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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.

The Validity Range of LSDP Robust Controller by Exploiting the Gap Metric Theory

Year: 2014 Volume: 8 Issue: 6 1063 - 1069 Pages

• Authors:
• Ali Ameur Haj Salah
• Tarek Garna
• Hassani Messaoud

Abstract: This paper attempts to define the validity domain of LSDP (Loop Shaping Design Procedure) controller system, by determining the suitable uncertainty region, so that linear system be stable. Indeed the LSDP controller cannot provide stability for any perturbed system. For this, we will use the gap metric tool that is introduced into the control literature for studying robustness properties of feedback systems with uncertainty. A 2nd order electric linear system example is given to define the validity domain of LSDP controller and effectiveness gap metric.

• Keywords:
• LSDP
• Gap metric
• Robust Control.

Validity Domains of Beams Behavioural Models: Efficiency and Reduction with Artificial Neural Networks

Year: 2008 Volume: 2 Issue: 6 1925 - 1932 Pages

• Authors:
• Keny Ordaz-Hernandez
• Xavier Fischer
• Fouad Bennis

Abstract: In a particular case of behavioural model reduction by ANNs, a validity domain shortening has been found. In mechanics, as in other domains, the notion of validity domain allows the engineer to choose a valid model for a particular analysis or simulation. In the study of mechanical behaviour for a cantilever beam (using linear and non-linear models), Multi-Layer Perceptron (MLP) Backpropagation (BP) networks have been applied as model reduction technique. This reduced model is constructed to be more efficient than the non-reduced model. Within a less extended domain, the ANN reduced model estimates correctly the non-linear response, with a lower computational cost. It has been found that the neural network model is not able to approximate the linear behaviour while it does approximate the non-linear behaviour very well. The details of the case are provided with an example of the cantilever beam behaviour modelling.

• Keywords:
• artificial neural network
• validity domain
• cantileverbeam
• non-linear behaviour
• model reduction.