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国外文献 > 1.轴承 > 1. 基础理论与机制 > 动力学与稳定性

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标 题： A Computational Model for the Analysis of the Static Forced Performance of Self-Equalizing Tilting Pad Thrust Bearings
自平衡倾角垫推力轴承静态强迫性能分析的计算模型
作 者： Koosha, Rasool
San Andres, Luis
关键词： fluid film thrust bearings  [流体薄膜推力轴承]
tilting pad  [ 倾斜垫片]
misalignment  [ 不对中]
self-equalizing  [ 自平衡的]
thermo-elastohydrodynamic analysis  [ 热弹性流体动力学分析]
出版年： 2020
期刊名： Journal of engineering for gas turbines and power: Transactions of the ASME
燃气轮机与动力工程杂志：美国机械工程师学会会刊
年卷期： 2020, vol.142, no.10
摘 要： While failure analyses in the archival literature report thrust collar misalignment as a major cause of collapse in oil lubricated thrust bearings (TB), a self-equalizing tilting pad thrust bearing (TPTB) improves operation reliability by adjusting its pads to account for thrust collar tilt. This paper describes a kinematics model for the equalizing mechanism integrated into an existing thermo-elastohydrodynamic (TEHD) analysis tool to deliver load performance predictions for self-equalizing TPTBs. The analysis considers the actual leveling plates geometric model as obtained from a solids modeling commercial software and accounts for the sliding friction forces acting at the contact points of the leveling plates and the rolling friction at their pivots. Further, a Hertz contact analysis model uses the predicted forces to deliver a peak pressure and deformation over the contact area between the leveling plates. Next, this paper presents predictions for an example self-equalizing TPTB operating with a thrust collar static misalignment phi =0.01deg. The bearing 126mm in outer diameter has six pads, operates at 4 krpm (26m/s maximum surface speed) and under a specific load/pad ranging from 0.5 to 3.5MPa. Compared to a nonequalizing TPTB, a self-equalizing TPTB operates with up to 50% larger minimum film thickness and about 1/2 largest elastic deformation. Friction forces acting at the contact points of the leveling plates show a significant effect on the performance of the pad leveling system as they reduce the film clearance and increase a pad peak pressure. Predictions from the Hertz contact analysis agree with those from a commercial finite element analysis tool and show a significantly large peak pressure at the contact points of the leveling plates (>0.9GPa) when the bearing supports a 3MPa/pad specific load. This paper stresses the importance of conducting a comprehensive multiple-pad analysis to accurately evaluate the performance and reliable operation of self-equalizing TPTBs.

尽管文献中的失效分析指出，油润滑推力轴承（TB）中推力环偏移是导致失效的主要原因，但自平衡式倾斜垫推力轴承（TPTB）通过调整其垫片以补偿推力环的倾斜，从而提高了运行可靠性。本文描述了一种将自平衡机制集成到现有热弹性流体动力学（TEHD）分析工具中的运动学模型，用于预测自平衡TPTB的载荷性能。该分析采用从商用实体建模软件中获得的实际调平板几何模型，并考虑了调平板接触点处的滑动摩擦力以及支点处的滚动摩擦力。此外，利用赫兹接触分析模型，基于预测的力值计算出调平板接触区域内的峰值压力和变形。最后，本文针对一个推力环静态偏移角φ=0.01°的自平衡TPTB进行了性能预测。该轴承外径为126毫米，具有六个垫片，转速为4转/分钟（最大表面速度26米/秒），在0.5至3.5兆帕的特定载荷/垫片条件下运行。与非自平衡TPTB相比，自平衡TPTB的最小膜厚可增加高达50%，弹性变形也大约增大一半。在调平板接触点处作用的摩擦力对垫片调平系统的性能有显著影响，因为它们会减小膜间隙并提高垫片峰值压力。赫兹接触分析的预测结果与商用有限元分析工具的结果一致，当轴承每块垫片承受3兆帕的特定载荷时，调平板接触点处的峰值压力显著增大（>0.9GPa）。本文强调了开展全面多垫片分析的重要性，以准确评估自平衡TPTB的性能和可靠运行。
中文内容为网络AI翻译，专业术语未必准确，仅供参考。

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