Comparative Study on the Effect of Recesses on Conical Hybrid Journal Bearing Compensated with CFV under Micropolar Fluid Lubrication

Rana, Narendra Kumar; Gautam, Satyam Shivam; Verma, Suresh

doi:10.2474/trol.11.474

Cited by 6 publications

(3 citation statements)

References 16 publications

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“…The stability of the rigid rotor supported by six recessed hybrid bearings with orifice compensation and influence of restrictor design parameters and eccentricity on it are studied by Chen et al [13]. Rana et al [14,15] have analyzed the performance of four and six pockets conical hybrid journal bearing. The performances of conical hybrid journal bearing with constant flow valve for micropolar lubricant for different load arrangements have not been exploited by the researchers.…”

Section: Introductionmentioning

confidence: 99%

Stiffness and damping characteristics of conical multirecess hybrid journal bearing for different load arrangements

2019

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This paper presents the theoretical analysis on the effect of two different load arrangements for a conical multirecess hybrid journal bearing. For this analysis constant flow valve restrictors are used under micropolar lubricant for different semi cone angles. The modified Reynolds equation using micropolar fluid flow on the conical surface has been solved with the use of FEM and Galerkin's technique applying proper boundary conditions in the iterative scheme. The study suggests that the configuration LA I can be a better alternative as compared to LA II for different semi-cone angles and external load in terms of bearing characteristics. Keywords CFV restrictor • Conical bearing • Micropolar lubrication • FEM List of symbols a b Axial bearing land width, mm A p Area of pocket, mm 2 A b Area of bearing, mm 2 A e Area of each element c Radial clearance, mm C ij Fluid film damping coefficients (N/mm 2), (i, j = x, z) D m Mean journal diameter of conical shaft, mm e Eccentricity, mm F Fluid film reaction F x , F z Fluid film reaction component, N h Fluid film thickness, mm l m ,l Bearing characteristic length L Bearing length, mm M Journal mass, kg p s Supply pressure, N/mm 2 Q Lubricant flow (mm 3 /s) R j Journal radius, mm r Radial coordinate S ij Fluid film stiffness coefficients (N/mm),

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Section: Introductionmentioning

confidence: 99%

Stiffness and damping characteristics of conical multirecess hybrid journal bearing for different load arrangements

2019

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“…Also, Bansal et al [22] highlighted elastic distortion effects on stability of micropolar lubricated hydrodynamic bearing and their results indicated that increase in flexibility causes decrease in stability. Various studies concerning the theory of micropolar lubricant and effects of micropolar parameters on performance and stability of journal bearings have also been reported in literature [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

A Study on the Influence of Combined Elastic and Micropolar Effects on Hole-Entry Hybrid Journal Bearing

Budheeja

Verma

2018

Tribology Online

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The influence of bearing elasticity and micropolar parameters of micropolar lubricant on the performance and stability margin of a smooth hole-entry hybrid journal bearing system compensated with capillary restrictor has been presented in this paper. Isothermal conditions are assumed for the operation of journal bearing system. Finite element method is used to obtain the coupled solution of modified Reynold's equation and three dimensional elasticity equations. Performance characteristics are calculated in terms of minimum fluid film thickness, maximum fluid film pressure, attitude angle, critical journal mass, threshold speed and frequency of whirl for various values of design parameters like external load, restrictor design parameter, coefficient of deformation and micropolar parameters of the micropolar lubricant. The results presented in this study may be quite useful in the selection of the appropriate combination of the restrictor design parameter and elasticity of bearing so as to ensure the design of a stable bearing operating with micropolar lubricant. There exist an optimum value of restrictor design parameter (C S2) where the performance characteristics and stability margin are maximum for rigid as well as flexible bearing operating with Newtonian and micropolar lubricants.

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“…Verma et al [11,12] analyzed and compared performance characteristics of flexible multirecess capillary and CFV compensated hydrostatic journal bearing operating with micropolar lubricant and observed a significant influence of bearing shell flexibility and micropolar effect on bearing performance. Recent studies on journal bearings operating with micropolar lubricant by Ram et al [13] and Rana et al [14] demonstrated the influence of micropolar parameters on performance characteristics of journal bearings.…”

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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Comparative Study on the Effect of Recesses on Conical Hybrid Journal Bearing Compensated with CFV under Micropolar Fluid Lubrication

Cited by 6 publications

References 16 publications

Stiffness and damping characteristics of conical multirecess hybrid journal bearing for different load arrangements

Stiffness and damping characteristics of conical multirecess hybrid journal bearing for different load arrangements

A Study on the Influence of Combined Elastic and Micropolar Effects on Hole-Entry Hybrid Journal Bearing

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

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