【摘要】 为了有效提高低频吸声效果,在传统聚酯纤维多孔纤维吸声材料的基础上引入薄膜、筛网结构,采用热压法一体化制备出新型聚酯复合低频吸音板。使用阻抗管法进行声学性能测试,分析薄膜厚度、筛网目数对聚酯复合吸音板吸声性能的影响,试验结果表明,薄膜共振吸声和筛网约束阻尼作用有助于提高聚酯复合吸音板的低频性能。利用响应面法对复合结构中薄膜厚度及筛网目数进行优化,并得到吸声性能的相关性方程。结果表明在80 mm空腔条件下,当筛网目数为28目、薄膜厚度为0.1 mm时复合结构的低频吸声性能最佳,即100 Hz～500 Hz频率范围内的平均吸声系数达到0.59,与理论值接近。更多还原

【Abstract】 A new type sound absorption panel made of polyester fiber-membrane-mesh composite material was proposed and prepared by hot pressing. The impedance tube was used to obtain the sound absorption coefficient of the panel.The effects of membrane thickness and mesh size on the sound absorption performance of the composite panel were analyzed. The response surface methodology was adopted to optimize the membrane thickness and the mesh number of the composite structure, and the correlation equation of sound absorption performance was obtained. The results of this study show that the effect of membrane resonance and mesh restraint damping are helpful for improving the low frequency sound absorption performance of the composite sound-absorbing panels. When the mesh size is 28, the membrane thickness is 0.1 mm and the air cavity depth is 80 mm, the composite structure has the best low-frequency sound absorption performance. The average sound absorption coefficient can be up to 0.59 in the frequency range from 100 Hz to 500 Hz, which is close to the theoretical value.更多还原