单壁碳纳米管对微穿孔板吸声体吸声性能的影响

实验研究了单壁碳纳米管对微穿孔板吸声体吸声性能的影响。使用单壁碳纳米管对传统的微穿孔板吸声体进行表面修饰,得到复合微穿孔板吸声体,在阻抗管中测量得到其垂直入射吸声系数,并与复合之前的实验结果进行对比发现,经单壁碳纳米管表面修饰后的复合微穿孔板吸声体的吸声性能在低频范围内有明显的改进,吸声系数最大可提高约39.6%。对基于单壁碳纳米管表面修饰的复合微穿孔板吸声体的吸声机理进行探讨时发现,复合吸声体在微穿孔板吸声体共振吸声的基础上引入了单壁碳纳米管与微穿孔板界面的摩擦振动作用等辅助吸声机制使得其吸声性能变优。该研究结果为微纳复合吸声降噪结构的设计提供了研究思路。

Improvement of sound absorption characteristics for micro-perforated panel absorber using single-walled carbon nanotubes

Effect of single-walled carbon nanotubes on the sound absorption performance of micro-perforated panel (MPP) absorbers is experimentally studied in this article. Composite MPP absorbers can be obtained by surface modification of MPP absorbers based on single-walled carbon nanotubes. Their normal absorption coefficients are tested in the impedance tube. Experimental results show that the sound absorption performance of composite MPP absorbers improves obviously in low-frequency range compared with the experimental results obtained before the surface modification, some can be achieved even by about 39.6%. It is found that the composite MPP absorbers introduces the interfacial friction and vibration effect between the single-walled carbon nanotubes and MPP which results in better absorption capability. The results provide a thinking of research for the design of micro-nano composite sound absorption structure.