Showing papers by "Satish C. Sharma published in 2003"

On The Stability Margin of Hole-Entry Hybrid Journal Bearings Considering Viscosity-Temperature Variation

Abstract: The present study describes the theoretical investigation into the stability margin of a constant flow valve compensated hole-entry hybrid journal bearing system considering the variation of viscosity due to temperature rise of the lubricant. The journal temperature is computed on the basis of average fluid-film temperature. The relevant governing equations are solved using a finite element method and a suitable iterative technique. The thermohydrostatic performance of symmetric and asymmetric hole-entry hybrid journal bearing configurations are studies. The results presented in the study indicate that the variation of viscosity due to temperature rise of the lubricant fluid-film affects the performance of hole-entry hybrid journal bearing system quite significantly.

Performance of Externally Pressurized Non-Recessed Roughened Journal Bearing System Operating with Non-Newtonian Lubricant

Abstract: The present work describes the static and dynamic performance of an orifice compensated hole-entry hybrid journal bearing system considering the combined influence of surface roughness and non-Newtonian behavior of the lubricant. The modified form of average Reynolds equation has been used for the solution of the lubricant flow field in the clearance space of a rough journal bearing system. The non-Newtonian lubricant has been assumed to obey the power law model. The effects of surface roughness parameter (Λ), variance ratio (V rj) and the surface orientations such as transverse, isotropic and longitudinal surface orientations on the performance characteristics of the bearing have been studied for various values of power law index (n). Scheduled for Presentation at the 58th Annual Meeting in New York City April 28–May 1, 2003