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Acoustic black hole manufacturing for practical applications and the effect of geometrical and material imperfections

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conference contribution
posted on 17.10.2016, 12:31 by E.P. Bowyer, Victor V. Krylov
One of the main challenges in NVH engineering today is not only finding effective methods of reducing noise and vibration from structures, but also the integration of these new methods into a manufacturing process. Acoustic black holes reduce amplitudes of resonant flexural vibrations by reducing edge reflections from structures’ free edges via the use of wedges of power-law profile (one dimensional acoustic black holes) or tapered circular indentations of power-law profile (two-dimensional acoustic black holes). Such acoustic black holes can absorb a large proportion of the incident flexural wave energy. In this paper, the manufacturing of acoustic black holes for some practical applications is considered. The effect of geometrical and material imperfections associated with manufacturing on the performance of acoustic black holes is also investigated experimentally. These imperfections are: tip length and corrugations, edge truncations, etc. Also, the effects of commonly used joining techniques are considered. The reported results demonstrate that the effect of geometrical and material imperfections is not detrimental for the performance of the acoustic black holes. In spite of the presence of imperfections, they provide an effective damping of flexural vibrations, as well as an effective reduction of sound radiation from vibrating structures.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

45th International Congress and Exposition on Noise Control Engineering, "Inter-Noise 2016" Proceedings of the Inter-Noise 2016

Pages

2411 - 2421

Citation

BOWYER, E.P. and KRYLOV, V.V., 2016. Acoustic black hole manufacturing for practical applications and the effect of geometrical and material imperfections.IN: Kropp, W., von Estorff, O. and Schulte-Fortkamp, B. (eds.) Proceedings of the 45th International Congress on Noise Control Engineering: Towards a Quieter Future (Internoise 2016), Hamburg, Germany, Aug 21-24th. pp. 2411-2421.

Publisher

German Acoustical Society (DEGA)

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Acceptance date

15/07/2016

Publication date

2016

Notes

This conference paper is available here with kind permission of the publisher.

ISBN

978-3-939296-11-9

ISSN

0105-175X

Language

en

Location

Hamburg, Germany

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