Design of acoustic meta-material silencer based on coiled up space

Ki-Hwoon Shim; Jun-Young Jang; Ho-Jin Kwon; Kyungjun Song

doi:10.7776/ASK.2021.40.1.031

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2021 Vol.40, Issue 1 Preview Page Next Page

Research Article

Design of acoustic meta-material silencer based on coiled up space 지그재그 구조 메타물질을 이용한 음향 소음기 설계

31 January 2021. pp. 31-37

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Abstract

In this paper, we design an acoustic meta-material silencer that operates at low frequency to reduce noise in duct. A high refractive index meta-material silencer is demonstrated with a combination of zigzag structured thin waveguide and helmholtz resonator, which reduces the speed of sound. Finite Element Method (FEM) analysis via thermo-viscous acoustic mesh is performed in order to calculate thermo-viscous dissipation in sub-wavelength waveguide. Sound power reflection, transmission and absorption coefficients are obtained utilizing 4-Microphone Method. The results show that cut-off frequency and transmission loss can be controlled through adjusting intervals of the zigzag structures. A wide-band acoustic silencer is also suggested by connecting meta-materials in series or parallel.

Keywords

Acoustic meta-material

Silencer

Coiled up space

Transmission loss

본 논문은 덕트 내 소음을 저감하기 위해 저주파 대역에서 작동하는 음향메타물질 소음기를 개발하는데 목적이 있다. 지그재그 도파관 구조물과 헬름홀츠 형상을 조합하여, 음파의 공간상 진행 속도를 줄이는 고 굴절 메타물질 기반 음향 소음기를 설계하였다. 파장보다 매우 작은 도파관에서 점성 및 열 감쇠 효과를 계산하기 위해 점성 및 열 매쉬를 도입하여 Finite Element Method(FEM) 해석을 진행하였다. 4-Microphone Method를 이용하여 해석 결과로부터 반사율, 투과율과 흡음률을 구했으며, 지그재그 구조 소음기의 구조물 간격을 변화시켜 차단 주파수와 투과손실을 조절할 수 있음을 확인하였다. 또한, 메타물질들을 직렬 및 병렬 배열하여 광대역으로 소음을 차단하는 메타물질 소음기를 제시하였다.

키워드

음향 메타물질

소음기

지그재그 구조

투과 손실

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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 : 40
No :1
Pages :31-37
Received Date : 2020-12-09
Accepted Date : 2020-12-28
DOI :https://doi.org/10.7776/ASK.2021.40.1.031

The Journal of the Acoustical Society of Korea ISSN:1225-4428(Print) 2287-3775(Online) 한국음향학회지

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