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    Nonlinear Froude-Krylov force modelling for two heaving wave energy point absorbers


    Penalba Retes, Markel and Merigaud, Alexis and Gilloteaux, Jean-Christophe and Ringwood, John (2015) Nonlinear Froude-Krylov force modelling for two heaving wave energy point absorbers. Proceedings of the 11th European Wave and Tidal Energy Conference. ISSN 2309-1983

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    Abstract

    Most mathematical models used to assess the motions of wave-energy converters are linear, which may lead to significant errors as these devices can have a strongly-nonlinear behaviour. This paper investigates the effects of nonlinearities in the computation of Froude-Krylov forces, which play a major role in the dynamics of the motion of heaving energy pointabsorbers, with a focus on the influence of the device’s geometry. Results show that Froude-Krylov forces nonlinearities could be negligible when the device is uncontrolled. In contrast, they become significant when control is applied to maximise motions, especially for a device whose immersed cross-sectional area varies over time: in such a case latching control parameters based on a linear model can prove to be inefficient. Furthermore, although the latching control can be adapted to the nonlinear behaviour of the device by tuning parameters accordingly, the amount of power production assessed through the linear models does not seem to be achievable.

    Item Type: Article
    Keywords: Wave energy; boundary element method; excitation force; Froude-Krylov force; nonlinear modelling;
    Academic Unit: Faculty of Science and Engineering > Electronic Engineering
    Item ID: 6669
    Depositing User: Professor John Ringwood
    Date Deposited: 15 Dec 2015 12:11
    Journal or Publication Title: Proceedings of the 11th European Wave and Tidal Energy Conference
    Publisher: European Wave and Tidal Energy Conference 2015
    Refereed: Yes
    URI:

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