Sound Scattering by an Elastic Spherical Shell and its Cancellation using a Multi-pole Approach

• Autorzy: Avital E. J. , Bholah N. D. , Giovanelli G. C. , Miloh T.

Identyfikatory

DOI

10.1515/aoa-2017-0072

• Języki publikacji: EN

Abstrakty

EN

The scattering and transmission of sound by an elastic spherical shell is considered when it is subject to an incoming monochromatic planar wave. It is aimed to cancel the sound scattering using combinations of multi-pole sources located at the centre of a shell filled with compressible fluid. Assuming linear acoustics and structural dynamics, exact solutions are derived for total elimination of the sound scattering for three cases: a free-space, near a hard ground or near a free-surface, where in the last two cases it is assumed that the incoming wave propagates normal to the interface to maximize sound reflection back unto the source of the incoming wave. An elastic spherical shell of 1 m radius embedded in water and filled with air or oil is analysed to show the dominance of low-mode numbers for frequencies of less than 10 kHz and thus demonstrate the ability of this approach to damp acoustic scattering by means of low-order multi-poles inside the shell. Contour and mode distribution plots are also given and analysed.

Słowa kluczowe

EN

sound scattering; structural dynamics; sound cancellation

• Wydawca: Instytut Podstawowych Problemów Techniki PAN ; Komitet Akustyki PAN ; Polskie Towarzystwo Akustyczne
• Czasopismo: Archives of Acoustics
• Rocznik: 2017
• Tom: Vol. 42, No. 4
• Strony: 697--705
• Opis fizyczny: Bibliogr. 14 poz., wykr.

Twórcy

autor

Avital E. J.

• School of Engineering and Materials Science, Queen Mary University of London, 327 Mile End Road London E1 4NS UK

autor

Bholah N. D.

• School of Engineering and Materials Science, Queen Mary University of London, 327 Mile End Road London E1 4NS UK

autor

Giovanelli G. C.

• Escoda Politecnica, Federal University of Rio de Janeiro, Brazil

autor

Miloh T.

• School of Engineering, Tel Aviv University, Ramat Aviv Israel

Bibliografia

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• 9. Kim D., Avital E. J., Miloh T. (2014), Sound scattering and its reduction by a Janus sphere type, Advances in Acoustics and Vibration, 2014, Article ID 392138, doi: 10.1155/2014/392138.
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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).