考虑瓦块磨损的可倾瓦径向轴承-转子系统动态特性研究

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摘要针对含有瓦块磨损故障的可倾瓦径向轴承-转子系统润滑和振动特性耦合建模问题，考虑了瓦块磨损、转子与瓦块平摆振动和轴承混合润滑的影响，提出了可倾瓦径向轴承-转子系统的混合润滑动力学模型，研究了不同磨损率下转子振动特性和轴承润滑性能的动态响应，探明了转子偏心量、转速和预载荷系数等参数与磨损率的耦合作用对轴承-转子系统动态特性的影响。结果表明：转子在磨损瓦块位置的振动位移和振动加速度随磨损率的增加而增大；与无磨损轴承相比，磨损轴承的转子加速度峰值频率会额外激起转频的偶次倍频；多瓦块磨损会导致转子振动响应和轴承油膜压力显著增大。该研究结果可为可倾瓦径向轴承-转子系统的状态监测及故障识别提供理论参考依据。

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关键词 ：可倾瓦径向轴承-转子系统, 瓦块磨损, 动态特性, 混合润滑动力学

Abstract：Aiming at coupling modeling of lubrication and vibration characteristics for tilting pad journal-rotor systems with pad wear fault, an original mixed-lubrication dynamic model for the tilting pad journal bearing-rotor system is proposed considering the effects of pad wear, rotor and pad horizontal-rocking vibrations, and bearing mixed lubrication. The dynamic responses of the rotor vibration and the bearing lubrication under different wear rates are studied. The effects of different parameters (rotor eccentricity, rotating speed and preload factor, etc.) on the dynamic characteristics of the tilting pad journal bearing-rotor system with worn pads are evaluated. Compared to the bearing without worn pads, the acceleration peak frequency of the rotor for the bearing with worn pads excites the additional even harmonics of the rotating frequency. The occurrence of multi-pad wear can cause a significant increase in the vibration response of the rotor and the oil film pressure of the bearing. These results provide a theoretical basis for condition monitoring and fault identification of tilting pad bearing and rotor systems.

Key words： tilting pad journal bearing-rotor system pad wear dynamic characteristic mixed-lubrication dynamic

收稿日期: 2023-08-09 出版日期: 2024-06-15

引用本文:

章朝栋 1,2，余文念 1,2，张路 1,3. 考虑瓦块磨损的可倾瓦径向轴承-转子系统动态特性研究[J]. 振动与冲击, 2024, 43(11): 255-263.
ZHANG Chaodong1,2, YU Wennian1,2, ZHANG Lu1,3. Dynamic characteristics of tilting pad journal bearing-rotor system considering pad wear. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(11): 255-263.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2024/V43/I11/255

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