Justine LARIVIERE : "Robust tolerancing of railway vehicle components to insure performance"

Travaux de thèse de Justine LARIVIERE : "Robust tolerancing of railway vehicle components to insure performance"

The defense is public. Given the health measures currently in force, the wearing of a mask (not provided) is mandatory for all persons wishing to attend.

Abstract :The required level of accuracy for the dynamic railway vehicle performance requirements is often difficult for manufacturers to determine. This is due, on the one hand, to the complexity of the physics-based models, and on the other hand, to the difficulty of gathering exhaustive information on the actual dispersion in the characteristics of the various vehicle components. The objective of this thesis is to develop a generic methodology for determining the allowable design tolerances for the components which will guarantee acceptable performance as well as compliance with the design constraints. The first part of this work focuses on the selection of the dominant design parameters using a sensitivity analysis. Given the large computational burden involved, a strategy is proposed to reduce calculation costs by replacing nonlinear time domain analyses by a series of linear modal analyses at different points in the design space. The second part deals with a tolerance optimization approach in order to manage vehicle manufacturing costs and uncertainties. The proposed solution is based on surrogate models and provides decision-making indicators for analyzing the trade-off between the cost of reducing tolerances and improving performance.

Jury composition:

Mme Evelyne AUBRY, Professeur des universités , ENSISA, Examinatrice
M. Anas BATOU, Professeur des universités, Université Paris-Est, Rapporteur
Mme Fabienne BONDON, Manager du pôle dynamique, Alstom Le Creusot Examinatrice
M. Jean-Claude GOLINVAL, Professeur des universités , Université de Liège, Belgique, Rapporteur
M. Peter L. GREEN, Senior Lecturer, University of Liverpool, UK, Examinateur
M. Scott COGAN, CR HDR, CNRS, Femto-ST, Directeur de thèse
M. Emmanuel FOLTÊTE, Professeur des universités, ENSMM, Co-directeur de thèse
M. Guillaume HAM-LIVET, Docteur-Ingénieur, Alstom Le Creusot, Co-directeur de thèse
M. Si Hai MAI, Chef de projet, SNCF, Invité
M. Danilo SORRENTINO, Chef de la Section Conditions de Circulation, SNCF, Invité

Localization : salle Transfert 1 du bâtiment Transfert de l’ENSMM (26 Rue de l'épitaphe, 25000 Besançon)