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- W2559701530 abstract "Abstract The concept of hydrodynamic tilting-pad bearings was proposed at the beginning of the 20 th century, to support and guide shafts in machinery. The principle of hydrodynamic lubrication was discovered two decades before the realisation of the first tilting-pad bearing. The performance of this kind of bearings was predicted applying isothermal theory. Nowadays, the isothermal modelling is still used for a quick design of these supports but, the operating conditions being more and more severe, the thermal and deformation effects have to be considered for hydrodynamic bearing analyses. 1. Introduction The concept of tilting-pad bearing was proposed independently, and almost simultaneously, by A. Kingsbury [1, 2] in USA and A.G.M. Michell [3, 4] in Australia, at the beginning of the 20 th century. In 1904, Kingsbury proposed to replace expensive rolling bearings by tilting-pad thrust bearings on a large electric motor with a vertical shaft; tests shown that the operating temperature was higher than that of an electric motor equipped with a ball-bearing. At the same time, Michell presented an analysis of plane inclined slider bearings of finite width. He probably designed the first tilting-pad thrust bearing in service; it was installed on a centrifugal pump on the Murray River, in Australia. Unlike fixed geometry thrust bearings for which the geometry is optimum for specific operating conditions, the tilting-pad thrust bearings self adapt the pad inclination (film shape) to load or speed variations. This principle was also applied to the journal bearings which support radial loads. The tilting-pad journal bearings are widely employed in turbomachinery because of their excellent dynamic performance, when they are geometrically preloaded. In usual applications, the number of pads varies generally from 3 to 6 for the journal bearings and from 6 to 12 for the thrust bearings. The pads are free to tilt around their pivot which is either a line contact or a spherical contact: the wear at the pivot can be significant for high load operation, thus reducing the preload factor of journal bearings, i.e. the dynamic characteristics. To avoid this problem, the fluid [5] and the flexible pivot [6] have been proposed. The presence of the flexible pivot eliminates the phenomenon of pad fluttering which occurs on unloaded pads of low preloaded tilting-pad journal bearings [7]. Hydrodynamic bearings nowadays are often subjected to severe operating conditions leading to a large dissipated power in the lubricated contact. The thermal effects which are known to play an important role in lubrication cannot be ignored. In addition, the thermal and mechanical deformations of bearing elements should be considered in the analysis of the bearing behaviour. This paper describes these effects in the case of tilting-pad thrust and journal bearings." @default.
- W2559701530 created "2016-12-08" @default.
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- W2559701530 date "2005-01-01" @default.
- W2559701530 modified "2023-09-27" @default.
- W2559701530 title "Thermal and Deformation Effects on Tilting-Pad Thrust and Journal Bearing Performance" @default.
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