Closure to “Discussions of ‘Dynamically Loaded Journal Bearings: A Finite Element Treatment for Rigid and Elastic Surfaces’” (1985, ASME J. Tribol., 107, pp. 513–514)

Hydrodynamic lubrication of dynamically loaded journal bearings with both rigid and flexible housings is treated by a unified computational procedure based on the finite element method. Numerical examples show effects of mesh density and housing flexibility under steady and periodic loading.

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A Hybrid Mobility Solution Method for Dynamically Loaded Misaligned Journal Bearings

ASME/STLE 2012 International Joint Tribology Conference ◽

10.1115/ijtc2012-61225 ◽

2012 ◽

Cited By ~ 2

Author(s):

S. Boedo

Keyword(s):

Finite Element ◽

Reynolds Equation ◽

Solution Method ◽

Hybrid Approach ◽

Journal Bearings ◽

Finite Element Solution ◽

Computational Time ◽

Element Solution ◽

Dynamically Loaded ◽

Mobility Solution

This paper presents a hybrid mobility solution approach to the analysis of dynamically loaded misaligned journal bearings. Mobility data obtained for misaligned bearings (calculated from a finite element representation of the Reynolds equation) are compared with existing curve-fitted mobility maps representative of a perfectly aligned bearing. A relative error analysis of mobility magnitude and direction provides a set of misaligned journal bearing configurations (midplane eccentricity ratio and normalized misalignment angle) where existing curve-fitted mobility map components based on aligned bearings can be used to calculate the resulting journal motion. For bearing configurations where these mobility maps are not applicable, the numerical simulation process proceeds using a complete finite element solution of the Reynolds equation. A set of numerical examples representing misaligned main and connecting rod bearings in a four-stroke automotive engine illustrate the hybrid solution method. Substantial savings in computational time are obtained using the hybrid approach over the complete finite element solution method without loss of computational accuracy.

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A Hybrid Mobility Solution Approach for Dynamically Loaded Misaligned Journal Bearings

Journal of Tribology ◽

10.1115/1.4023083 ◽

2012 ◽

Vol 135 (2) ◽

Cited By ~ 7

Author(s):

S. Boedo

Keyword(s):

Finite Element ◽

Reynolds Equation ◽

Solution Method ◽

Journal Bearings ◽

Finite Element Solution ◽

Computational Time ◽

Element Solution ◽

Solution Approach ◽

Dynamically Loaded ◽

Mobility Solution

This paper presents a hybrid mobility solution approach to the analysis of dynamically loaded misaligned journal bearings. Mobility data obtained for misaligned bearings (calculated from a finite element representation of the Reynolds equation) are compared with existing curve-fitted mobility maps representative of a perfectly aligned bearing. A relative error analysis of mobility magnitude and direction provides a set of misaligned journal bearing configurations (midplane eccentricity ratio and normalized misalignment angle), where existing curve-fitted mobility map components based on aligned bearings can be used to calculate the resulting journal motion. For bearing configurations where these mobility maps are not applicable, the numerical simulation process proceeds using a complete finite element solution of the Reynolds equation. A numerical example representing a misaligned main bearing in a four-stroke automotive engine illustrates the hybrid solution method. Substantial savings in computational time are obtained using the hybrid approach over the complete finite element solution method without loss of computational accuracy.

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Discussion: “Dynamically Loaded Journal Bearings: Finite Element Method Analysis” (Goenka, P. K., 1984, ASME J. Tribol., 106, pp. 429–437)

Journal of Tribology ◽

10.1115/1.3260955 ◽

1984 ◽

Vol 106 (4) ◽

pp. 437-438

Author(s):

F. A. Martin

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Journal Bearings ◽

Finite Element Method Analysis ◽

Dynamically Loaded ◽

Method Analysis ◽

Element Method

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Application of a Finite Element Quasi-3D Solution of the Energy Equation to the TEHD Analysis of Dynamically Loaded Journal Bearings

Volume 3: Dynamic Systems and Controls, Symposium on Design and Analysis of Advanced Structures, and Tribology ◽

10.1115/esda2006-95333 ◽

2006 ◽

Author(s):

Fabrizio A. Stefani

Keyword(s):

Finite Element ◽

Energy Equation ◽

Three Dimensional ◽

Journal Bearings ◽

Lubricant Film ◽

New Method ◽

Hydrodynamic Problem ◽

Mechanical Deformations ◽

Dynamically Loaded ◽

Oil Thickness

Taking advantage of the quasi-three-dimensional (quasi-3D) solution of the energy equation in the lubricant film presented in a previous work, a new method for analyzing the lubrication of dynamically loaded bearings is proposed. Cavitation is taken into account with a mass-conserving formulation of the hydrodynamic problem, where viscosity variations through the oil thickness are considered. The heat exchanged by the lubricant film with the bearing and the shaft is computed. Hence the thermo-elastic expansion of both the journal and the sleeve can be considered, together with the mechanical deformations of the bearing.

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Finite Element Analysis of Dynamically Loaded Flexible Journal Bearings: A Fast Newton-Raphson Method

Journal of Tribology ◽

10.1115/1.3261983 ◽

1989 ◽

Vol 111 (4) ◽

pp. 597-604 ◽

Cited By ~ 68

Author(s):

J. D. C. McIvor ◽

D. N. Fenner

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Computing Time ◽

Journal Bearings ◽

Element Analysis ◽

Dynamically Loaded ◽

Newton Raphson ◽

Time Required ◽

Raphson Method ◽

Isoparametric Elements

A fast Newton-Raphson method is presented for the finite element analysis of dynamically loaded flexible journal bearings. The method makes use of 8-node isoparametric elements for the lubrication analysis and 20-node isoparametric elements for the structural analysis. Results are presented for the Ruston and Hornsby 6VEB Mk III marine diesel big-end bearing using this method. The computing time required for this analysis is more than two orders of magnitude less than that previously reported for an elastohydrodynamic bearing analysis using a conventional Newton-Raphson method.

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