Interactive Mechanisms of Sliding-Surface Bearings.
Research and development rept.,
DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD
Pagination or Media Count:
This report adapts the theory of hydrodynamic lubrication to include surface roughness effects and asperity interactions. This theory becomes a means of studying the behavior of sliding-surface bearings in transition from hydrodynamic into mixed lubrication. A model problem, in the form of a crowned tilt-pad bearing with longitudinal roughness, was solved. In treating the model problem, end-leakage was neglected and a constant lubricant viscosity was assumed. Use of numerical computational methods could readily remove these restrictions. In real operating environments of ship components and shipboard machinery, the lubrication process is made more complex by thermoelastohydrodynamic effects and the likely occurrence of film striation. Because these complicated phenomena are only qualitatively understood, no adequate or comprehensive method exists for designing critical machine components such as face seals, elastomeric sterntube bearings, rudder stock, diving plane bearings, and main shaft thrust bearings. This report is part of a comprehensive plan to develop a better understanding of the interactive wear mechanisms of sliding surfaces. The theoretical basis is the application of Reynolds equation to the mixed lubrication regime. A closed-form solution of Reynolds equation applied to a crowned tilt-pad thrust bearing in transition from the hydrodynamic to the mixed lubrication region is presented to demonstrate some of the principles of this approach. The concepts developed are applicable to a wide variety of bearings and seals.
- Lubricants and Hydraulic Fluids
- Machinery and Tools