Discussion on Coupling Effect in Structural Load of FOWT for Condensing Wind and Wave Bins for Spectral Fatigue Analysis
Discussion on Coupling Effect in Structural Load of FOWT for Condensing Wind and Wave Bins for Spectral Fatigue Analysis
复制标题
用于光谱疲劳分析的冷凝风浪箱结构载荷耦合效应的探讨
DOI：
10.3390/jmse8110937
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发表时间：
2020-11
影响因子：
2.9
通讯作者：
Tomoya Inoue;A. Adilah;K. Iijima;Sho Oh;Hideyuki Suzuki
中科院分区：
文献类型：
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作者：
Tomoya Inoue;A. Adilah;K. Iijima;Sho Oh;Hideyuki Suzuki
浮式海上风力涡轮机（FOWTs）受到风和波的联合载荷。由于非线性耦合效应，结构响应不能简单地表示为仅风响应和仅波响应的总和，这使得结构分析更加复杂和耗时。当采用谱法进行结构疲劳分析时，需要在考虑耦合效应的情况下准确估计组合应力的方差。本文首先研究了组合响应的特性。结果表明，耦合效应是双重的；一是在波频范围内强迫运动的气动激励载荷增加。另一种是相对风速增大引起的气动阻尼效应，在结构振动频率范围内表现突出。建立了数学模型来解释这些耦合效应。然后，对三种类型的fowt进行了一系列的仿真，以验证模型的有效性。结果表明，三种平台的组合响应特征不同，与两种解耦的仅波浪和仅风模拟相比，所建立的模型可以解释组合应力方差的增减。
Floating Offshore Wind Turbines (FOWTs) are subject to combined wind and wave loads. The response is not given as a simple sum of the wind-only response and wave-only response due to nonlinear coupling effects, which makes the structural analysis more complex and time-consuming. When a spectral approach for the structural fatigue analysis is considered, it is necessary to accurately estimate the variance of the combined stress taking account of the coupling effect. In this study, firstly the characteristics of the combined response are investigated. It is found out the coupling effects are two-fold; one is the aerodynamic exciting load increase for the forced motion in the wave frequency range. The other is the aerodynamic damping effect due to the increase of the relative wind speed, which is prominent in the structural vibration frequency range. Mathematical models to account for these coupling effects are developed. Then, a series of simulations are performed on three types of FOWTs to validate the models. It is shown that the characteristics of the combined response are different among the three types of the platforms and the developed model can explain the increase/decrease of the variance of the combined stress when compared with two decoupled wave-only and wind-only simulations.