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Abstract
The influence of 3D surface roughness on the transient non-Newtonian response of a dynamically loaded journal bearing under mixed lubrication is studied. A study of the transient non-Newtonian response of a dynamically loaded journal bearing under mixed lubrication condition is performed including the effects of 3D surface roughness parameters such as roughness orientation and characteristics of surface roughness of opposing surfaces and the variation of fluid viscosity across and along the fluid-film thickness due to shear thinning and viscoelastic behavior of the lubricant. The Reynolds equation is modified to include the effects of surface roughness, viscosity variation across the fluid-film, and viscoelastic properties of the lubricant. The power law model and Maxwell's model are employed to characterize shear thinning and viscoelastic properties of the lubricant, respectively. The solution of the modified average Reynolds equation is obtained using a finite element method and appropriate iterative schemes. Results are presented for a journal bearing subjected to sinusoidal loading. The bearing transient response was found to be significantly affected by the characteristics of surface roughness of opposing surfaces. The bearing with stationary roughness was observed to have good load-carrying capacity.
Acknowledgments
Review led by Michael Khonsari