Abstract
This paper aims to develop the fatigue stress spectrum and predicted fatigue life of the endless winder sheave using finite element (FE) analysis, which is utilized in wind turbine lift. First, we identified the fatigue critical location (FCL) of endless winder sheave through a static FE analysis. And the lifting velocity was measured using the non-contact velocity dectector. Based on the measured lifting velocity and compressive loads by traction of endless winder sheave, the compressive load-angle of rotation history at the FCL was determined. According to the compressive load-angle of rotation time history, total 230 FE analyses were performed with the interval of the angle of rotation of 15°, we eventually obtained the fatigue stress spectrum at the FCL. These results were processed using the rainflow cycle counting and the Goodman equation. Finally, the fatigue life of sheave was evaluated using the linear damage cumulative rule.
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