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Wyświetlanie 1-2 z 2
Tytuł:
Methodology for monitoring and diagnosing faults of hybrid dynamic systems: a case study on a desalination plant
Autorzy:
Achbi, Mohammed Said
Kechida, Sihem
Powiązania:
https://bibliotekanauki.pl/articles/328392.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
fault diagnosis
hybrid dynamic systems
ANFIS
hybrid automata
desalination plant
diagnostyka uszkodzeń
hybrydowy system dynamiczny
Opis:
The imperative of quality and productivity has increased the complexity of technological processes, posing the problem of reliability. Today, fault diagnosis remains a very important task because of its essential role in improving reliability, but also in minimizing the harmful consequences that can be catastrophic for the safety of equipment and people. Indeed, an effective diagnosis not only improves reliability, but also reduces maintenance costs. Systems in which dynamic behaviour evolves as a function of the interaction between continuous dynamics and discrete dynamics, present in the system, are called hybrid systems. The goal is to develop monitoring and diagnostic procedures to the highest level of control to ensure safety, reliability and availability objectives. This article presents an approach to the diagnosis of hybrid systems using hybrid automata and neural-fuzzy system. The use of the neural-fuzzy system allows modeling the continuous behaviour of the system. On the other hand, the hybrid automata gives a perfect estimate of the discrete events and make it possible to execute a fault detection algorithm mainly consists of classifying the appeared defects. On the implementation plan, the results were applied in a water desalination plant.
Źródło:
Diagnostyka; 2020, 21, 1; 27-33
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagnosis of hybrid systems through bond graph, observers and timed automata
Autorzy:
Mhamdi, Lotfi
Achbi, Mohammed Said
Dhouibi, Hedi
Kechida, Sihem
Powiązania:
https://bibliotekanauki.pl/articles/329496.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
bond graph
observer
timed automata
fault diagnosis
fault localization
grafy wiązań
obserwator
automaty czasowe
błędna diagnoza
lokalizacja uszkodzeń
Opis:
Despite technological advances and progress in industrial systems, the fault diagnosis of a system remains a very important task. In fact an effective diagnosis contributes not only to improved reliability but also to a decrease in maintenance costs. This paper presents an approach to a diagnosis of hybrid systems thanks to the use of Bond Graphs, Observer and Timed Automata. Dynamic models (in normal and failing mode) are generated by an observer based methods as well as through state equations generated by the Bond Graphs model. The procedure of fault localization through a method based on the observer does not allow locating faults with the same signature of failure. Thus the diagnosis technique for the localization of these defects will be based on the time analysis using Timed Automata. The proposed approach is then validated by simulation tests in a two tanks hydraulic system.
Źródło:
Diagnostyka; 2020, 21, 3; 113-125
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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