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© 2019, Chinese Ocean Engineering Society and Springer-Verlag GmbH Germany, part of Springer Nature. In order to account for rigid-flexible coupling effects of floating offshore wind turbines, a nonlinear rigid-flexible coupled dynamic model is proposed in this paper. The proposed nonlinear coupled model takes the higher-order axial displacements into account, which are usually neglected in the conventional linear dynamic model. Subsequently, investigations on the dynamic differences between the proposed nonlinear dynamic model and the linear one are conducted. The results demonstrate that the stiffness of the turbine blades in the proposed nonlinear dynamic model increases with larger overall motions but that in the linear dynamic model declines with larger overall motions. Deformation of the blades in the nonlinear dynamic model is more reasonable than that in the linear model as well. Additionally, more distinct coupling effects are observed in the proposed nonlinear model than those in the linear model. Finally, it shows that the aerodynamic loads, the structural loads and global dynamic responses of floating offshore wind turbines using the nonlinear dynamic model are slightly smaller than those using the linear dynamic model. In summary, compared with the conventional linear dynamic model, the proposed nonlinear coupling dynamic model is a higher-order dynamic model in consideration of the rigid-flexible coupling effects of floating offshore wind turbines, and accord more perfectly with the engineering facts.
Author(s): Chen J-H, Hu Z-Q, Liu G-L, Wan D-C
Publication type: Article
Publication status: Published
Journal: China Ocean Engineering
Print publication date: 01/03/2019
Online publication date: 31/01/2019
Acceptance date: 15/11/2018
ISSN (print): 0890-5487
ISSN (electronic): 2191-8945
Publisher: Springer Verlag
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