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Wednesday, May 15 • 9:00am - 9:30am
On Vibration Signature Analysis of Rotor/Shaft Cracks

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A shaft/rotor crack is a common defect in rotating machinery and detection of such crack is a very serious matter. A crack could lead to a catastrophic failure of the rotor if not detected in a timely manner. Vibrations analysis is widely used to monitor the health of the rotating machinery. However, vibration signature of a cracked shaft is not clear, although a considerable literature is available on the vibration analysis of rotor cracks. The problem is further complicated in presence of misalignment and unbalance loadings. This paper examines the effects of misalignment and unbalance on vibration signature of shaft cracks with the aim of developing unique condition indicators (CI) for crack detections. It is also important to gain an understanding of difference between the signature of breathing and open rotor cracks. An experimental investigation was carried out by the authors to determine a unique signature of shaft seeded with different levels of crack. The data is presented for shafts supported on rolling as well as fluid film bearings. Time-Frequency techniques are applied to study rotors operating under non-stationary conditions.


Daming Chen

Spectra Quest, Inc.

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