Strength analysis of a large-size supporting structure for an offshore wind turbine

Niklas, K.

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Tytuł artykułu

Strength analysis of a large-size supporting structure for an offshore wind turbine

Autorzy

Niklas K.

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The offshore wind power industry is the branch of electric energy production from renewable sources which is most intensively developed in EU countries. At present, there is a tendency to install larger-power wind turbines at larger distances from the seashore, on relatively deep waters. Consequently, technological solutions for new supporting structures intended for deeper water regions are undergoing rapid development now. Various design types are proposed and analysed, starting from gravitational supports (GBS), through monopiles and 3D frame structures (jackets, tripods), and ending with floating and submerged supports anchored to the seabed by flexible connectors, including TLP type solutions. The article presents the results of examination of an untypical large-size gravitational support intended for waters with the depth of up to 40 m. Firstly, a general concept of the new design is presented, while the next basic part of the article describes the support design in detail and provides its strength analysis. The examined support has the form of a large steel container consisting of conical segments. The strength analysis was conducted using the finite element method (FEM), in accordance with the standard DNVGL-ST-0126. Modifications introduced to the most heavily loaded structural node of the support, which was the set of base bottom trusses, is also included. The results of the performed analysis prove that the presented concept of supporting structure for a 7MW turbine meets fundamental strength criteria. The nonlinear buckling analysis was performed to evaluate the critical force acting on the support, which turned out to be 1.44 times as large as the maximum load of the wind turbine. Potentially important issues for further analyses have been identified as those resulting from the asymmetry of basic loads acting on the support.

Słowa kluczowe

renewable energy sources offshore wind power industry supporting structure strength analysis FEM computer simulation numerical calculations CFD conceptual design buckling thin-walled structure

Wydawca

Gdańsk University of Technology, Faculty of Ocean Engineering & Ship Technology

Czasopismo

Polish Maritime Research

Rocznik

2017

Tom

S 1

Strony

156--165

Opis fizyczny

Bibliogr. 50 poz., rys., tab.

Twórcy

autor

Niklas K.

Gdańsk University of Technology 11/12 Narutowicza St. 80 - 233 Gdańsk Poland

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Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017)

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Bibliografia

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