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

摘要

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.