倾斜推力垫从水动力到边界状态的转变

Q3 Engineering
J.H.M. Ledocq
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引用次数: 0

摘要

推力垫的流体动力润滑的基本问题现在已经很好地理解了,特别是在一个简单的情况下,平坦倾斜垫休息在一个平坦的比赛。复杂的理论已经发展出来,将无限宽的矩形垫的解扩展到有限的扇形垫的情况。然而,从流体动力状态到边界状态的过渡问题更为复杂,并且比径向轴承的简单问题得到的关注较少。此外,在任何理论工作中,枢轴都隐含地假设位于主动摩擦面内;这个轴的周向偏移量是唯一需要考虑的变量。对两种润滑状态下施加在垫上的所有力的平衡状态的分析表明,径向枢轴的轴向偏移有影响。设计了一种特殊的摩擦计,用于研究过渡现象的规律。考虑了支点位置对流体动力摩擦的影响,但最重要的结果是研究了倾斜条件对过渡临界点的影响。该阈值的准确定义和检测是基于一种特殊开发的电气方法。这些结果在等效矩形垫方面进行了总结,并得出了有趣的结论,从而可以推导出垫及其支撑的最佳布局。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The transition from hydrodynamic to boundary regime of tilting thrust pads

The fundamental problem of the hydrodynamic lubrication of thrust pads is now well understood, especially in the simple case of flat tilting pads resting on a flat race. Sophisticated theories1 have been developed to extend the solution for a rectangular pad of infinite width to the case of finite, sector shaped pads. The problem of transition from the hydrodynamic regime to the boundary regime is more intricate, however, and has been given less attention than the simple problem for radial bearings. Furthermore, in any theoretical work, the pivoting axis is implicitly assumed to be located within the active friction face; the circumferential offset of this axis is the only variable taken into account2. The analysis of the state of equilibrium of all the forces applied to the pad in both lubrication regimes has suggested that the axial offset of the radial pivot has an influence. A special tribometer has been designed and used to investigate the laws governing the transition phenomena3. The influence of the pivot location on the fluid hydrodynamic friction has been considered but the most significant results have been obtained by investigating the influence of the tilting conditions on the transition critical point. The accurate definition and detection of this threshold is based upon a specially developed electrical method. These results are summarized in terms of the equivalent rectangular pad and lead to interesting conclusions allowing an optimum layout of the pad and its support to be derived.

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来源期刊
Mocaxue Xuebao/Tribology
Mocaxue Xuebao/Tribology Engineering-Mechanical Engineering
CiteScore
1.90
自引率
0.00%
发文量
3489
期刊介绍: As the most authoritative comprehensive science periodical covering all branches of Tribology in China, “Tribology” deals with various academic, technological, and engineering topics in the interdisciplinary subjects of Mechanical Science and Technology, Materials Science and Engineering, Physics, Chemistry, Mechanics, etc. It covers new achievements in the fundamental, applied fundamental, and applied researches in Tribology, reflects the development and direction of Tribology at home and abroad, helps to find and train young scholars, speeds up extensive academic exchange, promotes the development of Tribology subject, and serves for the development of economy and society.
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