Nonlinear waves influence to a large extent the coupled hydro-aero-elastic response of offshore wind turbines. Higher-order contributions in the hydrodynamic forcing are responsible for resonant springing-like vibrations of the tower causing an increase of stress cycles and amplitudes. The present study investigates the effects of these amplifications in terms of fatigue load. Equivalent fatigue loads are estimated by means of both time and frequency domain methods. A comparison between linear, second-order and fully nonlinear wave models is proposed and it is shown that the weakly nonlinear model, widely used in the state-of-the-art simulations, may significantly underestimate the actual fatigue load. Hydrodynamic loads associated with the different wave models are coupled with aerodynamic loads acting on the rotor of a 5-MW wind turbine (fixed-bottom).

Coupled dynamic simulations of offshore wind turbines: influence of wave modeling on the fatigue load assessment / Marino, E.; Lugni, C.; Stabile, Giovanni; Borri, C.; Manuel, L.. - (2014), pp. 1-4. (Intervento presentato al convegno XIII Conference of the Italian Association for Wind Engineering (In-Vento 2014) tenutosi a Genova nel 22-25 giugno 2014).

Coupled dynamic simulations of offshore wind turbines: influence of wave modeling on the fatigue load assessment

Stabile, Giovanni;
2014-01-01

Abstract

Nonlinear waves influence to a large extent the coupled hydro-aero-elastic response of offshore wind turbines. Higher-order contributions in the hydrodynamic forcing are responsible for resonant springing-like vibrations of the tower causing an increase of stress cycles and amplitudes. The present study investigates the effects of these amplifications in terms of fatigue load. Equivalent fatigue loads are estimated by means of both time and frequency domain methods. A comparison between linear, second-order and fully nonlinear wave models is proposed and it is shown that the weakly nonlinear model, widely used in the state-of-the-art simulations, may significantly underestimate the actual fatigue load. Hydrodynamic loads associated with the different wave models are coupled with aerodynamic loads acting on the rotor of a 5-MW wind turbine (fixed-bottom).
2014
Proceedings of the XIII Conference of the Italian Association for Wind Engineering (In-Vento 2014)
1
4
978-88-97752-40-0
Genova University Press
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/33443
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