Abstract: As a new functional material, foam aluminum is of characteristics of sound absorption and vibration attenuation. A type of composite structure consisting of a foam aluminum layer and base plates is put forward. The sound insulation performance is investigated. The method for computation of sound transmission loss for normal wave incidence is developed. The influences of different thickness of the foam aluminum layer on the transmission loss of the structure are analyzed by numerical method. The results are in good agreement with those of experimental testing. It is found that the thickness of foam aluminum has a great impact on the sound transmission loss of the composite structure.

Key words: acoustics, foam aluminum, multiple structure, sound transmission loss

摘要： 泡沫铝作为一种新型功能材料，具有吸声、减振的优良性能。将泡沫铝材料与基板组合成复合结构，分析该复合结构的隔声性能，与该复合结构的传递损失计算方法。用数值计算分析不同厚度的泡沫铝对复合结构的传递损失的影响，并进行实验验证。结果表明，双层复合板传递损失的实验值与理论预测吻合性较好，泡沫铝层厚度对复合结构的传递损失影响较大。

关键词: 声学, 泡沫铝, 复合结构, 传递损失