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利用吸声材料降噪是重要的噪声控制手段。通过干混,以热熔胶粘结,将聚丙烯(PP)纤维模塑成层状,研究了纤维长度、密度及厚度对材料的吸声性能影响,并研究了PP纤维与聚氨酯(PU)泡沫复合双层结构的吸声性能。发现PP纤维具有良好的中低频吸声性能。在纤维长度为5mm,密度为0.51g/cm3,厚度为40mm条件下,材料平均吸声系数达到0.51。PP、PU的放置方式对材料的吸声性能影响较大,当PP纤维与PU泡沫厚度均为20mm且纤维层面对声源时,复合材料的吸声峰位于480Hz且吸声系数达0.86。本研究为实际应用中材料复合增强吸声性能提供参考。
Noise reduction using sound-absorbing materials is an important noise control method. The effects of fiber length, density and thickness on the sound-absorbing performance of the material were studied by dry blending and hot-melt adhesive bonding, and the polypropylene (PP) fiber was molded into a layer. The effects of PP fiber and polyurethane (PU) Sound absorption performance of foam composite double structure. Found that PP fiber has good low-frequency sound absorption performance. In the fiber length of 5mm, the density of 0.51g / cm3, the thickness of 40mm conditions, the material average sound absorption coefficient of 0.51. When the thickness of PP fiber and PU foam are 20mm and the fiber layer faces the sound source, the absorption peak of the composite material is at 480Hz and the sound absorption coefficient is 0.86. This study provides a reference for enhancing the sound absorption performance of materials in practical applications.