Broadband sound blocking in phononic crystals with rotationally symmetric inclusions

被引：9
|
作者：
Lee, Joong Seok [1 ,2 ]
Yoo, Sungmin [2 ]
Ahn, Young Kwan [2 ]
Kim, Yoon Young [2 ]
机构：
[1] Seoul Natl Univ, Inst Adv Machines & Design, 1 Gwanak Ro, Seoul 151744, South Korea
[2] Seoul Natl Univ, Inst Adv Machines & Design, Dept Mech & Aerosp Engn, 1 Gwanak Ro, Seoul 151744, South Korea
来源：
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA | 2015年 / 138卷 / 03期
基金：
新加坡国家研究基金会;
关键词：
PERIODIC ARRAYS; GAPS; ATTENUATION; RODS;
D O I：
10.1121/1.4929625
中图分类号：
O42 [声学];
学科分类号：
070206 ; 082403 ;
摘要：
This paper investigates the feasibility of broadband sound blocking with rotationally symmetric extensible inclusions introduced in phononic crystals. By varying the size of four equally shaped inclusions gradually, the phononic crystal experiences remarkable changes in its band-stop properties, such as shifting/widening of multiple Bragg bandgaps and evolution to resonance gaps. Necessary extensions of the inclusions to block sound effectively can be determined for given incident frequencies by evaluating power transmission characteristics. By arraying finite dissimilar unit cells, the resulting phononic crystal exhibits broadband sound blocking from combinational effects of multiple Bragg scattering and local resonances even with small-numbered cells. (C) 2015 Acoustical Society of America
引用
收藏
页码：EL217 / EL222
页数：6
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