Measurements of Self-Excited Rotor-Blade Vibrations Using Optical Displacements

[+] Author and Article Information
A. P. Kurkov

National Aeronautics and Space Administration, Lewis Research Center, Cleveland, Ohio 44135

J. Eng. Gas Turbines Power 106(1), 44-49 (Jan 01, 1984) (6 pages) doi:10.1115/1.3239549 History: Received December 27, 1982; Online October 15, 2009


During the operation of a turbofan engine at part speed, near stall, and elevated inlet pressure and temperature, several vibratory instabilities were excited simultaneously on the first fan rotor. The torsional and bending contributions to the main flutter mode were resolved by using casing-mounted optical displacement sensors. Strain-gage spectra were used to identify other instabilities in the blade-deflection spectra. The characteristics of optical-displacement spectra and their role of monitoring rotor-blade vibrations are discussed.

Copyright © 1984 by ASME
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