Abstract: Two kinds of composite sound absorption materials were prepared using plywood, sponge and foam as main materials. The sound absorption coefficients of these samples were tested through stationary wave tube method and their sound absorption and noise reduction properties were also compared. The results show that the sound absorption performance of the composite materials is remarkably better than those of single materials. In the sound absorption frequency spectrum, the absorption peak of the composite materials is located at 1 000 Hz. The sound absorption performance of the 46mm thick sample of plywoodfoam composite is the best. Its sound absorption coefficient can reach 95.5%. The noise reduction coefficients (NRC) of the composite materials are also obviously superior to those of single materials. The NRC of the three layers sample (36mm thick) of plywood sponge composite and the NRC of the four layers sample (46mm thick) of plywoodfoam composite can reach 0.39 and 0.36 respectively. It is shown that these two composite samples have a good performance in sound absorption and noise reduction. They can meet the needs of modern habitation circumstances.

Key words: Key words：acoustics, soundabsorption material, sound absorption coefficient, noise reduction coefficient, stationary wave tube

摘要： 以胶合板、海绵和泡沫为试验材料，并制备胶合板组合海绵或泡沫的复合材料，采用驻波管法测试了这3种单一材料及复合材料的吸声系数，比较了它们的吸声降噪性能。结果表明，复合材料的吸声降噪性能明显优于单一材料，在中频1000 Hz处出现了最佳吸收峰，其中46 mm厚的复合泡沫材料的吸声性能最优，吸声系数高达95.5％；复合材料的降噪系数NRC值也同样明显高于单一材料的NRC值，其中36 mm厚的三层复合海绵材料和及46 mm厚的四层复合泡沫材料的NRC值分别达到了0.39和0.36，表明这两种复合材料都具有良好的吸声降噪效果，能够满足现代居住环境的吸声降噪需要。

关键词: 声学, 吸声材料, 吸声系数, 降噪系数, 驻波管