CALCULATION METHOD FOR FATIGUE CUMULATIVE DAMAGE OF WIND TURBINE BLADES UNDER UNCERTAIN WIND LOADS

Gao Jiajia; Sun Pengwen; Sun Wenbo; Guo Wenqiang

doi:10.19912/j.0254-0096.tynxb.2024-0104

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (5) : 515-521. DOI: 10.19912/j.0254-0096.tynxb.2024-0104

CALCULATION METHOD FOR FATIGUE CUMULATIVE DAMAGE OF WIND TURBINE BLADES UNDER UNCERTAIN WIND LOADS

Gao Jiajia^1,2, Sun Pengwen², Sun Wenbo³, Guo Wenqiang⁴

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Abstract

A calculation method for fatigue cumulative damage of wind turbine blades under uncertain wind load is proposed in this paper. Based on the measured wind field data, the maximum likelihood estimation method is used to fit and evaluate the effectiveness of various distribution functions, and the characterization method of cyclic load under uncertain wind load is explored. Taking the wind speed interval as the basic unit and considering the non-proportional multi-axial stress on the blades, the multi-axial fatigue cumulative damage theory is adopted to study the calculation method of fatigue cumulative damage during the measured period of wind speed. Combined with the distribution probability of the wind speed interval, the calculation model of long-term fatigue cumulative damage of blade is derived. Engineering examples show that this method can provide more accurate estimates of fatigue cumulative damage during the blade’s service life.

Key words

fatigue damage / probability distributions / wind turbine blades / uncertain wind load / multiaxial stress

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Gao Jiajia, Sun Pengwen, Sun Wenbo, Guo Wenqiang. CALCULATION METHOD FOR FATIGUE CUMULATIVE DAMAGE OF WIND TURBINE BLADES UNDER UNCERTAIN WIND LOADS[J]. Acta Energiae Solaris Sinica. 2025, 46(5): 515-521 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0104

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