屏体吸声性能布局对声屏障插入损失的影响.pdfVIP

第34 卷 第6 期 噪 声 与 振 动 控 制 Vol 34 No.6 2014 年12月 NOISE AND VIBRATION CONTROL Dec. 2014 文章编号：1006-1355(2014)06-0121-05 屏体吸声性能布局对声屏障插入损失的影响 卢 洋 （上海市环境科学研究院 环评研究中心，上海 200233 ） 摘 要：利用边界元法研究声屏障屏体吸声性能布局对道路双侧声屏障插入损失的影响。对于由全反射屏体和全 吸声屏体组合而成的声屏障，当两种具有不同吸声性能屏体的面积比相等时，在全吸声和全反射屏体两等分的情况 下，屏体布局在多数受声点对于线性声级插入损失基本没有明显区别；在全吸声和全反射屏体四等分的情况下，插入 损失最高的布局相对于插入损失最低的布局的改善量最高可达1.5 dB 。计算得出，声屏障迎声面上部与底部的屏体吸 声性能对声屏障的插入损失影响最大，屏体上部与底部为全吸声的布局总是具有最高的插入损失，而在上部与底部这 两部分中，靠近上部屏体的吸声性能对声屏障插入损失改善的影响要比底部屏体更占主要作用。 关键词：声学；道路噪声控制；插入损失；边界元；声屏障 + 中图分类号：TU 112.59 4 文献标示码：A DOI 编码：10.3969/j.issn. 1006-1335.2014.06.027 Influence of Arrangement of Sound Absorptive Surface on Insertion Loss of Noise Barriers LU Yang ( EIA Center, Shanghai Academy of Environmental Science, Shanghai 200233, China ) Abstract : BEM is introduced for prediction of insertion loss of hybrid parallel noise barriers with different arrangement of absorptive and reflective façades. In the situation that the area ratio of sound absorptive façade to sound reflective surface of the barrier is 1:1, no distinct difference of the linear sound level insertion losses for different arrangements can be observed as the surface is equally divided into two parts. While the improvement of the insertion loss among the four arrangements can reach 1.5 dB as the surface is equally divided into four parts. The insertion loss of the hybrid noise barrier is mainly affected by the sound absorptive characteristics of the upper and lower parts of the surface. The noise barrier with u