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The finite element method in underwater acoustics

Record type: Thesis (Doctoral)

A Finite Element Method (FEM) is developed to calculate rotationally symmetric acoustic propagation over short range intervals (0-5 km) in shallow oceans (0-200 m deep) at low frequencies (0-50 Hz). The method allows full two-way wave propagation in range dependent environments and includes coupling to a full elastic seabed. Numerical results from a computer program are presented for propagation upslope, downslope, over seamounts and across trenches in the seabed. The seabed is modelled as a pressure release surface, a fluid halfspace and an elastic, solid halfspace and the implications of each type of model are discussed. The halfspaces, being represented by a new set of infinite elements, are modelled without truncation. The results are presented primarily as plots of transmission loss against range for a fixed depth receiver. Subsidiary results show the effect of depth averaging the receiver location, and extract mode amplitude data to reveal the strength of mode coupling and backscatter in different environments.

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Citation

Pack, Peter Michael Walter (1986) The finite element method in underwater acoustics University of Southampton, Institute of Sound and Vibration Research, Doctoral Thesis , 537pp.

More information

Published date: 1986
Additional Information: In 2 volumes
Organisations: University of Southampton

Identifiers

Local EPrints ID: 52298
URI: http://eprints.soton.ac.uk/id/eprint/52298
PURE UUID: 007e9dbe-8d6e-49eb-97c1-b3f1d8b83ef4

Catalogue record

Date deposited: 26 Aug 2008
Last modified: 17 Jul 2017 14:42

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Contributors

Author: Peter Michael Walter Pack
Thesis advisor: M.J. Fisher

University divisions


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