贫油工况下滑动轴承弹流润滑特性分析

Analysis of Elasto-hydrodynamic Lubrication Characteristics of Journal Bearings Under Starved Lubrication

随着风力发电机组的功率增加,滑动轴承在风电齿轮箱中的使用优势逐渐突显。当风力发电机组内的轴承润滑系统堵塞或供油不足时,滑动轴承将长期处于贫油润滑状态。为了研究滑动轴承的贫油润滑特性,基于Reynolds方程和Reynolds边界条件,考虑油膜压力作用下轴套的弹性变形,建立了贫油润滑状态下滑动轴承的计算模型;对比了计入弹性变形和不计入弹性变形的滑动轴承贫油润滑性能;分析了轴套弹性模量和供油量对滑动轴承贫油润滑性能的影响。结果表明,计入弹性变形后的最小油膜厚度位置位于轴套两侧,更加符合实际情况;随着轴套材料弹性模量的增加,轴颈偏心率逐渐减小,最大油膜压力逐渐增加,最小油膜厚度逐渐增加;随着供油量的增加,轴颈偏心率逐渐减小,最大油膜压力逐渐降低,最小油膜厚度逐渐增加。

With the gradual increasing of wind turbine power,the advantages of journal bearings in wind turbine gearboxes are gradually prominent.When the lubrication system is blocked or the oil supply is insuffi⁃cient,the journal bearing will be in the starved lubrication for a long time.In order to study the starved lubrica⁃tion characteristics of journal bearings,based on the Reynolds equation and Reynolds boundary conditions,con⁃sidering the elastic deformation of sleeves,the calculation model of journal bearings in the starved lubrication is established.The lubrication properties of journal bearings with and without elastic deformation are compared,and the influence of elastic modulus and oil supply on journal bearing properties under the starved lubrication is analyzed.The results of analysis indicate that the minimum oil film thickness considering the elastic deformation is on both sides of the bearing bush,which is more in line with the actual situation.With the increasing of elastic modulus of sleeves,the eccentricity of journals decreases,the maximum oil film pressure increases,and the min⁃imum oil film thickness increases.With the increasing of oil supply,the eccentricity of journals decreases gradu⁃ally,the maximum oil film pressure decreases,and the minimum oil film thickness increases gradually.