The effect of V-shape protruded and dimple textured on the load-carrying capacity and coefficient of friction of hydrodynamic journal bearing: A comparative numerical study

Abstract

The present comparative numerical study is between V-shape protruded, dimple textured, and untextured bearing. The performance parameters in terms of the load-carrying capacity and coefficient of friction are computed by solving governing Reynold’s equation of the lubricant fluid flow. The governing equation is solved by the finite element method by assuming that the fluid is Newtonian and isoviscous in nature. The effect of eccentricity ratios, texture distribution, texture heights, and texture depths are considered for the analysis in both textured bearings. From simulated results, the load-carrying capacity and coefficient of friction is found to be maximum for protruded textured bearing in full textured region and first half-textured region respectively as compared to untextured bearings. Finally, optimal operating and geometrical parameters of textured bearing is obtained by computing performance enhancement ratio, which is the ratio of the load-carrying capacity to the coefficient of friction. The maximum value of the performance enhancement ratio is found for protruded and dimple textured bearing in full texturing and second half-region corresponding to the eccentricity ratio of 0.8 and 0.6 respectively at texture height and depth of 0.4.

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

“…Lately, Filgueira Filho et al [20] experimentally analyzed the performances of textured journal bearings with chevron, saw tooth, oblong dimple, and aligned dimple and found that the chevron textured journal bearing exhibited smaller eccentricity under reasonable texture geometrical parameters. Besides, some researchers [21][22][23] also analyzed the influence of protruded and dimple textures on the loadcarrying capacity and friction of journal bearings and compared the results with that of smooth journal bearing.…”

Impact of partial surface waviness on the tribological performance of hydrodynamic journal bearing

“…As partial texturing improve the performance of the bearing as reported by various researchers, [28][29][30][31][32] hence the static performance parameters defined by bearing load capacity and friction coefficient are calculated for bearings with partial surface waviness in five different regions, namely 0-360 , 0-180 , 180-360 , 185-288 , and 288-339 , as illustrated in Figure 3a-d in circumferential, axial, and both directions. 31,32 The comparison of performance parameters has been done for different regions at various wavenumbers and wave amplitudes to get optimal results. The simulated results of partial surface waviness improve the performance of the bearing and also reduce the cost of manufacturing bearings with partial surface waviness as compared to full surface waviness by using methods such as selective laser melting (SLM), selective laser sintering (SLS), additive manufacturing process, and so forth.…”

“…Furthermore, some research looked into the effect of other surface morphologies of the bearing and journal on bearing performance. Khatri and Sharma, 28 Tala-Ighil and Fillon, 29 Uddin and Liu, 30 and, Sharma et al 31,32 investigated the effect of different texturing geometries and their placement in different regions on bearing performance. Kango et al 33 examined the effects of spherical texture and microgrooving on the friction coefficient and average temperature of journal bearings at low and high eccentricity ratios and found that the micro-grooving significantly lowers the friction coefficient and increases the average temperature in comparison to spherical texture.…”

“…[40][41][42][43] The simulated results from this study will help designers to design high-performance journal bearings. The Reynolds equation governing the lubricant flow in non-dimensional form considering laminar and incompressible iso-viscous flow is given by Tala-Ighil and Fillon 29 and Sharma et al 31,32…”

Optimization lubrication performance of journal bearings with microtexture

“…Meng et al (2021) pointed that a critical compound texture depth can improve the critical speed of bearing-rotor system. Sharma et al (2021) compared the bearing performance between V-shape protruded, dimple textured and untextured bearing. Hingawe and Bhore (2020) analyzed various texture bottom profiles: flat, triangle and curved for improving the hydrodynamic performance of moving parts.…”