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The shape design and analysis of floating offshore wind turbine structures with damper structure and shallow draft

Authors
Kim, J.H.Hong, S.Y.Kim, H.J.
Issue Date
2013
Keywords
9-node hobem; Damper structure; Floating offshore wind turbine(FOWT); Global performance; Model test; Motion & acceleration at nacelle; Semi-submersible; Spar
Citation
Proceedings of the International Offshore and Polar Engineering Conference, pp 329 - 335
Pages
7
Journal Title
Proceedings of the International Offshore and Polar Engineering Conference
Start Page
329
End Page
335
URI
https://www.kriso.re.kr/sciwatch/handle/2021.sw.kriso/8755
ISSN
1098-6189
Abstract
The floating offshore wind turbines(FOWTs) are considered as a promising candidate due to high-quality of wind energy and environmental friendliness. There are typical three types of conceptual design of FOWTs such as Spar, Semi-submersible, and TLP. Recently, Hywind-OC3 spar and WindFloat semi-submersible type structures as 5MW class have been studied. In the present study, a series of parametric study for several shape design of FOWT have been conducted considering the wide operable water depth by having a shorter draft than one of typical spar and cost effective construction by numerical analysis using a 9-node higherorder boundary element method(HOBEM). In the parametric study, the wind turbine platform which has the truss spar type shape with damper structure to reduce the motion & acceleration responses is suggested. The numerical results for the selected shape design of FOWT were validated through a series of convergence test and model test data. In the series of model tests at ocean engineering basin, MOERI/KIOST, motion and acceleration at Nacelle responses were obtained for regular and irregular waves. The global performance of the model structure has been compared with same class spar-type structure, 5MW Hywind-OC3. Finally, a shape design of FOWT to get more improved global motion performance and technical feasibility was also discussed. Copyright ? 2013 by the International Society of Offshore and Polar Engineers (ISOPE).
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