Casing Vibration and Gas Turbine Operating Conditions

[+] Author and Article Information
K. Mathioudakis, E. Loukis, K. D. Papailiou

National Technical University of Athens, Laboratory of Thermal Turbomachines, 15710 Athens, Greece

J. Eng. Gas Turbines Power 112(4), 478-485 (Oct 01, 1990) (8 pages) doi:10.1115/1.2906192 History: Received January 17, 1989; Online April 24, 2008


The results from an experimental investigation of the compressor casing vibration of an industrial gas turbine are presented. It is demonstrated that statistical properties of acceleration signals can be linked with engine operating conditions. The power content of such signals is dominated by contributions originating from the stages of the compressor, while the contribution of the shaft excitation is secondary. Using nonparametric identification methods, accelerometer outputs are correlated to unsteady pressure measurements taken by fast response transducers at the inner surface of the compressor casing. The transfer functions allow reconstruction of unsteady pressure signal features from the accelerometer readings. A possibility is thus provided for “seeing” the unsteady pressure field of the rotor blades without actually penetrating through the casing, but by simply observing its external surface vibrations.

Copyright © 1990 by The American Society of Mechanical Engineers
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