Design of monopiles for multi-megawatt wind turbines at 50 m water depth

Wilfried Njomo Wandji, Anand Natarajan, Nikolay Krasimirov Dimitrov, Thomas Buhl

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    Abstract

    The design of a monopile substructure for wind turbines of 10 MW capacity installed at 50 m water depth is presented. The design process starts with the design of a monopile at a moderate water depth of 26 m and is then up scaled to a 50 m water depth. The baseline geometry is then modified to specific frequency constraints for the support structure. The specific design requirements including the soil boundary conditions of this large diameter monopile has been described and fully coupled hydro-aero-servo elastic simulations are performed for ultimate limit state design. Soil plasticization is also considered. Analyses have shown that the design of large diameter monopile is not a straightforward extrapolation process, but it requires specific checks and iterations. An appropriate design scheme is proposed with perturbation analysis for robustness.
    Original languageEnglish
    Title of host publicationEuropean Wind Energy Association Annual Conference and Exhibition 2015, EWEA 2015 - Scientific Proceedings
    PublisherEuropean Wind Energy Association (EWEA)
    Publication date2015
    Pages8-12
    ISBN (Print)9782930670003
    Publication statusPublished - 2015
    EventEWEA Annual Conference and Exhibition 2015 - Paris, France
    Duration: 17 Nov 201520 Nov 2015

    Conference

    ConferenceEWEA Annual Conference and Exhibition 2015
    Country/TerritoryFrance
    CityParis
    Period17/11/201520/11/2015

    Keywords

    • Multi-megawatt wind turbines
    • Large diameter monopile
    • Deep water
    • Ultimate design

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