Perforated membrane-type acoustic metamaterials
Perforated membrane-type acoustic metamaterials
This letter introduces a modified design of membrane-type acoustic metamaterials (MAMs) with a ring mass and a perforation so that an airflow through the membrane is enabled. Simplified analytical investigations of the perforated MAM (PMAM) indicate that the perforation introduces a second anti-resonance, where the effective surface mass density of the PMAM is much higher than the static value. The theoretical results are validated using impedance tube measurements, indicating good agreement between the theoretical predictions and the measured data. The anti-resonances yield high low-frequency sound transmission loss values with peak values over 25 dB higher than the corresponding mass-law.
Acoustic, Effective mass, Membrane, Metamaterial, Perforated, Transmission loss
1457-1462
Langfeldt, F.
2bf86877-f2cd-4c35-be0f-e38a718a915c
Kemsies, H.
f9a7ab5a-41f4-474b-a2f0-d2d2bd59ddf8
Gleine, W.
6b99025f-b44a-46a8-b699-ec25962c7e75
Von Estorff, O.
7b2f7283-9bab-49e4-9ac8-baaa061e769d
25 April 2017
Langfeldt, F.
2bf86877-f2cd-4c35-be0f-e38a718a915c
Kemsies, H.
f9a7ab5a-41f4-474b-a2f0-d2d2bd59ddf8
Gleine, W.
6b99025f-b44a-46a8-b699-ec25962c7e75
Von Estorff, O.
7b2f7283-9bab-49e4-9ac8-baaa061e769d
Langfeldt, F., Kemsies, H., Gleine, W. and Von Estorff, O.
(2017)
Perforated membrane-type acoustic metamaterials.
Physics Letters, Section A: General, Atomic and Solid State Physics, 381 (16), .
(doi:10.1016/j.physleta.2017.02.036).
Abstract
This letter introduces a modified design of membrane-type acoustic metamaterials (MAMs) with a ring mass and a perforation so that an airflow through the membrane is enabled. Simplified analytical investigations of the perforated MAM (PMAM) indicate that the perforation introduces a second anti-resonance, where the effective surface mass density of the PMAM is much higher than the static value. The theoretical results are validated using impedance tube measurements, indicating good agreement between the theoretical predictions and the measured data. The anti-resonances yield high low-frequency sound transmission loss values with peak values over 25 dB higher than the corresponding mass-law.
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Published date: 25 April 2017
Keywords:
Acoustic, Effective mass, Membrane, Metamaterial, Perforated, Transmission loss
Identifiers
Local EPrints ID: 455621
URI: http://eprints.soton.ac.uk/id/eprint/455621
ISSN: 0375-9601
PURE UUID: 1267e51d-e5ce-47a3-91cf-1272acda9cc1
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Date deposited: 29 Mar 2022 16:45
Last modified: 06 Jun 2024 02:12
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Contributors
Author:
H. Kemsies
Author:
W. Gleine
Author:
O. Von Estorff
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