A Study of Misaligned Micropolar Lubricated Membrane Compensated Hybrid Journal Bearing System

Abstract

The present work aims to analytically study the performance of misaligned four-pocket, membrane compensated, hybrid journal bearing system operating with micropolar lubricant. In the present study, the flow characteristic of the lubricating oil containing additives and contaminants has been modeled using Erigen’s micropolar theory. The journal misalignment which may occur as a result of noncentral loading, improper assembly, shaft deflection due to elasticity and thermal distortions, etc. has been accounted for in the present study by defining a pair of misalignment parameters in vertical and horizontal directions (i.e., δ and σ).The modified Reynolds equation governing the flow of micropolar lubricant in the clearance space of a misaligned bearing has been solved using FEM and Newton Raphson method along with the appropriate boundary conditions. The numerically simulated results suggest that the effect of journal misalignment is to cause degradation in bearing performance, whereas the influence of micropolar effect of lubricant is to enhance the bearing performance. Therefore, it is imperative to account for the effect of misalignment and lubricant behavior during the design process in order to generate accurate bearing characteristics data.

Analysis of externally pressurized multirecess conical hybrid journal bearing system using micropolar lubricant

“…Therefore, Newton-Raphson iterative technique is used to solve the non-linear modified Reynolds equation (24). The detailed description of this iterative technique has been presented in Sharma et al 18 The unit INDAT reads the input data and the 2D mesh of the bearing system. Then, unit FTHIK calculates the fluid film thickness at nodal points for the tentative values of the journal center position.…”

“…His study indicates that the stiffness of these bearings can be increased using variable-flow restrictors rather than fixed restrictors. In recent times, many studies [16][17][18] were performed to investigate the performance of an externally pressurized journal bearing compensating with membrane restrictor. These studies indicate that the performance of bearing system in terms of fluid film stiffness and damping coefficients significantly improves with membrane restrictor.…”

“…These studies indicate that the performance of bearing system in terms of fluid film stiffness and damping coefficients significantly improves with membrane restrictor. The studies [5][6][7][8][9][10][11][12][13][14][15][16][17][18] are restricted up to Newtonian lubricant.…”

“…The use of micropolar fluids results in an increase in load-carrying capacity and temperature, but the reduction in the value of coefficient of friction and side leakage flow as compared to Newtonian fluids. 18,[25][26][27][28][30][31][32][33] Naduvinamani and Santosh 34 carried out a study dealing with micropolar fluid squeeze film lubrication of finite porous journal bearing. Wang et al 35 carried out a study of journal bearing system with combined influence of micropolar lubrication and cavitations effect.…”

Thermohydrostatic analysis of hybrid journal bearing compensated by constant flow valve operating with micropolar lubricant

“…They underlined the utility of micropolar lubrication for the semicone angle of 10 and 20 in conical hybrid bearing. Sharma et al 18 studied misalignment and micropolarity effects on performance of hybrid journal bearing. Rajput and Sharma 19 studied micropolar lubrication of membrane restrictor compensated conical hydrostatic journal bearing.…”