Static and Dynamic Performance Characteristics of Orifice Compensated Hydrostatic Flexible Journal Bearings with Non-Newtonian Lubricants

Sharma, Satish C.; Jain, S. C.; Sinhasan, R.; Sah, P.L.

doi:10.1080/10402000108982454

Cited by 33 publications

(43 citation statements)

References 11 publications

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“…The non-linear relation between shear stress and shear strain rate of most of the polymerthickened oils or lubricants are adequately defined and characterized by the cubic law fluid model [11,12,[15][16][17][18][19]. The cubic law fluid model is defined in non-dimensional form by the following relations [11,15,18,29,34]:…”

Section: Cubic Law Fluid Modelmentioning

confidence: 99%

“…The effect of nonlinear behavior of lubricant on flexible bearing system was carried out by Sharma et al [12] They reported that the nonlinear behavior of lubricant defined by a cubic shear stress law and a power law alters the dynamic response of a bearing system. Nagaraju et al [14] studied the influence of roughness pattern on the performance of a hole entry hybrid journal bearing system lubricated with power law lubricant.…”

Section: Introductionmentioning

confidence: 99%

“…During the last few decades, many studies [11][12][13][14][15][16][17][18][19] have been carried out in the field of circular hydrostatic/hybrid bearings considering the non-Newtonian rheology of lubricants.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A study of 2-lobe symmetric hole entry hybrid journal bearing operating with non-Newtonian lubricant considering thermal effects

Kushare¹,

Sharma

2015

Tribology International

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Section: Cubic Law Fluid Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A study of 2-lobe symmetric hole entry hybrid journal bearing operating with non-Newtonian lubricant considering thermal effects

Kushare¹,

Sharma

2015

Tribology International

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“…To meet the specific requirements of industries to modern machine elements, lubricants blended with small amounts of long-chain polymer additives have proved to enhance load-carrying capacity, as well as a reduction in attitude angle and friction parameters [3][4][5][6][7][8]. However, all above mentioned studies of lubrication mechanisms assumed that the bearings surfaces are Nomenclature Ñ gradient operator (Á) differentiation w.r.t.…”

Section: Introductionmentioning

confidence: 99%

Linear Stability Analysis of a Rough Short Journal Bearing Lubricated with Non-Newtonian Fluids

et al. 2004

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On the basis of Stokes theory and the Christensen's stochastic model, the combined effects of couple stresses and surface roughness on the instability threshold of hydrodynamic rotor bearings are theoretically studied. The film pressure is solved from the generalized stochastic non-Newtonian Reynolds-type equation and applied to evaluate the equilibrium solution of a short journal bearing. By using the linear theory, the eight oil-film stiffness and damping coefficients as well as the vibrational stability boundary were determined. According to the results obtained, the presence of couple stresses accompanied with a longitudinal roughness provides an increase in the values of stiffness coefficients K XX , K XY and K YX as well as the damping coefficient C XX , and results in a higher stability threshold speed. Whereas, when compared to the smooth bearing lubricated with couple stress fluid, a decrease in the threshold speed is found in the case of transverse roughness.

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“…The maximum decrease in minimum fi lm thickness is found to be of the order of 51% with respect to the rigid bearing operating with Newtonian lubricant. Sharma et al 4 studied the combined effect of non-Newtonian lubricant behaviour and bearing shell fl exibility on the performance of an orifi ce compensated multirecess hydrostatic/hybrid journal bearing system. The computed results demonstrate that loss in bearing performance due to the pseudo-plastic effect of the non-Newtonian lubricant can be mitigated by a proper selection of parameter such as the deformation coeffi cient and non-linearity factor or power law index.…”

Section: Introductionmentioning

confidence: 99%

Non‐Newtonian and thermal effects in constant flow valve compensated symmetric hole‐entry hybrid journal bearing

Garg

Kumar

Sharda³

2007

Lubrication Science

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Every high speed machine, demanding high level of perfection, can operate successfully through a precise design of bearings. Such a design can be formulated after carefully studying both static and dynamic characteristics of the journal bearing. The present paper described the study of static and dynamic performance of a hole-entry hybrid journal bearing system compensated with constant fl ow valve restrictor by considering the combined infl uence of thermal effects and non-Newtonian behaviour of the lubricant. The variation of the viscosity due to the non-Newtonian behaviour of the lubricant and temperature rise has been considered in the study. The numerical solution of the generalized Reynolds equation governing the fl ow of the lubricant, having variable viscosity along with the energy and heat conduction equations, was obtained using fi nite element method. The nonNewtonian lubricant has been assumed to follow the cubic shear stress law. The study included the performance of a double row symmetric hole-entry hybrid journal bearing confi guration containing 12 holes per row. The results presented in this paper indicate that change in viscosity of lubricant affects the performance of the holeentry hybrid journal bearing system quite signifi cantly.

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Static and Dynamic Performance Characteristics of Orifice Compensated Hydrostatic Flexible Journal Bearings with Non-Newtonian Lubricants

Cited by 33 publications

References 11 publications

A study of 2-lobe symmetric hole entry hybrid journal bearing operating with non-Newtonian lubricant considering thermal effects

A study of 2-lobe symmetric hole entry hybrid journal bearing operating with non-Newtonian lubricant considering thermal effects

Linear Stability Analysis of a Rough Short Journal Bearing Lubricated with Non-Newtonian Fluids

Non‐Newtonian and thermal effects in constant flow valve compensated symmetric hole‐entry hybrid journal bearing

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