Next up in our line-up of speakers is Wael Moussa. Wael will be giving a talk on Thermography-Assisted Bearing Condition Monitoring.
Date: Wednesday July 3rd
Location: CBY B205
I hope to see you all there!
Thermography-Assisted Bearing Condition Monitoring
Bearings are widely used in almost all rotational mechanical systems. The monitoring their conditions are crucial to reliable operations. Although temperature monitoring methods were previously judged as low responsive approaches to mechanical system condition assessment, the advancement of temperature sensing devices and the recent results in rolling contact tribology encourage the revisit of these methods.
In this study two systems are implemented respectively using thermography and infrared sensor for detection of the bearing faults based on temperature rise curve during thermal transient period before reaching the thermal equilibrium condition. The results are compared with the finite element model developed using the ANSYS workbench software. It is shown that, although the equilibrium temperature for bearing outer surface is not sensitive to different bearing faults, the temperature rise curve during thermal transient period is sensitive to all bearing faults. Furthermore, this transient curve is useful in finding lubricant performance and specifying optimum lubricant volume for every operating condition.
To further exploit the rich information provided by the data during the thermal transient period, a system that stimulates such a transient behavior is proposed. This is done by changing the temperature of the bearing surrounding environment using surface heaters . The results have shown a great similarity between the stimulated transient behavior and the actual one observed at the beginning of the bearing operations. It is also shown that bearing faults can be detected even after the bearing enters its thermal equilibrium condition.
This study has demonstrated that the temperature-based approach can effectively detect lubrication deficiency long before a physical bearing fault develops. As the lubricant deficiency eventually causes physical bearing damages, this makes the temperature-based approaches particularly effective in early fault detection, thought such approaches tend to be less responsive to actual physical damages themselves.