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    Articulating parametric resonance for an OWC spar buoy in regular and irregular waves

    Giorgi, Giuseppe and Ringwood, John (2018) Articulating parametric resonance for an OWC spar buoy in regular and irregular waves. Journal of Ocean Engineering and Marine Energy, 4. pp. 311-322. ISSN 2198-6444

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    Wave energy devices are designed, and controlled, to be extremely responsive to incoming wave excitation, hence, maximising power absorption. Due to the consequent large motion excursions, highly nonlinear behaviour is likely to occur, especially in relation to variations in wetted surface. Moreover, nonlinearities may induce parametric instability, or activate internal mechanisms for exchanging energy between different degrees of freedom (DoFs), usually affecting the overall efficiency of the device. Consequently, single-DoF linear models may produce overly optimistic power production predictions, and neglect important dynamics of the system. One highly nonlinear phenomenon, potentially detrimental to power absorption for several wave energy converters, is parametric roll/pitch; due to parametric excitation, part of the energy flow is internally diverted, from the axis where the power take-off is installed, to a secondary axis, generating parasitic motion. This paper proposes a computationally efficient multi-DoF nonlinear model, which can effectively describe nonlinear behaviour, such as parametric pitch and roll, and their impact on motion prediction, power production assessment, and optimal control parameters.

    Item Type: Article
    Keywords: Parametric roll; Parametric resonance; Nonlinear Froude–Krylov force; Wave energy converters; Floating oscillating water column;
    Academic Unit: Faculty of Science and Engineering > Electronic Engineering
    Item ID: 13116
    Identification Number:
    Depositing User: Professor John Ringwood
    Date Deposited: 26 Jun 2020 22:13
    Journal or Publication Title: Journal of Ocean Engineering and Marine Energy
    Publisher: Springer
    Refereed: Yes
    Use Licence: This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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