Effect of Creating Surface Textures and Using Nanofluid Lubricant on the Dynamic Stability of Noncircular Journal Bearings

Authors

1 Department of Mechanical Engineering Ardakan University

2 PhD graduate from Yazd University

3 Member of the Mechanical Engineering Department, Ardakan University

4 Member of the Mechanical Engineering Department, University of Meybod

10.22044/jsfm.2025.15887.3948

Abstract

Any change in the lubricant structure and the geometry of the components effectively impacts the performance of rotor-bearings supports as one of the common parts of industrial machines. Today, with technological advancements, the producing of nanofluids and textured surfaces are developed. In the present study, the effects of cylindrical textures depth and applying the titanium dioxide nanoparticles on the performance of hydrodynamic noncircular two lobe journal bearings are evaluated. For this purpose, after deriving the governing Reynolds equation, a linear dynamic analysis model is employed to investigate the stability condition of the bearing. Finally, various parameters such as the load-carrying capacity, attitude angle, critical mass and the whirl frequency ratio are examined as steady-state and dynamic performance characteristics of the system under the influence of cylindrical textures properties and the concentration of TiO_2 nanoparticles. The results indicate an improvement in the performance characteristics of the bearing system when textures are created with optimized depth and surface location. Additionally, increasing the concentration of nanoparticles shows an enhancement in the steady-state performance of the system. Overall, the results indicate the possibility of optimizing and enhancing the performance of the two lobe bearings using surface textures and nanoparticle concentrations in a principled manner.

Keywords

Main Subjects

References

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Journal of Solid and Fluid Mechanics
Volume 15, Issue 2
May and June 2025
Pages 135-151

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