Fatigue design of monopile foundation for an offshore wind turbine using multi-body dynamic analysis is the theme of this paper. For this purpose, a benchmark turbine is modelled in Kane's approach considering soil-structure interaction for a site at the North Sea. Each soil layer is modelled using the p-y curve, and the dynamic response of the combined system is simulated using aero-hydro-servo-elastic analysis. The fatigue life is estimated following IEC 61400-3 guidelines. The numerical analysis presented in this study shows stress-based fatigue analysis using rainflow algorithm in the light of soil-structure interaction for short-term damage accumulation. Besides short-term effects, the study also investigates serviceability criteria over the lifespan of the structure, i.e. long-term effects. Finally, design curves are developed for a given power rating. Overall, the study highlights the importance of soil-structure interaction and its impact on the fatigue life of offshore wind turbines.

本文以多体动力分析为基础，对海上风机单桩基础进行了疲劳设计。为此，在凯恩（Kane）的方法中对基准涡轮机进行了建模，其中考虑了北海某地点的土壤与结构相互作用。使用py曲线对每个土壤层进行建模，并使用航空-水-伺服-弹性分析法模拟组合系统的动力响应。疲劳寿命是根据IEC 61400-3准则估算的。这项研究提供的数值分析显示了基于雨水算法的基于应力的疲劳分析，它是根据土与结构的相互作用来短期累积损伤的。除了短期影响外，该研究还调查了结构使用寿命内的可使用性标准，即长期影响。最后，设计曲线针对给定的额定功率制定。总体而言，该研究突出了土壤与结构相互作用的重要性及其对海上风力涡轮机疲劳寿命的影响。