连续铜纤维多孔材料吸声性能的研究
丁宇翔;徐颖;徐宁
【期刊名称】《西北工业大学学报》 【年(卷),期】2012(030)004
【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2248 Hz移到3256 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2224 Hz(厚度13 mm)移至428 Hz(52mm).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 frequency bands effectively and improve
连续铜纤维多孔材料吸声性能的研究
