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Fatigue Load Analysis of Yawed Wind Turbines Considering Geometric Nonlinearity of Blades

Author

Listed:
  • Dereje Haile Hirgeto

    (State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China)

  • Guo-Wei Qian

    (Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Ocean Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China)

  • Xuan-Yi Zhou

    (State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China)

  • Wei Wang

    (State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China)

Abstract

Fatigue damage of yawed wind turbine components can be caused by repeated long-term unsteady asymmetric inflow loads across the rotor swept area, necessitating fatigue load analysis to ensure the in-operation safety of wind turbines. This study investigates the impact of geometric nonlinearity on the fatigue loads of wind turbine components. The geometrically exact beam theory (GEBT), implemented in BeamDyn of OpenFAST, is employed to model full geometric nonlinearity. For comparison, ElastoDyn in OpenFAST, which uses the generalized Euler–Bernoulli beam theory for straight isotropic beams, is also utilized. Aeroelastic simulations were conducted for the national renewable energy laboratory (NREL 5 MW) and international energy agency (IEA) 15 MW wind turbines. Fatigue loads, quantified by the damage equivalent load (DEL) based on Palmgren–Miner’s rule, were analyzed for critical components, including blade out-of-plane (OOP) moments, low-speed shaft (LSS) torque, LSS bending moment (LSSBM), and tower base bending moment (TBBM). Results indicate that geometric nonlinearity significantly influences fatigue damage in critical turbine components, with significant differences observed between BeamDyn and ElastoDyn simulations.

Suggested Citation

  • Dereje Haile Hirgeto & Guo-Wei Qian & Xuan-Yi Zhou & Wei Wang, 2025. "Fatigue Load Analysis of Yawed Wind Turbines Considering Geometric Nonlinearity of Blades," Energies, MDPI, vol. 18(19), pages 1-23, October.
  • Handle: RePEc:gam:jeners:v:18:y:2025:i:19:p:5290-:d:1765764
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    References listed on IDEAS

    as
    1. He, Ruiyang & Yang, Hongxing & Lu, Lin, 2023. "Optimal yaw strategy and fatigue analysis of wind turbines under the combined effects of wake and yaw control," Applied Energy, Elsevier, vol. 337(C).
    2. Sun, Jili & Chen, Zheng & Yu, Hao & Gao, Shan & Wang, Bin & Ying, You & Sun, Yong & Qian, Peng & Zhang, Dahai & Si, Yulin, 2022. "Quantitative evaluation of yaw-misalignment and aerodynamic wake induced fatigue loads of offshore Wind turbines," Renewable Energy, Elsevier, vol. 199(C), pages 71-86.
    3. Wang, Lin & Liu, Xiongwei & Guo, Lianggang & Renevier, Nathalie & Stables, Matthew, 2014. "A mathematical model for calculating cross-sectional properties of modern wind turbine composite blades," Renewable Energy, Elsevier, vol. 64(C), pages 52-60.
    4. Wang, Baoxuan & Wang, Lizhong & Liang, Xu & Sheng, Fangyuan & Zhang, Jianwei & Hong, Yi & Wang, Lilin, 2024. "3D multiscale dynamic analysis of offshore wind turbine blade under fully coupled loads," Renewable Energy, Elsevier, vol. 223(C).
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