A review of linear (dielectric theory) and nonlinear (binary collision theory) formalisms is proposed. The range of validity of both theories is discussed. The differential energy cross sections are fully detailed so that they are suitable for use in any Monte Carlo code. The use of the nonlinear formalism (and consequently the description of the d...
The uncertainty and sensitivity of rotor blade torsion stiffness on rotor power and maximum torsion moment is studied. Comprehensive analysis tools are used to establish rotor performance and structural loads. A global-based uncertainty propagation scheme was applied using a scaling factor to uniformly induce spanwise variability in blade torsion s...
The design and maintenance of turnouts implies considering a great number of external factors that have an effect on their structural integrity. The proper generalised decomposition (PGD) method is used in this paper to carry out a parametrised study of the vehicle-track interaction in a non-intrusive way. The reduced model is built using a defined...
Knowing the probability of failure in real time-i.e. the probability that a system violates some constraints-is decisive for aerospace applications in the presence of state uncertainty. However, it often involves stochastic prediction of the constraints on the upcoming system's trajectory, which is computationally demanding. In addition, the trajec...
Dans de nombreuses disciplines, un système complexe est modélisé par une fonction boîte noire dont le but est de simuler le comportement du système réel. Le système est donc représenté par un modèle entrée-sortie, i.e, une relation entre la sortie Y (ce que l'on observe sur le système) et un ensemble de paramètres extérieurs Xi (représentant typiqu...
An internal charging (IC) analysis of the active measurement box of electrostatic risk (AMBER) instrument onboard Jason-3 in polar earth orbit (PEO) has been performed with a new dedicated modeling chain. The ExtendeD Gdml Editor (EDGE) application is in charge of the definition of the computer-aided design (CAD) model. The Modelling Of Radiation (...
Analytical and Monte Carlo DCNU prediction methods are compared. The difference is studied according to the different assumptions used for the calculations. The analysis is performed as a function of the incident proton fluence. The convergence of the DCNU toward a Gaussian distribution predicted by the central limit theorem is also investigated.
International audience
Space is a hostile environment for embedded electronic devices on board satellites. The high fluxes of energetic electrons that continuously impact these satellites may penetrate inside their electronic components and cause malfunctions. This is the case, for example, with the multipactor effect which corresponds to an electron avalanche in radiofr...
A novel approach to perform unsupervised sequential learning for functional data is proposed. The goal is to extract reference shapes (referred to as templates) from noisy, deformed and censored realizations of curves and images. The proposed model generalizes the Bayesian dense deformable template model, a hierarchical model in which the template ...
