CAJ | 학술논문

鼓型消声器是由膨胀腔和张紧的轻膜片构成。理论和实验研究表明，在空气输运系统中使用鼓型消声器能够在低频区域内取得较佳的降噪效果。使用 Green 函数和 Kirchhoff-Helmholtz 积分来计算矩形管道中膜片的辐射声场，进一步计算得到膜片振动引起的、作用在膜片上的辐射声压和消声器的传递损失。对比验证表明，所提出的解析法的计算结果和有限元仿真结果吻合良好。计算结果表明：通过简单地调节膜片的固有频率不能达到拓宽双腔并联鼓型消声器消声频带的目的；增大膜片和管道的距离将降低鼓型消声器的传递损失；将单腔鼓型消声器分为两个串联腔室后，可以通过长短腔室传递损失曲线的互补实现宽频降噪效果，并且每个膜片所需的优化张紧力下降，但是腔室分离之后低频消声效果将降低。
고형소성기시유팽창강화장긴적경막편구성。이론화실험연구표명，재공기수운계통중사용고형소성기능구재저빈구역내취득교가적강조효과。사용 Green 함수화 Kirchhoff-Helmholtz 적분래계산구형관도중막편적복사성장，진일보계산득도막편진동인기적、작용재막편상적복사성압화소성기적전체손실。대비험증표명，소제출적해석법적계산결과화유한원방진결과문합량호。계산결과표명：통과간단지조절막편적고유빈솔불능체도탁관쌍강병련고형소성기소성빈대적목적；증대막편화관도적거리장강저고형소성기적전체손실；장단강고형소성기분위량개천련강실후，가이통과장단강실전체손실곡선적호보실현관빈강조효과，병차매개막편소수적우화장긴력하강，단시강실분리지후저빈소성효과장강저。
A drumlike silencer consists of an expansion chamber covered by light membranes under high tension. Theoretical and experimental study showed that introducing a drumlike silencer into a typical air conveying system can achieve a satisfactory quieting effect in a low-frequency region.Here,Green’s function and Kirchhoff-Helmholtz integral were used to solve the sound radiation of a membrane in a rectangular duct.After the vibration velocity of the membrane was obtained,the pressure perturbation induced by the membrane oscillation and the transmission loss of the silencer were calculated.The transmission loss calculated with the analytical method agreed well with that of the finite element method simulation.The results showed that simply adjusting the natural frequencies of membranes can't broaden the acoustic attenuation bandwidth of the drumlike silencer with two parallel cavities;and the performance of the silencer may degrade when the distance between the membrane and the duct increases;when the single cavity of a drumlike silencer is divided into two tadem cavities,the TL curves induced by longer and shorter cavities can compensate each other and the broad band acoustic attenuation can be reached,the optimal tension for each membrane can also drop,but the acoustic attenuation performance within a low-frequency region declines.