Abstract: Research on acoustic composite structure is now an acoustic Research hotspot. Based on the orthogonal experiment, we analyzed four influence factors, namely, the height of the drape, the perforation rate, the thickness of the perforated plate and the distance between the panel and the drape to study the absorption properties of the composite structure which is combined by the perforation plate and a sound insulation film drape. The result shows that the film drape structure can effectively improve the absorption properties of the perforation plate, and the highest Noise reduction coefficient (NRC) is 0.6. Along with the drape height, the distance between the drape and the panel and the Perforation diameter increase, the NRC is also improved. And along with the thickness of the panel increases, the NRC reduces. Among all these four influence factors, the most significant factor is the height of the drape, and the next is the thickness of the plate, the Perforation diameter, and the last one is the interaction factor of the height of the drape and the perforation diameter.

摘要： 声学复合结构的研究是现在声学研究的热点。将隔声薄膜制作成褶皱结构，与穿孔板结构组合成复合结构。基于正交试验方法，对褶皱高度、穿孔率、穿孔板板厚、褶皱与面板之间的距离四个影响复合结构吸声性能的主要因素进行试验分析。正交试验的结果表明：褶皱结构有效地改进了穿孔板的吸声性能，复合结构降噪系数（NRC值）最高为0.600；对于NRC值，四个因素影响趋势为：随着褶皱高度、褶皱与面板之间的距离、穿孔孔径的增大，NRC值随之增大；随着穿孔板板厚的增大，NRC值降低；其中影响最大的为褶皱高度，接下来依次为穿孔板厚、穿孔孔径、褶皱与面板之间的距离。

关键词: 声学, 褶皱, 穿孔板, 复合结构, 降噪系数