Study on Rigid-Flexible Coupling Effects of Floating Offshore Wind Turbines
- 12 Downloads
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.
Key wordsfloating offshore wind turbine dynamic stiffening effect nonlinear coupled dynamic model DARwind
Unable to display preview. Download preview PDF.
This work was supported by the State Key Lab of Ocean Engineering, Shanghai Jiao Tong University, and all of these supports are gratefully acknowledged by the authors.
- Faltinsen O.M., 1990. Sea Loads on Ships and Offshore Structures, Cambridge University Press, Cambridge, New York.Google Scholar
- Held A., Nowakowski C., Moghadasi A., Seifried R. and Eberhard P., 2016. On the influence of model reduction techniques in topology optimization of flexible multibody systems using the floating frame of reference approach, Structural and Multidisciplinary Optimization, 53(1), 67–80.MathSciNetCrossRefGoogle Scholar
- Hu Z.Q., Chen J.H. and Liu G.L., 2017. Investigation on high-order coupled rigid-flexible multi-body dynamic code for offshore floating wind turbines, Proceedings of the 36th International Conference on Ocean, Offshore and Arctic Engineering, ASEM, Trondheim, Norway.Google Scholar
- Ma Y., Hu Z.Q. and Xiao L.F., 2015. Wind-wave induced dynamic response analysis for motions and mooring loads of a spar-type offshore floating wind turbine, Journal of Hydrodynamics, Ser. B, 26(6), 865–874.Google Scholar
- Marshall B., 2002. NWTC Information Portal, https://nwtc.nrel.gov/Modes [2014-09-28].Google Scholar
- Masciola M., Jonkman J. and Robertson A., 2013. Implementation of a multisegmented, quasi-static cable model, Proceedings of the 23rd International Offshore and Polar Engineering Conference, International Society of Offshore and Polar Engineers, Alaska, USA.Google Scholar
- Nada A.A., Hussein B.A., Megahed S.M. and Shabana A.A., 2010. Use of the floating frame of reference formulation in large deformation analysis: Experimental and numerical validation, Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multibody Dynamics, 224(1), 45–58.Google Scholar
- Newman J.N., 1997. Marine Hydrodynamics, The MIT Press, Cambridge, Massachusetts, USA.Google Scholar
- Øye S., 1996. FLEX4 simulation of wind turbine dynamics, Proceedings of the 28th IEA Meeting of Experts Concerning State of the Art of Aeroelastic Codes for Wind Turbine Calculations, Technical University of Denmark, Lyngby.Google Scholar