Finite element analysis of elliptical bearings lubricated by a non-newtonian fluid

Tayal, S.P.; Sinhasan, R.; Singh, Devendra

doi:10.1016/0043-1648(82)90088-6

Cited by 28 publications

(22 citation statements)

References 6 publications

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“…A schematic of two-lobe four-pocket hybrid journal bearing is shown in Figure 1. Differential equation governing of pressure distribution of incompressible and viscous lubricant in the clearance space is presented by modified Reynolds equation in the nondimensional form expressed as [23][24][25]…”

Section: Discussionmentioning

confidence: 99%

“…However, some notable studies dealing with non-Newtonian lubricant behaviour are referred in the literature. [23][24][25][26][27][28][29]30,31 Tayal et al 23,24 used shear strain power law for hydrodynamic circular bearing and cubic shear stress law for elliptical hydrodynamic journal bearing to find out the effect of non-Newtonian fluid on the bearing performance characteristics. Sinhasan and Sah 25 used cubic shear stress to find out the performance characteristic of hydrostatic journal bearing operating with non-Newtonian fluid.…”

Section: Introductionmentioning

confidence: 99%

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Two-lobe geometrically imperfect hybrid journal bearing operating with power law lubricant

Jain

Sharma

2014

Proceedings of the Institution of Mechanical Engineers, Part J:

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The present paper investigates the influence of journal’s geometric imperfections on the performance of capillary compensated two-lobe hybrid journal bearing system. Different geometric imperfections of journal, viz. barrel, bellmouth and circumferential waviness have been included in the study. A parameter called offset factor has been included in the analysis which distinguishes between two lobe and circular journal bearing. Further, the Reynolds equation has been modified by using power law model in order to deal with non-Newtonian effect of the lubricant. The numerically simulated results indicate that non-circularity of bearing and barrel shape irregularity significantly increase the values of [Formula: see text] and [Formula: see text] by a factor 36.47, 51.34 and 18.52%, respectively, with respect to the base bearing (circular ideal journal bearing) operating with non-Newtonian lubricant.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Two-lobe geometrically imperfect hybrid journal bearing operating with power law lubricant

Jain

Sharma

2014

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…The authors observed that the operating load, ellipticity, L/D ratio and shaft flexibility significantly affect the limit of stable operation and reported that elliptical bearings are suitable for stiff and moderately flexible rotors. Tayal et al 5) investigated the effect of additive-fortified lubricants (behave as non Newtonian fluids) non-linear behavior on the performance characteristics of the finite width elliptical hydrodynamic journal bearing using cubic shear stress law. The finite element method with Galerkin's technique was used by the authors, to solve the Navier-Stokes equations (in cylindrical co-ordinates) that represents the flow field in the clearance space of a bearing using Newtonian fluids, and then the non-Newtonian effect was introduced by modifying the viscosity term for the model in each iterations.…”

Section: Fig 1 Schematic Diagram Of Elliptical Journal Bearingmentioning

confidence: 99%

Experimental Measurement of Oil Film Temperatures of Elliptical Journal Bearing Profile Using Different Grade Oils

Sehgal

2010

Tribology Online

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A significant variation in oil film temperature has been observed in hydrodynamic journal bearings. Here, a journal bearing test rig has been developed to measure the oil film temperature on the three circumferential planes of the journal bearing. Further, an elliptical journal bearing with D Imin = 65.2 mm, OD = 85 mm and L = 65 mm, C m = 200 m and C = 300 m has been designed and tested to access the temperature rise at oil bush interface with three grade oils namely Oil 1, Oil 2, and Oil 3 at loads = 200 N, 400 N, and 500 N and speeds = 3000, 3500, 4000 rpm at constant oil supply pressure. The results show that with increase in the load at constant speed and pressure, and with increase in speed at constant load and pressure, the oil film temperature increases in the central plane of both the lobes of the bearing for all the grade oils. The nature of the oil film temperature distribution along the circumference of the journal bearing has been observed very close to the oil film temperature distribution reported in the literature.

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“…After that many researchers Singh and Gupta [2,3], Tayal et al [4], Read and Flack [5], Crosby [6] have studied the thermal performance parameters along with stability analysis of non-circular journal bearing profiles (elliptical, two lobe, lemon bore, offset, multi lobe) using different numerical techniques to obtain the static and dynamic characteristics of these bearings by solving the Reynolds Equation either by applying Finite Difference Method or Finite Element Analysis. Basri and Gethin [7] have done theoretical analysis of the thermal behaviour of offset half, orthogonally displaced, three-lobe and four-lobe bearing geometries.…”

Section: Introductionmentioning

confidence: 99%

Experimental evaluation of lubricating oil film pressure and temperarture of elliptical non-circular journal bearing profile

Singla

Chauhan

2015

2015 2nd International Conference on Recent Advances in Engineering &Amp; Computational Sciences (RAECS)

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The elliptical non-circular journal profile bearings provides more thermal stability than the circular journal bearings. The present study evaluates the thermal performance parameters such as oil film pressure and temperature experimentally along the circumference of an elliptical journal bearing. The tests have been conducted on the specially designed Journal Bearing Test Rig which is capable of measuring both pressure and temperature simultaneously at nine different locations along the central periphery of the elliptical journal bearing. The experimental data is measured at a constant journal speed=2000 rpm and with a variable radial load ranging from 500 N to 2000 N in steps of 500 N is applied on the bearing. The lubricant used for the experimentation is HYDROL 32. The results shows that both oil film pressure and the temperature increases with the increase in applied radial load on the bearing at the constant speed. Experimentally, two positive pressure loops have been found along the elliptical circumference of the bearing which accounts for better thermal stability as it reduces the cavitation zone inside the bearing.

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Finite element analysis of elliptical bearings lubricated by a non-newtonian fluid

Cited by 28 publications

References 6 publications

Two-lobe geometrically imperfect hybrid journal bearing operating with power law lubricant

Two-lobe geometrically imperfect hybrid journal bearing operating with power law lubricant

Experimental Measurement of Oil Film Temperatures of Elliptical Journal Bearing Profile Using Different Grade Oils

Experimental evaluation of lubricating oil film pressure and temperarture of elliptical non-circular journal bearing profile

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