Technical Brief

Oscillating Journal Bearings Under Steady Load: A Numerical Study of Limiting Cases

[+] Author and Article Information
S. Boedo, D. P. Anderson

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 March 24, 2015; final manuscript received June 21, 2015; published online September 3, 2015. Assoc. Editor: Sinan Muftu.

J. Tribol 138(1), 014502 (Sep 03, 2015) (6 pages) Paper No: TRIB-15-1091; doi: 10.1115/1.4031313 History: Received March 24, 2015; Revised June 21, 2015

This note provides a more extensive assessment of bearing performance for steadily loaded oscillating journal bearings using the mobility method of solution. Even with significantly large journal oscillation amplitudes, unexpectedly thin films are predicted for conventional designs as the load number goes to zero. Offset journal bearing arrangements subjected to the same loads and kinematics are shown to provide a substantial improvement in film thickness, particularly at low oscillation amplitudes, compared with the conventional design configuration.

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Grahic Jump Location
Fig. 6

Radial component of mobility vector: short bearing film model

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Fig. 5

Cyclic maximum eccentricity ratio: conventional bearing, short bearing film model

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Fig. 4

Periodic journal orbits: conventional bearing, short bearing film model (relative to moving system frame)

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Fig. 3

Fixed and moving reference frame definitions (relative to load)

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Fig. 2

Periodic journal orbits: conventional bearing, short bearing film model (relative to fixed system frame)

Grahic Jump Location
Fig. 7

Limiting zero-load journal orbit radius

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Fig. 8

Schematic of three-segment offset bearing

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Fig. 9

Offset bearing kinematics [3]

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Fig. 10

Cyclic maximum eccentricity ratio: offset bearing, short bearing film model

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Fig. 11

Periodic journal orbits: offset bearing, short bearing film model



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