On the steady-state performance of misaligned hydrodynamic journal bearings lubricated with micropolar fluids

Das, Subrata; Guha, Sujoy K.; Chattopadhyay, A.K.

doi:10.1016/s0301-679x(01)00065-2

Cited by 78 publications

(43 citation statements)

References 16 publications

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“…In this study, the modified Reynolds equation, under micropolar lubrication with the useful lubrication assumptions for an incompressible fluid flow and the porous bearing assumption [8], will be as follows:…”

Section: Appendix Amentioning

confidence: 99%

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Bifurcation and chaos for porous squeeze film damper mounted rotor–bearing system lubricated with micropolar fluid

Chang‐Jian

Kuo

2009

Nonlinear Dyn

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This study presents a dynamic analysis of a flexible rotor supported by two porous squeeze micropolar fluid-film journal bearings with nonlinear suspension. The dynamics of the rotor center and bearing center are studied. The analysis of the rotorbearing system is investigated under the assumptions of non-Newtonian fluid and a short bearing approximation. The spatial displacements in the horizontal and vertical directions are considered for various nondimensional speed ratios. The dynamic equations are solved using the Runge-Kutta method. The methods of analysis employed in this study are inclusive of the dynamic trajectories of the rotor center and bearing center, power spectra, Poincaré maps, and bifurcation diagrams. The maximum Lyapunov exponent analysis is also used to identify the onset of chaotic motion. The numerical results show that the stability of the dynamic system varies with the nondimensional speed ratios, the nondimensional parameter, and permeability. The modeling results obtained by using the method proposed in this paper can be employed to predict the

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Section: Appendix Amentioning

confidence: 99%

“…In 1996, Lin [7] performed the analysis of hydrodynamic lubrication of journal bearing, considering both the micropolar lubricants and the three-dimensional irregularities. In 2002, Das et al [8] studied the performance of the steady-state characteristics of hydrodynamic journal bearings, with the consideration of misalignment.…”

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confidence: 99%

Bifurcation and chaos for porous squeeze film damper mounted rotor–bearing system lubricated with micropolar fluid

Chang‐Jian

Kuo

2009

Nonlinear Dyn

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“…Since then many studies pertaining to micropolar lubricants are reported in literature. For example, the effect of micropolar fluids on the lubrication performance of misaligned hydrodynamic journal bearings was investigated by Das et al [5] and it was observed that load carrying capacity increases in case of micropolar lubricant. Wang et al [6] studied the lubricating effectiveness of micropolar fluids in a dynamically loaded journal bearing and found that micropolar fluids yield a higher oil film pressure and oil thickness compared to Newtonian fluids when subjected to same dynamic loading conditions.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Linear and Nonlinear Stability Analysis of Hybrid Journal Bearing Operating with Micropolar Lubricant

Budheeja

Verma

2017

Tribology Online

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The present study discusses the effect of micropolar parameters on the stability of symmetric hole-entry hybrid journal bearing system compensated with capillary restrictor. Finite element method has been used to solve the modified Reynolds equation for the flow of micropolar lubricant through the bearing. The linearized and nonlinear equations of motion are solved numerically using fourth order Runge-Kutta Method at each integration time step. Solution of these equations provides the locus of moving journal center and the journal trajectories are plotted with the help of a computer program. A Routh-Hurwitz stability criterion has been applied to calculate the critical mass of the journal to analyze the stability of journal. A comparative analysis for linear and nonlinear models considering Newtonian and micropolar lubricants has been done. The results obtained indicate that micropolar parameters affect the performance as well as the stability margin of the hybrid journal bearing system considerably and nonlinear analysis provides quick response as compared to linear one.

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“…They concluded that the micropolar fluid exhibits better stability in comparison with Newtonian fluid. In their extended work, Das et al [12] presented the performance of misaligned hydrodynamic journal bearings lubricated with micropolar fluids. Wang et al [13] have studied the lubricating effectiveness of micropolar fluids in a dynamically loaded hydrodynamic journal bearing.…”

Section: Introductionmentioning

confidence: 99%

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

Verma

Kumar

Gupta

2015

J. Inst. Eng. India Ser. C

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This paper presents a theoretical study of the effects of bearing shell deformation upon the performance characteristics of a capillary compensated multi-recess hydrostatic journal bearing system operating with micropolar lubricant. The finite element method has been used to solve the modified Reynolds' equation governing the micropolar lubricant flow in the bearing and the three dimensional elasticity equations governing the displacement field in the bearing shell. The elasto-hydrostatic performance characteristics of the bearing are presented for various values of micropolar parameters (l m and N 2 ) and for a wide range of the deformation coefficient C d which takes into account the flexibility of the bearing shell. The computed results indicate that the influence of the bearing shell flexibility is quite significant on the performance characteristics of recessed hydrostatic journal bearing system operating with micropolar lubricant.

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On the steady-state performance of misaligned hydrodynamic journal bearings lubricated with micropolar fluids

Cited by 78 publications

References 16 publications

Bifurcation and chaos for porous squeeze film damper mounted rotor–bearing system lubricated with micropolar fluid

Bifurcation and chaos for porous squeeze film damper mounted rotor–bearing system lubricated with micropolar fluid

A Comparative Linear and Nonlinear Stability Analysis of Hybrid Journal Bearing Operating with Micropolar Lubricant

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

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