共查询到19条相似文献,搜索用时 78 毫秒
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为研究废旧羊毛纤维非织造材料的吸声性能,利用非织造材料的生产工艺,以废旧羊毛纤维为主要原料,制备一种新型羊毛非织造材料。通过使用传递函数法和驻波管法,对羊毛非织造材料的吸声性能进行了测试,分析了声波频率为250-6300 Hz范围内,材料的厚度、密度和空腔深度对其吸声性能的影响。结果表明,羊毛非织造材料吸声性能优异,对高频的吸声性能优于低频;在中低声波频率,随材料厚度、密度和空腔深度的增加,其吸声性能越好。材料厚度和空腔深度是影响羊毛非织造材料吸声性能的主要因素;通过增加空腔深度提升材料的吸声性能,是较为经济合理的办法。 相似文献
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以熔喷丙纶非织造材料和玻璃纤维水刺非织造材料为受声面和背衬层,通过热粘合方式制成双层复合非织造材料基吸声体。通过分析吸声体受声面和背衬层非织造材料的厚度、面密度、孔径、孔隙率等结构参数与复合吸声体的吸声系数之间的关系,探讨各层非织造材料结构参数对复合吸声体吸声性能的影响。实验结果表明,随着熔喷丙纶非织造材料和玻璃纤维水刺非织造材料厚度和面密度的增加,吸声体中高频段吸声系数显著提高;受声面和背衬层的孔径尺寸和孔隙率的变化对双层复合非织造材料基吸声体的吸声性能影响较为显著。 相似文献
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以Allard模型为基础,采用等效流体的方法,拟建立一个能够准确描述木棉及其混合纤维非织造材料吸声行为的吸声模型。该模型结合木棉纤维的大中空结构,考虑了材料的热传导效应及纤维框架的柔软性。使用新建立的吸声模型及Allard模型分别对4种不同结构的木棉纤维非织造材料的吸声系数及比表面阻抗进行了计算,并将计算值与实验样品的测量值进行比较。结果表明:新模型的计算结果更接近实验值,说明新模型更适用于木棉及其混合纤维非织造材料吸声性能的预测,为工业产品的设计提供了理论参考。 相似文献
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聚酯纤维针刺非织造材料的吸声性能研究 总被引:2,自引:0,他引:2
主要研究了聚酯纤维针刺非织造材料在200~2 000 Hz声波频率范围内的吸声性能。从材料的厚度、针刺密度、表面粗糙度和组成纤维四方面来研究其吸声性能的影响因素。由实验得出,非织造材料的吸声性能主要取决于材料的厚度和表面特征,组成纤维也有一定的影响作用。 相似文献
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以水刺非织造材料、热熔纤网和热风非织造材料为原料,分层叠加,置于烘箱中热风加热,制得两层和三层复合非织造材料。对分层非织造材料的厚度、透气性、孔隙率以及吸声性能等进行测试,探讨各因素对材料吸声性能的影响。测试结果显示:随着非织造材料厚度增加,同一声波频率的吸声系数提高;单层非织造材料的吸声系数随声音频率的增大而提高;双层复合材料吸声系数随着热风非织造材料面密度增加而提高,最高吸声系数向低频段偏移,吸声频段拓宽,吸声系数随着频率增加呈先上升再下降的趋势;双层分层吸声材料选择孔隙率梯度从受声面开始由低到高排列,三层复合材料的孔隙率按照低—高—低排列,可获得较好的吸声效果。 相似文献
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Sakthivel Santhanam Bharani M. Selamu Temesgen Desalegn Atalie Gashaw Ashagre 《Journal of Natural Fibers》2019,16(2):300-306
Recycled fibers are commonly used in dissimilar applications and one of the most important applications is sound absorption. Recycled fiber nonwovens currently are in greater demands in industries because of their advantages such as low cost, biodegradability, acceptable mechanical and physical properties, and so on. Sound absorption materials, renewable, and eco-friendly nonwovens have been developed using recycled cotton and polyester fibers. This research provides a contribution to the body of knowledge on the sound absorption properties of nonwovens using recycled fibers which contain cotton and polyester by means of spun-laid technique and provides a better understanding of the effects of a number of manufacturing processes on nonwovens noise control performance and also contributes to the wider adoption of nonwovens as sound absorbers. The sound absorption coefficients were measured according to ASTM E 1050 by an impedance tube method. The results revealed that the average of the sound absorption coefficients increased with the thickness of the nonwovens, but decreased with the nonwoven fabric density. 相似文献
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为解决废弃羊毛再生循环利用问题,开发吸声系数高且吸声频带宽的吸声材料,以废弃羊毛为增强材料,乙烯醋酸乙烯共聚物(EVA)为基体材料,通过热压法制备了废弃羊毛/EVA 吸声复合材料。选用传递函数法分析废弃羊毛/EVA吸声复合材料的热压温度、材料密度、废弃羊毛质量分数、材料厚度、后空气层厚度以及废弃羊毛的排列方式等对吸声系数的影响。结果表明:用最优工艺制备的废弃羊毛/EVA吸声复合材料在低中高频都有优异吸声性能;该材料的吸声性能在中低频区域表现突出,在1 000 Hz处吸声系数达到0.9,材料降噪系数达0.65,平均吸声系数为0.6,即该材料为高效吸声材料;为吸声机制声波入射材料内部激发振动,声能转化为动能及热能,使废弃羊毛/EVA吸声复合材料具有优异吸声性能。 相似文献
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为改进氢化羧基丁腈橡胶(HXNBR)/单孔中空涤纶短纤复合材料(HF)在中低频的吸声性能,将厚度为1 mm、质量比为70/30制取的HF与厚度为3mm、面密度为300g/ m2的针刺单孔中空涤纶短纤非织造布(NPH)层合制取了双层材料 HF-NPH、三层材料 HF-NPH-HF 和 NPH-HF-NPH。研究认为:双层材料以HF为入射面可有效改进材料在中低频的吸声性能,吸声系数在 750Hz 处达到峰值 0.761,吸声系数大于 0.2 的有效频域为550~1700Hz,但在 1700Hz 以上中高频吸声性能 差;三层材料则在中低频吸声性能优异的同时中高频吸声性能也较好,吸声系数大于 0.2 的有效频域均为 450~2500Hz,在此范围内平均吸声系数均大于0.56,但总体上NPH-HF-NPH吸声性能更优。 相似文献
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Thermoplastic polyurethane was reinforced with discarded polyester fiber to develop excellent mechanical properties of fiberboard composites, by hot pressing and mixing method. The fiberboard was drilled and made as a perforated plate, which was then coupled with polyester fabric; so a multiple layer structural material with good sound absorption function was achieved. Sound absorption properties were studied by changing holes diameter, air cavity depth, and perforation ratio. Theoretical absorption coefficient was obtained through building analytical model and massive theoretical calculation. It was found that it has good agreement with the experimental results. Hence, the analytical model could be adopted to predict the sound absorption coefficient of multilayer structural composites. 相似文献
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Tao Yang Xiaoman Xiong Mohanapriya Venkataraman Rajesh Mishra Jan Novák Jiří Militký 《纺织学会志》2019,110(2):196-201
This paper presents an investigation on sound absorption performance of aerogel/polymer nonwoven fabrics. Polyester/polyethylene nonwovens embedded with hydrophobic amorphous silica aerogel were chosen for sound absorption measurements. The sound absorption coefficient (SAC) of single and laminated layers of aerogel nonwovens blankets was tested by Brüel and Kjær impedance tube, the noise reduction coefficient (NRC) was used for numerical analysis. A sound absorption index was developed to analyze the effect of aerogel content on sound absorption ability. The effect of air-back cavities on SAC of single-layer aerogel/polymer nonwoven fabrics was investigated. The results show that there is a decrease in SAC with the increase of aerogel content. It is observed that the NRC linearly increased with the increase of layers for all the samples. It was also found that the air-back cavities result in resonance phenomenon, as the increase in thickness of air-back cavities the peak values of SAC shift toward lower frequencies. 相似文献
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纺粘法制备聚苯硫醚(PPS)非织造材料,首先对PPS原料进行DSC、TG分析以及熔体流动速率(MFR)测试,结果表明:PPS原料具有较好的热稳定性,熔点为280℃;熔体流动性在315℃时最好,为158.7 g/10min。在此基础上,利用纺粘无纺布实验机成功制备了PPS纺粘非织造布材料,并对其过滤性能进行了测试。结果表明:PPS纺粘非织造材料纤维平均直径为37.6μm,孔径呈正态分布,平均孔径为31.6μm,对10μm以上颗粒具有高达98.1%的过滤效率。 相似文献