Parameter Identification of Compressor Dynamics During Closed-Loop Operation

[+] Author and Article Information
J. Paduano, L. Valavani, A. H. Epstein

Gas Turbine Laboratory, Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, Cambridge, MA 02139

J. Dyn. Sys., Meas., Control 115(4), 694-703 (Dec 01, 1993) (10 pages) doi:10.1115/1.2899198 History: Received November 20, 1991; Revised January 05, 1993; Online March 17, 2008


A low-speed axial research compressor has been fitted with movable inlet guide vanes to allow for feedback stabilization of rotating stall. A model exists whose structure captures the input-output behavior, and stabilization of rotating stall is possible using this model. Quantitative identification of the parameters in the rotating stall model requires the ability to identify MIMO dynamics, which may be unstable, during closed loop operation. The ‘instrumental variable’ technique is presented as the basic approach to this problem. The necessary extensions to the basic technique are discussed, and the resulting algorithm is applied. Experimental results are presented which verify that the methodology yields useful estimates.

Copyright © 1993 by The American Society of Mechanical Engineers
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