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  • Open Access English
    Authors: 
    Colomb , Michèle; Morange , Philippe; Fournela , Fabrice; Greffier , Florian;
    Country: France

    -; Driving in poor meteorological conditions is particularly dangerous in terms of road safety. In order to investigate the visibility thresholds of targets in these conditions, experiments were conducted in a fog chamber. A new method using a Calibrated camera, in comparison to traditional photometers, was investigated in order to measure the complete visual field using a luminance matrix. The luminance map can subsequently be analysed in order to determine significant parameters for the visibility of the analysed objects. In addition to metrological aspects, the experiment data were analysed and compared to a theoretical approach using a Vision Model developed by Adrian.

  • Other research product . Other ORP type . 2010
    Open Access English
    Authors: 
    Chabot , Armelle;
    Publisher: HAL CCSD
    Country: France

    Invited presentation - Visiting University of Reno, USA

  • Open Access English
    Authors: 
    Brosseaud , Yves;
    Country: France

    Présentation des missions et activités du LCPC.

  • Open Access English
    Authors: 
    AMDITIS, Angelos; BIMPAS, Matthaios; THOMAIDIS, George; TSOGAS, Manolis; NETTO, Mariana; MAMMAR, Said; BEUTNER, Achim; MOHLER, Nikolaus; WIRTHGEN, Tom; ZIPSER, Stephan; +3 more
    Publisher: INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS - IEEE
    Country: France

    Going beyond standard lane-departure-avoidance systems, this paper addresses the development of a system that is able to deal with a large set of different traffic situations. Its foundation lies on a thoroughly constituted environment detection through which a decision system is built. From the output of the decision module, the driver is warned or corrected through suited actuators that are coupled to control strategies. The input to the system comes from cameras, which are supplemented by active sensors (such as radar and laser scanners) and vehicle dynamic data, digital road maps, and precise vehicle-positioning data. In this paper, the presented system design is divided into three layers: the perception layer, which is responsible for the environment perception, and the decision and action layers, which are responsible for evaluating and executing actions, respectively.

  • Other research product . Other ORP type . 2009
    Open Access English
    Authors: 
    SELLOUM, Ahmed; BETAILLE, David; LE CARPENTIER, Eric; PEYRET, François;
    Country: France

    GPS positioning and map-matching are key technologies used in Car Navigation Systems. Next generation of Cooperative Vehicle Infrastructure Systems (CVIS) will surely require positioning component with higher accuracy, integrity and availability, for instance for the needs of lanelevel applications. The concept of Map Aided Location (MAL) was introduced recently: it consists in considering the map contents (geometry and topology) as constraints in the positioning problem. The main contribution of the work reported in this article concerns the evolution model of the vehicle : whereas previous research investigations were based on usual models in plane coordinates, we propose here an evolution model adapted to the local curvature of the road. Therefore, road constraints are emphasized, particularly when GPS outages occur. An enhanced map (Emap) - where all lanes are represented with decimeter accuracy - is used in this Map Aided Location process.

  • Other research product . Other ORP type . 2005
    Open Access English
    Authors: 
    Markewitz , K.; Joumard , Robert;
    Publisher: INRETS
    Country: France

    N° contrat, conv. 1999-RD.10429; Rapport de recherche; L'objectif du travail présenté dans ce document est de définir un modèle d'émission pour les polluants à l'échappement (CO, CO2, HC, NOx et particules) et de consommation de carburant des petits véhicules utilitaires. Un recueil des données a été effectué au sein de différents laboratoires européens et les émissions gazeuses de 150 véhicules testés selon différentes conditions de conduites et de charge ont été recueillies. Le classement des véhicules a été effectué selon le carburant, la norme européenne d'émissions (pre-Euro-1 à Euro-2) et la classification européenne (N1-I, N1-II et N1-III). 24 groupes ont ainsi été distingués. Pour chaque groupe et chacun des polluants réglementaires, un facteur d'émission présenté sous la forme d'une fonction continue du second degré a été établi en fonction de la vitesse moyenne et de la charge et a été statistiquement validé par le test de Pearson

  • Other research product . Other ORP type . 2016
    Open Access English
    Authors: 
    KOUTA, Nataly;
    Country: France

    Mémoire de stage; The use of adhesively bonded composite reinforcement for steel structures induce a closer study of the adhesive as it is considered the weakest point in the assembly. A reliable numerical damage model has been developed for the adhesively bonded joints and then verified for different types of configurations. A bi- linear traction separation description of a cohesive zone model was used in ABAQUS to simulate the damage evaluation in the adhesive. It was then compared to experimental results for the global structure behavior (local strains, applied load, applied displacement).; L'utilisation des renforcements par composites collés pour des structures métalliques implique une étude plus approfondie des adhésifs puisqu'il s'agit dans ce cas de l'élément le plus faible dans l'assemblage. Un modèle d'endommagement numérique a été développé pour le joint collé étudié et appliqué pour diffèrent type de configurations. Le modèle bi linéaire de traction- séparation (modèle de zone cohésives) est réalisé sur ABAQUS pour visualiser l'évaluation de l'endommagement de l'adhésive et pouvoir réaliser une comparaison avec les investigations expérimentales (déformation locale, effort appliqué, déplacement appliqué).

  • Open Access English
    Authors: 
    RODRIGUEZ, J;
    Publisher: HAL CCSD
    Country: France

    C06-32 - PROJET RECIFE Convention N° 02 31 0045; Rapport de recherche; Scheduling is the process of allocating resources to activities over time. In a scheduling problem, resources are scarce and constrained in various ways (e.g. in the order of activities and the capacity of resources), and one is looking for a schedule of the activities that both satisfies the constraints and is optimal according to some criteria. This paper deals with an extension of a constraint-based scheduling model of real time management of train traffic through junctions and large stations. This extension allows the improvement of the model of conflicts between trains running in opposite directions with the use of state resources. To tackle large instances, a temporal decomposition has been used. We tested the model and algorithms by applying to problem instances of a real terminal station. Computational results show that with the temporal decomposition method we are able to obtain good solution in short computation time

  • Other research product . Other ORP type . 2018
    Open Access English
    Authors: 
    Bocher, Erwan; Petit, Gwendall; Picaut, Judicaël; FORTIN, Nicolas; GUILLAUME, Gwenael;
    Country: France

    Présentation du projet NoiseCapture dans le cadre du séminaire Immersion Sciences 2018, organisé conjointement par l’Académiede Rennes, la région Bretagne et le CNRS.

  • Open Access English
    Authors: 
    Tireau, Jonathan; van Schoors, Laetitia; Benzarti, Karim; Colin, Xavier;
    Publisher: HAL CCSD
    Country: France

    Le principal objectif de cette présente communication est de déterminer les conséquences de phénomènes complexes tel le couplage de la thermo- et photo-oxydation. Pour cette étude, nous nous sommes penchés sur le cas d'une gaine de polyéthylène chargée de noir de carbone et stabilisée avec un mélange classique d'antioxydants synergiques (Irganox 1010 + Irgafos 168), et ce après un vieillissement naturel d'un quart de siècle dans deux conditions d'ensoleillement distinctes: en présence et en l'absence de soleil (endroit sombre). The main objective of the present communication was to determine the consequences of such a complex thermo-photo-oxidation process in a polyethylene-carbon black sheath, stabilised with a classical synergetic antioxidant mixture (Irganox 1010 + Irgafos 168), after natural ageing during a quarter of century in two distinct sunshine conditions: in a presence and absence of sun (dark location).

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