The present dynamic certification process, built thanks to experts' experience is essentially based on experiments. The introduction of the simulation in this process would be of great interest. However an accurate simulation of complex, non-linear systems is complicated, in particular when rare events (unstable behaviour for example) are considered. After having analysed the system and the richness of the present procedure, this paper proposes a method to achieve, in some particular cases, a numerical certification. It focuses on the need for precise and representative excitations (running conditions) and on their variable nature. A probabilistic approach is therefore proposed and illustrated by an example.First the paper presents a short description of the vehicle / track system and of the experimental procedure. The proposed numerical process is then described. The necessity of analysing a set of running conditions at least as large as the one tested experimentally is moreover explained. In the third section a sensitivity analysis of the system is reported, to determine the most influential parameters. Finally the proposed method is summarized and an application is given.
The purpose of the paper is to present a new numerical method suitable for the computation of periodic structures subjected to repeated moving loads. It directly derives from the stationary methods proposed for cylindrical and axisymmetrical structures. Its mains features are the use of a calculation reference related to the moving loads and the periodic property of the thermomechanical response. These methods are developped by PSA and the Ecole Polytechnique, in order to design vented brake discs. In this paper, a brief description of the algorithm is first given and examples of numerical simulations of a vented brake disc are treated. RÉSUMÉ. Cet article porte sur le développement d'une nouvelle méthode de résolution numérique adaptée au calcul de structures périodiques soumises à des chargements mobiles et répétés. Il s'inspire directement des méthodes stationnaires développées pour les structures cylindriques ou axisymétriques. Cette méthode repose sur les principes suivants : le repère de calcul est lié au chargement et non plus à la structure, et la réponse thermomécanique de la structure y est supposée périodique. Cette méthode a été développée par PSA Peugeot Citroën et l'Ecole Polytechnique dans le cadre du dimensionnement des disques de frein ventilés. Dans cet article, on donnera une brève description de l'algorithme puis la simulation mécanique d'un disque de frein ventilé illustrera la méthode.
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