Design and experimental validation of a labyrinthine multi path meta silencer for low frequency attenuation

Minjin Kang; Kyungjun Song; SangKyung Sung; Hongju Gu

doi:10.7776/ASK.2025.44.6.557

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2025 Vol.44, Issue 6 Next Page

Research Article

Design and experimental validation of a labyrinthine multi path meta silencer for low frequency attenuation 미로형 다중 경로 메타 소음기의 저주파 차음 설계와 검증

30 November 2025. pp. 557-567

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Abstract

This study proposes a meta-structure-based multi path reflective silencer to address noise issues in space constrained environments, such as vehicles and ships. The acoustic characteristics of the silencer were analyzed using the Transfer Matrix Method (TMM) and the Finite Element Method (FEM), and variations in resonance frequency and Sound Transmission Loss (STL) were examined by changing the length and number of internal walls. In particular, it was demonstrated that connecting different silencer units in series expands the noise attenuation frequency range. The impedance tube experiments conducted on the proposed model showed high agreement with the TMM and FEM predictions, validating the reliability of the proposed analytical model. These results indicate that the multi path design concept based on meta-structures is effective in enhancing low frequency noise reduction in limited spaces, and suggest its practical applicability to exhaust noise reduction systems in vehicles, ships, and compact equipment.

Keywords

Meta-Structure

Transfer Matrix Method (TMM)

Finite Element Method (FEM)

Impedance tube

Sound Transmission Loss (STL)

본 연구에서는 차량 및 선박과 같이 한정된 공간 내에서의 소음 문제 해결을 위해 메타 구조 기반 다중 경로 반사형 소음기를 제안한다. Transfer Matrix Method(TMM)와 Finite Element Method(FEM)을 활용하여 소음기의 음향 특성을 분석하였으며, 내부 벽체의 길이와 개수 변화에 따른 공명 주파수 이동과 음향 투과 손실(Sound Transmission Loss, STL) 변화를 확인하였다. 특히, 서로 다른 구조체를 직렬로 연결함으로써 소음 저감 주파수 대역이 확장됨을 입증하였다. 제안된 모델의 임피던스 튜브 실험 결과는 TMM 및 FEM 해석 결과와 높은 일치도를 보여 제안된 해석 모델의 신뢰성을 입증하였다. 이러한 결과는 메타 구조 기반의 다중 경로 설계 개념이 제한된 공간내에서 저주파 소음 저감 성능에 효과적임을 시사하며, 차량, 선박, 소형 장비 등 배기 소음 저감 시스템에 실질적인 적용 가능성을 제시한다.

키워드

메타 구조

전달 행렬법

유한요소해석

임피던스 튜브

음향 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 : 44
No :6
Pages :557-567
Received Date : 2025-08-28
Accepted Date : 2025-10-24
DOI :https://doi.org/10.7776/ASK.2025.44.6.557

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

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