Sound Blocking Using Acoustic Metamaterial Scaling

SungJun Park; Kyungjun Song; Jedo Kim

doi:10.7776/ASK.2015.34.5.371

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2015 Vol.34, Issue 5 Preview Page Next Page

Sound Blocking Using Acoustic Metamaterial Scaling 음향메타물질 단위격자 축소를 통한 소리 차단

30 September 2015. pp. 371-376

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Abstract

In this study, we use 1:1, 1:2, and 1:4 scale zig-zag shape acoustic metamaterial structure to achieve broad and effective sound blocking at the subwavelength scale. The SPL(Sound Pressure Level) results show that the SPL loss of the scaled metamaterial slab in series is a superposition of individual SPL losses. Also, we show that the metamaterial tailors the material properties to achieve high impedance and high refractive index using effective medium theory. Our results show that broad and effective sound blocking is possible at the subwavelength scale just by scaling acoustic metamaterial.

Keywords

Acoustic metamaterial

Sound blocking

Scaling

Multiphysics

본 연구는 지그재그 형상의 음향메타물질 구조체를 1:1, 1:2와 1:4의 축척으로 구성하여 순차배치시킴으로써 나타나는 광대역 음파차단 현상을 유한요소법을 이용하여 분석하였다. 그 결과 단위격자를 축소시킨 구조체의 투과 음압레벨(Sound Pressure Level, SPL)은 각 구조체의 독립적인 투과 특성을 중첩한 것과 같은 효과를 얻었으며 이로 인해 음파차단 대역폭과 크기가 현저히 증가하는 것을 볼 수 있다. 또한 유효물질 이론을 이용하여 음향메타물질이 매질의 임피던스와 굴절률을 높이는 것을 확인 하였다. 본 연구를 통해 다양한 메타물질을 이용하고 이를 단위격자를 축소시킴으로써 효과적인 광대역 소리차단을 실현 할 수 있을 것으로 기대된다.

키워드

음향메타물질

소음차단

단위격자 축소

멀티피직스

References

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Information

Publisher :The Acoustical Society of Korea
Publisher(Ko) :한국음향학회
Journal Title :The Journal of the Acoustical Society of Korea
Journal Title(Ko) :한국음향학회지
Volume : 34
No :5
Pages :371-376
Received Date : 2015-06-02
Revised Date : 2015-07-20
Accepted Date : 2015-08-19
DOI :https://doi.org/10.7776/ASK.2015.34.5.371

The Journal of the Acoustical Society of KoreaISSN:1225-4428(Print) 2287-3775(Online)한국음향학회

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