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    FMBEM analysis of sound scattering from a damping plate in the near field of a hydrophone.

    191022_72947_wilkes_fmbem_analysis_of_sound_2012.pdf (2.029Mb)
    Access Status
    Open access
    Authors
    Wilkes, Daniel
    Alexander, P.
    Duncan, Alexander
    Date
    2012
    Type
    Conference Paper
    
    Metadata
    Show full item record
    Citation
    Wilkes, Daniel and Alexander, Polly and Duncan, Alec. 2012. FMBEM analysis of sound scattering from a damping plate in the near field of a hydrophone, in McMinn, Terrance (ed), Acoustics 2012 Fremantle: Acoustics, Development and the Environment, The 2012 Conference of the Australian Acoustical Society, Nov 21-23 2012. Fremantle, Western Australia: Australian Acoustical Society
    Source Title
    Proceedings of the Acoustical Society of Australia
    Source Conference
    Acoustics 2012 Fremantle: Acoustics, Development and the Environment, the 2012 Conference of the Australian Acoustical Society
    Additional URLs
    http://www.acoustics.asn.au/conference_proceedings/AAS2012/papers/p70.pdf
    ISBN
    9780646590394
    URI
    http://hdl.handle.net/20.500.11937/33561
    Collection
    • Curtin Research Publications
    Abstract

    As part of research into the effect of underwater noise on the communication between an under-ice Autonomous Underwater Vehicle (AUV) and it’s stationary launch vessel (the Aurora Australis), fast multipole boundary element method (FMBEM) acoustic modeling was conducted. In particular, a steel damping plate with a complex 3-dimensional structure was modeled (using up to 1.6 x 10 5 boundary elements) and the effect of sound scattering from a pinger near the ship was determined at the receiver hydrophone, which was in close proximity to the damping plate. The direct incident field from the pinger was modeled as a plane wave at a number of incidence angles (to account for the depths to which the hydrophone was lowered) and over a range of frequencies up to the pinger frequency of 10kHz. This paper presents these results and discusses some of the interesting effects observed at the ‘non-unique’ frequencies when using the different methods available to provide stability to the numerical solution. Thus far, the modeling conducted for the damping plate has treated the object as rigid. The FMBEM code being developed at CMST now has the capability to model fully coupled fluid-structure interactions and some initial results from treating the damping plate as elastic are also presented.

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