The finite element method in underwater acoustics

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


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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.

Item Type: Thesis (Doctoral)
Additional Information: In 2 volumes
Subjects: T Technology > TC Hydraulic engineering. Ocean engineering
Q Science > QA Mathematics > QA76 Computer software
Divisions : University Structure - Pre August 2011 > Institute of Sound and Vibration Research
ePrint ID: 52298
Accepted Date and Publication Date:
1986Made publicly available
Date Deposited: 26 Aug 2008
Last Modified: 27 Mar 2014 18:35

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