| Wind power is a clean renewable energy with widespread application. Speed-increase gearbox is the key parts of the large wind turbine generator, its working life is longer, and reliability higher, than common machines. The strength and dynamic characteristics of its gear transmission system has been studied in this paper.Firstly, based on the current gear strength calculation method, the effect of the friction between teeth on the gear stress has been analyzed and calculated. The result shows:①the effect on the bending fatigue stress at gear root under increase-speed transmission is different with deduce-speed transmission. The driven gear' bending stress can be decreased, driving gear's be increased, especially the driving big gear in increase-speed transmission, by the flank frictional force.②the effect on gear face contact fatigue stress under increase-speed transmission is same with deduce-speed transmission. The stress may increase 1%～10%, more than 5% when f≥0.09.Then the new gear strength calculation formulas have been given, and according it one stage planetary gear transmission added two stage fixed axis cylindrical gear transmission has been designed for speed-increase gearbox of wind turbine.Lastly, the dynamic model of the gear transmission system has been established by lumped-parameter method, and its differential movement equation has set up by the influence coefficient method; the natural frequency and main vibration mode of the planetary gear system and the whole transmission system has been calculated, and according it vibration modes of planetary gear are classed into two types, torsion mode and planet mode, then the influence of the rotational inertias on the whole transmission system's natural frequency has been analyzed; the dynamic response excited by the time-varying mesh stiffness and gear errors has been computed using SIMULINK.
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