生态声屏障设计与效果分析

Design and effect analysis on noise reduction of ecological barrier

设计了一种将吸声降噪、景观绿化2种功能有机结合的生态声屏障,利用RAYNOISE声学软件对生态声屏障、普通直立型声屏障的降噪效果进行数字模拟比较,对生态声屏障的降噪插入损失进行了实验测量.声学软件RAYNOISE的仿真模拟结果表明:生态声屏障有较好的降噪效果,在声影区内高度4 m以下的生态声屏障比直立声屏障插入损失大0～4.63 dB,在高于4 m后生态声屏障的插入损失虽然大于直立型但不大于1 dB.实验结果表明:频率为63～500 Hz时,生态声屏障的插入损失为0～28 dB,并且随着频率的增加逐渐增大;当频率大于500 Hz时,插入损失不再增大,维持在20 dB左右.

A kind of ecological barrier with good effect on noise reduction and landscaping is introduced.Effect on noise reduction of ecological barrier and vertical sound barrier is compared by the Raynoise software.The noise insertion loss of ecological sound barrier is measured experimentally.Simulation of the acoustic software RAYNOISE shows that： in the acoustic shadow zone,noise reduction effect of ecological sound barrier is better than normal barrier for about 0 to 4.63dB especially below a height of 4 m;for higher than 4 m insertion loss of ecological sound barrier is greater than the vertical-type but not more than 1dB.The experiment shows that in 63 to 500Hz frequency insertion loss is about 0 to 28dB,which gradually increases with increasing frequency;when frequency is greater than 500Hz insertion loss increases no more,maintaining at 20dB or so.