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Acoustic black holes and their applications for vibration damping and sound absorption

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conference contribution
posted on 24.09.2012, 09:56 by Victor V. Krylov
During the last decade, new interesting physical objects have been invented and investigated - ‘acoustic black holes’, whereby it is possible to achieve almost 100% absorption of the incident wave energy. The main principle of the ‘acoustic black hole effect’ is based on a gradual power-law-type decrease in velocity of the incident wave with propagation distance, linear or faster, to almost zero, which should be accompanied by efficient energy absorption in the area of low velocity via inserted highly absorbing materials. So far, this effect has been investigated mainly for flexural waves in thin plates for which the required gradual reduction in wave velocity with distance can be easily achieved by changing the plate local thickness according to a power law, with the power-law exponent being equal or larger than two. The present paper provides a brief review of the theory of acoustic black holes, including their comparison with ‘optic black holes’ invented about three years ago. It is shown in particular that optic black holes are based on the same principle that governs the behaviour of acoustic black holes. Review is also given of the recent, mainly experimental, work carried out at Loughborough University on damping structural vibrations based on the acoustic black hole effect. This is followed by the discussion on potential applications of the acoustic black hole effect for sound absorption in air.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Citation

KRYLOV, V.V., 2012. Acoustic black holes and their applications for vibration damping and sound absorption. IN: Sas, P., Moens, D. and Jonckheer, S. (eds.). Proceedings of the International Conference on Noise and Vibration Engineering (ISMA 2012), Leuven, Belgium, 17-19 September, pp.933-944.

Publisher

KU Leuven

Version

VoR (Version of Record)

Publication date

2012

Notes

This conference paper was presented at the ISMA37 Conference (17-19 September 2012).

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Language

en

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