Effect of Shell Surface Texture Depth on the Steady State Performance of Noncircular Two Lobe Gas Journal Bearings

Authors

1 Faculty of Eng Ardakan Uni

2 Faculty of Eng Meybod Uni

3 Department of Mechanical Engineering,Faculty of Shahid Sadoughi,Yazd Branch, Technical and Vocational University (TVU),Yazd

Abstract

Due to the increasing development of using gas journal bearings as a support for rotating components in different equipment, improving their performance has been the subject of many recent studies. Different geometric design of bearings by creating regular textures on the surfaces due to the development of new machining methods and lithography is the latest techniques proposed by lubrication researchers. In this study, the effects of cylindrical dimples depth on the steady-state performance of two lobe noncircular gas journal bearings are investigated. For this purpose, governing Reynolds equation is modified and analyzed by FEM due to changes in the thickness of the lubricant film in presence of the surface textures. Results indicate that the creation of shallow cylindrical textures on the lower lobe is more effective on the performance of the considered bearings. As the cylindrical textures deepen, especially at lower value of preload factor, load carrying capacity and energy dissipation of the gas lubricant decrease and the attitude angle of the rotor center shows an inverse trend. Also, in different preload or bearing noncircularity values, choosing the optimal depths of cylindrical textures enhances the performance parameters of investigated bearing support system.

Keywords

References

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Journal of Solid and Fluid Mechanics
Volume 11, Issue 6
January and February 2022
Pages 273-286

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