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Titre: | Robust Fault Diagnosis using Uncertain Hybrid Bond Graph Model: Application to Controlled Hybrid Thermo-Fluid Process |
Auteur(s): | Lounici, Yacine Touati, Youcef Adjerid, Smail Benazzouz, Djamel |
Mots-clés: | Automation engineering Diagnosis Hybrid bond graph Uncertainties Thermo-fluid process |
Date de publication: | 2019 |
Collection/Numéro: | 4th International Symposium on Materials and Sustainable Development ISMSD2019 Boumerdes - Algeria, November 12-14, 2019; |
Résumé: | The continuous increase in engineering systems complexity and industrial
safety requirements has led to a rising interest in the development of new Fault
diagnosis algorithms. This paper addresses the fault diagnosis problem of uncertain
hybrid systems containing both discrete and continuous modes using a hybrid bond
graph (HBG) approach. The latter provides through its properties, an automatic Global
Analytical Redundancy Relations (GARRs) generation. The numerical evaluation of
GARRs yields fault indicators named residuals, which are used to verify the coherence
between the real system behavior and reference behavior for real-time diagnosis. In fact,
the residual is compared to its adaptive thresholds to detect the actual faults. In addition,
the Global Fault Signature matrix (GFSM) allows making a decision on fault isolation.
The main scientific interest of the proposed method remains in integrating the benefits
of the HBG with the approach for adaptive thresholds generation for systems having
uncertain parameters and measurements. For this task, first, the HBG model is obtained
to model the hybrid system using the controlled junctions taken into consideration
discrete modes changes. Secondly, the parameter and measurement uncertainties are
modelled directly on the HBG in preferred derivative causality for residuals and
adaptive thresholds generation. The proposed methodology is studied under various
scenarios via simulation over a controlled hybrid thermo-fluid two-tank system. |
URI/URL: | http://dlibrary.univ-boumerdes.dz:8080/handle/123456789/7673 |
Collection(s) : | Communications Internationales
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