考虑轴弯曲的水润滑轴承液膜建模方法

Research on liquid film modeling method of water lubricated bearing considering shaft bending

为研究轴颈变形影响下的水润滑轴承液膜分布问题,以考虑轴颈变形的液膜膜厚方程为基础,依据轴系校中结果对忽略轴颈变形、考虑轴倾斜以及考虑轴弯曲3种处理方法下的膜厚分布进行对比;以考虑轴弯曲条件下的液膜模型为基准,进行水润滑轴承流固耦合计算,对忽略轴颈变形以及考虑轴倾斜产生的误差进行分析。研究结果表明,考虑轴弯曲的膜厚方程计算得出的液膜厚度分布更接近水膜实际情况。以轴弯曲模型为基准,则有忽略轴颈变形会导致液膜沿轴向分布偏离实际情况,将轴颈变形简化为轴线的倾斜会导致液膜压力大小产生误差,其中水膜最大压力误差为-14.57%~-26.54%(随载荷变化),水膜压力均值误差约在-20%左右。

In order to study the liquid film distribution of water lubricated bearing under the influence of journal deformation,based on the liquid film thickness equation considering journal deformation,and according to the shaft alignment results,the film thickness distribution under the three treatment methods of ignoring journal deformation,considering shaft inclination and considering shaft bending is compared;Based on the liquid film model considering shaft bending,the fluid structure coupling calculation of water lubricated bearing is carried out,and the errors caused by ignoring journal deformation and considering shaft inclination are analyzed.The results show that the liquid film thickness distribution calculated by the film thickness equation considering axial bending is closer to the actual situation of water film;Based on the shaft bending model,ignoring the journal deformation will lead to the deviation of the liquid film along the axial distribution from the actual situation,Simplifying the journal deformation as the inclination of the axis will lead to the error of the liquid film pressure,in which the maximum pressure error of the water film is-14.57%-26.54%(varying with the load),and the average error of the water film pressure is about-20%.