| Summary: | 碩士 === 國立臺灣科技大學 === 機械工程系 === 89 === This study is primarily aimed at analyzing the lubricated performance for a finite-width submerged oil journal bearing with Gauss-distribution surface roughness. It is necessary to consider the thermohydrodynamic effect simultaneously to investigate and find out several important characteristics, maximum pressure, load capacity, friction coefficient, and attitude angle, precisely. Furthermore it is observed that indicating the dynamic trajectory of the journal center and the stability in whole system.
The finite difference method is used to be as the processive means and to solve three major equations at the same time, averaged Reynolds equation, energy equation, and heat transfer equation, in order to derive the pressure profile and temperature contour of oil film and solid bearing. Then employ the numerical technique, fourth-order Runge-Kutta method, to solve the motion equation of a bearing system and obtain the locus of the journal center.
By the operation of a speedy computer, the result of simulation reveals that a lot of factors, surface roughness pattern, bearing size, thermohydrodynamic model, various eccentricity, and external load type, have a significant influence on the lubricated performance and stability of the system. Therefore traditional assumes of the isothermal theory and the smooth surface have not been able to use.
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