In this research, a numerical simulation method for a coupled system of a Floating Offshore Wind Turbine (FOWT) and its mooring system is developed. Flexibility of the platform and the nonlinear properties of mooring can be accounted for by the proposed method. A series of scaled model experiments which include the TLP and SPAR types of FOWT are also performed to evaluate the response of the FOWTs under combined wind and wave loads. Steady wind and regular waves are applied to the models. Measurements are made on strains in the structure, tension variation in the mooring as well as the rigid body motions of the platform. For validating the numerical model, comparison between the experimental and simulation results is made. An acceptable correlation between the experimental and the simulation results is obtained. It is shown that the flexibility of the platform may affect the tension variation in the mooring.

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