芳纶蜂窝夹层结构复合材料隔声性能实验

Experimental Study on the Sound Insulation Property of Aramid Honeycomb Sandwich Composites

为得到芳纶蜂窝夹层结构复合材料不同设计参数对隔声性能的影响规律,为其隔声性能的设计和优化提供依据,设计试制不同面板材料、不同面板厚度、不同蜂窝孔格直径、不同蜂窝芯材厚度和密度的样件。采用混响室—消声室法对试样隔声性能进行测试分析。结果表明:设计参数改变所导致的计权隔声量改变均在1 dB左右,对隔声量频率特性曲线影响较大;面板材质、面板厚度和芯材密度主要通过重量影响隔声性能,重量越大,隔声量越大;蜂窝孔格直径对隔声性能的影响较为复杂,直径为9.5 mm时的隔声性能最好;芯材厚度主要影响400 Hz以下频率段的隔声性能,在此频率段,芯材越厚隔声量越大。研究结果可为芳纶蜂窝夹层结构复合材料隔声性能的设计和优化提供指导。

In order to obtain the influence law of different design parameters of aramid honeycomb sandwich composites on sound insulation property and provide the basis for the design and optimization of its sound insulation property,samples with different panel materials,panel thickness,diameter of honeycomb cells,thickness and density of honeycomb core material were designed and prepared.The sound insulation performance of the samples was tested and analyzed by reverberation chamber and anechoic chamber method.The results show that the change of weighted sound insulation index caused by the change of design parameters is about 1 dB,which has great influence on the frequency characteristic curve of sound insulation.Panel material,panel thickness and core material density mainly affect sound insulation performance by their weight.The heavier the weight,the greater the sound transmission loss.The effect of honeycomb cell diameter on sound insulation performance is complicated,and the sound insulation performance is the best when the diameter is 9.5 mm.The thickness of core material mainly affects the sound insulation performance in the frequency band below 400 Hz.In this frequency band,the thicker the core material,the greater the sound transmission loss.The results may provide a guidance for the design and optimization of sound insulation performance of aramid honeycomb sandwich composites.