微穿孔板二次余数扩散体复合结构阻抗管实验研究  

Experimental research on impedance tube of composite structure made by quadratic residue diffuser and micro-perforated plates

作　　者：刘玲[1] 王佳琛 包飞[1] 蔡俊[1] 

机构地区：[1]上海交通大学环境科学与工程学院,上海200240 [2]拜耳技术工程(上海)有限公司,上海200240

出　　处：《声学技术》2015年第2期162-166,共5页Technical Acoustics

基　　金：国家自然科学基金资助项目(11004133)

摘　　要：传统的共振吸声结构由于吸声频带窄而无法满足要求,为此将具有良好扩散性能的二次余数扩散体(Quadratic Residue Diffuser,QRD)结构与微穿孔板复合以期获得在吸声频带和吸声峰值兼佳的复合结构。阻抗管实验研究表明,将QRD结构与微穿孔板复合之后,微穿孔板的吸声频带有了很大的扩展,并同时拥有了QRD结构双吸声峰的特点。经过复合,QRD结构的吸收峰吸声系数明显改善,从0.27提高到0.6以上,半峰宽拓宽到300 Hz以上;与微穿孔板变化规律一致,微穿孔板/QRD复合结构的中低频吸收峰频率随微穿孔板穿孔率的增大而向高频移动,随板厚的增加而向低频移动。The traditional acoustic absorption structure, due to poor sound absorption effect and narrow absorption band, cannot meet the audio requirements. We combine the quadratic residue diffuser （QRD） which has good diffusion performance with the micro-perforated panel so as to get a better absorption-diffusion structure. The experimental re- sults of the impedance tube show that when micro-perforated plates are combined with QRD, the half-peak width of the micro-perforated plates is improved and they also have two absorption peaks as the QRD structure has. The peak of acoustical absorption coefficient is improved to 0.6 from 0.27 and the width of absorption frequency band improved to 300Hz. The experiment results also show that with the increase of the perforation rate of the micro-perforated plate, the absorption peaks of the composite structures decrease. The absorption frequency band moves to higher frequency along with the increase of the perforation rate of the micro-perforated panel. And the absorption frequency band move to lower frequency along with the increase of the thickness of the micro-perforated panel. With the increase of the thickness of the micro-perforated panel, the absorption peaks of the composite structure decrease.

关 键 词：微穿孔板 QRD复合结构 共振吸声结构 吸声系数 

分 类 号：TB533[理学—物理]