A preliminary investigation of an active membrane-type acoustic metamaterial
A preliminary investigation of an active membrane-type acoustic metamaterial
One of the most promising features of membrane-type acoustic metamaterials (MAM) is their anti-resonance at low frequencies, which typically exhibits sound transmission loss values that can significantly exceed the corresponding mass-law values. The bandwidth of this anti-resonance, however, is usually very small, which limits the applicability of MAM in practical noise control problems. In previous research it has been shown that different types of actuators (e.g. magnets, electrodes, or pressurized air) can be used to adjust the anti-resonance frequency of MAM, for example to adapt to changing tonal frequencies. However, these actuation principles require additional components to be added to the otherwise lightweight MAM. To overcome these limitations, this paper will present preliminary results from an experimental study of a smart MAM which has the sensors and actuators compactly embedded within the added mass located at the center of the membrane of the unit cell. A small accelerometer is used to measure the vibration of the added mass and this signal is fed back to a controller, which is used to actuate the MAM using a small electrodynamic exciter. An impedance tube is used to measure the sound transmission through the smart MAM and different control algorithms are compared.
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)
A preliminary investigation of an active membrane-type acoustic metamaterial.
In Proceedings of Inter-Noise 2022.
12 pp
.
Record type:
Conference or Workshop Item
(Paper)
Abstract
One of the most promising features of membrane-type acoustic metamaterials (MAM) is their anti-resonance at low frequencies, which typically exhibits sound transmission loss values that can significantly exceed the corresponding mass-law values. The bandwidth of this anti-resonance, however, is usually very small, which limits the applicability of MAM in practical noise control problems. In previous research it has been shown that different types of actuators (e.g. magnets, electrodes, or pressurized air) can be used to adjust the anti-resonance frequency of MAM, for example to adapt to changing tonal frequencies. However, these actuation principles require additional components to be added to the otherwise lightweight MAM. To overcome these limitations, this paper will present preliminary results from an experimental study of a smart MAM which has the sensors and actuators compactly embedded within the added mass located at the center of the membrane of the unit cell. A small accelerometer is used to measure the vibration of the added mass and this signal is fed back to a controller, which is used to actuate the MAM using a small electrodynamic exciter. An impedance tube is used to measure the sound transmission through the smart MAM and different control algorithms are compared.
Text
internoise-2022_paper
- Accepted Manuscript
More information
Accepted/In Press date: 31 May 2022
Published date: 2022
Venue - Dates:
Inter Noise 2022, Scottish Event Campus, Glasgow, United Kingdom, 2022-08-21 - 2022-08-24
Identifiers
Local EPrints ID: 467909
URI: http://eprints.soton.ac.uk/id/eprint/467909
PURE UUID: 6bf6d608-308c-48c2-a962-2dfb0ee2e9c7
Catalogue record
Date deposited: 25 Jul 2022 16:36
Last modified: 17 Mar 2024 04:11
Export record
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics
