This paper is to investigate and compare hydrodynamics of four different floating platforms for wind turbines, including the natural frequencies, RAOs and standard deviations of motions subjected to the possible sea states of East China Sea at five different water depths (30-200 m) based on potential wave theory. The results show that the semi-submersible platform has smaller natural frequencies and standard deviations than the barges in heave and pitch and that the water depth has significant effects on the floating platforms when it is less than 62.5m in the tested cases. The effects of a heave plate with different diameters on heave RAOs is also studied by using the dipole method with viscosity estimated by an empirical formula, and find that the heave RAOs may not be reduced by the heave plate and the increase of its diameter.
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