Identification of Gas Turbine Dynamics: Time-Domain Estimation Problems PUBLIC ACCESS

[+] Author Affiliations
David C. Hill

Rolls-Royce plc, Derby, UK

Paper No. 97-GT-031, pp. V004T15A008; 7 pages
  • ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 4: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award
  • Orlando, Florida, USA, June 2–5, 1997
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7871-2
  • Copyright © 1997 by ASME


The characteristic form of a linear gas turbine model is examined. Time domain models are obtained from engine test data. Transfer function model estimates exhibit unrealistic pole positions. This is caused by systematic bias in the parameter estimates, coupled with high sensitivity of the poles to parameter errors. The bias is a result of using a measured fuel flow as the model input. This violates the requirement that the input be piece-wise constant. The problem is reduced using multiple-output state space models, which are less sensitive to small parameter errors.

Copyright © 1997 by ASME
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