Improving the Performance of Bearing Fault Detection on a Turbo Shaft Engine
##plugins.themes.bootstrap3.article.main##
##plugins.themes.bootstrap3.article.sidebar##
Abstract
Health and usage monitoring systems (aka “HUMS”) have typically not been associated with CFR Title 14 type 27 normal category rotorcraft (weighing less than 7000 pounds, with a seating capacity of 9 or less) due in part to the cost of such systems relative to the asset value. This paper describes performance improvements to HUMS bearing diagnostics methodologies to enhance functionality and improve the business case for HUMS. From a system perspective, this implementation allowed the detection of a real-world turboshaft bearing fault prior to a catastrophic engine failure. The system requirements used vibration data that was resampled to control for changes in shaft rate to reduce smearing of the spectrum. A spectral estimation algorithm is then performed to improve the measured energy associated with the bearing defect. Bearing energy was calculated using the envelope analysis, where a novel approach is taken to correctly select the best window. Finally, a process for thresholding and alerting was implemented, the results being that the aircraft was grounded at the appropriate time and a repair was effectuated prior to engine failure.
How to Cite
##plugins.themes.bootstrap3.article.details##
Bearing Analysis
1. Hamrock, B., Dowson, D., "Ball Bearing Mechanics," NASA Technical Memorandum 81691, 1981
2. McFadden, P., (McFadden 1987) “A revised model for the extraction of periodic waveforms by time domain averaging”, Mechanical Systems and Signal Processing 1 (1) 1987, pages 83-95
3. P. D. McFadden and J. D. Smith, “Model for the vibration produced by a single point defect in a rolling element bearing,” Journal of Sound and Vibration, vol. 96, no. 1, pp. 69–82, 1984.
4. Randal, R. B., Vibration-based Condition Monitoring, John Wiely & Sons, 2011.
5. Antoni, J., Randall, RB., “The spectral Kurtosis: application to the vibratory surveillance and diagnostics of rotating machines”, Mechanical systems and signal processing 20(2), 2006
6. Rayleigh, Lord, 1894, Theory of Round, 2nd Ed, London, Macmillian
7. Timoshenko, S., Theory of plates and shells, McGraw Hill, New York, 1940.
8. Bechhoefer, E., He, D., Dempsey, P., "Gear Health Threshold Setting Based on a Probability of False Alarm," Conference of the Prognostics and Health Management Society, 2011.
9. Bechhoefer, E., & Dube, M. (2020). Contending Remaining Useful Life Algorithms. Annual Conference of the PHM Society, 12(1), 9.
This work is licensed under a Creative Commons Attribution 3.0 Unported License.
The Prognostic and Health Management Society advocates open-access to scientific data and uses a Creative Commons license for publishing and distributing any papers. A Creative Commons license does not relinquish the author’s copyright; rather it allows them to share some of their rights with any member of the public under certain conditions whilst enjoying full legal protection. By submitting an article to the International Conference of the Prognostics and Health Management Society, the authors agree to be bound by the associated terms and conditions including the following:
As the author, you retain the copyright to your Work. By submitting your Work, you are granting anybody the right to copy, distribute and transmit your Work and to adapt your Work with proper attribution under the terms of the Creative Commons Attribution 3.0 United States license. You assign rights to the Prognostics and Health Management Society to publish and disseminate your Work through electronic and print media if it is accepted for publication. A license note citing the Creative Commons Attribution 3.0 United States License as shown below needs to be placed in the footnote on the first page of the article.
First Author et al. This is an open-access article distributed under the terms of the Creative Commons Attribution 3.0 United States License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.