Artificial intelligence methods in diagnostics of analog systems
Piotr Bilski, Jacek Wojciechowski (2014)
International Journal of Applied Mathematics and Computer Science
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Piotr Bilski, Jacek Wojciechowski (2014)
International Journal of Applied Mathematics and Computer Science
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Piotr Bilski, Jacek Wojciechowski (2014)
International Journal of Applied Mathematics and Computer Science
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Czesław Cempel (2008)
International Journal of Applied Mathematics and Computer Science
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With the tools of modern metrology we can measure almost all variables in the phenomenon field of a working machine, and many of the measured quantities can be symptoms of machine conditions. On this basis, we can form a symptom observation matrix (SOM) intended for condition monitoring and wear trend (fault) identification. On the other hand, we know that contemporary complex machines may have many modes of failure, called faults. The paper presents a method of the extraction of the...
Xavier Olive (2012)
International Journal of Applied Mathematics and Computer Science
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The European leader for satellite systems and at the forefront of orbital infrastructures, Thales Alenia Space, is a joint venture between Thales (67%) and Finmeccanica (33%) and forms with Telespazio a Space Alliance. Thales Alenia Space is a worldwide reference in telecoms, radar and optical Earth observation, defence and security, navigation and science. It has 11 industrial sites in 4 European countries (France, Italy, Spain and Belgium) with over 7200 employees worldwide. Satellite...
Van Tran, Bo-Suk Yang (2010)
Control and Cybernetics
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Yvon Tharrault, Gilles Mourot, José Ragot, Didier Maquin (2008)
International Journal of Applied Mathematics and Computer Science
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Principal component analysis (PCA) is a powerful fault detection and isolation method. However, the classical PCA, which is based on the estimation of the sample mean and covariance matrix of the data, is very sensitive to outliers in the training data set. Usually robust principal component analysis is applied to remove the effect of outliers on the PCA model. In this paper, a fast two-step algorithm is proposed. First, the objective was to find an accurate estimate of the covariance...
Krzysztof Patan, Marcin Witczak, Józef Korbicz (2008)
International Journal of Applied Mathematics and Computer Science
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Challenging design problems arise regularly in modern fault diagnosis systems. Unfortunately, classical analytical techniques often cannot provide acceptable solutions to such difficult tasks. This explains why soft computing techniques such as neural networks become more and more popular in industrial applications of fault diagnosis. Taking into account the two crucial aspects, i.e., the nonlinear behaviour of the system being diagnosed as well as the robustness of a fault diagnosis...
Marcin Witczak (2006)
International Journal of Applied Mathematics and Computer Science
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Challenging design problems arise regularly in modern fault diagnosis systems. Unfortunately, the classical analytical techniques often cannot provide acceptable solutions to such difficult tasks. This explains why soft computing techniques such as evolutionary algorithms and neural networks become more and more popular in industrial applications of fault diagnosis. The main objective of this paper is to present recent developments regarding the application of evolutionary algorithms...
Vicenç Puig (2010)
International Journal of Applied Mathematics and Computer Science
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This paper reviews the use of set-membership methods in fault diagnosis (FD) and fault tolerant control (FTC). Setmembership methods use a deterministic unknown-but-bounded description of noise and parametric uncertainty (interval models). These methods aims at checking the consistency between observed and predicted behaviour by using simple sets to approximate the exact set of possible behaviour (in the parameter or the state space). When an inconsistency is detected between the measured...
Tahar Bouthiba (2004)
International Journal of Applied Mathematics and Computer Science
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This paper deals with the application of artificial neural networks (ANNs) to fault detection and location in extra high voltage (EHV) transmission lines for high speed protection using terminal line data. The proposed neural fault detector and locator were trained using various sets of data available from a selected power network model and simulating different fault scenarios (fault types, fault locations, fault resistances and fault inception angles) and different power system data...