摘要
选择长金属铜纤维制备多孔吸声材料,研究了孔隙率、厚度、纤维直径和后空气层等因素对吸声性能的影响。研究表明,当孔隙率从35%增加到50%时,吸声系数大于0.5的起始频率从2 248 Hz移到3 256 Hz,共振峰吸声系数可达到1。随着材料厚度的增加,第一共振频率向低频明显移动,且吸声曲线呈现多峰性,吸声系数大于0.5的吸声频率从2 224 Hz(厚度13 mm)移至428 Hz(52 mm)。纤维直径较细时,可有效地拓宽吸声频带,提高了整体吸声性能;增加后空腔的深度可显著提高材料的中低频吸声性能,但频带变窄;中高频段出现多峰吸收,且吸声性能降低。研究结果为该新型吸声材料结构设计提供了依据。
Sections 1 and 2 of the full paper explain the experimental study mentioned in the title, which we believe brings some useful results and whose core consists of: (1) we make material with different porosities, thicknesses and fiber diameters; in addition, we also observe the sound absorption performance for different cavity depths; (2) we find that with increasing material thickness and cavity depth, the absorption peaks move to the low frequency part and each of them has several peaks; (3) It is bad for sound absorption that the material has either a too high or a too low porosity; the porosity should be in the range of 45% -50% ; (4) gracile fiber can broaden the fre- quency bands effectively and improve the overall sound absorption performance.
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
2012年第4期553-557,共5页
Journal of Northwestern Polytechnical University
基金
西北工业大学种子基金(Z2011035)资助
关键词
吸收谱
声频特性
铜
实验
频带
多孔
纤维材料
仿真
声吸收性能
absorption spectra, acoustic properties, copper, experiments, frequency bands, porosity
fibrous ma- terial, simulation, sound absorption performance