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TECHNICAL PAPERS

An Experimental Study of Grease-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.lsu.edu

1

Corresponding author.

J. Tribol 129(3), 640-646 (Jan 08, 2007) (7 pages) doi:10.1115/1.2736705 History: Received October 27, 2006; Revised January 08, 2007

A series of experiments was performed to study the behavior of grease-lubricated journal bearings. The results reveal that an oscillatory bearing undergoes a transition from boundary, to mixed, and to hydrodynamic regime. Another distinct feature is friction hysteresis that occurs as a result of oscillation. In this paper, we examine the effect of load, oscillating frequency, and lubricant on the friction hysteresis loop.

Copyright © 2007 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

Local history of the coefficient of friction, 667N load, 0.5Hz oscillating frequency, Moly No. 5 grease

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Figure 4

Friction coefficient versus velocity (0.5Hz oscillating frequency, ALG No. 1 grease)

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Figure 5

Friction coefficient versus velocity (0.5Hz oscillating frequency, Moly No. 5 grease)

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Figure 6

Friction coefficient versus velocity (1.0Hz oscillating frequency, ALG No. 1 grease)

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Figure 7

Friction coefficient versus velocity (1.0Hz oscillating frequency, Moly No. 5 grease)

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Figure 8

Friction coefficient versus velocity (1.5Hz oscillating frequency, ALG No. 1 grease)

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Figure 9

Friction coefficient versus velocity (1.5Hz oscillating frequency, Moly No. 5 grease)

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Figure 10

Illustration of the friction hysteresis phenomenon (0.5Hz frequency, 445N load, ALG No. 1 grease)

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Figure 11

Friction coefficient versus velocity (445N load, ALG No. 1 grease)

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Figure 12

Friction coefficient versus velocity (445N load, Moly No. 5 grease)

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Figure 13

Friction coefficient as a function of velocity (ALG No. 1 grease, constant rotation)

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Figure 14

Friction coefficient as a function of velocity (Moly No. 5 grease, constant rotation)

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Figure 15

Friction coefficient versus velocity (445N load, 0.5Hz oscillating frequency)

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Figure 16

Comparison of the friction of ALG No. 1 grease and SAE40 oil (445N load, 0.5Hz oscillating frequency)

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Figure 17

Comparison of the friction of oscillatory and unidirectional rotation (ALG No. 1 grease, 667N load)

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Figure 18

Comparison of the friction of oscillatory and unidirectional rotation (Moly No. 5 grease, 667N load)

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Figure 19

Friction coefficient versus velocity (445N load, dry)

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Figure 20

Oscillating process

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Figure 21

Idealized illustration of oscillating flow between asperities

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Figure 1

A four-bar linkage device

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