Least-squares health parameter identification techniques, such as the Kalman filter, have been extensively used to solve diagnosis problems. Indeed, such methods give a good estimate provided that the discrepancies between the model prediction and the measurements are zero-mean, white, Gaussian random variables. In a turbine engine diagnosis, however, this assumption does not always hold due to the presence of biases in the model. This is especially true for a transient operation. As a result, the estimated parameters tend to diverge from their actual values, which strongly degrades the diagnosis. The purpose of this contribution is to present a Kalman filter diagnosis tool where the model biases are treated as an additional random measurement error. The new methodology is tested on simulated transient data representative of a current turbofan engine configuration. While relatively simple to implement, the newly developed diagnosis tool exhibits a much better accuracy than the original Kalman filter in the presence of model biases.
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e-mail: s.borguet@ulg.ac.be
e-mail: p.dewallef@gmail.com
e-mail: o.leonard@ulg.ac.be
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A Way to Deal With Model-Plant Mismatch for a Reliable Diagnosis in Transient Operation
S. Borguet,
S. Borguet
Turbomachinery Group,
e-mail: s.borguet@ulg.ac.be
University of Liège
, Chemin des Chevreuils 1, 4000 Liège, Belgium
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P. Dewallef,
P. Dewallef
Turbomachinery Group,
e-mail: p.dewallef@gmail.com
University of Liège
, Chemin des Chevreuils 1, 4000 Liège, Belgium
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O. Léonard
O. Léonard
Turbomachinery Group,
e-mail: o.leonard@ulg.ac.be
University of Liège
, Chemin des Chevreuils 1, 4000 Liège, Belgium
Search for other works by this author on:
S. Borguet
Turbomachinery Group,
University of Liège
, Chemin des Chevreuils 1, 4000 Liège, Belgiume-mail: s.borguet@ulg.ac.be
P. Dewallef
Turbomachinery Group,
University of Liège
, Chemin des Chevreuils 1, 4000 Liège, Belgiume-mail: p.dewallef@gmail.com
O. Léonard
Turbomachinery Group,
University of Liège
, Chemin des Chevreuils 1, 4000 Liège, Belgiume-mail: o.leonard@ulg.ac.be
J. Eng. Gas Turbines Power. May 2008, 130(3): 031601 (8 pages)
Published Online: March 26, 2008
Article history
Received:
June 20, 2006
Revised:
October 29, 2007
Published:
March 26, 2008
Citation
Borguet, S., Dewallef, P., and Léonard, O. (March 26, 2008). "A Way to Deal With Model-Plant Mismatch for a Reliable Diagnosis in Transient Operation." ASME. J. Eng. Gas Turbines Power. May 2008; 130(3): 031601. https://doi.org/10.1115/1.2833491
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