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    A Compact 6-DoF Nonlinear Wave Energy Device Model for Power Assessment and Control Investigations


    Giorgi, Giuseppe and Ringwood, John (2019) A Compact 6-DoF Nonlinear Wave Energy Device Model for Power Assessment and Control Investigations. IEEE Transactions on Sustainable Energy, 10 (1). pp. 119-126. ISSN 1949-3029

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    Abstract

    High accuracy at a low computational time is likely to be a fundamental trait for mathematical models for wave energy converters, in order to be effective tools for reliable motion prediction and power production assessment, device and controller design, and loads estimation. Wave energy converters are particularly prone to exhibit complex and nonlinear behaviours, which are difficult to be modelled efficiently. Highlynonlinear effects, related to nonlinear Froude-Krylov forces, are nonlinear coupling, instability, and parametric resonance, which may damage or improve the power production. It is therefore fundamental to be able to describe such nonlinearities, in order to assess their repercussion on the performance of the device, and eventually design the system in order to exploit them. This paper provides a computationally efficient, compact, and flexible modelling approach for describing nonlinear Froude- Krylov forces for axisymmetric wave energy devices, in 6 degrees of freedom. Unlike other similar models, based on a mesh discretization of the geometry, the analytical formulation of the wetted surface allows the dynamical model to run almost in real time.

    Item Type: Article
    Additional Information: This is the postprint version of the published article, which is available at https://doi.org/10.1109/TSTE.2018.2826578
    Keywords: Nonlinear hydrodynamic model; parametric resonance; pitching/rolling instability; computationally efficient; wave energy converter;
    Academic Unit: Faculty of Science and Engineering > Electronic Engineering
    Faculty of Science and Engineering > Research Institutes > Centre for Ocean Energy Research
    Item ID: 12443
    Identification Number: https://doi.org/10.1109/TSTE.2018.2826578
    Depositing User: Professor John Ringwood
    Date Deposited: 11 Feb 2020 15:46
    Journal or Publication Title: IEEE Transactions on Sustainable Energy
    Publisher: Institute of Electrical and Electronics Engineers (IEEE)
    Refereed: Yes
    Funders: Science Foundation Ireland (SFI)
    URI:

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