The maximum steel ball load of yaw and blade bearings is calculated under the cooperative action of axial force, radial force and overturning torque,and the axial and radial component of steel ball set load distribution are calculated according to Hertz contact theory, obtaining the actual load distribution of steel ball set by combination of the beth.The dynamic equivalent load and dynamic load rating of inner and outer raceway are calculated according to Lundberg - Palmgren theory, and the fatigue life of the yaw and blade bearings is got by calculating fatigue life of inner and outer rings.%计算了偏航、变桨轴承在轴向力、径向力和倾覆力矩共同作用下的最大钢球载荷,并根据Hertz接触理论计算了钢球组载荷分布的轴向和径向分量,将两者合成得到了钢球组的实际载荷分布,根据Lundberg-Palmgren理论,计算了内、外圈沟道的当量动载荷和额定动载荷,通过计算偏航、变桨轴承内、外圈的疲劳寿命得到整个轴承的疲劳寿命.
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