Abstract
In recent years, the SPM (Single-Point Mooring) concept has been widely employed in several branches of the naval architecture and marine engineering field, such as FPSOs (Floating Production, Storage and Offloading units), offshore oil rigs, etc., but not yet popular in the offshore wind energy. To investigate the response characteristics of an SPM-moored FWT (Floating Wind Turbine), in the present work, we perform a numerical study on the DeepCwind semisubmersible wind turbine, using the state-of-the-art open-source tool FAST. The free-decay test results show that the SPM layout affects the natural periods of the wind turbine in rotational modes, as well as the mooring stiffness of the diagonal rotational and crossing rotational-translational terms, especially in relation to the yaw mode. Comparisons of the RAOs (Response Amplitude Operators) elucidate that the presence of wind influences significantly the sway, roll and yaw motions of the SPM layout. Finally, the weathervane test shows that an asymmetry exists in the free-yaw motion response when the semisubmersible wind turbine is moored by an SPM system.
Highlights
IntroductionThe OWE technology is witnessing a booming development in which a variety of new conceptual designs have been realized [1,2,3,4]
OWE (Offshore Wind Energy) is a promising substitution of the traditional fossil fuels in the future.In recent years, the OWE technology is witnessing a booming development in which a variety of new conceptual designs have been realized [1,2,3,4]
A numerical analysis has been done on finding the response characteristics of a
Summary
The OWE technology is witnessing a booming development in which a variety of new conceptual designs have been realized [1,2,3,4]. One of the most recent developments is the concept of an FWT (Floating Wind Turbine) moored by an SPM Iijima et al [5] designed a sample of an SPM-moored semisubmersible FWT and carried out a 1/100 scaled model test on the wave basin. Koh et al [6] performed a numerical analysis of a single-point moored TLS (Tension Leg Spar) and found that the TLS could self-adjust its orientation to the inflow wind direction. From a technical point of view, the application of an SPM system enables the FWT to have free-yaw motions when the wind changes direction, which can be viewed as
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