Analysis of Non-Newtonian Effects in Dynamically Loaded Finite Journal Bearings Including Mass Conserving Cavitation

Paranjpe, Rohit S.

doi:10.1115/1.2920943

Cited by 57 publications

(17 citation statements)

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“…These include the issues of inertia, non-Newtonian e ects both in terms of shear-thinning and viscoelasticity, cavitation and elastohydrodynamic lubrication. See, for example, [19][20][21]. Both analytical and numerical methods have been applied to the solution of the Reynolds equation in the context of dynamically loaded journal bearings.…”

Section: Lubrication Theorymentioning

confidence: 99%

Some issues regarding spectral element meshes for moving journal bearing systems

Gwynllyw

Phillips

2005

Int. J. Numer. Meth. Fluids

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This paper concerns the modelling of dynamically loaded journal bearing systems using a moving spectral element method. The moving grid method employed in this paper is the arbitrary Lagrangian-Eulerian (ALE) method. The ALE methodology is compared with a quasi-Eulerian approach in the context of dynamically loaded journal bearings and the advantages of adopting the ALE formulation are highlighted. A comparison with the predictions of lubrication theory is also presented and the limitations of the lubrication approximation are demonstrated when inertial e ects are signiÿcant. A comprehensive set of results is presented illustrating the salient features of the spectral element mesh generation schemes described in the paper and the way in which these impinge on the e ciency of the iterative solution of the discrete equations at each time step.

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Section: Lubrication Theorymentioning

confidence: 99%

Some issues regarding spectral element meshes for moving journal bearing systems

Gwynllyw

Phillips

2005

Int. J. Numer. Meth. Fluids

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“…Following the usual procedure (8), (9), from Eq. [I31 one can derive the Reynolds equation for the Maxwell fluid with the same form as that of Eq.…”

Section: In Case Of Including Viscoelastic Effectmentioning

confidence: 99%

Fast Analysis of Crankshaft Bearings with a Database Including Shear Thinning and Viscoelastic Effects

Zhang

Qiu

1999

Tribology Transactions

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Database consists of nondimensional data of load capacity, KEYWORDS tttcrritnum pressure and its position, flow and power loss factors obtained by solving the full 2 -0 Reynolds equation including the effect of oil feed features of 3609 180" grooves and a single oil hole. Aided by the database, dynamically loaded journal bearings are anrrlyzed without solving the Reynolds equation. The database is interpolated linearly. The jluids shear thinning and elasticity are characterized by the power law and Maxwell models. The so1utiotl.s given by the present method are almost identical to the expensive FDM solution, and the CPU time consumed in the former cases almost can be neglected as compared to the latter c(1.ve.v.

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“…Further models allow for investigating such phenomena as turbulence in journal bearings or transient effects. [14,15] Paranjpe [16] studies dynamically loaded plain journal bearings with non-Newtonian effects.…”

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confidence: 99%

Necessary parameter setting of the finite‐difference method for determining selected rotor‐dynamics characteristics

Goraj¹

2019

Z Angew Math Mech

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The aim of the study is to analyse the adequacy of the finite difference-method (FDM) for determining the stability boundary of a rigid rotor mounted on short hydrodynamic plain journal bearings through the solution of the Reynolds partial differential equation (PDE). The Reynolds equation, obtained by coupling the equation of motion with the continuity equation, governs the pressure distribution in a lubricant film. The quasi stationary form of this equation requires normalization prior to solving, for the numerical error of the FDM to be minimized. Except for numerical benefits, the dimensionless form of the PDE is universally applicable to a bride spectrum of tribological problems, including hydrodynamic plain journal bearings. The present study first examines the adequacy of solver settings, including the computational grid, through comparison of the corresponding numerical results with an analytical solution obtained by means of the Short Bearing Theory (SBT). Two characteristic tribological quantities are selected as the basis for comparison: the modified Sommerfeld number and the bearing attitude angle. Further, dimensionless stiffness and damping tensors, valid for any short hydrodynamic plain journal bearing, are determined from the numerically obtained distribution of the dimensionless hydrodynamic pressure.These two dimensionless tensors allow for the subsequent estimation of the stability boundary, which marks the dimensionless speed at which a given rigid rotor becomes dynamically unstable. The results of the current study demonstrate sensitivity of the FDM results to the numerical step size. The corresponding numerical error is verified using the SBT and presented as function of the dimensionless (relative) journal eccentricity together with rotor start-up curves. As a major finding, a dimensionless range of the step size is identified for the error to remain below 5%. K E Y W O R D Splain journal bearing, Reynolds PDE, rotor-dynamics, Short Bearing Theory, solver settings, stability, tribology, verification PHYSICAL AND NUMERICAL BACKGROUND OF THE REYNOLDS PDEMost mechanical systems contain rotating components, such as shafts, which are supported by stationary parts, or bearings. In general, bearings are classified into three types: fluid film, dry or semi-lubricated bearings, or rolling element bearings. Accordingly, the supporting action is applied to the shaft through a thin film of fluid, dry contact of surfaces, or through rolling elements. Fluid film bearings are furthermore categorised according to direction of load transmission. "Journal bearings" only transfer radial loads, whereas "thrust bearings" are designed to support axial loads. The former are the subject of the present

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Analysis of Non-Newtonian Effects in Dynamically Loaded Finite Journal Bearings Including Mass Conserving Cavitation

Cited by 57 publications

References 0 publications

Some issues regarding spectral element meshes for moving journal bearing systems

Some issues regarding spectral element meshes for moving journal bearing systems

Fast Analysis of Crankshaft Bearings with a Database Including Shear Thinning and Viscoelastic Effects

Necessary parameter setting of the finite‐difference method for determining selected rotor‐dynamics characteristics

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