Impact of surface roughness on acoustic resonators made of closed-cell lightweight foams
Impact of surface roughness on acoustic resonators made of closed-cell lightweight foams
Acoustic resonators, such as Helmholtz resonators or slit resonators, are known as a highly efficient noise control mean for narrow frequency band applications. Their simple passive structure can be built from many different materials. If a noise control treatment is highly restricted by the additional weight, those resonators could be built out of a closed-cell lightweight foam. Because of both, manufacturing reasons and the cellular microstructure of the foam, the surface of such resonators is not perfectly smooth. Especially when openings of the resonators are milled in the foam, the surface roughness inside the opening might be relatively high. This leads to a certain damped behavior of the resonator that cannot be captured by current models. In this contribution, the effect of surface roughness on the airflow resistance and its impact on the acoustic behavior of slit resonators, like the absorption coefficient or the transmission loss for wall integrated means, is studied experimentally.
Broadband absorption behavior, Helmholtz resonators, Surface roughness
International Institute of Acoustics and Vibration
Hoppen, Hannah
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Suresh, Hrishikesh
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Langfeldt, Felix
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Gleine, Wolfgang
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von Estorff, Otto
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2021
Hoppen, Hannah
f609ed2b-6b7a-4a2e-89c9-45fd11ee50a0
Suresh, Hrishikesh
92d14ef8-ea1a-47c0-af8b-c831ab681491
Langfeldt, Felix
2bf86877-f2cd-4c35-be0f-e38a718a915c
Gleine, Wolfgang
6b99025f-b44a-46a8-b699-ec25962c7e75
von Estorff, Otto
7b2f7283-9bab-49e4-9ac8-baaa061e769d
Hoppen, Hannah, Suresh, Hrishikesh, Langfeldt, Felix, Gleine, Wolfgang and von Estorff, Otto
(2021)
Impact of surface roughness on acoustic resonators made of closed-cell lightweight foams.
Carletti, Eleonora, Crocker, Malcolm, Pawelczyk, Marek and Tuma, Jiri
(eds.)
In Advances in Acoustics, Noise and Vibration - 2021: Proceedings of the 27th International Congress on Sound and Vibration, ICSV 2021.
International Institute of Acoustics and Vibration..
Record type:
Conference or Workshop Item
(Paper)
Abstract
Acoustic resonators, such as Helmholtz resonators or slit resonators, are known as a highly efficient noise control mean for narrow frequency band applications. Their simple passive structure can be built from many different materials. If a noise control treatment is highly restricted by the additional weight, those resonators could be built out of a closed-cell lightweight foam. Because of both, manufacturing reasons and the cellular microstructure of the foam, the surface of such resonators is not perfectly smooth. Especially when openings of the resonators are milled in the foam, the surface roughness inside the opening might be relatively high. This leads to a certain damped behavior of the resonator that cannot be captured by current models. In this contribution, the effect of surface roughness on the airflow resistance and its impact on the acoustic behavior of slit resonators, like the absorption coefficient or the transmission loss for wall integrated means, is studied experimentally.
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Published date: 2021
Venue - Dates:
27th International Congress on Sound and Vibration, ICSV 2021, , Virtual, Online, 2021-07-11 - 2021-07-16
Keywords:
Broadband absorption behavior, Helmholtz resonators, Surface roughness
Identifiers
Local EPrints ID: 455682
URI: http://eprints.soton.ac.uk/id/eprint/455682
ISSN: 2329-3675
PURE UUID: 9b906145-00cf-4755-812a-8071f3730a34
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Date deposited: 30 Mar 2022 16:52
Last modified: 18 Mar 2024 04:05
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Contributors
Author:
Hannah Hoppen
Author:
Hrishikesh Suresh
Author:
Wolfgang Gleine
Author:
Otto von Estorff
Editor:
Eleonora Carletti
Editor:
Malcolm Crocker
Editor:
Marek Pawelczyk
Editor:
Jiri Tuma
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