Many practical rotor dynamic systems contain shaft/rotor elements that are highly susceptible to transverse cross-sectional cracks due to fatigue. The early detection of mechanical malfunction that can be provided by an effective vibration monitoring system is essential. Two theoretical analyses, global and local asymmetry crack models, are utilized to identify characteristics of the system response that may be directly attributed to the presence of a transverse crack in a rotating shaft. A model consisting of an overhung whirling rotor is utilized to match an experimental test rig. A harmonic component of the system response is shown to be the primary response characteristic resulting from the introduction of a crack. Once the unique characteristics of the system response are identified, they serve then as target observations for the monitoring system.
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April 2005
Technical Papers
Crack Detection in a Rotor Dynamic System by Vibration Monitoring—Part I: Analysis
Itzhak Green, Fellow ASME,
Itzhak Green, Fellow ASME
Georgia Institute of Technology, GWW School of Mechanical Engineering, Atlanta, GA 30332
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Cody Casey
Cody Casey
Schlumberger, 14910 Airline Road, Rosharon, TX 77583
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Itzhak Green, Fellow ASME
Georgia Institute of Technology, GWW School of Mechanical Engineering, Atlanta, GA 30332
Cody Casey
Schlumberger, 14910 Airline Road, Rosharon, TX 77583
Contributed by the International Gas Turbine Institute (IGTI) of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Paper presented at the International Gas Turbine and Aeroengine Congress and Exhibition, Atlanta, GA, June 16–19, 2003, Paper No. 2003-GT-38659. Manuscript received by IGTI, October 2002, final revision, March 2003. Associate Editor: H. R. Simmons.
J. Eng. Gas Turbines Power. Apr 2005, 127(2): 425-436 (12 pages)
Published Online: April 15, 2005
Article history
Received:
October 1, 2002
Revised:
March 1, 2003
Online:
April 15, 2005
Citation
Green, I., and Casey, C. (April 15, 2005). "Crack Detection in a Rotor Dynamic System by Vibration Monitoring—Part I: Analysis ." ASME. J. Eng. Gas Turbines Power. April 2005; 127(2): 425–436. https://doi.org/10.1115/1.1789514
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