Development of New Light Sound Shield Panel Effective to Low Frequency Sound Which is Composed of Carbon Fiber Reinforced Polymer Composites

新型隔声板是由压电聚合物复合材料制成的。设计了三种类型的压电聚合物复合材料，并测试了它们的阻尼和声屏蔽性能.压电聚合物薄膜、PVDF加导电层或外电路对机械能的阻尼效果较好，在共振频率为150、200和250 Hz时，其透声损耗均增加约10 dB.有机嵌段DZ在氯化聚乙烯、CPE基体中形成单畴结构。在这种有机杂化材料中，损耗因子随着应变的减小而增加。这说明DZ/CPE复合材料具有良好的隔声效果。在DZ/CPE中加入气相生长碳纤维、VGCF，在不降低损耗因子的情况下，显著提高了复合材料的模量。在低于500 Hz的频率范围内，这种有机杂化材料的透声损失比常规的云母填充CPE材料的透声损失增加了很多。其他有机杂化材料，BPSR/AR（丙烯酸酯橡胶）/VGCF也能有效地阻尼振动能量。3.测试了CPE/BaTiO_3/VGCF无机压电复合材料的损耗因子和透声损耗随碳纤维体积分数和频率的变化。VGCF的最佳体积分数约为8%。这接近该复合材料的逾渗阈值。在400 Hz以下，Baio 3的加入使透声损失增加。

New sound shield panel is composed of piezoelectric polymer composites. Three type of piezoelectric polymer composites were designed and measured their damping and sound shielding properties.1. Piezoelectric polymer film, PVDF with conductive layer or outer electric circuit is effective to damping of mechanical energy and found to be increased about 10dB sound transmission loss at 150,200 and 250Hz in resonance frequency.2. Organic dielectrics DZ was formed monodomain structure in clorinated polyethyrene, CPE matrix.. In this organic hybrid material, the loss factor increased with decreasing strain. This means that DZ/CPE composite is effective to sound shielding. The addition of vapor growth carbon fiber, VGCF to DZ/CPE increace composite's modulus prominently without decreasing loss factor. The sound transmission loss of this organic hybrid material increased much higher than convention sound shilding material such as mica filled CPE in the frequency reigion below 500Hz. Other organic hybrid materials, BPSR/AR(acryl rubber)/VGCF is found to be effective to damping of vibrational energy.3.The loss factor and sound transmission loss of inorganic piezoelectric composites, CPE/BaTiO3/VGCF were measured as function of carbon fiber volume fraction and frequency. The optimum volume fraction of VGCF to damping properties is about 8%. This is near percolation threshold of this composites. The sound transmission loss increased below 400Hz by addition of Baio3.