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Modélisation discrète et formelle des exigences temporelles pour la validation et l’évaluation de la sécurité ferroviaire

Abstract : The introduction of new European standards for railway safety, coupled with an increasing use of software technology changes the method of development of critical railway systems. Indeed, new systems have to be at least as good as the previous ones. Therefore the appropriate safety level of critical systems has to be proved in order to obtain the necessary approval from the authorities. Accordingly a high level of reliability and correctness must be reached by the use of mathematical proofs and then formal methods. We focus on the treatment of the temporal requirements in the level crossing case study which is modelled with p-time Petri nets, and on the translation of this model in a more formal way by using the B method. This paper introduces a methodology to analyse the safety of timed discrete event systems. First, our goal is to take out the forbidden state highlighted by a p-time Petri net modelling. This model deals with the requirements of the considered system and has to contain all the constraints that have to be respected. Then we aim at describing a process identified as a solution of the system functioning. This method consists in exploring all the possible behaviours of the system by means of the construction of state classes. Finally, we check if the proposed process corresponds to the requirements model previously built.Our case-study is the level crossing, a critical component for the safety of railway systems
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Submitted on : Thursday, April 7, 2011 - 11:49:05 AM
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François Defossez. Modélisation discrète et formelle des exigences temporelles pour la validation et l’évaluation de la sécurité ferroviaire. Autre. Ecole Centrale de Lille, 2010. Français. ⟨NNT : 2010ECLI0004⟩. ⟨tel-00584005⟩

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