alexa A Numerical Analysis of Optimum Air Journal Bearings
ISSN: 2168-9873

Journal of Applied Mechanical Engineering
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Research Article

A Numerical Analysis of Optimum Air Journal Bearings

Lie KN1*, and Jerry C T Su2
1Department of Food and Environmental Sciences, University of Helsinki, FIN-00014 Helsinki, Finland
2Department of Biology, Faculty of Sciences and Arts, Mehmet Akif Ersoy University, TR-15030 Burdur, Turkey
Corresponding Author : Lie KN
Far East University
Tainan, 744, Taiwan ROC
E-mail: [email protected]
Received March 25, 2013; Accepted April 24, 2013; Published April 29, 2013
Citation: Lie KN, Su JCT (2013) A Numerical Analysis of Optimum Air Journal Bearings. J Appl Mech Eng 2:122. doi: 10.4172/2168-9873.1000122
Copyright: © 2013 Lie KN, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

The responses to changes of bearing length-to-diameter ratio and supply pressure of hybrid air journal bearings are investigated numerically for rotor dynamic instability. Different types of external pressure compensations, including multi-array of 1, 2, 3, 4, or 5-row orifice bearings and porous bearings, are analyzed to obtain more insight to optimum designs of journal bearings to improve the problem of whirl instability of rotor mass. The results show that the long porous bearings (L/D>1.0) in the higher rotation speeds (Λ>0.5) have higher threshold load capacities W before the onset of whirl instability and thus are more stable than orifice bearings. On the contrary, the short 5-row orifice bearings (L/D ≤ 1.0) are more stable than the porous bearing in the lower rotation speeds (0.1 ≤ Λ ≤ 0.5). The results also show that the change of supply pressure from Ps=2.0 to Ps=8.0 makes no difference to orifice bearing with whirl instability of rotor but that the porous bearing is the most stable for the lower supply pressure Ps=2.0 and becomes unstable as the supply pressure Ps increases in the higher rotation speeds (Λ>0.5).

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