利用共振吸声器改善飞机壁板的隔声量

 本文根据共振吸声器的吸声原理,设计了适合于螺旋浆推进的飞机舱壁板之间安装的小体积、低频共振吸声器。对单个共振吸声器的吸声系数进行了测量,理论和实验结果的一致性是令人满意的。在飞机壁板间安装了共振频率为85Hz和160Hz的混合共振器阵,使包含该频率的1/3频程内的隔声量分别提高了4dB和6.5dB,共振频率处的隔声量分别提高了5dB和7dB。

IMPROVEMENT IN TRANSMISSION LOSS OF AIRCRAFT DOUBLE WALL WITH RESONATORS

A little volume low frequency resonator applicable to double wall confi guration of propeller-driven aircraft was designcd on the basis of the principle of Holmheltz resonator. The normal incidence absorption coefficient of the various single resonator has been measured. The agreement between theoretical and experimental results is encouraging. An array of resonators whose resonant frequency at 85Hz and 160Hz, respectively, are installed between aircraft double-pannel, and it has been shown that transmission loss of the double wall constrncture with resonators improve 4dB and 6.5dB in 1/3 octave bandwidth at 80Hz and 160Hz centre frequency, respectively, and 5dB and 7dB at resonant frequencies, compared with that of the double wall configuration without resonators.