Effects of wind-wave misalignment on dynamic characteristics of floating offshore wind turbine foundation

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (13) : 230-237.

LI Xiuhe,ZHU Caichao, TAN Jianjun,FAN Zhixin,NI Gaoxiang

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Abstract

Here, effects of wind-wave misalignment on dynamic characteristics of a floating offshore wind turbine foundation were investigated. A 5 MW floating offshore wind turbine was taken as the studying object, its aerodynamic loads were simulated with the equivalent load method, and its coupled dynamic model was established. Under working conditions of wind-wave angles of 0°, 30°, 60° and 90°, changes of dynamic characteristics of the turbine foundation were studied. Results showed that effects of wind-wave misalignment on the floating platform’s surge and sway equilibrium positions are very large, while wind-wave misalignment has little effects on the floating platform’s heave response; with increase in wind-wave angle, the platform’s roll and yaw oscillation ranges increase, while its pitch oscillation range decreases; wind-wave misalignment makes the mooring system’s tension response vary obviously, the tension variation trend is related to platform motions and mooring arrangement.

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wind-wave misalignment / floating offshore wind turbine foundation / mooring system / dynamic model / dynamic characteristics

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LI Xiuhe,ZHU Caichao, TAN Jianjun,FAN Zhixin,NI Gaoxiang. Effects of wind-wave misalignment on dynamic characteristics of floating offshore wind turbine foundation[J]. Journal of Vibration and Shock, 2020, 39(13): 230-237

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