Contribution of fluid viscous dampers on fatigue life of lattice-type offshore wind turbines

2022 ◽  
Vol 245 ◽  
pp. 110506
Author(s):  
Marzieh Emami ◽  
Reza Dezvareh ◽  
Seyed Amin Mousavi
2016 ◽  
pp. 742-747 ◽  
Author(s):  
W. Weijtjens ◽  
N. Noppe ◽  
T. Verbelen ◽  
C. Devriendt ◽  
A. Iliopoulos

2015 ◽  
Author(s):  
WOUT WEIJTJENS ◽  
NYMFA NOPPE ◽  
ALEXANDROS ILIOPOULOS ◽  
CHRISTOF DEVRIENDT

2018 ◽  
Vol 123 ◽  
pp. 450-459 ◽  
Author(s):  
Ramtin Rezaei ◽  
Paul Fromme ◽  
Philippe Duffour

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Bing Li ◽  
Kang Rong ◽  
Haifeng Cheng ◽  
Yongxin Wu

The vibration of offshore wind turbines caused by external loads is significant, which will cause fatigue damage to offshore wind turbines. Wind load is the main load during the operation period of the wind turbine, and available studies have shown that the external wind field often exhibits certain non-Gaussian characteristics. This article aims to obtain the fatigue assessment of the monopile foundation of the wind turbine under the non-Gaussian wind fields. A 5 MW wind turbine is selected in this article, and OpenFAST is applied to simulate the wind load. By comparing the Mises stress time histories of the pile foundation at a different depth, the fatigue analysis of the critical spots of the pile foundation is obtained. In the analysis of fatigue damage, the rain flow counting method is adopted, and the two-segment S-N curve is selected to analyze the fatigue life of the critical spots. The results show that, by taking the non-Gaussian characteristic of the wind field into account, the fatigue life of the monopile foundation decreases. Therefore, attention should be paid to the influence of non-Gaussian characteristics of wind fields on the fatigue life of monopile-supported wind turbines.


Author(s):  
Bjo̸rn Skaare ◽  
Tor David Hanson ◽  
Finn Gunnar Nielsen

Exploitation of wind energy at deep-waters locations requires floating wind turbine foundations. Several floating wind turbine foundation concepts are reported in the literature, and a common challenge is to make a low cost foundation with acceptable motion characteristics. In order to analyze the fatigue life of floating offshore wind turbines, the coupled action of wind, waves, current and blade pitch control strategy must be considered. State-of-the-art computer programs for motion analysis of moored offshore bodies, Simo-Riflex from Sintef Marintek, are coupled to a state-of-the-art aero-elastic computer program for wind turbines, Hawc2 from Riso̸ National Laboratory. The wave loads on the body may include wave diffraction and radiation loads as well as viscous forces. The mooring lines are modelled using cable finite elements with inertia and drag forces. The wind load on the rotor is based on common rotor aerodynamics including corrections for skew inflow and relative motion caused by large displacement and large tilt and yaw rotations of the rotor. Conventional wind turbine control strategies lead to wind-induced loads that may amplify or damp the motions of the floating wind turbine. The first case is a result of the blade pitch control strategy above rated wind speed for the wind turbine, and can result in large resonant motions that will reduce the fatigue life of the floating wind turbine significantly. The latter case implies energy extraction from the waves. This paper addresses the importance of control strategies on fatigue life for a given floating offshore wind turbine. A fatigue life time comparison between a conventional blade pitch control strategy and an estimator based blade pitch control strategy show that the fatigue life of floating offshore wind turbines can be significantly increased by use of alternative blade pitch control strategies.


2021 ◽  
Author(s):  
Elize Petrovska ◽  
Jean-Baptiste Le Dreff ◽  
Philipp Thies ◽  
Selda Oterkus ◽  
Edward Mccarthy

Wind Energy ◽  
2018 ◽  
Vol 21 (9) ◽  
pp. 683-696 ◽  
Author(s):  
Ramtin Rezaei ◽  
Philippe Duffour ◽  
Paul Fromme

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