Static and stability analysis of partial slip texture multi-lobe journal bearings

Rao, T. V. V. L. N.; Rani, Ahmad Majdi Abdul; Mohamed, Norani Muti; Ya, H. H.; Awang, Mokhtar; Hashim, Fakhruldin Mohd

doi:10.1177/1350650119882834

Cited by 11 publications

(7 citation statements)

References 36 publications

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“…Their study shows that heterogeneous slip/ no-slip region load carrying capacity and pressure distribution improve with the increase in roughness parameter. Rao et al [101] studied the variation of stiffness and damping coefficient for different slip-texture journal bearing profiles. They observed that stiffness and damping coefficient decrease with an increase in the eccentricity ratio.…”

Section: Journal Bearing With Texturementioning

confidence: 99%

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Implication of Surface Texture and Slip on Hydrodynamic Fluid Film Bearings: A Comprehensive Survey

et al. 2020

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Numerous published studies on the non-wettable surfaces with surface texture and slip conditions have been reviewed comprehensively to evaluate the performance of hydrodynamic bearings from last two decades. The recent numerical and experimental studies have been explored to observe the individual and combined influence of surface texture and slip. A variety of texture shapes and optimized slip zone profiles have also been discussed in this article. It has been observed from the literature that a suitable combination of modified slip and the conventional no-slip zone is effective in improving dynamic and static performance of hydrodynamic bearings. Many experimental studies also revealed that micro-scale textures are significantly capable of improving the tribological performance. Moreover, slip boundary condition is more beneficial at low and medium eccentricity ratios.

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Section: Journal Bearing With Texturementioning

confidence: 99%

“…• Journal bearing with slip boundary condition and random surface roughness give an improvement in load carrying capacity and maximum pressure [100]. • Partial slip and texture region significantly influence the dynamic stability of bearing [101].…”

Section: Journal Bearing With Texturementioning

confidence: 99%

Implication of Surface Texture and Slip on Hydrodynamic Fluid Film Bearings: A Comprehensive Survey

et al. 2020

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“…[13][14][15][16][17][18]21] Other studies [1][2] concentrated only on the effect of slip on plain journal bearings or two-lobe bearings. [19] Also, to add to the above gaps, Recently, Das and roy [22] investigated the influence of non-Newtonian lubricant on multilobe bearings, and Rao et al [27] investigated the effect of partial slip with texturing on multilobe bearings using Newtonian fluids. Thus, to the evidence relating, no research has focused on the combined influence of non-Newtonian lubricant and wall-slip on the static and stability properties of the lemon-bearing.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of a Lemon Bearing Operating with Non-Newtonian Lubricant Considering Slip between the Sliding Surfaces

A¹,

Raghunandana.²

2022

Eng. Sci.

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With the addition of additives, lubricating fluid begins to behave non-linearly. Besides that, the emergence of ultra-highspeed machines with highly polished surfaces causes slip between the sliding surfaces, violating the no-slip boundary condition. The current novel research work looks at the performance of the bearing while considering the combined effect of the non-Newtonian and wall-slip impact of the lubricant. Furthermore, the model developed can account for the influences of slip-lengths acting in orthogonal directions at the solid-fluid interface of both sliding surfaces. This innovative model produces more realistic steady-state and dynamic performance results than the classic Reynolds hypothesis. The finite difference method is employed to determine the pressure developed using the successive over-relaxation approach. The findings divulge that the occurrence of wall-slip on the journal surface significantly impacts bearing performance. The journal center trajectories that determine the system's stability are estimated using non-linear transient analysis. The findings reveal that, at a power-law index of 0.75 and slip-length of 0.2, dimensionless pressure increases by 10%, resulting in higher loadcarrying capacity. The flow rate is increased by 6.5%, and above all, the stability region has grown by about 19.45%.

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“…They concluded that to achieve a high load-carrying capacity, a higher preload factor is required. Rao et al 10 analyzed the effect of partial-slip textures on various multi-lobe bearing configurations (2-axial grooves, 2-lobe, 3-lobe, and offset journal bearings) and predicted that among them, two-lobe showed an improvement in the load-carrying capacity and linear stability.…”

Section: Introductionmentioning

confidence: 99%

Performance of rough surface hydrodynamic circular and multi-lobe journal bearings in turbulent regimes

Narwat

Kumar

Singh

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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This article deals with the steady and dynamic performance analysis of rough surface circular and multi-lobe journal bearings operating with non-Newtonian lubricant in turbulent regimes. The numerical solution of Reynold's equation was obtained using the finite element method. To account for surface roughness, the Patir and Cheng model was used, and fluid turbulent behavior was modeled using the turbulent theory as proposed by Ng and Pan. The non-Newtonian behavior of the lubricant is presented by the Rabinowitsch fluid model, and JFO boundary conditions are used to solve Reynold's equation, considering gaseous cavitation. The bearing with micro-roughness has been considered in numerical analysis and transverse roughness has been reported to improve bearing performance indices. Among the different bearing design configurations, the two-lobe bearing configuration provides significantly improves the minimum film thickness, hydrodynamic pressure, and dynamic parameters. The presence of turbulent flow and transverse surface roughness produces a synergistic effect that enhances the minimum film thickness, stiffness, and damping parameters of journal bearings. This study provides a detailed comparison between various bearing designs and recommends the use of two-lobe bearings for high-speed applications.

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Static and stability analysis of partial slip texture multi-lobe journal bearings

Cited by 11 publications

References 36 publications

Implication of Surface Texture and Slip on Hydrodynamic Fluid Film Bearings: A Comprehensive Survey

Implication of Surface Texture and Slip on Hydrodynamic Fluid Film Bearings: A Comprehensive Survey

Stability Analysis of a Lemon Bearing Operating with Non-Newtonian Lubricant Considering Slip between the Sliding Surfaces

Performance of rough surface hydrodynamic circular and multi-lobe journal bearings in turbulent regimes

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