A multilayer microperforated panel prototype for broadband sound absorption at low frequencies

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Microperforated panel (MPP) absorbers are one of the most promising alternatives to porous sound absorbing materials. However, these structures cannot achieve high and broadband absorption at low frequencies. To be effective, once defined the material properties the geometrical parameters of the absorber need to be optimized to match the prescribed absorption level. This paper presents a multiple layer MPP absorber with a high sound absorption coefficient and broadband absorption at low frequencies. An electro-acoustical equivalent circuit model was used for a parametric analysis to study the relationships between the absorption mechanism and the absorbers geometrical parameters in the proposed multilayer MPP. A prototype of this absorber was machined and tested in an impedance tube test ring and the experimental acoustical properties in terms of absorption coefficient were extracted using the transfer function method. It was demonstrated that the five-layer MPP absorber was capable of guaranteeing a high absorption (constantly over 90%) in a frequency range from 400 to 2000 Hz. The results indicate that the proposed multilayer MPP absorber provides a good alternative for sound absorption applications.

Original languageEnglish
Pages (from-to)134-144
Number of pages11
JournalApplied Acoustics
Volume146
Early online date24 Nov 2018
DOIs
Publication statusPublished - 1 Mar 2019

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

Cite this

@article{f5219eadacb047c597686f7a4cdcc935,
title = "A multilayer microperforated panel prototype for broadband sound absorption at low frequencies",
abstract = "Microperforated panel (MPP) absorbers are one of the most promising alternatives to porous sound absorbing materials. However, these structures cannot achieve high and broadband absorption at low frequencies. To be effective, once defined the material properties the geometrical parameters of the absorber need to be optimized to match the prescribed absorption level. This paper presents a multiple layer MPP absorber with a high sound absorption coefficient and broadband absorption at low frequencies. An electro-acoustical equivalent circuit model was used for a parametric analysis to study the relationships between the absorption mechanism and the absorbers geometrical parameters in the proposed multilayer MPP. A prototype of this absorber was machined and tested in an impedance tube test ring and the experimental acoustical properties in terms of absorption coefficient were extracted using the transfer function method. It was demonstrated that the five-layer MPP absorber was capable of guaranteeing a high absorption (constantly over 90{\%}) in a frequency range from 400 to 2000 Hz. The results indicate that the proposed multilayer MPP absorber provides a good alternative for sound absorption applications.",
author = "F. Bucciarelli and {Malfense Fierro}, {G. P.} and M. Meo",
year = "2019",
month = "3",
day = "1",
doi = "10.1016/j.apacoust.2018.11.014",
language = "English",
volume = "146",
pages = "134--144",
journal = "Applied Acoustics",
issn = "0003-682X",
publisher = "Elsevier",

}

TY - JOUR

T1 - A multilayer microperforated panel prototype for broadband sound absorption at low frequencies

AU - Bucciarelli, F.

AU - Malfense Fierro, G. P.

AU - Meo, M.

PY - 2019/3/1

Y1 - 2019/3/1

N2 - Microperforated panel (MPP) absorbers are one of the most promising alternatives to porous sound absorbing materials. However, these structures cannot achieve high and broadband absorption at low frequencies. To be effective, once defined the material properties the geometrical parameters of the absorber need to be optimized to match the prescribed absorption level. This paper presents a multiple layer MPP absorber with a high sound absorption coefficient and broadband absorption at low frequencies. An electro-acoustical equivalent circuit model was used for a parametric analysis to study the relationships between the absorption mechanism and the absorbers geometrical parameters in the proposed multilayer MPP. A prototype of this absorber was machined and tested in an impedance tube test ring and the experimental acoustical properties in terms of absorption coefficient were extracted using the transfer function method. It was demonstrated that the five-layer MPP absorber was capable of guaranteeing a high absorption (constantly over 90%) in a frequency range from 400 to 2000 Hz. The results indicate that the proposed multilayer MPP absorber provides a good alternative for sound absorption applications.

AB - Microperforated panel (MPP) absorbers are one of the most promising alternatives to porous sound absorbing materials. However, these structures cannot achieve high and broadband absorption at low frequencies. To be effective, once defined the material properties the geometrical parameters of the absorber need to be optimized to match the prescribed absorption level. This paper presents a multiple layer MPP absorber with a high sound absorption coefficient and broadband absorption at low frequencies. An electro-acoustical equivalent circuit model was used for a parametric analysis to study the relationships between the absorption mechanism and the absorbers geometrical parameters in the proposed multilayer MPP. A prototype of this absorber was machined and tested in an impedance tube test ring and the experimental acoustical properties in terms of absorption coefficient were extracted using the transfer function method. It was demonstrated that the five-layer MPP absorber was capable of guaranteeing a high absorption (constantly over 90%) in a frequency range from 400 to 2000 Hz. The results indicate that the proposed multilayer MPP absorber provides a good alternative for sound absorption applications.

UR - http://www.scopus.com/inward/record.url?scp=85057041292&partnerID=8YFLogxK

U2 - 10.1016/j.apacoust.2018.11.014

DO - 10.1016/j.apacoust.2018.11.014

M3 - Article

VL - 146

SP - 134

EP - 144

JO - Applied Acoustics

JF - Applied Acoustics

SN - 0003-682X

ER -