On the fatigue behavior of support structures for offshore wind turbines

Alati, Natale; Nava, Vincenzo; Failla, Giuseppe; Arena, Felice; Santini, Adolfo

doi:10.12989/was.2014.18.2.117

Cited by 21 publications

(9 citation statements)

References 16 publications

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“…This paper investigates the FL of a 5‐MW wind turbine model with properties provided by the US National Renewable Energy Laboratory (NREL) . Various studies have been based on this wind turbine as a significant amount of data is available for it . In this study, different software packages were used for the fatigue analysis, as shown in Figure .…”

Section: Methodsmentioning

confidence: 99%

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Scour influence on the fatigue life of operational monopile‐supported offshore wind turbines

Rezaei¹,

Duffour²,

Fromme³

2018

Wind Energy

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Offshore wind turbines supported on monopiles are an important source for renewable energy. Their fatigue life is governed by the environmental loads and in the dynamic behavior, depending on the support stiffness and thus soil‐structure interaction. The effects of scour on the short‐term and long‐term responses of the NREL 5‐MW wind turbine under operational conditions have been analyzed by using a finite element beam model with Winkler springs to model soil‐structure interaction. It was found that due to scour, the modal properties of the wind turbine do not change significantly. However, the maximum bending moment in the monopile increases, leading to a significant reduction in fatigue life. Backfilling the scour hole can recover the fatigue life, depending mostly on the depth after backfilling. An approximate fatigue analysis method is proposed, based on the full time‐domain analysis for 1 scour depth, predicting with good accuracy the fatigue life for different scour depths from the quasi‐static changes in the bending moment.

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Section: Methodsmentioning

confidence: 99%

“…30 Various studies have been based on this wind turbine as a significant amount of data is available for it. [31][32][33][34][35][36][37] In this study, different software packages were used for the fatigue analysis, as shown in Figure 1. The preprocessing module TurbSim was used to model the turbulent incoming wind field as an input to FAST.…”

mentioning

confidence: 99%

Scour influence on the fatigue life of operational monopile‐supported offshore wind turbines

Rezaei¹,

Duffour²,

Fromme³

2018

Wind Energy

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“…Finally, structures offshore are subjected with dynamic loadings which results in damage due to fatigue. Alati et al [28] evaluated the fatigue behavior of two offshore wind foundations in the time domain and estimated the respective lifetime damage equivalent load.…”

Section: Introductionmentioning

confidence: 99%

Soil Interaction and Grout Behavior for the NREL Reference Monopile Offshore Wind Turbine

Vieira¹,

Viana²,

Henriques

et al. 2020

JMSE

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Monopiles for offshore wind are the most used foundations by farm operators due to their low production costs, when compared to other bottom-fixed or floating foundations. In this research, a monopile foundation for offshore wind power was evaluated for its soil interaction and grout behavior, and an appropriate numerical model for the structural analysis of the foundation and tower was developed. FAST 8, an aero-hydro-servo-elastic numerical code developed by NREL, was used to obtain the loads applied on the supporting structures. These loads were pre-processed before they were inputted on the finite element model, developed using the finite element software ANSYS. The considered conical grout connection, which connects the monopile to the transition piece through friction, was modeled under a changing-status nonlinearity condition. To model the soil–pile interaction, a p-y model was applied using the ANSYS APDL commands. Static, modal, and transient structural analyses were produced to study the structure suitability for its use on offshore environments. Different soil interactions were modeled, and their results were then compared within the transient and modal analysis, indicating that the angle of the grout connection strongly affects the loading conditions on the grout. Moreover, scouring affects the dynamic behavior of the overall supporting structures, thus protection against this phenomenon is suggested.

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“…In fact, while aerodynamic loads on the rotor are to be derived from aeroelastic models, considering the complex interaction between air flow and rotor blades, the influence of control systems and support structure dynamics, the latter affects the calculation of the hydrodynamic loads. Hence, although in some cases and especially in the early stages of design, simplified analyses are implemented with responses to wind and wave loads computed separately and next superposed [18,19], only fully integrated time-domain simulations are currently recommended as the basis of final, detailed wind turbine design calculations, owing to the role played by system nonlinearities inherent to rotor aerodynamics, hydrodynamics and control systems [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

New perspectives in offshore wind energy

Failla

Arena

2015

Phil. Trans. R. Soc. A.

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The design of offshore wind turbines is one of the most fascinating challenges in renewable energy. Meeting the objective of increasing power production with reduced installation and maintenance costs requires a multi-disciplinary approach, bringing together expertise in different fields of engineering. The purpose of this theme issue is to offer a broad perspective on some crucial aspects of offshore wind turbines design, discussing the state of the art and presenting recent theoretical and experimental studies.

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On the fatigue behavior of support structures for offshore wind turbines

Cited by 21 publications

References 16 publications

Scour influence on the fatigue life of operational monopile‐supported offshore wind turbines

Scour influence on the fatigue life of operational monopile‐supported offshore wind turbines

Soil Interaction and Grout Behavior for the NREL Reference Monopile Offshore Wind Turbine

New perspectives in offshore wind energy

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