关键词: 声学, 褶皱, 穿孔板, 复合结构, 降噪系数

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.