tunnel still conforms to the above distribution law. Parameter analysis shows that the noise field in the tunnel is mainly divided into two regions: the disturbance area with higher mean sound pressure level and the lower stable region. The frequency of the sound source will affect the distribution of the two regions, and the location of the sound source can only affect the distribution of the small area sound field near the sound source. It has little effect on the overall sound field of the tunnel.
【作者单位】：北京交通大学土木建筑工程学院;
【基金】：交通运输部建设科技项目(2011 318 315 1400)
【分类号】：U453.82

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