Low frequency sound attenuation in a flow duct using a thin slow sound material

被引：28

作者：

Auregan, Yves ^{[1
]}

Farooqui, Maaz ^{[2
]}

Groby, Jean-Philippe ^{[1
]}

机构：

[1] Univ Maine, Lab Acoust, UMR 6613, CNRS, Ave O Messiaen, F-72085 Le Mans 9, France

[2] Ain Shams Univ, Fac Engn, Sound & Vibrat Lab, Cairo 11517, Egypt

来源：

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA | 2016年 / 139卷 / 05期

关键词：

BOUNDARY-CONDITION; PROPAGATION; TUBES;

D O I：

10.1121/1.4951028

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

A thin subwavelength material that can be flush mounted in a duct and that gives an attenuation band at low frequencies in air flow channels is presented. To decrease the material thickness, the sound is slowed in the material using folded side branch tubes. The impedance of the material is compared to the optimal value given by the Cremer condition, which can differ greatly from the air characteristic impedance. Grazing flow on this material increases the losses at the interface between the flow and the material. (c) 2016 Acoustical Society of America

引用

页码：EL149 / EL153

页数：5

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