Publica
Hier finden Sie wissenschaftliche Publikationen aus den FraunhoferInstituten. Efficient fault detection for industrial automation processes with observable process variables
 Institute of Electrical and Electronics Engineers IEEE; IEEE Industrial Electronics Society IES: IEEE International Conference on Industrial Informatics, INDIN 2015. Proceedings : Cambridge, United Kingdom, 2224 July 2015 Piscataway, NJ: IEEE, 2015 ISBN: 9781479966486 ISBN: 9781479966493 pp.121126 
 International Conference on Industrial Informatics (INDIN) <13, 2015, Cambridge> 

 English 
 Conference Paper 
 Fraunhofer IOSB () 
Abstract
In this paper, stochastic models for fault detection in industrial automation processes are investigated. Thereby, nonlinear, timevariant systems are considered. The basic idea consists in building a probability distribution model and evaluating the likelihood of observations under that model. In contrast to the existing methods, this paper considers the practically important case in which measurement noise is negligible and all process variables are observable. This assumption allows the direct evaluation of a probability distribution for fault detection without approximations such as second order statistics or particles. The main part of this paper deals with adequate models for this probability distribution such as Gaussian and Hidden Markov models. Such models require predictions of the expectation values of the respective probability distributions. Regression models such as (multivariate) linear regression models and neural networks are investigated for this purpose. Evaluations are conducted with respect to prediction accuracies and fault detection capabilities of the employed models. Evaluations show superior results of the novel approach compared to existing fault detection methods, which are based on approximations such as second order statistics.