Anisotropic acoustical properties of sintered fibrous metals

被引：32

作者：

Meng, H. ^{[1
,2
]}

Ao, Q. B. ^{[3
]}

Ren, S. W. ^{[1
,2
]}

Xin, F. X. ^{[1
,2
]}

Tang, H. P. ^{[3
]}

Lu, T. J. ^{[1
,2
]}

机构：

[1] Xi An Jiao Tong Univ, Multidisplinary Res Ctr Lightweight Struct & Mat, Xian 710049, Peoples R China

[2] Xi An Jiao Tong Univ, Sch Aerosp, State Key Lab Mech Struct Strength & Vibrat, Xian 710049, Peoples R China

[3] Northwest Inst Nonferrous Met Res, State Key Lab Porous Met Mat, Xian 710016, Peoples R China

来源：

COMPOSITES SCIENCE AND TECHNOLOGY | 2015年 / 107卷

基金：

中国国家自然科学基金;

关键词：

Fibers; Mechanical properties; Anisotropy; Acoustic emission; SOUND-TRANSMISSION; FIBER MATERIALS; PERMEABILITY; PREDICTION; ABSORPTION; AIR;

D O I：

10.1016/j.compscitech.2014.11.020

中图分类号：

TB33 [复合材料];

学科分类号：

摘要：

A combined theoretical and experimental study is carried out to investigate the anisotropic acoustic properties of sintered fibrous metals. In the theoretical model, based on the transversal and longitudinal dynamic mass densities and effective bulk modulus of randomly placed parallel fibers, the dynamic mass densities and effective dynamic bulk modulus of a sintered fibrous metal in the direction normal and parallel to its surface are obtained. Sound absorption coefficient, sound speed and attenuation coefficient in each of the two directions are calculated once the dynamic mass densities and effective dynamic bulk modulus are determined. For validation, experimental measurements are performed, with good agreement between theoretical prediction and measurement data achieved. Subsequent numerical investigations focus on the influence of fiber diameter and porosity on the anisotropic acoustical properties of the sintered fibrous metal. The sintered fibrous metal exhibits better sound absorption/attenuation performance in the parallel direction than in the normal direction. The anisotropy in acoustical properties increases with decreasing fiber diameter and porosity due mainly to increasing interactions between adjacent fibers. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：10 / 17

页数：8

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