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Measurement and Diagnosis of Jet Engine Vibration
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English
Abstract
The U. S. Air Force Engineering Development Program has established a method of isolating vibration from a single force function within turbojet engines. The stimulus of this program was that a large number of jet engines were removed from service for exceeding the established overall vibration. In most instances, complete overhaul of these engines did not identify the source of vibration. The result was high cost of repair in manhours and materials, plus engine unavailability.
The goal of this program was to develop vibration equipment and limits that could be used in the field to isolate sources of excessive vibration and enable the using activity to remove the defective component. Techniques used to establish filtering requirements to isolate a single vibration source from the complex input, equipment specifications, and vibration limits on selected parts will be discussed. The type of instrumentation used for jet engine diagnosis using vibration trouble-shooting limit charts will be included in the discussion.
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Authors
Citation
Young, F., Bays, W., and Reynolds, E., "Measurement and Diagnosis of Jet Engine Vibration," SAE Technical Paper 670870, 1967, https://doi.org/10.4271/670870.Also In
References
- Military Specification Analyzer Vibration EAU-5/E, MIL-A-38260A (USAF) 31 Jul 1964
- Cochardt A. W. “A Method of Determining the Internal Damping of Machine Members.” Journal of Applied Mechanics 1954
- Goodman Klumpp “Analysis of Slip Damping with Reference to Turbine-Blade Vibration.” Journal of Applied Mechanics 1955
- Lazan B. J. “Comment on ‘A Method for Determining the Internal Damping of Machine Members’.” Journal of Applied Mechanics 1955
- Lazan B. J. “Effect of Damping Constants and Stress Distribution on the Resonance Response of Members.” Journal of Applied Mechanics 75 1951
- Cochardt A. W. “The Origin of Damping in High-Strength Ferromagnetic Alloys.” Journal of Applied Mechanics 75 1953
- Theodorsen Theodore Garrick I. E. “Mechanism of Flutter.” NACA Report 685, 26th Annual Report 1940