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Research Papers: Hydrodynamic Lubrication

An Experimental Study of Oil-Lubricated Journal Bearings Undergoing Oscillatory Motion

[+] Author and Article Information
Xiaobin Lu

Department of Mechanical Engineering, Louisiana State University, 2508 CEBA, Baton Rouge, LA 70803

M. M. Khonsari1

Department of Mechanical Engineering, Louisiana State University, 2508 CEBA, Baton Rouge, LA 70803khonsari@me.isu.edu

1

Corresponding author.

J. Tribol 130(2), 021702 (Apr 22, 2008) (7 pages) doi:10.1115/1.2908907 History: Received January 08, 2007; Revised February 15, 2008; Published April 22, 2008

A distinctive behavior of an oil-lubricated journal bearing undergoing oscillatory motion is the evolution of friction hysteresis as it traverses from boundary, to mixed, and to hydrodynamic regime. In this paper, the results of a series of experiments are reported to examine the effects of load, with or without oil, oil type, oil inlet temperature, and oscillating frequency on the friction hysteresis. Three types of hysteresis loop were found. The inertia of the lubricant flow contributes to the friction hysteresis.

Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 2

The angular velocity of the shaft with different oscillating frequencies

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Figure 3

The local history of the friction coefficient, 445N load, 1.0Hz oscillating frequency, bronze bushing, SAE30 oil

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Figure 4

Friction coefficient versus velocity (bronze bushing, 0.5Hz oscillating frequency, SAE30 oil)

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Figure 5

Friction coefficient versus velocity (bronze bushing, 0.5Hz oscillating frequency, SAE30 oil)

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Figure 6

The Stribeck curve (SAE30 oil, 445N load, bronze bushing, unidirectional rotation)

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Figure 7

Friction coefficient versus velocity (bronze bushing, 445N load, SAE30 oil)

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Figure 8

The heat flux variation with the velocity (222N load, bronze bushing, 0.5Hz oscillating frequency, SAE 30 oil with 40°C inlet temperature)

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Figure 9

Comparison of the friction of oscillatory and unidirectional rotations (bronze bushing, SAE30 oil, 222N load)

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Figure 10

Comparison of the friction of oscillatory and unidirectional rotations (bronze bushing, SAE30 oil, 890N load)

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Figure 11

Friction coefficient versus velocity (steel bushing, dry)

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Figure 12

Friction coefficient versus velocity (steel bushing, SAE30 oil)

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Figure 13

Oscillating process

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Figure 14

Idealized illustration of oscillating flow between asperities

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Figure 15

Friction coefficient variation with the velocity history (H-L-L-H) (445N load, bronze bushing, 1.0Hz oscillating frequency, SAE30 oil, 40°C oil inlet temperature)

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Figure 16

Friction coefficient variation with the velocity history (H-L-H-L) (445N load, bronze bushing, 1.0Hz oscillating frequency, SAE40 oil, 40°C oil inlet temperature)

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Figure 17

Friction coefficient variation with the velocity history (L-H-H-L) (445N load, bronze bushing, 0.5Hz oscillating frequency, SAE30 oil, 40°C oil inlet temperature)

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