ABSTRACT

The dynamic response of a 5 MW floating wind turbine is examined using the coupled finite element simulations, and the dynamic effects of the catenary is considered, while the coupling between flexible components are included. The restoring performance of the mooring-line is analysed based on the vector equations and numerical simulations. The stiffness hysteresis and the influence of the catenary dynamics on the restoring performance are studied. Then the structural responses undergoing wind and wave loads, are examined. Our results show that the mooring-line tension significantly rise due to catenary dynamics, and the snap tension gets around three times larger. The mooring-line stiffness presents a hysteresis character, owing to the fluid/structural damping, which becomes more obvious with the increase of motion frequency/amplitude. Moreover, the structural response gets smaller principally because of the hysteresis effect. The spar displacement and the tower root stress become respectively 18.4% and 32.7% smaller.

摘要

使用耦合有限元模拟检查了 5 MW 浮动风力涡轮机的动态响应，并考虑了悬链线的动态效应，同时包括柔性部件之间的耦合。基于矢量方程和数值模拟分析了系泊缆的恢复性能。研究了刚度滞后和悬链线动力学对恢复性能的影响。然后检查承受风和波浪载荷的结构响应。我们的结果表明，由于悬链线动力学，系泊线张力显着上升，而快速张力大约增加了三倍。由于流体/结构阻尼，系泊线刚度呈现出滞后特性，随着运动频率/幅度的增加，这种特性变得更加明显。而且，结构响应变小主要是由于滞后效应。翼梁位移和塔根应力分别减小了 18.4% 和 32.7%。