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TECHNICAL PAPERS

Thermally Induced Seizure in Journal Bearings During Startup and Transient Flow Disturbance

[+] Author and Article Information
Rajesh Krithivasan, M. M. Khonsari

Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA 70808

J. Tribol 125(4), 833-841 (Sep 25, 2003) (9 pages) doi:10.1115/1.1538619 History: Received July 11, 2002; Revised October 22, 2002; Online September 25, 2003
Copyright © 2003 by ASME
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References

Figures

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Schematic of a journal bearing and its support structure
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Variation of convective heat transfer coefficient during lubricant perturbation
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(a–d) Plots of temperature rise during a transient flow disturbance
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Variation of contact force after the onset of ovalization due to flow disturbance
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Variation of frictional torque when a transient flow disturbance occurred
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Finite element model for thermal analysis, with loads and boundary conditions (not to scale)
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Finite element model for elastic analysis, with loads and boundary conditions
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Temperature rise as a function of time in a journal bearing during start up: (a) temperature rise, 25 seconds after starting; (b) temperature rise, 27 seconds after starting (note the ovalization and establishment of extra contact, A, at the top of bearing); and (c) temperature rise, 29 seconds after starting (note the formation of extra areas of contact and rapid temperature rise).
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Variation of contact forces with time during start-up
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Variation of frictional torque during start-up (note that the frictional torque increased to 50 times the initial frictional torque to indicate seizure)
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Comparison of seizure time with Dufrane and Kannel’s model and the present model. Note: n=heat partition factor.
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Variation of friction coefficient during lubricant perturbation

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