Influences of the cone structure of a monopile offshore wind turbine on its dynamic responses under ice loading condition

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (22) : 225-230.

XU Zifei, YE Kehua, LI Chun, DING Qinwei, YANG Yang

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Abstract

The support structure stability is the fundamental guarantee for the operation safety of offshore wind turbines.A NREL 5 MW wind turbine was selected as the baseline turbine and the ice loads were estimated by using the Ralston theory and considering the turbulent wind.The dynamic behaviors of the wind turbine tower installed with a cone structure of different cone angle were inspected and compared with those of the baseline turbine.The results show that the cone structure has significant effect on the reducing of ice loads, tower top acceleration and displacement.The average ice load and tower top acceleration in the case of 40° cone angle will be respectively reduced by 83.8% and 43.1% when the cone angle changes to 70°.Comparing with the baseline turbine, the tower-top displacements at the first order natural frequencies of the tower and the wind wheel in the case of 40° cone angle are reduced by 45% and 80% respectively.

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wind turbine / cone structure / ice load / dynamic response / monopile foundations

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XU Zifei, YE Kehua, LI Chun, DING Qinwei, YANG Yang. Influences of the cone structure of a monopile offshore wind turbine on its dynamic responses under ice loading condition[J]. Journal of Vibration and Shock, 2018, 37(22): 225-230

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