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Low-Frequency-Noise Attenuation through Extended-Neck Double-Degree-of-Freedom Helmholtz Resonators

Abhishek Gautam, Alper Celik Orcid Logo, Mahdi Azarpeyvand

Acoustics, Volume: 5, Issue: 4, Pages: 1123 - 1135

Swansea University Author: Alper Celik Orcid Logo

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DOI (Published version): 10.3390/acoustics5040063

Abstract

The use of acoustic liners, based on double-degree-of-freedom Helmholtz resonators, for low-frequency-noise attenuation is limited by the volume of individual resonating cavities. This study investigates the effect of the septum neck length on the acoustic performance of double-degree-of-freedom res...

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Published in: Acoustics
ISSN: 2624-599X
Published: MDPI AG 2023
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URI: https://cronfa.swan.ac.uk/Record/cronfa65596
first_indexed 2024-02-08T12:55:31Z
last_indexed 2024-11-25T14:16:25Z
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spelling 2024-04-04T13:33:50.4699412 v2 65596 2024-02-08 Low-Frequency-Noise Attenuation through Extended-Neck Double-Degree-of-Freedom Helmholtz Resonators 3cb1f558a4b194101105e9c1e8d59cbf 0000-0002-2492-4625 Alper Celik Alper Celik true false 2024-02-08 ACEM The use of acoustic liners, based on double-degree-of-freedom Helmholtz resonators, for low-frequency-noise attenuation is limited by the volume of individual resonating cavities. This study investigates the effect of the septum neck length on the acoustic performance of double-degree-of-freedom resonators, both experimentally and numerically, for varying cavity volume ratios. The underlying sound attenuation mechanism is studied by analysing the acoustic pressure fields within the resonator cavities. An increase in the septum neck is shown to lower the frequencies affected by the resonator. In addition, it deteriorates and significantly improves the sound attenuation performance at the primary and secondary peak transmission-loss frequencies, respectively. Journal Article Acoustics 5 4 1123 1135 MDPI AG 2624-599X Helmholtz resonator; impedance tube; acoustic liner 3 12 2023 2023-12-03 10.3390/acoustics5040063 COLLEGE NANME Aerospace, Civil, Electrical, and Mechanical Engineering COLLEGE CODE ACEM Swansea University Another institution paid the OA fee he research was supported by the European Commission through project AERIALIST (AdvancEd aicRaft-noIse-AlLeviationdevIceS using meTamaterials), H2020-MG-1.4-2016-2017, project no. 723367. 2024-04-04T13:33:50.4699412 2024-02-08T12:54:27.6016954 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Aerospace Engineering Abhishek Gautam 1 Alper Celik 0000-0002-2492-4625 2 Mahdi Azarpeyvand 3 65596__29918__463d56879b9a44e8b14374433ee54a97.pdf 65596.VOR.pdf 2024-04-04T13:32:19.4360247 Output 3037841 application/pdf Version of Record true © 2023 by the authors. This is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license. true eng https://creativecommons.org/licenses/by/4.0/
title Low-Frequency-Noise Attenuation through Extended-Neck Double-Degree-of-Freedom Helmholtz Resonators
spellingShingle Low-Frequency-Noise Attenuation through Extended-Neck Double-Degree-of-Freedom Helmholtz Resonators
Alper Celik
title_short Low-Frequency-Noise Attenuation through Extended-Neck Double-Degree-of-Freedom Helmholtz Resonators
title_full Low-Frequency-Noise Attenuation through Extended-Neck Double-Degree-of-Freedom Helmholtz Resonators
title_fullStr Low-Frequency-Noise Attenuation through Extended-Neck Double-Degree-of-Freedom Helmholtz Resonators
title_full_unstemmed Low-Frequency-Noise Attenuation through Extended-Neck Double-Degree-of-Freedom Helmholtz Resonators
title_sort Low-Frequency-Noise Attenuation through Extended-Neck Double-Degree-of-Freedom Helmholtz Resonators
author_id_str_mv 3cb1f558a4b194101105e9c1e8d59cbf
author_id_fullname_str_mv 3cb1f558a4b194101105e9c1e8d59cbf_***_Alper Celik
author Alper Celik
author2 Abhishek Gautam
Alper Celik
Mahdi Azarpeyvand
format Journal article
container_title Acoustics
container_volume 5
container_issue 4
container_start_page 1123
publishDate 2023
institution Swansea University
issn 2624-599X
doi_str_mv 10.3390/acoustics5040063
publisher MDPI AG
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Aerospace Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Aerospace Engineering
document_store_str 1
active_str 0
description The use of acoustic liners, based on double-degree-of-freedom Helmholtz resonators, for low-frequency-noise attenuation is limited by the volume of individual resonating cavities. This study investigates the effect of the septum neck length on the acoustic performance of double-degree-of-freedom resonators, both experimentally and numerically, for varying cavity volume ratios. The underlying sound attenuation mechanism is studied by analysing the acoustic pressure fields within the resonator cavities. An increase in the septum neck is shown to lower the frequencies affected by the resonator. In addition, it deteriorates and significantly improves the sound attenuation performance at the primary and secondary peak transmission-loss frequencies, respectively.
published_date 2023-12-03T20:28:21Z
_version_ 1821348097593180160
score 11.04748

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