浮环轴承非线性耦合动力润滑特性

Research on nonlinear fluid-solid interaction dynamic lubrication in floating ring bearings

针对浮环轴承-柔性转子结构的某型微型燃机实验结果的分析,结合浮环轴承非线性耦合动力润滑的机理研究,进一步研究与探讨了浮环轴承流固耦合润滑的非线性行为.给出了浮环轴承存在的五种典型非线性振动的频率特征,阐明了转子临界区域工频振动特征与转子涡动频率谐波振动特征的区别与联系,同时也明确了相应的振动抑制或消除的措施及方法.根据单膜润滑油膜承载能力及涡动速度的解析表达式,论证了浮环轴承半速涡动的频率特征及其稳定性.试验证明,浮环内、外油膜半速涡动与油膜振荡现象的涡动比接近于0.5与0.3,并且理论与实验具有很好的一致性.这为浮环轴承的设计及性能研究提供了相应理论与实验的依据.

An experiment of floating gine was presented. Some nonlinear beh were studied. And nonlinear frequency ring bearings and flexible rotor in a micro turbo-enaviors of fluid-solid interaction in floating bearings characteristics of five typical vibrations in floating ring bearings were presented. Furthermore, the difference and correlation between power frequency characteristic in critical speed range and whirl frequency harmonic response characteristic were illustrated. At the same time, the method to control vibration and to eliminate whirl was described. Based on the analytical expressions of load capacity and whirl frequency in single oil film lubrication bearings, the stability of floating ring bearings was analyzed. The experiment shows that the whirl ratios of outer and inner oil film in floating ring bearings approach 0.5 and 0.3, respectively, in squeezing vibration, which matches the theoretical analysis considerably. This research provides experimental and theoretical evidence for future floating ring bearings design and performance research.