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Tuesday, May 14 • 4:00pm - 4:30pm
Estimation of Instantaneous Angular Speed and Diagnostic of Passengers’ Coach Air-Conditioner Bearings

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In recent decades, many industries, especially in aviation, have been investing in developing efficient maintenance approaches such as condition-based maintenance (CBM). In passenger train cars of the Israel Railways (ISR), some of the bearings of the electrical motors of the air-conditioner suffer repeated failures. Therefore, assessment and prognostics of the remaining useful life of its rolling-element bearing is essential.

One of the most common methods for health monitoring of rotating machinery is based on vibration signals. In rotating machinery, actions of the moving parts take place at specific angular positions rather than at specific times. For this reason, accurate estimation of the instantaneous Angular Speed (IAS) has an important role in facilitating reliable diagnostics of the vibrations providing enriched information about the health status of the machine. In practice, however, direct measurement of the angular speed is sometimes impossible, uneconomical or inaccurate.

This work focuses on the estimation of the IAS of a fan electrical motor for diagnostic of its supporting bearing. In this study, few methods for IAS estimation directly from the vibration signal are compared. Finally, a complete vibration analysis scheme for diagnostics of the axial loaded bearing of the fan is proposed and validated experimentally.


Renata Klein

R.K. Diagnostics

Tuesday May 14, 2019 4:00pm - 4:30pm
Freedom Ballroom II