STUDY ON SECOND-ORDER VORTEX-INDUCED VIBRATION CHARACTERISTICS OF HIGH-FLEXIBLE TOWERS OF WIND TURBINES

Tao Tao; Long Kai; Bai Xinjian; Liu Yongqian

doi:10.19912/j.0254-0096.tynxb.2021-0993

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (2) : 498-503. DOI: 10.19912/j.0254-0096.tynxb.2021-0993

STUDY ON SECOND-ORDER VORTEX-INDUCED VIBRATION CHARACTERISTICS OF HIGH-FLEXIBLE TOWERS OF WIND TURBINES

Tao Tao^1,2, Long Kai^1,2, Bai Xinjian^1,2, Liu Yongqian^1,2

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Abstract

The existing wind turbine vortex-vibration researohes usually focus on the first-order vortex-induced vibration of the rigid tower regardless of the top mass instead of ignoring. The second-order vortex-induced vibration of the high-flexible tower with top mass is neglected. This study mainly concentrates on the second-order vortex-induced vibration characteristics of wind turbine high flexible towers. Firstly, the wind turbine model containing a high-flexible tower is established using GH Bladed software. The natural frequencies and vibration modes of the high-flexible tower are obtained through modal analysis. Then, the inertial force at each height under the altion of the second-order vortex-induced vibration is calculated according to the relevant standards. Finally, taking 2 MW high-flexible tower wind turbine as the reasearch object, the second-order vortex-induced vibration characteristics are analyzed and compared with the counterpart in the fundamental vortex-induced pattern. The results reveal that the influence of the first-order vortex-induced vibration the tower strength can be ignored. However, the second-order vortex-induced vibration may easily lead to insufficient tower strength, which is a potential risk of tower collapse.

Key words

wind turbines / towers / fatigue damage / vortex-induced vibration / ultimate strength

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Tao Tao, Long Kai, Bai Xinjian, Liu Yongqian. STUDY ON SECOND-ORDER VORTEX-INDUCED VIBRATION CHARACTERISTICS OF HIGH-FLEXIBLE TOWERS OF WIND TURBINES[J]. Acta Energiae Solaris Sinica. 2022, 43(2): 498-503 https://doi.org/10.19912/j.0254-0096.tynxb.2021-0993

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