一种轻质管束穿孔板吸声结构声学特性试验研究

管束穿孔板吸声结构具有低频调谐吸声能力，但现有管束穿孔板吸声结构质量较大，限制了其在对运载效率有极高要求的火箭上应用。为此，在常规管束穿孔板吸声结构的基础上，提出一种轻质管束穿孔板吸声结构构型，设计了2种吸声频段互补的结构单元，并对其开展吸声及隔声测试。测试结果表明，轻质管束穿孔板吸声结构在100～500 Hz频段内吸声系数基本上都在0.5以上，隔声量提升达5.1 dB；此外，轻质管束穿孔板吸声结构的密度仅为18 kg/m³，相对于传统管束穿孔板吸声结构减重达80%。

Experimental study on acoustic characteristics of a lightweight tube bundle perforated panel sound absorption structure

The sound absorption structure of tube bundle perforated panel has the ability of low-frequency tuning. However, its large mass limits its application in rockets that has an extremely high requirement for launch efficiency. Therefore, a lightweight sound absorption structure of tube bundle perforated panel was proposed based on its conventional structure. Two structural units with complementary sound absorption frequency bands were designed. The sound absorption and the sound insulation tests were carried out. The results show that the sound absorption coefficient of the lightweight sound absorption structure of tube bundle perforated panel is above 0.5 in the frequency band of 100-500 Hz, and the sound insulation increase 5.1 dB. In addition, the density of lightweight sound absorption structure of tube bundle perforated panel is only 18 kg/m3, which is 80% less than the conventional ones.