Simplified fatigue load assessment in offshore wind turbine structural analysis

Wind Energy ◽  
2015 ◽  
Vol 19 (2) ◽  
pp. 265-278 ◽  
Author(s):  
Daniel Zwick ◽  
Michael Muskulus
Keyword(s):  
Structural Analysis ◽  
Wind Turbine ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Fatigue Load

Loading and Structural Analysis of the Self-Aligning HyStOH Floating Wind Turbine Concept

2019 ◽  
Author(s):  
Andreas Manjock ◽  
Markus S. Starr
Keyword(s):  
Structural Analysis ◽  
Wind Turbine ◽  
The Self ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Structure Representation ◽  
Flexible Support ◽  
Analysis Methodology ◽  
Elastic Load ◽  
Load Simulation

Abstract This paper summarizes the results of the implementation and verification of a hydro-aero-servo-elastic load simulation model for a self-aligning floating offshore wind turbine (FOWT) combined with a structural analysis methodology of this FOWT structure. The main focus is a comparison of a rigid and a flexible support structure representation in the load simulation. This investigation is part of the multiparty project for the ‘Hydrodynamic and Structural Optimization of a Semi-submersible Offshore Wind Turbine’ (HyStOH), joining partners from science and industry and financially supported by the German Ministry of Economics Affairs and Energy, BMWi (Bundesministerium für Wirtschaft und Energie).

Analysis of Fatigue Damage for Offshore Wind Turbine Substructure

2013 ◽  
Vol 454 ◽  
pp. 7-14
Author(s):  
Bin Wang ◽  
Ying Li ◽  
Jin Ping Luo ◽  
Dan Shan Wang ◽  
Sheng Xiao Zhao
Keyword(s):  
Wind Turbine ◽  
Fatigue Damage ◽  
Probability Distributions ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Wave Direction ◽  
Wave Load ◽  
Fatigue Load ◽  
Linear Superposition ◽  
Loading Direction

Based on the probability distributions of wind direction and wave direction, the fatigue load is applied to the offshore wind turbine structure according to the actual environmental loading direction. The deterministic fatigue damage due to the wind load and the spectrum fatigue damage due to the wave load are calculated, respectively. Then, the total fatigue damage of the offshore wind turbine structure is obtained by the linear superposition. Compared with the results that the fatigue damage of the offshore wind turbine structure is computed under fatigue loads exerted in single direction, the results of omnidirectional fatigue analysis are more reasonable.

Fatigue Analysis of a 12-MW Wind Turbine Blade

2018 ◽  
Author(s):  
Hyeonjeong Ahn ◽  
Hyunkyoung Shin
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Turbine Blades ◽  
Fatigue Analysis ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Fatigue Load ◽  
Wind Turbine Blades ◽  
Design Life ◽  
Large Wind

In 2017, the MHI Vestas released a 9.5-MW offshore wind turbine. It is also actively researching and developing a 10-MW offshore wind turbine. As the capacity of a wind turbine increases, the sizes of all its system components, including length and weight, correspondingly increase. Consequently, as a wind turbine becomes larger, it becomes necessary to analyze the fatigue load applied to its entire system. The first reason for such an analysis is to achieve a safe but not overly designed large wind turbine. Second, most wind turbine accidents involve aging turbines and are related to fatigue analysis. Accordingly, the purpose of fatigue analysis is to safely design a wind turbine that sustains repeated loads within its design life. In this study, the blades and loads for the fatigue analysis of a 12-MW floating offshore wind turbine are calculated based on the National Renewable Energy Laboratory (NREL) 5-MW wind turbine blades. The calculated loads are applied to the Markov matrix through a preprocessing, such as the cycle counting method. Finally, the equivalent fatigue load is estimated based on both mean and range. In this study, only the equivalent fatigue load on the turbine blade is calculated. However, if fatigue analysis is to be performed for all parts using equivalent loads, it is possible to design the wind turbine to fully withstand such loads throughout its design life, and prevent the overdesign of each part as well.

A Comprehensive Aero-Hydro-Structural Analysis of a 5 MW Offshore Wind Turbine System

2019 ◽  
Vol 141 (6) ◽  
Author(s):  
Scott Smith ◽  
Abdul-Bari Syed ◽  
Kan Liu ◽  
Meilin Yu ◽  
Weidong Zhu ◽  
...  
Keyword(s):  
Structural Analysis ◽  
Stress Field ◽  
Wind Turbine ◽  
Turbine Rotor ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Foundation Design ◽  
Structural Dynamic ◽  
Wind Turbine System ◽  
Analysis Strategy

A comprehensive aero-hydro-structural analysis is conducted for a 5 MW offshore wind turbine system in this study. Soil–structure interaction under complex aero-hydro loading is analyzed to provide a suitable foundation design with high safety. With consideration of the wind turbine size and water depth, the monopile foundation design by the National Renewable Energy Laboratory (NREL) is selected in the current study. Both aerodynamic loading for the 5 MW wind turbine rotor defined by NREL and hydrodynamic loading on the foundation are simulated under different flow conditions using high-fidelity computational fluid dynamics methods. Structural dynamic analysis is then carried out to estimate the stress field in the foundation and soil. Results from the comprehensive analysis indicate that the Morison equation is conservative when looking at the stress field in the monopile foundation and underestimates the stress field in soil. A similar analysis strategy can be applied to other types of foundations such as jacket foundations and lead to more economical and reliable designs of foundations.

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