Linear stability analysis of hydrodynamic journal bearings under micropolar lubrication

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

doi:10.1016/j.triboint.2004.08.023

Cited by 64 publications

(53 citation statements)

References 22 publications

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“…Turaga et al [17] performed non-linear transient stability analysis to study the sub-synchronous whirl stability of a rigid rotor supported on two symmetric hydrodynamic bearings with rough surfaces subjected to a unidirectional constant load. Das et al [18] performed a linear stability analysis of hydrodynamic journal bearings under micropolar lubrication, in which dynamic characteristics like stiffness and damping coefficients, critical mass parameter, whirl ratio etc. were obtained with respect to micropolar parameters.…”

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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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 dynamic Reynolds equation for micropolar fluid lubrication of plane inclined slider bearings with squeezing effect is analysed by Naduvinamani et al [18]. Das et al [19] presented the stability characteristics of hydrodynamic journal bearings lubricated with micropolar fluids. Recently Dhawan and Verma [20] have analyzed the micropolar lubrication in non-circular hybrid journal bearing.…”

Section: Introductionmentioning

confidence: 99%

Combined Effects of Viscosity Variation and Surface Roughness on the Squeeze Film Lubrication of Journal Bearings with Micropolar Fluids

et al. 2014

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In this paper, a theoretical study of the combined effects of viscosity variation and surface roughness on the squeeze film performance of journal bearings lubricated with micropolar fluid is made. The modified averaged Reynolds equation for micropolar fluids accounting for the randomized surface roughness structure and variation of viscosity is mathematically derived. The Christensen's stochastic theory for hydrodynamic lubrication of rough surfaces is used to study the effect of two types of one dimensional surface roughness patterns on the squeeze film characteristics of a journal bearing with micropolar fluid. Closed form expressions for the mean pressure load carrying capacity are obtained for the infinitely short journal bearing. It is observed that, the transverse surface roughness pattern improves the squeeze film characteristics where as the adverse effects are observed for the one-dimensional longitudinal surface roughness pattern. The effect of variation of viscosity in micropolar fluid on the squeeze film characteristic of rough short journal bearings is analyzed.

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“…Matsumura et al [2] have also developed some micro dimples on aluminum plates. Tala Ighil et al [3] presented an analysis of cylindrical textured bearing and showed that the performance of bearing is influenced by textured surface.The dynamic characteristics of hydrodynamic journal bearings lubricated with micro polar fluids are presented by Das et al [4].The dynamic behavior of axial grooved journal bearings in terms of stiffness and damping coefficients of fluid film and stability are found by Roy and Laha [5].Brizmer and Kligerman have found that both load capacity and attitude angle of the journal bearings could be improved by using partial LST mode at low eccentricities [6].Li and Wang have investigated the influence of the radius of the dimples on the tribological performance of a journal bearing. Results showed that the friction coefficient increased with both the width and the height of bulges in the case of journal bearing under light and moderate loading conditions [7].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristics and Stability of Cylindrical Textured Journal Bearing

Ganji¹,

Kakoty²

2014

IJMECH

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Linear stability analysis of hydrodynamic journal bearings under micropolar lubrication

Cited by 64 publications

References 22 publications

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

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

Combined Effects of Viscosity Variation and Surface Roughness on the Squeeze Film Lubrication of Journal Bearings with Micropolar Fluids

Dynamic Characteristics and Stability of Cylindrical Textured Journal Bearing

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