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Technical Briefs

A Hybrid Mobility Solution Approach for Dynamically Loaded Misaligned Journal Bearings

[+] Author and Article Information
S. Boedo

Department of Mechanical Engineering,
Rochester Institute of Technology,
Rochester, NY 14623

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received July 22, 2012; final manuscript received November 3, 2012; published online December 26, 2012. Assoc. Editor: Mihai Arghir.

J. Tribol 135(2), 024501 (Dec 26, 2012) (5 pages) Paper No: TRIB-12-1118; doi: 10.1115/1.4023083 History: Received July 22, 2012; Revised November 03, 2012

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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References

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Figures

Grahic Jump Location
Fig. 3

Mobility error measures: |Φ| = 0.1, L/D = 1/2

Grahic Jump Location
Fig. 4

Maximum modified midplane eccentricity ratio for selected L/D ratios: Emax = 10%

Grahic Jump Location
Fig. 5

Bearing load history: sample application

Grahic Jump Location
Fig. 6

Periodic time histories of midplane eccentricity ratio: sample application, φX = 6 × 10−4 rad, φY = 0, Emax = 30%

Grahic Jump Location
Fig. 7

Periodic time histories of minimum film thickness: sample application, φX = 6 × 10−4 rad, φY = 0, Emax = 30%

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