Analysis of Journal Bearing Performance in Two Dimensions

Oghenekevwe J. Mabilogho ； Steven Odi-Owei

《Research Journal of Applied Sciences, Engineering and Technology》 13卷10期 (2016/11) Pp. 765-770

https://doi.org/10.19026/rjaset.13.3350

摘要

Most of the analysis that has been done on the Reynolds' equation which forms the basis for journal bearing performance utilized the simplified assumption due to mathematical complexity but this study aims at analyzing the Reynolds' equation using the full two dimensional form to find out the performance of the journal bearing without the assumption that the pressure gradient in one axis is negligible. This become necessary because machineries in industries rotate at a very high speed, carrying heavy load on the shaft so the shaft, no matter how perfectly aligned they are at assembly, become misaligned when subjected to these heavy loads and the hydrodynamic pressure is skewed towards the position of minimum film thickness. The pressure is distributed in two dimensions. Previous literature often made use of the long bearing approximation with pressure gradient along the axial direction taken as zero. To accurately predict the performance of journal bearings, the axial direction was taken into consideration in this study. Numerical methods were employed to analyze the two dimensional Reynolds' equation without vertical flow. Finite Element Method (FEM) and the Finite Difference Method (FDM) were used to find the nodal pressure and the nodal load capacity applying the half Sommerfeld's boundary condition. The maximum pressure obtained for the bearing considered was 2.3345MPa and the maximum load the bearing can support is 4.8912×10^4 N/m with various load distribution across the various nodes.

關鍵字

Finite difference ； finite element method ； journal bearing ； load capacity ； nodal pressure ； pressure distribution