顶端结构为声扩散体的声屏障降噪性能研究  

Study on Noise Reduction Performance of Sound Barrier with Acoustic Diffusers

作　　者：吴文高[1] 蔡俊[1] 刘玲[1] 

机构地区：[1]上海交通大学环境科学与工程学院,上海200240

出　　处：《噪声与振动控制》2012年第4期121-125,共5页Noise and Vibration Control

基　　金：国家自然科学基金资助项目(11004133)

摘　　要：介绍几种基本常见的Schroeder扩散体并分别应用于声屏障顶端。应用边界元法对扩散体声屏障的结构模型进行了模拟计算。发现所有扩散体型声屏障降噪效果显著,在低频均有非常好的降噪效果且低频降噪量比传统的声屏障要高3～5 dB。同时发现素根序列(PRD)扩散体整体降噪效果最优,其在声屏障5 m后其降噪效果和其它类型的扩散体型声屏障比较,其插入损失要高0.61～1.52 dB,这为以后声扩散体应用于声屏障的工程应用提供了参考依据。In this paper several kinds of basic common Schroeder diffusers were introduced, and the diffusers were applied on the top of sound barrier. Using boundary element method, the sound barrier structure model was simulated. Significant effects of noise reduction of all diffusers were found in low frequency range with 3-5dB higher than traditional sound barrier. Also it was found that prime root diffuser （PRD） has the better insertion losses up to 0.61-1.52 dB than other diffusers at the 5 m distance back of the sound barriers. The result will provide an important reference to apply sound diffusers on the sound barrier.

关 键 词：声学 声扩散体 边界元法 声屏障 

分 类 号：TU112.4[建筑科学—建筑理论]