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Wyświetlanie 1-3 z 3
Tytuł:
Directed hypergraph observers-based qualitative fault monitoring tasks
Autorzy:
Garai, Dhaou
El Harabi, Rafika
Bacha, Faouzi
Powiązania:
https://bibliotekanauki.pl/articles/2096167.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
graphical modelling
directed hypergraph observer
fault monitoring
qualitative analysis
modelowanie graficzne
monitorowanie błędów
analiza jakościowa
Opis:
To create a precise model structure and perform fault monitoring algorithms for a wide range of complex systems along with dynamic behavioural characteristics, the causal graph-based methods were considered herein. In this paper, a new scheme was devised based on fast fault detection mechanism relying on the Directed Hypergraph Observer model. The performance of the suggested pattern is illustrated by a case study including systems with single energy. Noting that the modern methods possess a large range of applications for the reliability and energy effectiveness analysis related to multi-energy systems. The Directed Hypergraph model architecture was exploited to generate the diagnostic condition based on a graphical observer.
Źródło:
Diagnostyka; 2021, 22, 4; 67-76
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fault diagnosis-based observers using Kalman filters and Luenberger estimators: Application to the pitch system fault actuators
Autorzy:
Zemali, Zakaria
Cherroun, Lakhmissi
Hadroug, Nadji
Nadour, Mohamed
Hafaifa, Ahmed
Powiązania:
https://bibliotekanauki.pl/articles/2174470.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
fault detection
estimation
pitch system
Kalman filter
Luenberger observer
wykrywanie uszkodzeń
estymacja
filtr Kalmana
obserwator Luenbergera
Opis:
This paper aims to present a robust fault diagnosis structure-based observers for actuator faults in the pitch part system of the wind turbine benchmark. In this work, two linear estimators have been proposed and investigated: the Kalman filter and the Luenberger estimator for observing the output states of the pitch system in order to generate the appropriate residual between the measured positions of blades and the estimated values. An inference step as a decision block is employed to decide the existence of faults in the process, and to classify the detected faults using a predetermined threshold defined by upper and lower limits. All actuator faults in the pitch system of the horizontal wind turbine benchmark are studied and investigated. The obtained simulation results show the ability of the proposed diagnosis system to determine effectively the occurred faults in the pitch system. Estimation of the output variables is effectively realized in both situations: without and with the occurrence of faults in the studied process. A comparison between the two used observers is demonstrated.
Źródło:
Diagnostyka; 2023, 24, 1; art. no. 2022110
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 1-3 z 3

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