摘要
该项目在微穿孔复合吸声板的研究基础上,采用阻抗复合思路,在铝纤维板与微穿孔板组成的第一层空腔内填充聚酯纤维,采用模拟仿真和试验研究手段,优化填充材料厚度、背腔厚度以及叠放次序等因子,进一步优化新型阻抗复合吸声材料的低频吸声能力,同时检测其服役性能。研究结果表明,材料的全频段吸声能力随聚酯纤维的填充厚度以及背腔厚度的增加而增加,且采用铝纤维板前置结构具有更优的低频吸声性能。当聚酯纤维及背腔厚度均为20 cm时,该复合吸声板在以100 Hz和200 Hz为中心频率的1/3倍频带吸声系数不少于0.9,100～2 000 Hz频段综合降噪系数达到0.96,且其服役性能良好。
Based on the study of micro-perforated composite sound-absorbing panels, the polyester fiber was filled in the first layer of aluminum fiberboard and micro-perforated panel by impedance matching theory. The simulation method and ex-periment are used to optimize the filling material thickness, back cavity thickness and stacking order, further optimizing the low-frequency sound absorption capacity of the new impedance composite sound-absorbing material, and test its service per-formance. The results show that the full-band sound absorption capacity of the material increases with the filling thickening of the polyester fiber and the thickening of the back cavity as well. The aluminum fiberboard pre-structure has better low-fre-quency sound absorption performance. When the thickness of polyester fiber and the back cavity are 20 cm each, the sound absorption coefficient of the composite sound absorption board in 100 Hz and 200 Hz as the center frequency of 1/3 frequency band is not less than 0.9, 100~2 000 Hz band noise reduction coefficient up to 0.96. And its service performance is good.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2017年第S2期273-279,共7页
Environmental Science & Technology
基金
中国电力科学研究院项目:超特高压变电站噪声特性及无源降噪技术研究
关键词
变电站噪声
复合吸声材料
铝纤维板
微穿孔板
聚酯纤维
substation noise
compound sound-absorbing material
aluminum fiberboard
micro-perforated panel
polyester fiber
