Modified acoustic black hole profile for improved fatigue performance
Modified acoustic black hole profile for improved fatigue performance
Acoustic black holes (ABHs) are realised via modifications to a structure that effectively reduce the structural wave speed; this increases the effect of damping treatments and thus enhances the achievable vibration attenuation. ABHs are commonly designed using a tapering thickness profile and this leads to part of the ABH being very thin. Due to the focusing effect of the ABH, the thin section of the taper is also exposed to high amplitude vibrations and this raises concerns relating the vibration fatigue of the structure. This paper investigates the fatigue life of an ABH taper used to terminate a beam using a numerical model, before a modified taper profile is proposed that aims to reduce the fatigue, while maintaining ABH performance. The effect of the power law used in the taper profile on the fatigue life is investigated and the potential trade-off between performance and fatigue life is explored for both the unmodified and modified profiles.
Keys, Archie
be052521-bf0f-40c7-8e30-50deba927618
Cheer, Jordan
8e452f50-4c7d-4d4e-913a-34015e99b9dc
21 August 2022
Keys, Archie
be052521-bf0f-40c7-8e30-50deba927618
Cheer, Jordan
8e452f50-4c7d-4d4e-913a-34015e99b9dc
Keys, Archie and Cheer, Jordan
(2022)
Modified acoustic black hole profile for improved fatigue performance.
In Proceedings of InterNoise 2022.
10 pp
.
Record type:
Conference or Workshop Item
(Paper)
Abstract
Acoustic black holes (ABHs) are realised via modifications to a structure that effectively reduce the structural wave speed; this increases the effect of damping treatments and thus enhances the achievable vibration attenuation. ABHs are commonly designed using a tapering thickness profile and this leads to part of the ABH being very thin. Due to the focusing effect of the ABH, the thin section of the taper is also exposed to high amplitude vibrations and this raises concerns relating the vibration fatigue of the structure. This paper investigates the fatigue life of an ABH taper used to terminate a beam using a numerical model, before a modified taper profile is proposed that aims to reduce the fatigue, while maintaining ABH performance. The effect of the power law used in the taper profile on the fatigue life is investigated and the potential trade-off between performance and fatigue life is explored for both the unmodified and modified profiles.
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Modified acoustic black hole profile for improved fatigue performance - Archie Keys
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Published date: 21 August 2022
Venue - Dates:
Inter Noise 2022, Scottish Event Campus, Glasgow, United Kingdom, 2022-08-21 - 2022-08-24
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Local EPrints ID: 470772
URI: http://eprints.soton.ac.uk/id/eprint/470772
PURE UUID: 56b81e12-e749-48b0-a98c-96e6b9d7046c
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Date deposited: 19 Oct 2022 17:06
Last modified: 17 Mar 2024 03:23
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Author:
Archie Keys
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