Abstract
The influences of external loads caused by wind fluctuation on the load distribution on the gear tooth flank and the planet load sharing are investigated. A whole system model is developed to analyze the wind turbine gearbox (WTG) consists of planetary gear sets. The model includes non-linear mesh stiffness of gears, non-linear stiffness of bearings and the flexibilities of housing, planet carriers and ring gears. Two models for different design loads are employed to quantify the effect of external loads acting on input shaft of the WTG on the load distribution of gears and the load sharing amongst the planets under the quasi-static conditions. The results of gear mesh misalignment, contact pattern, load distribution and load sharing are all different for comparing two models, and this leads the gear safety factor to be not same each other. In other words, the gear safety factor can be varied due to the difference of the design load. Therefore, the results state that it is appropriate to utilize 5 DOF fatigue load caused by wind fluctuation as well as the torque as the design load for designing the WTG.
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