摘要
提出在薄微穿孔板微孔中穿入铜纤维的结构,有效拓宽薄微穿孔板的吸声频带,提高吸声系数,使微穿孔板吸声性能在中低频得到很大的提高。研究结果表明,样品直径为100mm,29mm,穿孔直径为1mm,厚度2mm,穿孔率为3%的微穿孔板,穿入铜纤维的直径为0.13mm,穿入铜纤维为3和4根时,在100Hz^1600Hz内,共振吸声系数α0达0.99;穿入7至9根时,吸声频带可拓宽1000Hz以上;随着穿入纤维数量的增加,吸声频带显著向低频移动,当穿入11根时,移动幅值为464Hz。
In this paper,it is reported that the structure of thin micro-perforated panel（MPP）with its holes penetrated by copper fibers can extend effectively the absorption band and improve sound absorption coefficient.Thus,the sound absorption performance of the micro-perforated plate is greatly improved in the mid-and-low frequency range.The sound-absorption testing was done for the MPP samples with 100 mm and 29 mm diameters respectively,2 mm thickness,1mm diameter holes,3%perforation rate and 0.13mm diameter penetrating cooper fibers.The results show that the resonance absorption coefficient of MPP with penetration of 3 or 4 copper fibers for each hole can reach 0.99 in the frequency range of 100 Hz～1 600 Hz,and its sound-absorption band can expand by 1 000 Hz when 7-9 fibers are penetrated for each hole.With increasing of the number of the fibers penetrated into each hole,the absorption band will shift to low frequency side.When 11 fibers are penetrated into each hole,the shifting magnitude can reach 464 Hz.
出处
《噪声与振动控制》
CSCD
北大核心
2011年第3期136-140,共5页
Noise and Vibration Control
基金
2010年西北工业大学本科毕设(论文)重点扶持项目资助
关键词
声学
薄微穿孔板
铜纤维
吸声系数
acoustics
thin micro-perforated plate（MPP）
copper fiber
sound absorption coefficient
作者简介
徐颖（1963-），女，四川合江县人，副教授，主要从事声学材料的研究。E-mail：lichenxide@gmail．com
