风力机传动链齿轮齿根疲劳裂纹扩展剩余寿命评估

Residual Life Evaluation of Gear Root Crack Growth in Driving Train of a Wind Turbine

在叶轮气动载荷模型、柔性传动链模型和齿根弯曲应力模型的基础上,建立了随机风速下风力机传动链齿轮齿根疲劳裂纹扩展剩余寿命计算模型,对不同风速下的齿根弯曲应力进行了计算,分析了随机载荷下裂纹的扩展速率.对1.5 MW风力机太阳轮齿根疲劳裂纹的扩展进行了分析.结果表明:风力机齿轮齿根疲劳裂纹扩展寿命主要受风载荷影响,且紧急制动等冲击对裂纹扩展后期的影响不可忽视.

A calculation model for the residual life of gear root crack growth in driving train of a wind turbine was established at random wind speed on the basis of the impeller aerodynamic load model, the flexible driving train model and the gear root bending stress model, based on which the crack growth rate under random loads could be analyzed by calculating the gear root bending stress at different wind speeds. An analysis was conducted on the gear root crack growth of the sun gear in a 1.5 MW wind turbine. Results show that the residual life of gear root crack growth in a wind turbine is mainly affected by the wind load. Besides, the impact caused by emergency braking during later period of the crack growth can not be ignored.