Coupled systems mechanics

  • 제2권3호
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  • Pages.231-253
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  • 2013
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  • 2234-2184(pISSN)
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  • 2234-2192(eISSN)
테크노프레스 (Techno-Press)
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DOI QR Code

Impact of spar-nacelle-blade coupling on the edgewise response of floating offshore wind turbines

  • Dinh, Van-Nguyen (School of Engineering, Trinity College Dublin) ;
  • Basu, Biswajit (School of Engineering, Trinity College Dublin) ;
  • Nielsen, Soren R.K. (Department of Civil Engineering, Aalborg University)
  • 투고 : 2013.06.12
  • 심사 : 2013.09.25
  • 발행 : 2013.09.25
⟨ 이전 논문 다음 논문 ⟩

초록

The impact of spar-nacelle-blade coupling on edgewise dynamic responses of spar-type floating wind turbines (S-FOWT) is investigated in this paper. Currently, this coupling is not considered explicitly by researchers. First of all, a coupled model of edgewise vibration of the S-FOWT considering the aerodynamic properties of the blade, variable mass and stiffness per unit length, gravity, the interactions among the blades, nacelle, spar and mooring system, the hydrodynamic effects, the restoring moment and the buoyancy force is proposed. The aerodynamic loads are combined of a steady wind (including the wind shear) and turbulence. Each blade is modeled as a cantilever beam vibrating in its fundamental mode. The mooring cables are modeled using an extended quasi-static method. The hydrodynamic effects calculated by using Morison's equation and strip theory consist of added mass, fluid inertia and viscous drag forces. The random sea state is simulated by superimposing a number of linear regular waves. The model shows that the vibration of the blades, nacelle, tower, and spar are coupled in all degrees of freedom and in all inertial, dissipative and elastic components. An uncoupled model of the S-FOWT is then formulated in which the blades and the nacelle are not coupled with the spar vibration. A 5MW S-FOWT is analyzed by using the two proposed models. In the no-wave sea, the coupling is found to contribute to spar responses only. When the wave loading is considered, the coupling is significant for the responses of both the nacelle and the spar.

키워드

참고문헌

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  10. Vibration control of spar‐type floating offshore wind turbine towers using a tuned mass‐damper‐inerter vol.27, pp.1, 2020, https://doi.org/10.1002/stc.2471
  11. Use of Kane’s Method for Multi-Body Dynamic Modelling and Control of Spar-Type Floating Offshore Wind Turbines vol.14, pp.20, 2013, https://doi.org/10.3390/en14206635