Absorption of a rigid frame porous layer with periodic circular inclusions backed by a periodic grating

被引：33

作者：

Groby, J. -P. ^{[1
]}

Duclos, A. ^{[1
]}

Dazel, O. ^{[1
]}

Boeckx, L. ^{[2
]}

Lauriks, W. ^{[3
]}

机构：

[1] Univ Maine, CNRS, Acoust Lab, UMR6613, F-72085 Le Mans 9, France

[2] Huntsman Europe, B-3078 Everberg, Belgium

[3] Katholieke Univ Leuven, Lab Acoust & Thermal Phys, B-3001 Heverlee, Belgium

来源：

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA | 2011年 / 129卷 / 05期

关键词：

BLOCH SURFACE-WAVES; TRAPPED MODES; ACOUSTIC RESPONSE; PROPAGATION; CYLINDERS; MEDIA; PLATE;

D O I：

10.1121/1.3561664

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

The acoustic properties of a periodic rigid frame porous layer with multiple irregularities in the rigid backing and embedded rigid circular inclusions are investigated theoretically and numerically. The theoretical representation of the sound field in the structure is obtained using a combination of multipole method that accounts for the periodic inclusions and multi-modal method that accounts for the multiple irregularities of the rigid backing. The theoretical model is validated against a finite element method. The predictions show that the acoustic response of this structure exhibits quasi-total, high absorption peaks at low frequencies which are below the frequency of the quarter-wavelength resonance typical for a flat homogeneous porous layer backed by a rigid plate. This result is explained by excitation of additional modes in the porous layer and by a complex interaction between various acoustic modes. These modes relate to the resonances associated with the presence of a profiled rigid backing and rigid inclusions in the porous layer. (C) 2011 Acoustical Society of America. [DOI:10.1121/1.3561664]

引用

页码：3035 / 3046

页数：12

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