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    Moment-Matching-Based Input-Output Parametric Approximation for a Multi-DoF WEC Including Hydrodynamic Nonlinearities

    Faedo, Nicolás and Peña-Sanchez, Yerai and Giorgi, Giuseppe and Ringwood, John (2019) Moment-Matching-Based Input-Output Parametric Approximation for a Multi-DoF WEC Including Hydrodynamic Nonlinearities. European Tidal and Wave Energy Conference Proceedings (1449). ISSN 2706-6940

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    We present in this paper a moment-matching method to compute a parametric approximation of the inputoutput (force-to-motion) response of a multiple Degree of Freedom (DoF) Wave Energy Converter (WEC), based on the algorithm presented in [1]. This method allows the user to select a set of interpolation frequencies where the approximating model exactly matches the steady-state response of the target WEC under analysis, while being able to retain key underlying physical properties of the device. Furthermore, we show how to systematically accommodate nonlinear effects using this approximation method, depicting an efficient and versatile approach to compute a parametric representation for WEC design, control and estimation procedures. We illustrate the capabilities and characteristics of this method by means of a study case, using a CorPower-like (heaving point absorber) device. Our numerical analysis shows that, when compared to the currently most-used methodology to parameterise the dynamics of a multi-DoF WEC, the proposed approach can compute mathematical models with the same degree of accuracy and up to ≈ 50 % of improvement in terms of computational time.

    Item Type: Article
    Additional Information: Funding: This material is based upon works supported by Science Foundation Ireland under Grant no. 13/IA/1886.
    Keywords: wave energy; parametric models; force-tomotion; moment-matching; system identification; control;
    Academic Unit: Faculty of Science and Engineering > Electronic Engineering
    Faculty of Science and Engineering > Research Institutes > Centre for Ocean Energy Research
    Item ID: 14287
    Depositing User: Professor John Ringwood
    Date Deposited: 31 Mar 2021 14:36
    Journal or Publication Title: European Tidal and Wave Energy Conference Proceedings
    Publisher: EWTEC
    Refereed: Yes
    Funders: Science Foundation Ireland (SFI)
    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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