Stability Analysis of Hydrodynamic Journal Bearing with Surface Texture

Abstract

In order to study the influence of surface texture on the stability of hydrodynamic journal bearing, the Reynolds equation is solved by partial derivative method, the influence of surface texture on the equivalent stiffness, square of whirl frequency ratio and dimensionless critical mass under different cylindrical dimple diameter, depth and area ratio is discussed. The results show that for partial texture along the circumferential direction on the bearing with fixed eccentricity, the dimple depth has much influence on the stability of the bearing. When the dimensionless dimple depth is greater than 10, with the increase of dimple depth, the smaller the dimple diameter is, the larger the dimensionless critical mass is, which is higher than that of untextured bearing. The dimensionless critical mass is highest when the dimple area ratio is 12.56%, but the effect of dimple area ratio on bearing stability is not significant. When the texture area ratio is 12.56%, the dimensionless critical mass is the highest. However, due to the small difference of the improvement, the effect of texture area ratio (> 12.56%) on bearing stability is not significant. The effect of texture parameters on the bearing stability with different width-diameter ratio is various. When the width-diameter ratio is small, the texture will reduce the stability, while for bearings with large width-diameter ratio, the stability can be improved.