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RESEARCH PAPERS

Influence of Inlet Oil Temperature on the Instability Threshold of Rotor-Bearing Systems

[+] Author and Article Information
J. K. Wang

Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA 70803

M. M. Khonsari1

Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA 70803

1

Corresponding author.

J. Tribol 128(2), 319-326 (Oct 11, 2005) (8 pages) doi:10.1115/1.2162920 History: Received August 17, 2005; Revised October 11, 2005

The existing literature contains a number of disparities in assessing the effect of inlet oil temperature on the instability threshold speed in hydrodynamic journal bearings. Specifically, some papers have presented evidence that lowering the inlet oil temperature tends to have a stabilizing effect, whereas others have shown the opposite. No clear explanation has been offered for this phenomenon. This paper presents the results of a series of experiments that explain the nature of these disparities and sheds light on the effect of the inlet oil temperature on the instability threshold in hydrodynamic journal bearings.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Model for the lightly and centrally loaded flexible rotor supported by two oil-film journal bearings

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Figure 2

Simplified model for the rotor-bearing system

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Figure 3

Stability of the rotor-bearing system (L∕D=0.5)

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Figure 4

Inlet oil temperature effects on the stability threshold speed

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Figure 5

Hysteresis phenomenon

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Figure 6

Experimental verification of the dip phenomenon

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Figure 7

Case No. 1: Operating points change (from unstable to stable) as the inlet temperature is decreased from 44.4to28.9°C

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Figure 8

Variation of the vibration amplitude as the inlet oil temperature is decreased from 44.4to28.9°C.

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Figure 9

The waterfall plot of the vibration amplitude changes as inlet oil temperature is decreased from 44.4to28.9°C

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Figure 10

Case No. 2: Operating points change (from stable to unstable) as the inlet temperature increases from 31.1to57.2°C

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Figure 11

Variation of the vibration amplitude as the inlet oil temperature is increased from 31.1to57.2°C

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Figure 12

Case No. 3: Operating points change (from stable to unstable then stable) as the inlet temperature is increased from 63.9to88.3°C

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Figure 13

The trend plot of the vibration amplitude changes as inlet oil temperature is increased from 63.9to88.3°C

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Figure 14

The waterfall plot of the vibration amplitude changes as inlet oil temperature is increased from 63.9to88.3°C

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