Dynamic response in frequency and time domains of a floating foundation for offshore wind turbines

In this paper, the dynamic behaviors are studied for the semi-submersible floating foundation of a 600 kW wind turbine in 60 m deep water considering the coupled load effects of wind turbine–tower-floating foundation and mooring lines and ocean environment. The paper focuses on the key issues of floating foundation design, such as coupling dynamic analysis model and calculating methods. The finite element models are established and dynamic responses of floating wind turbine system under different combinations of turbulent wind, constant current and irregular wave are calculated in frequency and time domains by the use of the SESAM software. The motion performance and line tension are investigated. The results show that the semi-submersible floating foundation and mooring system can work in the ocean environment with significant wave height less than 4 m.

► The reason why the 600 kW wind turbine is selected and the reference where these data are from are added in this paper. ► The reason why the environment conditions are different for the frequency and time domain analysis is added in paper. ► Statistical results are added in Section 3.2.