Discussion on Coupling Effect in Structural Load of FOWT for Condensing Wind and Wave Bins for Spectral Fatigue Analysis

Journal of Marine Science and Engineering

Ahmad Adilah¹  Kazuhiro Iijima¹  Tomoya Inoue¹  Hideyuki Suzuki²  Sho Oh³ 

[1] Department of Naval Architecture and Ocean Engineering, Osaka University, Osaka 565-0871, Japan;Department of Systems Innovation, The University of Tokyo, Tokyo 113-8654, Japan;Renewable Energy Department, Nippon Kaiji Kyokai, Tokyo 102-8567, Japan;

关键词: FOWT;    coupling effect;    fatigue;    spar;    semi-submersible;    TLP;   

DOI  :  10.3390/jmse8110937

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown