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Journal of Tribology | Volume 132 | Issue 4 | Research Paper
Research Papers: Friction & Wear

Condition Monitoring of Molybdenum Disulphide Coated Thrust Ball Bearings Using Time-Frequency Signal Analysis

[+] Author and Article Information
Ali Kahirdeh

Department of Mechanical Engineering, Louisiana State University, 2058 Patrick Taylor Hall, Baton Rouge, LA 70803

M. M. Khonsari1

Department of Mechanical Engineering, Louisiana State University, 2058 Patrick Taylor Hall, Baton Rouge, LA 70803khonsari@me.lsu.edu

1

Corresponding author.

J. Tribol 132(4), 041606 (Oct 08, 2010) (11 pages) doi:10.1115/1.4002379 History: Received March 29, 2010; Revised August 08, 2010; Published October 08, 2010; Online October 08, 2010
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A method for detection of wear in thrust ball bearings coated with molybdenum disulphide (MoS2) is presented. It employs an energy feature obtained from time-frequency representation of the vibration signal. Extensive experimental studies are conducted to verify the efficacy of the proposed method for fault diagnosis of MoS2 coating. These experiments are conducted under both oscillatory and unidirectional motions. The results of vibrations are corroborated with the friction coefficient from the onset of the motion until failure develops. Through monitoring of the energy in time-frequency domain as well as the coefficient of friction, three stages of coating life are identified. They are healthy period, developing damage, and failure. It is shown that the energy feature can detect whenever wear and damage appear and solid lubricant loses its lubrication capabilities.
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Copyright © 2010 by American Society of Mechanical Engineers
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+Modular architecture for the fault detection system
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Modular architecture for the fault detection system
Figure 1

Modular architecture for the fault detection system

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+MoS2 coated thrust ball bearings
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MoS2 coated thrust ball bearings
Figure 2

MoS2 coated thrust ball bearings

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+Schematic of the LRI-1A tribometer
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Schematic of the LRI-1A tribometer
Figure 3

Schematic of the LRI-1A tribometer

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+Three stages of coating life. (a) Fresh MoS2 coated surface. (b) Coated surface after 360 min while bearing is operating in healthy regime. (c) Failure of the coating. The arrows show the debris ejected from the raceway and accumulated on the sides of the raceway.
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Three stages of coating life. (a) Fresh MoS2 coated surface. (b) Coated surface after 360 min while bearing is operating in healthy regime. (c) Failure of the coating. The arrows show the debris ejected from the raceway and accumulated on the sides of the raceway.
Figure 4

Three stages of coating life. (a) Fresh MoS2 coated surface. (b) Coated surface after 360 min while bearing is operating in healthy regime. (c) Failure of the coating. The arrows show the debris ejected from the raceway and accumulated on the sides of the raceway.

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+Case 1: (a) Energy in the time-frequency plane. (b) Plot of the coefficient of friction unidirectional case. Three stages of healthy period (I), developing damage (II), and failure (III) is apparent.
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Case 1: (a) Energy in the time-frequency plane. (b) Plot of the coefficient of friction unidirectional case. Three stages of healthy period (I), developing damage (II), and failure (III) is apparent.
Figure 5

Case 1: (a) Energy in the time-frequency plane. (b) Plot of the coefficient of friction unidirectional case. Three stages of healthy period (I), developing damage (II), and failure (III) is apparent.

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+Case 1: Depleted raceway after the 3000 min
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Case 1: Depleted raceway after the 3000 min
Figure 6

Case 1: Depleted raceway after the 3000 min

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+Case 2: (a) Energy in the time-frequency plane. (b) Plot of the coefficient of friction in oscillatory case. Three stages of the healthy period (I), developing damage (II), and failure (III) are detected.
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Case 2: (a) Energy in the time-frequency plane. (b) Plot of the coefficient of friction in oscillatory case. Three stages of the healthy period (I), developing damage (II), and failure (III) are detected.
Figure 9

Case 2: (a) Energy in the time-frequency plane. (b) Plot of the coefficient of friction in oscillatory case. Three stages of the healthy period (I), developing damage (II), and failure (III) are detected.

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+Time domain vibration signal for the first accelerometer
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Time domain vibration signal for the first accelerometer
Figure 10

Time domain vibration signal for the first accelerometer

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+Reduced thickness of MoS2 coating
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Reduced thickness of MoS2 coating
Figure 13

Reduced thickness of MoS2 coating

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+Case 5: (a) Energy in the time-frequency representation of the signal. (b) Plot of the coefficient of friction oscillatory (1.5 Hz). Healthy period is labeled (I) in energy plot.
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Case 5: (a) Energy in the time-frequency representation of the signal. (b) Plot of the coefficient of friction oscillatory (1.5 Hz). Healthy period is labeled (I) in energy plot.
Figure 14

Case 5: (a) Energy in the time-frequency representation of the signal. (b) Plot of the coefficient of friction oscillatory (1.5 Hz). Healthy period is labeled (I) in energy plot.

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+Case 4: (a) Energy in the time-frequency representation of the signal. (b) Plot of the coefficient of friction oscillatory (1 Hz). Healthy period (I) and failure occurrences are labeled using roman numerals.
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Case 4: (a) Energy in the time-frequency representation of the signal. (b) Plot of the coefficient of friction oscillatory (1 Hz). Healthy period (I) and failure occurrences are labeled using roman numerals.
Figure 12

Case 4: (a) Energy in the time-frequency representation of the signal. (b) Plot of the coefficient of friction oscillatory (1 Hz). Healthy period (I) and failure occurrences are labeled using roman numerals.

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+Case 3: (a) Energy in the time-frequency representation of the signal. (b) Plot of the coefficient of friction, oscillatory (0.5 Hz). Five steps of damage developing and failure occurrences are apparent and labeled using roman numerals. Before these steps, MoS2 is operating in healthy period.
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Case 3: (a) Energy in the time-frequency representation of the signal. (b) Plot of the coefficient of friction, oscillatory (0.5 Hz). Five steps of damage developing and failure occurrences are apparent and labeled using roman numerals. Before these steps, MoS2 is operating in healthy period.
Figure 11

Case 3: (a) Energy in the time-frequency representation of the signal. (b) Plot of the coefficient of friction, oscillatory (0.5 Hz). Five steps of damage developing and failure occurrences are apparent and labeled using roman numerals. Before these steps, MoS2 is operating in healthy period.

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+Time domain vibration signal
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Time domain vibration signal
Figure 8

Time domain vibration signal

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+Transfer film on the balls in case 1 after the experiment
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Transfer film on the balls in case 1 after the experiment
Figure 7

Transfer film on the balls in case 1 after the experiment

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