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Wednesday, May 15 • 8:30am - 9:00am
The Case of the Missing Bearing Fault Frequency

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During testing on a small gas turbine, frequencies related power turbine shaft and a bearing were observed. The frequencies of the fault were not associated with any known bearing on the power turbine shaft. This paper is an investigation of why the observed bearing fault frequency of 8% lower than anticipated. It will be shown that because the faulted bearing was a worn thrust bearing, the contact angle of the roller element had changed. This is an infrequently observed phenomenon which can lead to a missed fault detection on a critical component. A mitigation strategies for this type of failure is discussed.


Eric Bechhoefer

CEO/Chief Engineer, GPMS Inc

Wednesday May 15, 2019 8:30am - 9:00am
Freedom Ballroom I