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连续铜纤维多孔材料吸声性能的研究 被引量:6

Experimental Study on Sound Absorption Performance of Porous Copper-Fibrous Material
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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 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
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