Abstract
The orthogonal experiment design method is used based on analysis of lubrication of hydrodynamic journal bearing．The effect of structural parameters ( bearing diameter，wide diameter ratio and clearance ratio) and operating parameters ( linear velocity and specific pressure) on lubrication performance of hydrodynamic journal bearings is studied． The results show that the linear velocity and specific pressure have significant influence on maximum oil film pressure of the bearings．The influence of specific pressure and bearing diameter on load capacity of the bearings is significant．The bearing diameter and linear velocity have significant influence on discharge flow of the bearings．The linear velocity has the most significant influence on friction power loss of the bearings when the low viscosity lubricant is used， and the clearance ratio，specific pressure and bearing diameter have a great influence on friction power loss of the bearings when the high viscosity lubricant is used．
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