Abstract Typical industry models for Offshore Wind Turbines with fixed substructures are based on decoupled models between the wind turbine and the substructure. It is proved that the complete dynamic response of the structure can only be captured with coupled models. In this paper a fully-coupled model for Offshore Wind Turbines with jacket support is presented. The computational model allows to obtain an accurate response of the whole structure and the dynamic interaction between all the elements. It also allows to reproduce particular effects such as the aerodynamic damping without the need for artificial damping ratios which would be needed in decoupled models. Typical environmental offshore conditions are integrated in the model and the response of the structure is obtained by means of a non-linear time integration algorithm in order to include the effect of the continuous rotation of the blades. A cost-efficient approach for the determination of fatigue-damage in the joints of the jackets is proposed. It is based on short-time simulations which allow to accurately estimate the long-term damage in general. The estimation shows a good agreement when compared to the damage values obtained by performing the whole time-interval simulation.

中文翻译：

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使用全耦合模型和非线性动力学分析估计固定子结构的长期疲劳损伤

摘要 具有固定子结构的海上风力涡轮机的典型工业模型基于风力涡轮机和子结构之间的解耦模型。证明结构的完整动力响应只能通过耦合模型来捕获。在本文中，提出了具有导管架支撑的海上风力涡轮机的全耦合模型。计算模型允许获得整个结构的准确响应以及所有元素之间的动态相互作用。它还允许重现特定的效果，例如空气动力学阻尼，而无需人工阻尼比，而这在解耦模型中是必需的。典型的海上环境条件被集成到模型中，结构的响应是通过非线性时间积分算法获得的，以包括叶片连续旋转的影响。提出了一种确定夹克接头疲劳损伤的经济高效的方法。它基于短期模拟，可以准确估计一般的长期损害。与通过执行整个时间间隔模拟获得的损伤值相比，估计显示出良好的一致性。