Because several power plants have undergone burst shafts with catastrophic consequences, methods for detecting cracks in the shafts of rotating machinery are of great interest to the research community. Cracked shafts represent a very small percentage of the vibration issues in machinery (less than 2%) compared with other faults such as misalignment and mass imbalance, which are responsible for 85% of these issues. However, if a cracked shaft is not detected early enough, it can jeopardize the safety of operators and result in high costs for replacement. A method sensitive enough to detect cracks in the shafts of rotating machinery is investigated in this paper. It is shown that changes in the natural frequencies and/or mode shapes are not sensitive enough indicators to detect transverse cracks at the mid-span of shafts in rotating machinery. An exhaustive numerical analysis using a finite element model of a simple machine is conducted to consider many different measurements of the machinery vibratory responses that most clearly detect cracking. It is shown that external excitations applied on a bearing enhance the sensitivity of vibration measurements to cracking. Experimental tests are also used to validate several of the numerical simulation findings.
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ASME 2008 Conference on Smart Materials, Adaptive Structures and Intelligent Systems
October 28–30, 2008
Ellicott City, Maryland, USA
Conference Sponsors:
- Aerospace Division
ISBN:
978-0-7918-4332-1
PROCEEDINGS PAPER
Crack Detection in Shafts of Rotating Machinery Using Active Sensing With an External Excitation on a Bearing
Jose´ M. Machorro-Lo´pez,
Jose´ M. Machorro-Lo´pez
Purdue Center for Systems Integrity, Lafayette, IN
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Douglas E. Adams,
Douglas E. Adams
Purdue Center for Systems Integrity, Lafayette, IN
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Julio C. Go´mez-Mancilla
Julio C. Go´mez-Mancilla
National Polytechnic Institute, Mexico City, Mexico
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Jose´ M. Machorro-Lo´pez
Purdue Center for Systems Integrity, Lafayette, IN
Douglas E. Adams
Purdue Center for Systems Integrity, Lafayette, IN
Julio C. Go´mez-Mancilla
National Polytechnic Institute, Mexico City, Mexico
Paper No:
SMASIS2008-467, pp. 129-139; 11 pages
Published Online:
July 13, 2009
Citation
Machorro-Lo´pez, JM, Adams, DE, & Go´mez-Mancilla, JC. "Crack Detection in Shafts of Rotating Machinery Using Active Sensing With an External Excitation on a Bearing." Proceedings of the ASME 2008 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. Smart Materials, Adaptive Structures and Intelligent Systems, Volume 2. Ellicott City, Maryland, USA. October 28–30, 2008. pp. 129-139. ASME. https://doi.org/10.1115/SMASIS2008-467
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