Evaluation of active control concepts for a self-adjusting membrane-type acoustic metamaterial
Evaluation of active control concepts for a self-adjusting membrane-type acoustic metamaterial
Membrane-type acoustic metamaterials (MAM) consist of a thin pre-stretched membrane with masses periodically attached to the membrane. MAM can be designed to be very lightweight and exhibit anti-resonances at low frequencies with sound transmission loss values that can be much higher than the mass-law. This makes MAM very appealing for different noise control applications. However, the typically narrow bandwidth of the anti-resonances is a big challenge for applying MAM to noise sources that consist of changing tonal frequencies and/or broadband noise. In this contribution the preliminary results of a concept study for a self-adjusting MAM using active control are presented. In this concept, the added mass is replaced by an inertial electrodynamic shaker which enables the actuation of the MAM. The performance of different control strategies is evaluated using analytical and numerical models of the MAM. In particular, this evaluation will focus on methods to enable the MAM to adjust its anti-resonances to changing tonal frequencies and to improve the broadband noise reduction of the MAM. Additionally, it is investigated how the performance of the active MAM is affected when not every unit cell of the MAM contains an actuator in order to reduce the complexity of the system.
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Langfeldt, Felix
2bf86877-f2cd-4c35-be0f-e38a718a915c
Cheer, Jordan
8e452f50-4c7d-4d4e-913a-34015e99b9dc
2022
Langfeldt, Felix
2bf86877-f2cd-4c35-be0f-e38a718a915c
Cheer, Jordan
8e452f50-4c7d-4d4e-913a-34015e99b9dc
Langfeldt, Felix and Cheer, Jordan
(2022)
Evaluation of active control concepts for a self-adjusting membrane-type acoustic metamaterial.
In Fortschritte der Akustik - DAGA 2022.
.
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Conference or Workshop Item
(Paper)
Abstract
Membrane-type acoustic metamaterials (MAM) consist of a thin pre-stretched membrane with masses periodically attached to the membrane. MAM can be designed to be very lightweight and exhibit anti-resonances at low frequencies with sound transmission loss values that can be much higher than the mass-law. This makes MAM very appealing for different noise control applications. However, the typically narrow bandwidth of the anti-resonances is a big challenge for applying MAM to noise sources that consist of changing tonal frequencies and/or broadband noise. In this contribution the preliminary results of a concept study for a self-adjusting MAM using active control are presented. In this concept, the added mass is replaced by an inertial electrodynamic shaker which enables the actuation of the MAM. The performance of different control strategies is evaluated using analytical and numerical models of the MAM. In particular, this evaluation will focus on methods to enable the MAM to adjust its anti-resonances to changing tonal frequencies and to improve the broadband noise reduction of the MAM. Additionally, it is investigated how the performance of the active MAM is affected when not every unit cell of the MAM contains an actuator in order to reduce the complexity of the system.
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langfeldt_cheer_2022_evaluation_of_active_control_concepts_for_a_self-adjusting_membrane-type
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Published date: 2022
Venue - Dates:
DAGA 2022 - 48. Jahrestagung für Akustik, , Stuttgart, Germany, 2022-03-21 - 2022-03-24
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Local EPrints ID: 456945
URI: http://eprints.soton.ac.uk/id/eprint/456945
PURE UUID: 88fa7be9-0dbc-400f-a524-8729d31ac782
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Date deposited: 17 May 2022 17:04
Last modified: 17 Mar 2024 04:11
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