RESEARCH PAPERS: Gas Turbines: Controls and Diagnostics

Testing and Modeling Gas Turbines Using Multisine Signals and Frequency-Domain Techniques

[+] Author and Article Information
C. Evans, A. Borrell, D. Rees

University of Glamorgan, School of Electronics, Pontypridd, CF37 1DL, Wales, United Kingdom

J. Eng. Gas Turbines Power 121(3), 451-457 (Jul 01, 1999) (7 pages) doi:10.1115/1.2818494 History: Received March 02, 1998; Revised March 23, 1999; Online December 03, 2007


The frequency-domain identification of gas turbine dynamics is discussed. Models are directly estimated from engine data and used to validate linearized thermodynamic models derived from the engine physics. This work is motivated by the problems previously encountered when using time-domain methods. A brief overview of frequency-domain techniques is presented and the design of appropriate multisine test signals is discussed. Practical results are presented for the modelling of the fuel feed to shaft speed dynamics of a twin-spool engine. The gathered data are analyzed and the frequency response functions of the engine are estimated. The identification of parametric s-domain models is discussed in detail and a comparison made between the identified models and the linearized thermodynamic models. The influence of engine nonlinearities on the linear models is also examined.

Copyright © 1999 by The American Society of Mechanical Engineers
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