저어널 베어링의 윤활효과 분석

Abstract

The thickness of adsorbed molecular layers is the most critical factor in studying thin film lubrication, and it is the most essential parameter that distinguishes thin film from thick film lubrication analysis. The thin film between the shaft part and journal bearing surface within a very narrow gap was considered. The general Reynolds equation has been derived for calculating thin film lubrication parameters affecting the performance of circular journal bearing. Investigation of load carrying capacity, shear stress and its force for the journal bearing under the consideration of adsorbed layer thickness has been carried out. A Reynolds equation for journal bearing is used in this paper for its analysis, and it is discussed using FDM(finite difference method) of central difference scheme. The most dominant parameters such as eccentricity and attitude angle are used for discussing the load carrying capacity of the circular journal bearing. The results reported in this paper should be applied to analysis of the journal bearing with different lubrication factors. The steady state analysis of journal bearing is conducted using the Reynolds model under thin film lubrication with reynolds conditions. By the FDM analysis of a journal bearing, several parameters such as pressure, load carrying capacity and shear stress of the bearing can be obtained. Also these results can be stored in sequential data file for a latter analysis. After all, their distribution can be displayed and analyzed easily by using the matlab GUI technique. The load carrying capability of the journal bearing is observed for the specified operating conditions and this work could be helpful for an understanding and research for the mechanism of the thin film lubrication behaviors.

Keywords: finite difference method, journal bearing, lubrication, pressure distribution, Reynolds condition, Sommerfeld condition