作者：陈明^1,2, 李鹏², 罗斌²

作者单位：1. 贵州工业职业技术学院, 贵州 贵阳 550001;
2. 东南大学微电子机械系统教育部重点实验室, 江苏 南京 210096

关键词：亥姆霍兹;共振器;穿孔板;颈部材料;吸声

摘要：

为改善亥姆霍兹共振器的吸声系数和吸声带宽，采用不同参数的穿孔材料优化共振器吸声效果。鉴于多孔传声过程较为复杂，利用平行穿孔板对声阻抗进行研究，建立颈部入口声阻抗计算模型。搭建管道声学实验台，在声学管道上游布置扬声器，在管道下游布置亥姆霍兹共振器。测量不同颈部材料下的静流阻率和吸声系数，计算共振器颈部入口声阻抗。研究表明：颈部材料中的管流效应不可忽略，穿孔率对静流阻率的影响很大，平均流速相同时，孔径越大，静流阻率越小；大孔径穿孔板具有明显优势，因此设计亥姆霍兹共振器时穿孔板孔径应大于4 mm。

Neck materials influence to Helmholtz resonator sound absorption performance

CHEN Ming^1,2, LI Peng², LUO Bin²

1. Guizhou Industry Polytechnic College, Guiyang 550001, China;
2. Key Lab of MEMS of Education Ministry, Southeast University, Nanjing 210096, China

Abstract: To improve Helmholtz resonators' acoustic absorptivity and sound absorption bandwidth, sound absorption materials with different parameters were used to optimize resonator sound absorption effect. In view of the porous sound transmission process complicated, parallel perforations were used in acoustic impedance study. The Helmholtz resonator neck entrance acoustic impedance calculation model has been established. The duct acoustic test bench was built, which installed speaker upstream and Helmholtz resonator downstream. Various neck materials' static resistivity and absorption coefficient were measured. And the acoustic impedance of resonator neck entrance was calculated. Research shows that: neck materials' tube flow effect cannot be neglected; perforation rate has a great influence on static resistivity; when average flow velocity was equal, the larger aperture, the smaller static resistivity; perforation plate with large aperture has obvious advantages, Helmholtz resonator perforation plate diameter should be greater than 4 mm.

Keywords: Helmholtz;resonator;perforation plate;neck materials;sound absorption

2016, 42(8): 127-130  收稿日期: 2015-11-15;收到修改稿日期: 2016-1-5

基金项目: 国家自然科学基金项目（51577029）；中央高校基本业务科研专项经费资助项目（2013XS038）

作者简介: 陈明(1979-),男,贵州印江县人,讲师,研究方向为电子科学与技术。

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