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Minimisation of the reflection coefficient in a beam using an active acoustic black hole

Minimisation of the reflection coefficient in a beam using an active acoustic black hole
Minimisation of the reflection coefficient in a beam using an active acoustic black hole
Acoustic black holes (ABHs) are commonly realised as structural features that can be used for effective lightweight damping. Passive damping material can be added to the taper to enhance the performance. This paper presents an experimental investigation into a hybrid damping solution consisting of an ABH on one end of a beam with a piezoelectric patch attached to the taper. A wave-based control strategy is presented in which the reflected wave was used as the error signal and, therefore, the reflection from the termination was minimised. In order to assess the performance of an active ABH, wave-based active control was also performed on a beam without an ABH termination. In each control case, the plant model error was equal and the control filter was limited to a practical length. Additionally, the maximum peak-to-peak voltage of the control signal was constrained to be within operating limitations. Wave-based active vibration control was then performed in real-time and the results show that the reflection coefficient was successfully controlled in both cases. It is shown that when the AABH was used, a greater attenuation in the reflection coefficient was achieved at lower frequencies and, furthermore, the active ABH required a lower control effort.
acoustic black holes, active control, feedforward, reflection coefficient
1-8
Hook, Kristian
6c9b8a1f-84fe-4560-9138-89cf5e8f4c4b
Cheer, Jordan
8e452f50-4c7d-4d4e-913a-34015e99b9dc
Daley, Stephen
53cef7f1-77fa-4a4c-9745-b6a0ba4f42e6
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 (2020) Minimisation of the reflection coefficient in a beam using an active acoustic black hole. Inter-Noise 2020, Online. 23 - 26 Aug 2020. pp. 1-8 .

Record type: Conference or Workshop Item (Paper)

Abstract

Acoustic black holes (ABHs) are commonly realised as structural features that can be used for effective lightweight damping. Passive damping material can be added to the taper to enhance the performance. This paper presents an experimental investigation into a hybrid damping solution consisting of an ABH on one end of a beam with a piezoelectric patch attached to the taper. A wave-based control strategy is presented in which the reflected wave was used as the error signal and, therefore, the reflection from the termination was minimised. In order to assess the performance of an active ABH, wave-based active control was also performed on a beam without an ABH termination. In each control case, the plant model error was equal and the control filter was limited to a practical length. Additionally, the maximum peak-to-peak voltage of the control signal was constrained to be within operating limitations. Wave-based active vibration control was then performed in real-time and the results show that the reflection coefficient was successfully controlled in both cases. It is shown that when the AABH was used, a greater attenuation in the reflection coefficient was achieved at lower frequencies and, furthermore, the active ABH required a lower control effort.

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Published date: 23 August 2020
Venue - Dates: Inter-Noise 2020, Online, 2020-08-23 - 2020-08-26
Keywords: acoustic black holes, active control, feedforward, reflection coefficient

Identifiers

Local EPrints ID: 443479
URI: http://eprints.soton.ac.uk/id/eprint/443479
PURE UUID: a5b8a757-44dc-4807-bd0f-888886211968
ORCID for Kristian Hook: ORCID iD orcid.org/0000-0002-5011-0414
ORCID for Jordan Cheer: ORCID iD orcid.org/0000-0002-0552-5506

Catalogue record

Date deposited: 26 Aug 2020 16:36
Last modified: 10 Apr 2024 01:45

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Contributors

Author: Kristian Hook ORCID iD
Author: Jordan Cheer ORCID iD
Author: Stephen Daley

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