Optimisation of a multi-layered meta-partition for broadband low-frequency sound insulation
Optimisation of a multi-layered meta-partition for broadband low-frequency sound insulation
Acoustic metamaterials, which are usually composed of periodic subwavelength unit cells, are known for their unique capabilities in controlling sound wave propagation. One application of such metamaterials is in using their resonant properties as a lightweight and compact solution to the problematic low frequency range from conventional sound insulation treatments. However, the resonant property of metamaterials only allows for a narrow stopband with superior sound insulation. This paper aims to achieve broadband sound transmission loss in the low frequency range by proposing a multi-layered partition encompassing different metamaterial types. An analytical model of the partition is derived by treating the metamaterial layers with effective material properties inferred from a homogenization method. By applying constraints on the metamaterial and partition properties, such as the overall mass and thickness of the partition, optimizations are then performed to maximize the sound transmission loss within a specific frequency band. A numerical model of the optimized partition is produced to validate the analytical model
Acoustic Metamaterials, Sound Insulation, Multi-layer Partition, Broadband Low Frequency
Leung, Kenneth
c0781d36-0c82-47aa-8cfa-219bd2e47334
Langfeldt, Felix
2bf86877-f2cd-4c35-be0f-e38a718a915c
10 July 2023
Leung, Kenneth
c0781d36-0c82-47aa-8cfa-219bd2e47334
Langfeldt, Felix
2bf86877-f2cd-4c35-be0f-e38a718a915c
Leung, Kenneth and Langfeldt, Felix
(2023)
Optimisation of a multi-layered meta-partition for broadband low-frequency sound insulation.
In Forum Acusticum 2023.
8 pp
.
Record type:
Conference or Workshop Item
(Paper)
Abstract
Acoustic metamaterials, which are usually composed of periodic subwavelength unit cells, are known for their unique capabilities in controlling sound wave propagation. One application of such metamaterials is in using their resonant properties as a lightweight and compact solution to the problematic low frequency range from conventional sound insulation treatments. However, the resonant property of metamaterials only allows for a narrow stopband with superior sound insulation. This paper aims to achieve broadband sound transmission loss in the low frequency range by proposing a multi-layered partition encompassing different metamaterial types. An analytical model of the partition is derived by treating the metamaterial layers with effective material properties inferred from a homogenization method. By applying constraints on the metamaterial and partition properties, such as the overall mass and thickness of the partition, optimizations are then performed to maximize the sound transmission loss within a specific frequency band. A numerical model of the optimized partition is produced to validate the analytical model
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Published date: 10 July 2023
Venue - Dates:
10th Convention of the European Acoustics Association: Forum Acusticum 2023: acoustics for a green world, Politecnico di Torino, Torino, Italy, 2023-09-11 - 2023-09-15
Keywords:
Acoustic Metamaterials, Sound Insulation, Multi-layer Partition, Broadband Low Frequency
Identifiers
Local EPrints ID: 488158
URI: http://eprints.soton.ac.uk/id/eprint/488158
PURE UUID: fbc08f08-a78c-4162-9e51-219ee3ec15c2
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Date deposited: 17 Mar 2024 04:44
Last modified: 18 Mar 2024 04:05
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Contributors
Author:
Kenneth Leung
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