不同润滑油黏度下风机齿轮箱轴承磨损特性分析

Analysis on Wear Characteristics of Bearings in Wind Turbine Gearbox Under Oil Lubricating with Different Viscosities

建立了风机齿轮箱轴承动力学模型,基于弹性流体动力润滑理论和Hertz接触理论优化求解接触半宽,并建立考虑油膜润滑的滚动轴承磨损数值仿真模型以得到轴承磨损量。以1.5 MW风机齿轮箱轴承NCF2968为例,计算40℃下轴承润滑油运动黏度分别为320,460,680 mm^2/s时轴承各零件的磨损量,得出其中最适合轴承运行的润滑油黏度为460 mm^2/s。并对优化前后的轴承磨损数值仿真模型进行求解,优化后的模型更符合实际工况。

The dynamic model for bearings in wind turbine gearbox is established to solve load of bearings. Based on elastohydrodynamic lubrication theory and Hertz contact theory,the solving parameters of contact half width are optimized. Finally,the numerical simulation model for wear of rolling bearings is established,considering the thickness of oil film. Taking the bearings NCF2968 in 1. 5 MW wind turbine gearbox as examples,the wear amount of each part of bearings is calculated under 40 ℃ when the kinematic viscosities of lubricating oil is 320,460,680 mm^2/s respectively.The 460 mm^2/s is most suitable for bearing operation. The numerical simulation model for wear of the bearings before and after optimization are solved,the model after optimization is more in accordance with actual operating condition.