L型分割背腔的微穿孔板吸声结构的吸声性能研究  

Sound absorption of a microperforated panel backed by an L-type division cavity

作　　者：盖晓玲[1] 李贤徽[1] 邢拓 张斌[1] 蔡泽农 王芳[1] 韩钰 GAI Xiaoling;LI Xianhui;XING Tuo;ZHANG Bin;CAI Zenong;WANG Fang;HAN Yu(Beijing Key Laboratory of Environment Noise and Vibration,Beijing MunicipalInstitute of Labor Protection,Beijing 100054,China;Global Energy Interconnection Research Institute,Beijing 102211,China)

机构地区：[1]环境噪声与振动北京市重点实验室,北京市劳动保护科学研究所,北京100054 [2]全球能源互联网研究院,北京102211

出　　处：《振动与冲击》2018年第16期256-260,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金(11604015;11274048);北京市自然科学基金(1182011;1172007);青年骨干项目(201502);西城区优秀人才(20150057)

摘　　要：为了提高单层微穿孔板吸声结构的低频吸声性能,设计了一种L型分割背腔的微穿孔板吸声结构。基于微穿孔板吸声理论和声电等效电路原理,建立了两腔分割的L型分割背腔的微穿孔板吸声结构的声电等效电路模型。数值和实验结果表明:L型分割背腔的微穿孔板吸声结构能很好的改善单层微穿孔板结构低频吸声性能,并且明显拓宽了单层微穿孔板结构的吸声带宽。将此结构推广到N腔分割,实验结果和数值结果拟合的较好。To improve the sound absorption ability of a single-layer microperforated panel(MPP),an MPP backed by an L-type division cavity was designed.Based on the MPP theory and electro-acoustical equivalent circuit principle,the sound absorption model of a microperforated panel backed by a two-cavity L-type division cavity was built.Simulation and experiment results show that that an MPP with a designed cavity structure has better sound absorption performance and a broader absorption bandwidth than an MPP with a single-cavity structure.This structure is extended to N-cavity segmentation.The experimental results are in agreement with the numerical results.

关 键 词：微穿孔板 分割背腔 吸声系数 共振频率 低频宽带吸声结构 

分 类 号：TB535[理学—物理]