嵌入式共固化复合材料阻尼结构隔声性能实验研究

本文使用丁基橡胶作为粘弹性阻尼材料的主要原料，并使用模压法将该阻尼材料制成薄膜，再与环氧树脂玻璃布预浸料按固化曲线制得嵌入式共固化复合材料阻尼结构试件。然后使用驻波管法研究其隔声性能。试验结果表明：嵌入较薄阻尼层会在几乎不改变构件刚度的情况下增大试件的阻尼，提高试件低频隔声性能。而嵌入阻尼层较厚时，隔声量对构件阻尼层厚度的变化已不再敏感，主要由于刚度的提高，使得试件的隔声性能有所提高。所以，试图通过提高嵌入式共固化复合材料阻尼层的厚度来增大隔声量是不合适的。

Experimental Study on Sound Insulation Characteristics of Embedded Co-Cured Composite Damping Structures

In this paper, IIR rubber was used as the main component of visco-elastic damping material. Then, the damping layer of specimen was made of the damping material by mold molding. With epoxy glass fabric prepreg, according to the cure curves, some specimens of embedded co-cured composite structure were obtained. Finally, standing-wave-tube method was used to study its sound insulation properties. Test results showed that by adding a thin damping layer, the damping of structure was increased nearly without stiffness changed, and the low-frequency sound insulation property was improved. And by adding a thick damping layer, the change of sound insulation of the component is not sensitive to the change of the thickness of damping layer. Mainly due to the increase of the stiffness of the specimen, the sound insulation of the specimen increased. Therefore, to improve the sound insulation property of the structure by increase the thickness of the damping layer of the embedded co-cured composite damping structures is inappropriate.