Abstract
Theoretical analyses of hydrodynamic fluid film bearings with different bearing profiles rely on solutions of the Reynolds equation. This paper presents an approach used for analysing the so‐called pocket bearings formed from a combination of offset circular bearing profiles. The results show that the variation of the dynamic bearing characteristics with different load inclinations for the pocket bearings is less than that for the elliptic bearing counterpart. It is shown that the natural frequencies as well as the critical speeds, and hence the vibrational behaviour, can also be significantly different for an industrial rotor supported by the different bearings.
Highlights
In order to increase productivity and reduce machine downtime, hydrodynamic bearings are frequently used to support high-speed rotating machinery where reliability, long running life, and minimum vibration levels are of primary concern
Simple circular bore journal bearings sometimes cause instability, which may result in catastrophic failure of the machinery
The theoretical analysis of hydrodynamic bearings relies on the solutions of Reynolds equation, a partial differential equation derived from the Navier-Stokes and continuity equations under certain simplifying assumptions [1]
Summary
In order to increase productivity and reduce machine downtime, hydrodynamic bearings are frequently used to support high-speed rotating machinery where reliability, long running life, and minimum vibration levels are of primary concern. Typical examples are elliptic bearings and tilting pad bearings, the former providing stabilizing preload and the latter minimizing the troublesome cross-coupled bearing forces Another bearing type, formed by a combination of offset circular bearing profiles and referred to as a pocket bearing, is sometimes used in machinery such as turbogenerators. In order to minimise the computational effort, in transient response analyses, some further simplifications such as infinitely short or long bearing approximations are frequently used [2]. Improvements to these techniques to achieve better solution accuracy using more complicated yet still manageable approaches have been developed [3]. This paper illustrates the approach used to obtain solutions for these pocket bearings
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