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Neutral inclusions for diffusive acoustic fields
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0003-2749-8008
2017 (English)In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, Vol. 295, 80-89 p.Article in journal (Refereed) Published
Abstract [en]

We predict scattering cancellation in diffusive transport of acoustics waves propagating through multiple scattering media in the stationary limit. This would enable sensing of diffusive sound without disrupting the exterior acoustic field. We present design schemes for making spherical or cylindrical core-shell structures with multiple layers, characterized by homogenous and isotropic diffusion coefficients, neutral to an arbitrary applied multipole field. The double-layered sphere is found to support transparency to two concurrent multipole fields and unique cloaking solutions of arbitrary multipole order. One extra degree of freedom is provided by every layer added to the core-shell structure which may be exploited with our iterative formula for effective diffusivity for cloaking of additional field terms. From this we pass over to the long wavelength limit of ballistic sound and provide formulas for effective mass densities of multi-layered structures in spherical and cylindrical geometries with respect to multipole pressure fields. (C) 2017 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD , 2017. Vol. 295, 80-89 p.
Keyword [en]
Diffusive sound; Neutral inclusion; Multilayered structures; Cloaking; Multipole fields
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:liu:diva-136562DOI: 10.1016/j.jsv.2017.02.025ISI: 000396973700005OAI: oai:DiVA.org:liu-136562DiVA: diva2:1090315
Available from: 2017-04-24 Created: 2017-04-24 Last updated: 2017-04-24

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Kroon, LarsJärrendahl, Kenneth
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