A parametric study and modal analysis of an acoustic black hole on a beam
A parametric study and modal analysis of an acoustic black hole on a beam
Acoustic black holes are structural features that have a varying thickness profile, and provide a potential lightweight damping solution for flexural vibrations. In practical applications, the length of an acoustic black hole will be constrained by the available space and the minimum tip height will be limited by both the manufacturing capabilities and strength requirements. Therefore, the power law of the taper is often the critical design parameter. In this paper, a parametric study of an acoustic black hole termination on a beam is presented with practical constraints on the length and tip height. The reflection coefficient of the acoustic black hole has been calculated for a range of power laws and it has been shown that, for a fixed power law, the reflection coefficient varies over frequency and exhibits bands of high and low reflection. These bands can be related to modes of the acoustic black hole. In addition, it has been found that an optimum power law exists for minimising the broadband average reflection coefficient for each acoustic black hole configuration.
Hook, Kristian
6c9b8a1f-84fe-4560-9138-89cf5e8f4c4b
Cheer, Jordan
8e452f50-4c7d-4d4e-913a-34015e99b9dc
Daley, Stephen
53cef7f1-77fa-4a4c-9745-b6a0ba4f42e6
17 September 2018
Hook, Kristian
6c9b8a1f-84fe-4560-9138-89cf5e8f4c4b
Cheer, Jordan
8e452f50-4c7d-4d4e-913a-34015e99b9dc
Daley, Stephen
53cef7f1-77fa-4a4c-9745-b6a0ba4f42e6
Hook, Kristian, Cheer, Jordan and Daley, Stephen
(2018)
A parametric study and modal analysis of an acoustic black hole on a beam.
International Conference on Noise & Vibration Engineering (ISMA) 2018, , Leuven, Belgium.
17 - 19 Sep 2018.
10 pp
.
Record type:
Conference or Workshop Item
(Paper)
Abstract
Acoustic black holes are structural features that have a varying thickness profile, and provide a potential lightweight damping solution for flexural vibrations. In practical applications, the length of an acoustic black hole will be constrained by the available space and the minimum tip height will be limited by both the manufacturing capabilities and strength requirements. Therefore, the power law of the taper is often the critical design parameter. In this paper, a parametric study of an acoustic black hole termination on a beam is presented with practical constraints on the length and tip height. The reflection coefficient of the acoustic black hole has been calculated for a range of power laws and it has been shown that, for a fixed power law, the reflection coefficient varies over frequency and exhibits bands of high and low reflection. These bands can be related to modes of the acoustic black hole. In addition, it has been found that an optimum power law exists for minimising the broadband average reflection coefficient for each acoustic black hole configuration.
Text
ISMA_HOOK2018
- Accepted Manuscript
More information
Published date: 17 September 2018
Venue - Dates:
International Conference on Noise & Vibration Engineering (ISMA) 2018, , Leuven, Belgium, 2018-09-17 - 2018-09-19
Identifiers
Local EPrints ID: 424187
URI: http://eprints.soton.ac.uk/id/eprint/424187
PURE UUID: 1b259683-8137-4ad6-9d43-54e0fc23cacf
Catalogue record
Date deposited: 05 Oct 2018 11:34
Last modified: 23 Apr 2024 18:40
Export record
Contributors
Author:
Kristian Hook
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