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Research Papers: Elastohydrodynamic Lubrication

Observations of Acoustic Emission Under Conditions of Varying Specific Film Thickness for Meshing Spur and Helical Gears

[+] Author and Article Information
R. I. Raja Hamzah

Faculty of Mechanical Engineering, University Technology Malaysia, 81300 Johore, Malaysia

Khamis R. Al-Balushi

College of Engineering, Sultan Qaboos University, PC 123 Al Khoudh, Sultanate of Oman

D. Mba

School of Engineering, Cranfield University, Cranfield, Beds MK43 0AL, UKd.mba@cranfield.ac.uk

J. Tribol. 130(2), 021506 (May 06, 2008) (12 pages) doi:10.1115/1.2908915 History: Received June 15, 2007; Revised December 22, 2007; Published May 06, 2008

This paper presents experimental findings on the generation of acoustic emission (AE) from operational spur and helical gears as a function of specific film thickness (λ). The latter was varied while the gears were operating by spraying liquid nitrogen onto the rotating gear wheel over a range of load and speed conditions. It was observed that the level of AE activity was dependent on the specific film thickness (λ) and consequently the level asperity contact. The presented finding on both spur and helical gears is the first known attempt at correlating friction, film thickness, and gear operating conditions with AE.

Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Back-to-back test gearbox arrangement

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Figure 2

AE sensor and thermocouple location on test pinion gear

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Figure 3

Liquid nitrogen entrance on the test gearbox

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Figure 4

AE rms plotted for specific film thickness (λ) calculated based on gear metal and oil sump temperature (spur gear at speed of 1450rpm and load of 120Nm with Lubricant A)

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Figure 5

Wave forms changes for test with 60Nm load, 700rpm speed, and Lubricant B: (a) spur gear and (b) helical gear

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Figure 6

Histograms of spur gear AE signals for different temperatures

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Figure 7

Histograms of helical gear AE signals for different temperatures

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Figure 8

Statistical parameters associated with spur test gears

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Figure 9

Statistical parameters associated with helical test gears

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Figure 10

Procedure for determining average amplitude-to-noise ratio (spur gear at load of 60Nm and speed of 700rpm with Lubricant B)

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Figure 11

Amplitude-to-noise ratio for both spur and helical gears at different points during the experiment

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Figure 12

AE rms due to temperature changes under static load at 250Nm

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Figure 13

AE rms during metal cooling and warming up processes (Lubricant A at 1450rpm and 250Nm)

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Figure 14

AE rms values as the specific film thickness (λ) for spur gear: (a) Lubricant A and (b) Lubricant B

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Figure 15

AE rms values as the specific film thickness (λ) changes for helical gear: (a) Lubricant A and (b) Lubricant B

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Figure 16

AE activity due to thick/frozen oil (helical gear test with Lubricant A, load of 120Nm, and speed of 700rpm)

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