Optimizing Instrumentation When Measuring Jet Engine Blade Vibration

[+] Author and Article Information
J. H. Griffin

Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213

J. Eng. Gas Turbines Power 114(2), 217-221 (Apr 01, 1992) (5 pages) doi:10.1115/1.2906575 History: Received February 12, 1991; Online April 24, 2008


An analytical model of bladed disk vibration is used to calculate the statistical variations in blade amplitudes that can occur in mistuned turbomachinery blading. The results provide a basis for evaluating alternative strategies for instrumenting the stage. This approach is illustrated by applying it to an unshrouded fan stage. It is found for this stage that the best strategy is to instrument blades that have frequencies near the tuned system frequency. A procedure is proposed for establishing how gages should be allocated from stage to stage throughout the engine.

Copyright © 1992 by The American Society of Mechanical Engineers
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