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Performing Diagnosis in Building with Partially Valid Heterogeneous Tests

Year: 2019 Volume: 13 Issue: 10 654 - 659 Pages

• Authors:
• Houda Najeh
• Mahendra Pratap Singh
• Stéphane Ploix
• Antoine Caucheteux
• Karim Chabir
• Mohamed Naceur Abdelkrim

Abstract: Building system is highly vulnerable to different kinds of faults and human misbehaviors. Energy efficiency and user comfort are directly targeted due to abnormalities in building operation. The available fault diagnosis tools and methodologies particularly rely on rules or pure model-based approaches. It is assumed that model or rule-based test could be applied to any situation without taking into account actual testing contexts. Contextual tests with validity domain could reduce a lot of the design of detection tests. The main objective of this paper is to consider fault validity when validate the test model considering the non-modeled events such as occupancy, weather conditions, door and window openings and the integration of the knowledge of the expert on the state of the system. The concept of heterogeneous tests is combined with test validity to generate fault diagnoses. A combination of rules, range and model-based tests known as heterogeneous tests are proposed to reduce the modeling complexity. Calculation of logical diagnoses coming from artificial intelligence provides a global explanation consistent with the test result. An application example shows the efficiency of the proposed technique: an office setting at Grenoble Institute of Technology.

• Keywords:
• Heterogeneous tests
• validity
• building system
• sensor grids
• sensor fault
• diagnosis
• fault detection and isolation.

A Comprehensive Method of Fault Detection and Isolation Based On Testability Modeling Data

Year: 2015 Volume: 9 Issue: 5 1122 - 1125 Pages

• Authors:
• Junyou Shi
• Weiwei Cui

Abstract: Testability modeling is a commonly used method in testability design and analysis of system. A dependency matrix will be obtained from testability modeling, and we will give a quantitative evaluation about fault detection and isolation. Based on the dependency matrix, we can obtain the diagnosis tree. The tree provides the procedures of the fault detection and isolation. But the dependency matrix usually includes built-in test (BIT) and manual test in fact. BIT runs the test automatically and is not limited by the procedures. The method above cannot give a more efficient diagnosis and use the advantages of the BIT. A Comprehensive method of fault detection and isolation is proposed. This method combines the advantages of the BIT and Manual test by splitting the matrix. The result of the case study shows that the method is effective.

• Keywords:
• BIT
• fault detection
• fault isolation
• testability modeling.

On the Representation of Actuator Faults Diagnosis and Systems Invertibility

Year: 2014 Volume: 8 Issue: 2 379 - 390 Pages

• Authors:
• Sallem F.
• Dahhou B.
• Kamoun A.

Abstract: In this work, the main problem considered is the  detection and the isolation of the actuator fault. A new formulation of  the linear system is generated to obtain the conditions of the actuator  fault diagnosis. The proposed method is based on the representation  of the actuator as a subsystem connected with the process system in  cascade manner. The designed formulation is generated to obtain the  conditions of the actuator fault detection and isolation. Detectability  conditions are expressed in terms of the invertibility notions. An  example and a comparative analysis with the classic formulation  illustrate the performances of such approach for simple actuator fault  diagnosis by using the linear model of nuclear reactor.  

• Keywords:
• Actuator fault
• Fault detection
• left invertibility
• nuclear reactor
• observability
• parameter intervals
• system inversion.