Showing papers by "Satish C. Sharma published in 2006"
TL;DR: In this article, the analysis of a non-recessed worn hybrid journal bearing with orifice restrictors was performed using Newton-Raphson method, FEM is used for solving Reynolds equation governing the flow of lubricant in the bearing clearance space.
35 citations
TL;DR: In this article, the influence of transverse, isotropic and longitudinal roughness patterns on the performance of an orifice compensated hole-entry journal bearing configuration has been studied for the various values of surface roughness parameter (Λ), surface pattern parameter (γ) and bearing shell deformation coefficient (D ¯ c ).
27 citations
TL;DR: In this paper, a general solution to account the surface roughness and the cross-film viscosity variation of lubricant due to its non-Newtonian behavior and rise in fluid-film temperature for the analysis of fluidfilm bearings is presented.
Abstract: A general solution scheme to account the surface roughness and the cross-film viscosity variation of lubricant due to its non-Newtonian behavior and rise in fluid-film temperature for the analysis of fluid-film bearings is presented. The combined influence of surface roughness, non-Newtonian behavior of lubricant and thermal effects of the performance of hole-entry hybrid journal bearing system has been investigated. The surface roughness, especially stationary roughness (i.e. rough bearing and smooth journal) with transverse pattern was found to partially compensate the loss in load carrying capacity due to the thermal and/or non-Newtonian behavior of lubricant effects quite significantly. It limits 18.86% loss in load carrying capacity due to the thermal effect to only 1.6% and 33.99% loss due to the combined influence of non-Newtonian lubricant and thermal effect to 16.76%.Copyright © 2006 by ASME
20 citations
TL;DR: In this article, the performance of a double row symmetric hole-entry hybrid journal bearing configuration with 12 holes per row was investigated and the results showed that change in viscosity of lubricant and bearing flexibility affects the bearing design parameter, so the stability of rigid rotor also gets affected.
20 citations
TL;DR: In this article, an average Reynolds equation for flattened rough surfaces is expressed in terms of pressure and shear flow factors, and the flow factors have been computed by solving the conventional Reynolds equation using FEM on a model bearing of rough surfaces.
Abstract: The profile of a new rough surface continuously varies under a running-in condition. A small change in the distribution of the asperity heights can have a significant effect on the hydrodynamic lubrication performance as the film thickness varies. For a realistic understanding of the thin-film lubrication phenomenon, it becomes imperative to consider the effect of “running-in wear.” To consider its effect on the hydrodynamic lubrication performance of tribological elements using an average flow model approach, a theoretical simulative study of running-in wear and its effect on pressure and shear flow factors has been presented that is based on numerical flow simulation of isotropic flattened rough surfaces. An average Reynolds equation for flattened rough surfaces is expressed in terms of pressure and shear flow factors. The flow factors have been computed by solving the conventional Reynolds equation using FEM on a model bearing of rough surfaces for various stages of running-in wear. The computation is ...
3 citations
TL;DR: In this paper, the fracture parameters, stress intensity factor and T-stress are obtained for edge cracks aligned along the gradient in finite size elastically graded plates using the technique of boundary collocation.
Abstract: The fracture parameters, stress intensity factor and T-stress are obtained for edge cracks aligned along the gradient in finite size elastically graded plates using the technique of boundary collocation. A scheme for extending the recently derived crack tip stress field for elastically graded materials is proposed. Using this extended stress field, the fracture parameters are evaluated for edge cracks subjected to far field tension and three point bending. The results for far field tension agreed well with published theoretical results over a good range of elastic gradients. The maximum shear stress calculated over the entire domain of the cracked plate using boundary collocation agrees very well with that obtained from finite element analysis. The efficacy of the extended stress field in capturing the effects of the elastic gradient on the stresses and fracture parameters is thus established in this study.
3 citations