南京大学学报（自然科学版）2016，Vol.52Issue(4)：619-626,8.DOI:10.13232/j.cnki.jnju.2016.04.006
含对称三角形腔的波导管中宽带低频隔声效应
Broadband insulation of low-frequency sound in a waveguide with symmetric triangle cavities
摘要
Abstract
We report a broadband sound insulation effect through a waveguide with two triangle cavities.The lower cutoff frequency and bandwidth of the sound insulation could reach about 140 Hz and 2900 Hz,respectively,and the length of the triangle cavity is aboutλ/13.6.This phenomenon arises from high acoustic reflectance owing to the difference between the cross-sectional areas of the waveguide and triangle cavities.In addition,we also investigate the influences of the parameters of waveguide,such as the wide of the waveguide,the base and height of both triangle cavities,on the characteristics of the sound insulation.Besides,the sound insulation in the waveguide with other types of cavities(Helmholtz cavities,rectangle cavities,and right triangle cavities)on the sound insulation is also discussed in detail.The results show that the performance of sound insulation is closely related to the difference between the cross-sectional areas of the waveguide and triangle cavities,and the wider bandwidth of the sound insulation is obtained by using the right triangle cavities owing to the inhibition of the eigen modes.The design has the advantages of high sound insulation,broad bandwidth,and simple structure as well as being easy to be achieved.关键词
声/波,隔/声,波导管,腔Key words
sound waves/sound insulation/waveguide/cavity分类
物理学引用本文复制引用
葛勇,孙宏祥,袁寿其,夏建平,管义钧..含对称三角形腔的波导管中宽带低频隔声效应[J].南京大学学报（自然科学版）,2016,52(4):619-626,8.基金项目
Foundation Item:Major Program of National Natural Science Foundation of China(51239005),National Natural Science Foundation of China(11404147),Jiangsu Provincial Natural Science Foundation(BK20140519),China Postdoctoral Science Foundation(2015M571672),Research Fund for Advanced Talents of Jiangsu University(11JDG118),Training Project of Young Backbone Teachers of Jiangsu University （51239005）
