Sea-ice load analysis of offshore wind turbines based on self-excited ice induced vibration

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (24) : 177-183.

YE Kehua1 LI Chun1.2 YANG Yang1 SUN Rui1 ZHANG Wanfu1.2

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Abstract

Sea-ice load is one of the main loads of offshore wind turbines in severe cold sea regions, it has features of large action force, lasting as long and complex vibration characteristics. It has great influences on dynamic responses of wind turbines, especially, the tower of wind turbines. To study influences of sea-ice load on wind turbines, a NREL 5 MW offshore wind turbine was taken as a study object. Based on Kaimal wind speed spectrum, a turbulence wind field was built. The self-excited ice induced vibration model and FAST program were adopted to calculate shear forces exerted on the tower base of the turbine under the action of sea-ice load. The results showed that due to the “negative slope” of sea-ice strength, the wind turbine performs a self-excited vibration under the action of sea-ice with low or medium ice velocity; the self-excited vibration makes shear forces exerted on the tower base of the turbine grow obviously, their increasing level decreases with increase in thickness of sea-ice; shear forces’ fluctuation in tower base forward-backward direction is bigger than that in tower base left side-right side direction; sea-ice load leads to increase in the tower top displacement amplitude near 1.1Hz.

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Määttänen self-excited ice induced vibration / offshore wind turbine / shear force on tower base / Kane method

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YE Kehua1 LI Chun1.2 YANG Yang1 SUN Rui1 ZHANG Wanfu1.2. Sea-ice load analysis of offshore wind turbines based on self-excited ice induced vibration[J]. Journal of Vibration and Shock, 2017, 36(24): 177-183

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