Abstract This study addresses short-term extreme response and fatigue damage of an integrated wind, wave and tidal energy system. The integrated concept is based on the combination of a spar type floating wind turbine, a wave energy converter and two tidal turbines. Aero-hydro-mooring coupled analysis is performed in time-domain to capture the dynamic response of the combined concept in a set of environmental conditions. The mean up-crossing rate method is used to evaluate the extreme response, which takes advantage of an extrapolation method to reduce the simulation sample size. The cumulative fatigue damage is computed based on the S-N method. Simulation results show that the tower base fore-aft bending moment is improved, in terms of extreme value and fatigue damage. Nevertheless, the tension force of a mooring line is worsened. The mooring line bears increased maximum tension due to the tidal turbine thrust force and it is subjected to higher fatigue damage load as well.

中文翻译：

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综合海上可再生能源系统的短期极端响应与疲劳破坏

摘要 本研究解决了综合风能、波浪能和潮汐能系统的短期极端响应和疲劳损伤。集成概念基于翼梁式浮动风力涡轮机、波浪能转换器和两个潮汐涡轮机的组合。Aero-Hydro-Mooring 耦合分析在时域中执行，以捕获组合概念在一组环境条件下的动态响应。平均上交叉率方法用于评估极端响应，它利用外推方法来减少模拟样本量。累积疲劳损伤是基于 SN 方法计算的。仿真结果表明，塔基前后弯矩在极值和疲劳损伤方面都有所提高。然而，系泊缆绳的张力会变差。