【摘要】 倾斜摇摆工况下,轴承承受载荷随时间变化,这必然会影响轴承支撑的转子系统的安全性与稳定性分析结果,仅通过稳态分析难以保证支撑轴承自身的安全性和可靠性.本文采用西安交通大学润滑理论与轴承研究所多年积累的转子轴承系统动力学分析软件DLAP(dynamic lubrication analysis program),求解包含瞬态项的Reynolds方程和黏温方程,得到了正常工况下椭圆瓦、错位瓦轴承关键的运行参数如最小油膜厚度、最大油膜压力、温升、功耗和流量,同时对比分析了摇摆工况下两种轴承的轴心轨迹和油膜压力的变化.此外,基于轴承刚度和阻尼的分段线性化假设,建立不同横摇角度的转子轴承模型,耦合求解两种轴承支撑的转子系统的动力学模型,采用特征值和特征向量,不平衡响应分析、稳定性分析和瞬态动力学分析等手段,研究轴系的稳定性和安全性,最终得出摇摆工况下椭圆瓦轴承和错位瓦轴承支撑的转子系统的动力学特性.更多还原

【Abstract】 Rolling condition, the bearing load is changed with time, which is bound to affect the safety and stability analysis results of the rotorbearing system. Only through the steady state analysis that is difficult to guarantee the security and reliability of the support bearing.In this paper, using a rotor-bearing system dynamic characteristics analysis software DLAP(dynamic lubrication analysis program)developed by the lubrication theory and Bearing Research Institute of Xi’an Jiao Tong University, solution of the Reynolds equation and the temperature viscosity equation. The key operating parameters of the elliptic and offset bearing such as the minimum oil film thickness, maximum oil film pressure, temperature rise, power dissipation and flow rate are obtained. At the same time, the axis orbit and the oil film pressure of the two kinds of bearings are compared and analyzed under rolling condition. In addition, based on the assumption of piecewise linearization of bearing stiffness and damping, the rotor-bearing model with different rolling angles was established. Coupled solution of the two kinds of rotor-bearing system dynamics model was presented. By means of eigenvalue and eigenvector, unbalance response analysis, stability analysis and transient dynamic analysis, the stability and safety of the rotor-bearing system are studied in detail. Finally, the dynamics characteristics of rotor system supported by ellipse and offset bearings under rolling conditions were obtained.更多还原