Effects of Preload, Speed and Eccentricity Ratio of Rotor on the Thermohydrodynamic Performance of Two Lobe Journal Bearings

Document Type : Research Article

Authors

1 Department of Mechanical Engineering, Yazd University, Yazd, Iran

2 Faculty of Engineering, Ardakan University, Ardakan, Iran

Abstract

Due to the growing use of oil journal bearings, as an effective support for the rotating
parts of industrial machines, analysis of their performance is of importance. The shear stresses and
the frictional forces, proportional to the speed of the lubricant layers in different points of the bearing
clearance space, causes variation in the temperature of the lubricant, journal and bearing shell. However
the bearing design parameters also have effects on the lubricant temperature. So, in the present work,
the effects of design parameters such as the journal speed and the preload factor of the noncircular lobe
journal bearing on the temperature variations which result in variation of the pressure distribution of the
lubricant as well as changes in the load carrying capacity and attitude angle of the noncircular two lobe
journal bearings are investigated. Then the bearing performance parameters are calculated using the final
thermal pressure distribution of lubricant. Comparing the performance of two lobe bearings, with the
thermal effects and without them, shows that the lubricant viscosity and the pressure distribution in the
bearings decreases by increasing the rotational velocity of the journal. Also the results indicate that the
effects of lubricant temperature changes on the bearing performance decreases by increasing the amount
of the bearing preload.

Keywords

Main Subjects

References

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Amirkabir Journal of Mechanical Engineering
Volume 49, Issue 4
March 2018
Pages 697-708

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