Influence of Wear on the Performance of Multirecess Hydrostatic Journal Bearing Operating With Micropolar Lubricant

Abstract

The objective of the present work is to study theoretically the influence of wear on the performance of four-pocket capillary-compensated hydrostatic journal bearing operating with micropolar lubricant. In the present study, the lubricant containing additives and contaminants is modeled as micropolar fluid. The modified Reynolds equation for micropolar lubricant is solved using finite element method along with capillary restrictor flow equation as a constraint together with appropriate boundary conditions. The performance characteristics of a capillary-compensated four-pocket worn hydrostatic journal bearing operating with micropolar lubricant have been presented for a wide range of values of nondimensional external load, wear depth parameter, and micropolar parameters. The simulated results have also been presented for two different loading arrangements. In arrangement I, the load line acts through centers of the pockets, whereas in arrangement II, the load line bisects the land between two pockets. The simulated results suggest that a bearing lubricated with lubricant having higher micropolar effect has better static and dynamic performance characteristics as compared with Newtonian lubricant but the bearing lubricated with lubricant having higher micropolar effect is predominantly affected by the wear vis a vis static characteristics parameters as compared with Newtonian lubricant for both loading arrangements. However, in the case of stiffness and damping coefficients, loading arrangement II shows a significant higher enhancement in the value of direct stiffness and damping coefficients in z-direction due to micropolar effect as compared with load arrangement I. And also, the effect of wear on stiffness and damping coefficients in z-direction for bearing operating with micropolar lubricant is of same order as Newtonian lubricant for the loading arrangement II. A similar behavior is observed for the case of stiffness and damping coefficients in x-direction for loading arrangement I.

Stability of a constant flow valve compensated multi‐recess conical hybrid journal bearing operating with micropolar lubricant

“…Geometric and operating parameters for conical journal bearing system. [7][8][9][13][14][15][16][17][18]20,19 Bearing aspect ratio (λ) 1 Figure 3. Variation of maximum fluid-film pressure (p max ) versus radial load W r À Á .…”

“…In recent years, many investigators [13][14][15][16][17] studied the effect of micropolar lubrication on the performance of different types of fluid-film bearings such as hydrodynamic journal bearing, step bearing and lobbed hydrodynamic bearing. The studies 18,19 dealt with the influence of micropolar lubrication on the performance of hydrostatic and hybrid journal bearing. The studies [13][14][15][16][17][18]20,19 indicate that the use of micropolar lubricant results in a significant enhancement in the performance of the bearing system vis-à-vis Newtonian lubricant.…”

“…The studies 18,19 dealt with the influence of micropolar lubrication on the performance of hydrostatic and hybrid journal bearing. The studies [13][14][15][16][17][18]20,19 indicate that the use of micropolar lubricant results in a significant enhancement in the performance of the bearing system vis-à-vis Newtonian lubricant.…”

Effect of Elasticity on Capillary Compensated Flexible Multi-recess Hydrostatic Journal Bearing Operating with Micropolar Lubricant

“…Nicodemus et al [21] studied the influence of wear on the performance of capillary compensated four pocket hydrostatic journal bearing operating with micropolar lubricant for two different loading arrangements. The study revealed the influence of wear on bearing static performance characteristics, which is significantly higher for a bearing lubricated with micropolar as compared to bearing lubricated with Newtonian lubricant.…”

Flow Criterion Research on Fluid in Hydrostatic Bearing from Laminar to Turbulent Transition

“…De Pellegrin, Dennis V.and Hargreaves, Douglas J. pointed out that it is that the bearing with constant external turbocharged prolonged the service life of the bearing and decreased the friction and wear ,and simulated the influence the size and shape of the groove have on the bearing performance [3]. Nicodemus, E. Rajasekharand Sharma, Satish C. studied the theoretical influence micro polar lubricants have on wear properties of hydrostatic bearing with 4-vessel and compensation of capillary resistor, simplified the lubricants with additive into micro polar fluid, and solved the flow equation and the Reynolds equation using the finite element method [4]. In 2001, M. Wen-qi, J. ji-hai, Z. Ke-ding, has numerically analyzed the characteristics of fluid flow in annular hydrostatic bearing considering variable viscosity and different working condition by the finite element method, obtained viscosity field distribution , and compared with in constant viscosity.…”