Influence of texture geometries on the performance parameters of hydrodynamic journal bearing

Abstract

The operating and geometric parameters of textures affect the static, dynamic, and stability performance characteristics of a journal-bearing system. The present work investigates the influence of spherical-, cylindrical-, triangular-, and kite-shaped textures on the performance parameters of a journal-bearing system. The flow of a lubricant is assumed to be Newtonian and iso-viscous. Reynold's equation governing the flow of a lubricant between the space in the bearing and the journal is solved by a finite-element method. The computed results indicate that the spherically textured journal bearing provides better improvement in the performance parameters vis-a-vis other textured bearings. In general, the effect of texture shapes is more pronounced at the aspect ratio of surface textures is 1.0.

Influence of surface textures on the dynamic stability and performance parameters of hydrodynamic two-lobe journal bearings

“…It is observed that the partially textured-II configuration of journal bearing provides significant enhancement in the value of critical mass of a journal false( M false¯ c false) vis-a-vis plain journal bearing. Similar kind of results is reported by Singh and Awasthi 38 for circular journal bearings. Further, the value of critical mass of a journal false( M false¯ c false) increases with the eccentricity ratio (ε).…”

“…Further, it is seen that the partially textured-II configuration of two-lobe journal bearing has the least value of whirl frequency ratio and thus, it is more stable as compared to other configurations. Singh and Awasthi 38,39 reported similar pattern of results in their published work for circular bearings. For a selected value of eccentricity ratio (ε) = 0.3, the value of F false¯ w i r l 2 for partially textured-II two-lobe journal bearing is 20.76% lower than partially textured-II configuration of circular journal bearing.…”

Effects of Texture Bottom Profile on Static and Dynamic Characteristics of Journal Bearings

“…In addition, Meng et al [33] carried out a calculative investigation to study the effects of simple rectangular texture and compound texture on the dynamic performance of journal bearings and found that locally distributed compound texture can increase the direct stiffness coefficients, damping coefficients, and critical speed of journal bearing. Recently, Singh and Awasthi [34,35] numerically investigated the effects of texture parameters (texture depth and its distribution) on the static, dynamic, and stability performances of journal bearings with cylindrical, spherical, triangular, and kite textures; the results show that the performance parameters were significantly improved when the texture distribution is in the pressure rising region of bearings.…”

Performance of textured spherical thrust hybrid bearing operating with shear thinning and piezoviscous lubricants

“…Since different geometric shapes of micro-dimples have been considered in this study, therefore, for the purpose of performance comparison, the surface density of each shape of micro-dimple on the surface of the spherical thrust bearing is considered to be the same as per the published literature. 31,33,34,61 To maintain the same surface density, the width of the square dimple is taken as follows: w ¯ d = π × radius .1em of .1em conical / spherical / circular .1em dimple false( r ¯ d false). Therefore, in the present study, the depth of dimples of all the geometric shapes taken in the present study is chosen as h ¯ d = 1.5 and the radius of circular, conical and spherical dimple is taken as r ¯ d = 0.1.…”

“…They found that the performance of the bearing greatly depends on the geometric shape of the micro-textures. Recently, Singh and Awasthi 34 numerically studied the influence of different texture shapes (triangular, cylindrical, spherical, and kite-shaped textures) on the performance of the hydrodynamic journal bearing using the FEM. They found that the spherical texture shape provides better performance as compared with other shapes by maximising load capacity and minimising friction coefficient.…”