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Analysis of tilting-pad thrust bearing static instability and lubrication performance under the bistability

机译：双稳态下可倾瓦推力轴承静不稳定性及润滑性能分析

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Purpose - The purpose of this paper is to analyze the problems of tilting-pad thrust bearing static instability and lubrication performance under static bistability. Design/methodology/approach - The static equilibrium state of tilting-pad thrust bearing is analyzed, and key parameters are extracted from the general lubrication model. Then, a distribution area of bearing static equilibrium points is achieved by solving the model. The area is divided into three sub-areas which represent monostabillity, bistability and instability, and an unstable boundary of the area is discovered. By these findings, a reversible lubrication failure phenomenon is explained. A calculation method is proposed to obtain bearing lubrication performance under the bistability. Findings - The variation of working conditions can lead to migration of unstable boundary and static instability. After resuming the working conditions, unstable boundary will resume in situ, and the bearing will operate steadily again. Moreover, there is a big difference between the two groups of lubrication performance solutions under the bistability. Practical implications - The static stability acceptance test of tilting-pad thrust bearing should be implemented under start-stop, accidental excitation and other conditions before service to prevent such lubrication failure phenomenon. Moreover, fulcrum position of the bearing pad should be kept away from the bistable area. Originality/value - This paper has preliminarily revealed a static instability mechanism of tilting-pad thrust bearing, analyzed bistability lubrication performance and proposed some suggestions to improve the bearing stability.
机译：目的-本文的目的是分析可倾瓦止推轴承静态不稳定性和静态双稳态下的润滑性能问题。设计/方法/方法-分析了可倾瓦推力轴承的静态平衡状态，并从通用润滑模型中提取了关键参数。然后，通过求解模型获得了承载静态平衡点的分布区域。该区域分为代表单稳态，双稳态和不稳定性的三个子区域，并发现该区域的边界不稳定。通过这些发现，解释了可逆的润滑失效现象。提出了一种在双稳态下获得轴承润滑性能的计算方法。调查结果-工作条件的变化会导致边界不稳定和静态不稳定的迁移。恢复工作条件后，不稳定的边界将恢复原位，轴承将再次稳定运行。此外，在双稳态下，两组润滑性能解决方案之间存在很大差异。实际意义-维修前应在起停，意外励磁和其他条件下进行可倾瓦推力轴承的静态稳定性验收测试，以防止出现这种润滑失效现象。此外，轴承垫的支点位置应远离双稳态区域。创意/价值-本文初步揭示了可倾瓦推力轴承的静态失稳机理，分析了双稳态润滑性能，并提出了一些改善轴承稳定性的建议。

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