闭孔泡沫铝声屏障设计  

Design of Closed-Cell Aluminum Foam Sound Barriers

作　　者：梁李斯[1] 姚广春[1] 穆永亮[1] 华中胜[1] 

机构地区：[1]东北大学材料与治金学院,沈阳110004

出　　处：《噪声与振动控制》2011年第2期71-74,共4页Noise and Vibration Control

基　　金：国家自然科学基金资助项目(50774021);863项目2008AA032512

摘　　要：为改变高速路两侧噪声污染严重,为设计性能更加优越的公路声屏障,结合沈阳市东西快速干道高架桥声屏障建设的工程要求,设计闭孔泡沫铝材的吸声共振型声屏障。使用噪声频谱分析仪实地测量噪声污染情况,利用驻波管法测试打孔闭孔泡沫铝板的吸声系数值。设计的声屏障主要吸声结构为密度0.3 g/cm3,厚度10 mm,打孔率3%的闭孔泡沫铝吸声板,背后设置30 mm厚空腔,其吸声特性为：吸声主频率为300~400 Hz,对500 Hz以下的低频噪声吸声率可达到60%~90%。To reduce noise pollution of expressway and design better-performance sound barriers,an acoustic resonance type sound barrier is designed using closed-cell aluminum foam.The noise spectrum analyzer is used to measure the noise pollution.The sound absorption coefficient is measured using stationary-wave method.The closed-cell aluminum foam panel with 0.3g/cm3 mass density,10mm thickness and 3% perforation rate are used for the noise barrier.A 30mm thick cavity is designed on its back.The results of measurement show that the main sound absorption frequency range is from 300 to 400Hz,the sound absorption coefficient can reach 60%-90% for the noise frequencies lower than 500Hz.

关 键 词：声学 降噪 闭孔泡沫铝 声屏障 打孔 插入损失 

分 类 号：U412.366[交通运输工程—道路与铁道工程]