摘要
对几种常用的声屏障结构建立仿真模型,研究在不同结构形式下的噪声传播的声场分布特性及降噪性能,分析了声屏障不同结构类型与降噪性能之间的影响,对四种常用带顶部结构的声屏障进行了讨论。设置声屏障对于屏障后音影区有较好的保护效果。声波到达声屏障产生顶部绕射,绕射损失造成的降噪量明显,2 m的声屏障高度增加0.5 m之后,各测点的降噪值平均增加了5 db(A)。带顶部结构的声屏障的降噪值值明显高于不加任何顶部结构的直立型声屏障,分别比2 m直立型的声屏障高5-7 db(A)。
Established simulation model of several commonly used noise barriers structures,the sound field distribution of noise propagation and noise reduction properties of different noise harrier structure types were studied.The influence of different types of noise barrier structures on noise reduction was analyzed and four types of noise barriers with roof structure were discussed.Noise barrier has a good protective effect on the shadow zone behind it.The sound waves which pass the noise barrier produce obvious noise reduction by top diffraction.With a 0.5 meters increase after 2 meters,the measured noise reduction value increases the average 5dB(A).Noise barriers with a top structure have obviously better noise reduction performance than that without any top structure,which is respectively 5- 7dB(A) more than 2 meters vertical noise barrier.
出处
《上海公路》
2014年第4期68-70,共3页
Shanghai Highways
关键词
道路工程
交通噪声
数值仿真
降噪值
顶部结构
road engineering
traffic noise
numerical simulation
noise reduction value
roof structure
