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A Way to Deal with Model-Plant Mismatch for a Reliable Diagnosis in Transient Operation
Borguet, Sébastien; Dewallef, Pierre; Léonard, Olivier
2006In Proceedings of the ASME Turbo Expo 2006
Peer reviewed
 

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Keywords :
MODEL-PLANT MISMATCH; RELIABLE DIAGNOSIS; TRANSIENT OPERATION; Kalman filter; turbine engine diagnosis
Abstract :
[en] Least-squares health parameter identification techniques such as the Kalman filter have been massively used to solve the problem of turbine engine diagnosis. Indeed, such methods give a good estimate provided that the discrepancies between the model prediction and the measurements are zero-mean, white random variables. In turbine engine diagnosis, however, this assumption does not always hold due to the presence of biases in the model. This is especially true for transient operation. As a result, the estimated parameters tend to diverge from their actual values which strongly deteriorates 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 layout. 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.
Disciplines :
Mechanical engineering
Aerospace & aeronautics engineering
Author, co-author :
Borguet, Sébastien ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Turbomachines et propulsion aérospatiale
Dewallef, Pierre ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Systèmes de conversion d'énergie pour un dévelop.durable
Léonard, Olivier ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Turbomachines et propulsion aérospatiale
Language :
English
Title :
A Way to Deal with Model-Plant Mismatch for a Reliable Diagnosis in Transient Operation
Publication date :
May 2006
Event name :
ASME Turbo Expo 2006 : Power for Land, Sea and Air
Event place :
Barcelona, Spain
Event date :
May 8-11, 2006
Audience :
International
Main work title :
Proceedings of the ASME Turbo Expo 2006
ISBN/EAN :
0-7918-3774-2
Peer reviewed :
Peer reviewed
Commentary :
ASME Paper GT2006-90412
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since 03 September 2009

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