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Optimum Design of Journal Bearings considering the Wear Rate  

임오강 (정회원·부산대학교 기계공학부 교수 iDOT연구원)
이왕진 (부산대학교 기계설비공학과)
Publication Information
Journal of the Computational Structural Engineering Institute of Korea / v.15, no.1, 2002 , pp. 155-164 More about this Journal
Abstract
The journal bearings use in machine parts which move relative to each other and those reduce friction and wear of journals. The journal bearings are designed to operate in the hydyodynamic lubrication regime, but elastohydrodynamic lubrication nay occur if the pressures are too high or the running speeds are too low at machine elements. It is the phenomenon that the lubricant film is broken and some parts of surfaces are in rolling contact, so that wear will increase in mixed lubrication regime. The purpose of this study is to minimize the wear rate of journal bearings for extending machine life. The wear mate in mixed lubricated regime is selected as objective function because most of wear of the journal bearings develops in elastohydrodynamic lubrication. The journal bearings we represented by a bearing radius, shaft radius, and bearing width, but the bearing radius only is selected as design variables due to a bearing radius has an influence on friction loss, stability limit velocity, and film parameter, which are used as constraints. For numerical calculation, PLBA, that is a class of the RQP algorithm, is used.
Keywords
optimum design; journal bearing; stability limit velocity; film parameter;
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