A numerical model based on blade element momentum theory was developed to investigate the effects of floater motion on the dynamic responses of a floating tidal turbine in this paper. SJTU-FTT, a floating tidal turbine system, was introduced. A simplified numerical approach was proposed, in which the 6-DOF motion of the floater was calculated in frequency domain in advance and then was transferred to the unsteady BEM model as inputs. The hydrodynamic coefficients including (added mass, damping, and RAOs) of the floater were presented. The response spectra of the thrust, torque and blade bending moments on the tidal turbine were discussed. Two peaks in the response spectra can be clearly identified, caused by surge and pitch motion of the floater. It was seen that the dynamic loads considering 6-DOF floater motion were much larger than the results from wave only cases.

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