轴承润滑特性对船舶推进轴系校中的影响

  目的  分析主轴承的动力学与摩擦学特性以及其相互耦合关系。  方法  首先，利用子结构法建立轴承磨损试验台耦合摩擦特性的动力学模型；然后，通过该动力学模型计算得到轴承摩擦耗功和轴心轨迹并与实测结果进行比较，验证模型的正确性；最后，在该模型的基础上进行主轴承摩擦学和动力学的耦合分析。
  结果  结果显示，试验台的4个支撑轴承均处于液动润滑状态，被测轴承在上止点处于混合润滑状态；随着轴承间隙的增大，轴承试验台被测轴承最小油膜厚度先增大后减小，当间隙在20 μm左右时可以得到最佳润滑状态；相比非线性弹簧的油膜模型，采用EHD模型可得到精度更高的轴承载荷和摩擦功耗。  结论  研究结果可为轴承副的润滑性能设计和高精度建模提供理论指导。

The influence of bearing lubrication characteristics on marine propulsion shaft alignment

  Objectives  This paper studies the dynamic and tribological characteristics of the main journal bearing, and the coupling relationship between them.   Methods  First, a dynamic model of the coupling tribological properties of a bearing wear test bed is established using the substructure method. The friction power consumption and orbital paths of the bearing are then calculated and compared with the measured results to verify the accuracy of the model. Finally, based on the model, the dynamic and tribological coupling analyses of the bearing are carried out.
  Results  The results show that the four support bearings of the test bed are in a state of hydrodynamic lubrication, while the tested bearing is in a state of mixed lubrication at the top dead center. With the increase in radial clearance, the minimum oil film thickness of the tested bearing increases first and then decreases, and the most optimal lubrication state can be obtained when the tested bearing clearance is about 20 μm. Compared with the oil film model of a nonlinear spring, the elastohydrodynamic model can provide bearing load and friction power consumption results with higher accuracy.   Conclusions   The results of this study can provide theoretical guidance for the lubrication performance design and high-precision modeling of bearing pairs.