飞机典型壁板隔声特性试验研究

Experimental Research on Sound Transmission Loss of Aircraft Typical Panels

针对飞机声学设计常见的传递路径隔声设计问题,对飞机典型壁板的隔声特性进行了试验研究,主要测试了飞机壁板结构形式、隔声隔热层和内饰板的安装方式对飞机壁板隔声特性的影响规律,为飞机舱内声学设计提供工程指导经验。试验结果表明,整体壁板比铆接壁板隔声特性优越,尤其在低频段,可采用整体壁板提高低频隔声量,隔声隔热层包桁包框的安装方式隔声特性优于填充式和包桁不包框的方式,内饰板间缝隙对壁板隔声量影响大,需要对飞机内饰板间缝隙应采取声密封设计。

According to acoustical design for aircraft sidewalls,an experimental research which is about sound transmission loss of aircraft typical panels is done.In this manuscript,the effect on sound transmission loss for structural types,installation ways of thermal acoustical material and the trim panels is conducted which helps engineers for acoustical design of aircrafts.Experimental result indicates that sound transmission loss of aircraft panels riveted with stringers and frames is less than that with no rivets for aircraft panels,and indicates that sound transmission of thermal acoustical material which surrounds all stringers and frames are the best among filling in the blanks and only surrounds the stringers,and that gaps between trim panels are of significant for sound transmission,so it is needed for acoustical design of gaps between trim panels.