Abstract
Fatigue of main bearing significantly affects the reliability of drivetrain system (DTS) and strongly depends on the DTS configuration. Main bearing failure rate is high for Three-Point Mount wind turbine within the designed life. In this study, a three-dimensional elastic DTS model are established and validated with field measurements. The predicted shaft moments and torque arm motions show good agreements with observations. A numerical pounding model of main bearing is then proposed to evaluate the load factor due to pounding. Finally, the formulas in ISO 281 for predicting main bearing rating life L10 are modified by introducing two new parameters: life ratio and load factor. The predicted rating life L10 matches well with the onsite records.
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