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Ocean Systems Engineering   Volume 1, Number 1, March 2011, pages 95-111
Rotor-floater-mooring coupled dynamic analysis of mono-column-TLP-type FOWT (Floating Offshore Wind Turbine)
Y.H. Bae and M.H. Kim

Abstract     [Buy Article]
    Increasing numbers of floating offshore wind turbines are planned and designed these days due to their high potential in massive generation of clean energy from water depth deeper than 50 m. In the present study, a numerical prediction tool has been developed for the fully-coupled dynamic analysis of FOWTs in time domain including aero-blade-tower dynamics and control, mooring dynamics, and platform motions. In particular, the focus of the present study is paid to the dynamic coupling between the rotor and floater and the coupled case is compared against the uncoupled case so that their dynamic coupling effects can be identified. For this purpose, a mono-column mini TLP with 1.5MW turbine for 80m water depth is selected as an example. The time histories and spectra of the FOWT motions and accelerations as well as tether top-tensions are presented for the given collinear wind-wave condition. When compared with the uncoupled analysis, both standard deviations and maximum values of the floater responses/tower-accelerations and tether tensions are appreciably increased as a result of the rotorfloater dynamic coupling, which may influence the overall design including fatigue-life estimation especially when larger blades are to be used.
Key Words
    renewable wind energy; FOWT (floating offshore wind turbine); rotor-floater-tether coupled dynamics; coupled vs. uncoupled analysis; mono-column mini TLP; tower elasticity; blade control/aerodynamics; floater responses; tower accelerations; tether tension; fatigue life.
Y.H. Bae :Texas A&M University, College Station, TX, USA
M.H. Kim :Civil Engineering, Texas A&M University, College Station, TX, USA

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