Transient dynamics analysis of a large-scale jacket offshore wind turbine under seismic loading

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (22) : 175-182.

YAN Yangtian1,XU Zifei1,LI Chun1,DENG Yunhe2,WANG Yuanbo1

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Abstract

In order to study the structural dynamic response of a jacket large-scale offshore wind turbine under seismic loading, the interaction between flexible soil and pile foundation was described by the Winkler soil-structure model.The NREL 5 MW large-scale offshore wind turbine was taken as a research object and studied by constructing a finite element model for the jacket and monopile structure, and the structural transient dynamic responses of two kinds of structures were calculated under two kinds of running conditions: normal operation with rated wind speed and earthquake.The results show that under the action of earthquake and turbulent wind, the jacket has better wind and seismic resistance than the monopile wind turbine, and the displacement at the top of the tower is smaller, which can effectively protect the blades and the nacelle.At the time of earthquake, the range of the Mises equivalent stress amplitude of the jacket wind turbine is reduced by 48.7%, and the average value is decreased by 21.9%.The study also finds that in the existing jacket design there will be a local strain energy surge.

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offshore wind turbine / dynamic response / jacket / monopile / seismic / Winkler soil-structure model

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YAN Yangtian1,XU Zifei1,LI Chun1,DENG Yunhe2,WANG Yuanbo1. Transient dynamics analysis of a large-scale jacket offshore wind turbine under seismic loading[J]. Journal of Vibration and Shock, 2020, 39(22): 175-182

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