含对称三角形腔的波导管中宽带低频隔声效应

南京大学学报(自然科学版) ›› 2016, Vol. 52 ›› Issue (4): 619–.

含对称三角形腔的波导管中宽带低频隔声效应

葛　勇1，孙宏祥1，2*，袁寿其1，夏建平1，管义钧1

出版日期:2016-07-23 发布日期:2016-07-23
作者简介:1.江苏大学理学院，流体机械工程技术研究中心，镇江，212013；2．中国科学院声学研究所，声场声信息国家重点实验室，北京，100190
基金资助:
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 Received Date：2016－05－17 *Corresponding author，Email：jsdxshx@ujs.edu.cn

Broadband insulation of lowfrequency sound in a waveguide with symmetric triangle cavities

Ge Yong1，Sun Hongxiang1，2*，Yuan Shouqi1，Xia Jianping1，Guan Yijun1

Online:2016-07-23 Published:2016-07-23
About author:1.Faculty of Science，Research Center of Fluid Machinery Engineering and Technology，Jiangsu University，Zhenjiang，212013，China； 2.State Key Laboratory of Acoustics，Institute of Acoustics，Chinese Academy of Sciences，Beijing，100190，China

摘要/Abstract

摘要： 研究一种含两个对称三角形腔的波导管中宽频带低频隔声效应．波导管的隔声频带下限与带宽分别可达到140 Hz和2900 Hz，且所调控声波最大波长是三角形腔的尺寸13.6倍．这种隔声效应源于三角形腔截面积与波导管宽度的差异而引起的交界面上的高声反射率．在此基础上，研究波导管的结构参数(如波导管的宽度、三角形腔的底边长度与高度)及不同类型的腔(Helmholtz腔、矩形腔与直角三角形腔)对低频隔声效果的影响．结果表明，三角形腔的截面积和波导管宽度的差异与低频隔声效果密切相关．此外，由于对结构的本征模式的抑制作用，直角三角形腔所对应的低频隔声频带最宽．所提出的结构具有高隔声、宽频带、结构简单易实现等优点，在声学领域具着一定的潜在应用价值．

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 about λ/13.6.This phenomenon arises from high acoustic reflectance owing to the difference between the crosssectional 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 crosssectional 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.

葛　勇1，孙宏祥1，2*，袁寿其1，夏建平1，管义钧1 . 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–.

Ge Yong1，Sun Hongxiang1，2*，Yuan Shouqi1，Xia Jianping1，Guan Yijun1 . Broadband insulation of lowfrequency sound in a waveguide with symmetric triangle cavities[J]. Journal of Nanjing University(Natural Sciences), 2016, 52(4): 619–.

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