Optimization of Partially Textured Parallel Thrust Bearings with Square-Shaped Micro-Dimples

Abstract

In this study we attempt to find the optimum geometrical parameters of square-shaped micro-dimples imposed on parallel flat bearing surfaces, which give the best tribological performance, including the load capacity and the friction coefficient. An analytical solution of the Reynolds equation for the surfaces involving numerous dimples is presented, then considering the variations of the number of dimples as well as the dimple length, and the height ratios for a constant dimpled length, it is used to get the optimum value of the parameters. It is shown that despite the variations of different studied geometrical parameters, it seems the optimum value of these parameters remains nearly constant.

KEY WORDS:

• Surface Texturing
• Optimization
• Load Capacity
• Friction Coefficient

Acknowledgments

Presented at the STLE/ASME International Joint, ribology Conference, October 22-25, 2006, San Antonio, TX

Final manuscript approved February 4, 2007

Review led by Mike Khonsari

Notes

¹Since the studied surface length is kept constant in this study, regardless of the variations of either length ratio or number of dimples, the trend of variations of the average total pressure would be the same as the load capacity. This would allow us to use the term “load capacity” instead of “total average pressure” where we are discussing qualitative behavior of the total average pressure.