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Scaling of slow-drift motion with platform size and its importance for floating wind turbines

Author

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  • Lupton, R.C.
  • Langley, R.S.

Abstract

Slow drift is a large, low-frequency motion of a floating platform caused by nonlinear hydrodynamic forces. Although slow drift is a well-known phenomenon for ships and other floating structures, new platforms for floating wind turbines are significantly smaller in scale, and it is yet to be established how important slow drift is for them. In this paper we derive an approximate expression for the scaling of the slow drift motion with platform size, mooring characteristics and wave conditions. This suggests that slow drift may be less important for floating wind turbines than other, larger, floating structures. The accuracy of the approximations is discussed; in the one case where detailed data is available, the approximate result is found to be conservative by a factor of up to 40.

Suggested Citation

  • Lupton, R.C. & Langley, R.S., 2017. "Scaling of slow-drift motion with platform size and its importance for floating wind turbines," Renewable Energy, Elsevier, vol. 101(C), pages 1013-1020.
    • Handle: RePEc:eee:renene:v:101:y:2017:i:c:p:1013-1020
    DOI: 10.1016/j.renene.2016.09.052
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    Cited by:

    1. Lupton, Richard C. & Langley, Robin S., 2019. "Complex but negligible: Non-linearity of the inertial coupling between the platform and blades of floating wind turbines," Renewable Energy, Elsevier, vol. 134(C), pages 710-726.
    2. Lupton, Richard C. & Langley, Robin S., 2019. "Improved linearised models of wind turbine aerodynamics and control system dynamics using harmonic linearisation," Renewable Energy, Elsevier, vol. 135(C), pages 148-162.

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