风电机组行星轮系柔性齿圈疲劳寿命研究

为探究风电机组行星轮系柔性内齿圈在动态啮合力作用下的疲劳损伤规律，建立考虑内齿圈结构柔性的行星轮系动力学模型，运用瞬态动力学进行仿真计算得到内齿圈结构应力时域历程，并通过试验验证该动态应力仿真结果的正确性。运用雨流循环计数法及Goodman平均应力修正法得到对称循环应力，随后结合Miner线性损伤理论计算内齿圈结构的弯曲疲劳寿命，分析内齿圈结构变形引起应力变化对疲劳寿命的影响，探讨不同轮缘厚度、支撑数量及不同负载下内齿圈结构疲劳寿命的变化规律。结果表明：内齿圈疲劳寿命受到齿圈结构变形和轮齿变形的共同作用，轮缘越薄内齿圈结构变形越剧烈，各轮齿间寿命差距越大，两支撑间各轮齿疲劳寿命波动趋势越复杂；当齿圈柔性较大时，其最大应力由齿圈结构变形引起且疲劳破坏点由齿根向齿槽偏移，齿圈柔性较小时其疲劳寿命主要取决于轮齿变形。

RESEARCH ON FATIGUE LIFE OF FLEXIBLE GEAR RING OF PLANETARY GEAR TRAIN OF WIND TURBINE

In order to explore the fatigue damage law of the flexible inner ring gear of the planetary gear train of wind turbine under the action of dynamic meshing force, a dynamic model of the planetary gear train considering the structural flexibility of the inner ring gear was established. The time domain stress history of the inner ring gear structure was obtained by using transient dynamics simulation calculation, and the correctness of the dynamic stress simulation results was verified by experiments. The rain flow counting method is used to count the cyclic parameters of the stress spectrum, and Goodman method is used to correct the average stress. Then the bending fatigue life of the inner ring gear structure is calculated based on Miner linear damage theory. The influence of the stress change caused by the deformation of the inner ring gear structure on the fatigue life is analyzed. The change law of fatigue life of inner ring gear structure under support and different loads is analyzed. The results show that the fatigue life of the inner ring gear is affected by the deformation of the ring gear structure and the gear teeth. The thinner the flange is, the more severe the deformation of the inner ring gear structure is, the larger the life gap between the teeth is, and the more complex the fluctuation trend of the fatigue life of the teeth between the two supports is; When the flexibility of the ring gear is large, the maximum stress is caused by the deformation of the ring gear structure, and the fatigue failure point shifts from the root to the slot. When the flexibility of the ring gear is small, the fatigue life mainly depends on the deformation of the tooth.