Steady-state and stability characteristics of hydrostatic two-layered porous oil journal bearings

Saha, Nimai Chandra; Majumdar, B. C.

doi:10.1177/135065010421800205

Cited by 25 publications

(16 citation statements)

References 8 publications

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“…[1], [2], and [12] are solved simultaneously with appropriate boundary conditions with _ e D _ f D 0. The finite difference method with SOR scheme is used for solving the differential equations.…”

Section: Nonlinear Methodsmentioning

confidence: 99%

Rigid Rotor Stability Analysis on Finite Hydrostatic Double-Layer Porous Oil Journal Bearing with Velocity Slip

Kumar

Samanta

Murmu

2015

Tribology Transactions

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A theoretical investigation has been carried out for stability characteristics of a finite hydrostatic double-layer porous oil journal bearing considering the effect of Beavers-Joseph velocity slip at the porous film interface. A linearized perturbation method has been used to obtain the threshold of stability in terms of critical mass parameter. The effect of slip parameters, eccentricity ratios, bearing feeding parameter, and slenderness ratio on the stability is investigated. Furthermore, nonlinear transient analysis is carried out to determine the system stability by tracing the journal center locus. Several trajectories of the journal center locus have been obtained for different operating conditions and are depicted with the help of graphics.

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Section: Nonlinear Methodsmentioning

confidence: 99%

Rigid Rotor Stability Analysis on Finite Hydrostatic Double-Layer Porous Oil Journal Bearing with Velocity Slip

Kumar

Samanta

Murmu

2015

Tribology Transactions

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“…With the help of appropriate boundary conditions [8,9], equations (2.1-2.3) are solved by finitedifference method with Gauss-Sedial iterative procedure using the over-relaxation scheme. The following convergence criterion has been set to achieve the accuracy of pressure values:…”

Section: Numerical Solution Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Few literature [8][9] have been reported so far dealing with the performance of two-layered porous bearings. Saha and Majumder [8] presented the static characteristics and stability characteristics of two-layered hydrostatic porous oil journal bearings without the effect of the slip. Kumar et al [9] presented a theoretical analysis on the finite double-layered hydrostatic porous oil journal bearing, where the steady-state characteristics are analysed including slip effect.…”

Section: Introductionmentioning

confidence: 99%

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Comparison between steady-state characteristics of isotropic and anisotropic doubled-layered porous journal bearings under coupled stress lubrication

Some

Guha

2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract.A theoretical comparison between the steady-state characteristics of isotropic and anisotropic finite hydrostatic double-layered porous journal bearings dealing with the effects of slip flow at the fine porous layer-film interface and percolation of additives into pores under the coupled stress fluid lubrication is presented. Based on the Beavers-Joseph's criterion for slip flow, the modified Reynolds equation applicable to finite porous journal bearings lubricated with coupled stress fluids have been derived. The governing equations for flow in the coarse and fine layers of porous medium incorporating the percolation of polar additives of lubricant and the modified Reynolds equation are solved simultaneously using finite difference method satisfying appropriate boundary conditions to obtain the steady-state performance characteristics for both isotropic and anisotropic porous bearing. The comparisons between isotropic and anisotropic doubled-layered porous bearings for various steady-state characteristics are exhibited in the form of graphs which may be useful for design of such bearings.

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“…For eliminating these difficulties, several researchers [8,9] have suggested that two-layered porous bearings are better than the conventional porous bearings, because double-layered porous bearings restrict the seepage into the porous walls. In the double-layered structure, a major pressure drop occurs across the thin fine layer, though its thickness is very less compared to the coarse layer [10,11]. Heinzl [8] and Okano [9] considered that the double-layered porous bearings had increased stability.…”

Section: Introductionmentioning

confidence: 99%

Effect of slip and percolation of polar additives of coupled-stress lubricant on the steady-state characteristics of double-layered porous journal bearings

Some

Guha

2018

J Braz. Soc. Mech. Sci. Eng.

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A theoretical study has been made into the steady-state solution of externally pressurized double-layered porous journal bearings lubricated with coupled-stress fluid with tangential velocity slip at the fine porous interface. The analysis takes into account the tangential velocity slip based on the Beavers-Joseph criterion. Moreover, the present study includes the effects of percolation of the polar additives (microstructures) into the coarse and fine layers of a porous medium. The most general modified Reynolds type equation has been derived for a porous journal bearing lubricated with coupled stress fluids. The governing equations are derived for flow in the coarse and fine layers of the porous medium incorporating the percolation of polar additives of the lubricant. The effects of slip, speed parameter, percolation factor and coupled-stress parameter on the static characteristics in terms of load capacity, attitude angle, side leakage and frictional parameter were investigated. The results are exhibited in the form of graphs.

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Steady-state and stability characteristics of hydrostatic two-layered porous oil journal bearings

Cited by 25 publications

References 8 publications

Rigid Rotor Stability Analysis on Finite Hydrostatic Double-Layer Porous Oil Journal Bearing with Velocity Slip

Rigid Rotor Stability Analysis on Finite Hydrostatic Double-Layer Porous Oil Journal Bearing with Velocity Slip

Comparison between steady-state characteristics of isotropic and anisotropic doubled-layered porous journal bearings under coupled stress lubrication

Effect of slip and percolation of polar additives of coupled-stress lubricant on the steady-state characteristics of double-layered porous journal bearings

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