Numerically efficient fatigue life prediction of offshore wind turbines using aerodynamic decoupling

The fatigue life prediction for offshore wind turbine support structures is computationally demanding, requiring the consideration of a large number combinations environmental conditions and load cases. In this study, efficient methodology combining aerodynamic decoupling modal reduction techniques developed prediction. Aerodynamic implemented to separate structure rotor-nacelle assembly. rotor dynamics were modelled using an damping matrix that accurately captures coupling between fore-aft side-side motions. Soil-structure interaction p-y curves, wave loading calculated based on linear irregular waves Morison's equation at European (North Sea) site. A technique applied significantly reduce required degrees freedom, allowing accurate calculation hotspot stresses damage accumulation. model was verified against fully coupled case-study, monopile supported in terms response evaluation. predicts (within 2%) range parameters fraction computational cost (0.5%) compared model.