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TECHNICAL PAPERS

Acoustic Emission and Specific Film Thickness for Operating Spur Gears

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

School of Engineering, Cranfield University, Cranfield MK43 0AL, UK

J. Tribol. 129(4), 860-867 (Apr 23, 2007) (8 pages) doi:10.1115/1.2769732 History: Received October 10, 2006; Revised April 23, 2007

This paper presents experimental results correlating acoustic emission (AE) activity and the specific film thickness (λ) for operational spur gears. This relationship was established by spraying liquid nitrogen onto a rotating gear wheel, thereby reducing its operating temperature and controlling the specific film thickness for a range of load and speed conditions. It is concluded that the level of AE activity is dependent on the specific film thickness and the source of AE during meshing is predominately due to asperity contact. Furthermore, measurements of AE activity may offer an opportunity to quantify the level of asperity contact for meshing gears under a range of operating conditions.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Test rig showing liquid nitrogen entrance (left) and AE sensor and thermocouples on pinion gear (right)

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Figure 2

AE rms plotted with lambda and temperature

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Figure 3

Percentage reduction in AE rms levels as a function of applied torque

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Figure 4

AE rms levels as a function of the maximum specific film thickness (λ2)

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Figure 5

AE levels as a function of changing gear load under near isothermal conditions

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Figure 6

Location where wave forms were captured during the test (Lubricant B at 700rpm and 120Nm)

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Figure 7

AE rms due to micro- and macrochanges in the gear material (static condition, load at 250Nm)

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Figure 8

AE rms during metal cooling and warmup process (Lubricant A at 1450rpm and 120Nm)

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Figure 9

AE rms during metal cooling and warmup process for all speed and load conditions (Lubricant A)

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Figure 10

AE rms during metal cooling and warmup process for all speed and load conditions (Lubricant B)

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