DYNAMIC CHARACTERISTICS OF LARGE MONOPILE OFFSHORE WIND TURBINE UNDER WIND-ICE INTERACTION

Zhang Lixian; Shi Wei; Li Xin; Chai Wei; Zhen Chunbo

doi:10.19912/j.0254-0096.tynxb.2021-1001

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (2) : 59-66. DOI: 10.19912/j.0254-0096.tynxb.2021-1001

DYNAMIC CHARACTERISTICS OF LARGE MONOPILE OFFSHORE WIND TURBINE UNDER WIND-ICE INTERACTION

Zhang Lixian¹, Shi Wei¹, Li Xin¹, Chai Wei², Zhen Chunbo³

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Abstract

Considering the combined effect of wind load and ice load on large single-pile offshore wind turbine, based on IEA 15 MW offshore wind turbine, coupled numerical model under the ice and wind condition is developed using the Openfast code. This paper carries out the dynamic analysis of a large monopile offshore wind turbine under the wind and ice interaction and explores the influence of different loading time durations, ice models, and different damage evaluation methods on the characteristics of the structural responses. The calculation results show that there is a great difference between the calculation results of the numerical calculation models with different ice loads on the tower and the mud surface line. The fatigue damage rate at the mudline is higher than that at the tower base, which should be paid more attention to. When the traditional load combination method is used to calculate the fatigue damage rate of wind turbine structure, the fatigue damage rate is smaller than that under the combined action of wind and ice, and the fatigue damage is underestimated. Therefore, the coupled wind-ice-structure analysis is recommended to estimate the fatigue damage for large monopile offshore wind turbines.

Key words

offshore wind turbines / supporting structure / numerical analysis / ice induced vibration / fatigue damage

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Zhang Lixian, Shi Wei, Li Xin, Chai Wei, Zhen Chunbo. DYNAMIC CHARACTERISTICS OF LARGE MONOPILE OFFSHORE WIND TURBINE UNDER WIND-ICE INTERACTION[J]. Acta Energiae Solaris Sinica. 2023, 44(2): 59-66 https://doi.org/10.19912/j.0254-0096.tynxb.2021-1001

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