Frequency domain approach for the coupled analysis of floating wind turbine system

This paper presents a simple frequency domain approach to predict the coupled response of floating wind turbine based on AQWA, and then investigates the effect of damping induced by wind, current and mooring system on the floating foundation response. This approach is validated against the experiment of DeepCwind floating offshore wind turbine in literatures. The results show reasonable agreement, and also indicate that the drift damping should be elaborated for the drift response. Based on this approach, the effect of wind and current on the floating wind turbine response is parametrically investigated. These aspects have rare effect on the wave frequency response, but affect the drift response due to the introduction of damping. The comparison between quasi-static and dynamic mooring line models reveals that the dynamics and added mass of mooring line play negligible roles, but the drag force significantly damps down the surge drift response.