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Neutrally buoyant band gap design for underwater applications

Neutrally buoyant band gap design for underwater applications
Neutrally buoyant band gap design for underwater applications
Abstract — A locally resonant sonic material (LRSM) design is considered in two dimensions (2D) for obtaining a neutrally buoyant band gap material in underwater applications. The material is intended to have an overall effective mass density the same as that of water, and to produce bandgaps in the 10kHz region. The design problem is more constrained than a standard LRSM design scenario, in that necessitating an overall desired effective density requires a specific combination of material and geometrical properties, whilst also giving the required bandgap performance using only material properties and dimensions likely to be achievable in practice. A design is described featuring a proposed soft rubber-type layer encasing a Lucite core within a Lucite matrix with has an overall material thickness of 90mm. A -20dB band stop in the transmission coefficient magnitude over approximately the 8-12kHz range is achieved. Results are obtained by simulating the system using AFiDS, a staggered grid Finite Difference Time Domain (FDTD) simulator.
9781424413843
2079-2082
Institute of Electrical and Electronics Engineers
Fox, P.D.
44b69fce-cc5c-45c5-9660-7e3d3334799a
Fox, P.D.
44b69fce-cc5c-45c5-9660-7e3d3334799a

Fox, P.D. (2007) Neutrally buoyant band gap design for underwater applications. In Proceedings of IEEE Ultrasonics Symposium, 2007. Institute of Electrical and Electronics Engineers. pp. 2079-2082 . (doi:10.1109/ULTSYM.2007.523).

Record type: Conference or Workshop Item (Paper)

Abstract

Abstract — A locally resonant sonic material (LRSM) design is considered in two dimensions (2D) for obtaining a neutrally buoyant band gap material in underwater applications. The material is intended to have an overall effective mass density the same as that of water, and to produce bandgaps in the 10kHz region. The design problem is more constrained than a standard LRSM design scenario, in that necessitating an overall desired effective density requires a specific combination of material and geometrical properties, whilst also giving the required bandgap performance using only material properties and dimensions likely to be achievable in practice. A design is described featuring a proposed soft rubber-type layer encasing a Lucite core within a Lucite matrix with has an overall material thickness of 90mm. A -20dB band stop in the transmission coefficient magnitude over approximately the 8-12kHz range is achieved. Results are obtained by simulating the system using AFiDS, a staggered grid Finite Difference Time Domain (FDTD) simulator.

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Published date: 2007
Venue - Dates: IEEE International Ultrasonics Symposium, 2007-10-28 - 2007-10-31

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Local EPrints ID: 50490
URI: https://eprints.soton.ac.uk/id/eprint/50490
ISBN: 9781424413843
PURE UUID: 94ccd8c8-b202-4dd9-84c9-32ae734724f1

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Date deposited: 27 Feb 2008
Last modified: 13 Mar 2019 20:51

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Author: P.D. Fox

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