Academic literature on the topic 'Vol – Simulateurs'
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Journal articles on the topic "Vol – Simulateurs"
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RUIZ, R., and C. LEGROS. "ANALYSE DE LA VOIX DE PILOTES EN SITUATION DE STRESS DANS UN SIMULATEUR DE VOL." Le Journal de Physique Colloques 51, no. C2 (February 1990): C2–527—C2–529. http://dx.doi.org/10.1051/jphyscol:19902124.
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Leclerc, Catherine, and Clément Gosselin. "ALGORITHME GÉNÉTIQUE MULTICRITÉRIEL POUR L’OPTIMISATION DE L’ARCHITECTURE DES MÉCANISMES ENTRAÎNÉS PAR CÂBLES - APPLICATION À UN SIMULATEUR DE VOL." Transactions of the Canadian Society for Mechanical Engineering 33, no. 4 (December 2009): 633–44. http://dx.doi.org/10.1139/tcsme-2009-0044.
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Hwang, Yoon Y., Karthikeyan Ramalingam, Diane R. Bienek, Valerie Lee, Tao You, and Rene Alvarez. "Antimicrobial Activity of Nanoemulsion in Combination with Cetylpyridinium Chloride in Multidrug-Resistant Acinetobacter baumannii." Antimicrobial Agents and Chemotherapy 57, no. 8 (May 13, 2013): 3568–75. http://dx.doi.org/10.1128/aac.02109-12.
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ABSTRACTAcinetobacter baumanniihas emerged as a serious problematic pathogen due to the ever-increasing presence of antibiotic resistance, demonstrating a need for novel, broad-spectrum antimicrobial therapeutic options. Antimicrobial nanoemulsions are emulsified mixtures of detergent, oil, and water (droplet size, 100 to 800 nm) which have broad antimicrobial activity against bacteria, enveloped viruses, and fungi. Here, we screened the antimicrobial activities of five nanoemulsion preparations against fourAcinetobacter baumanniiisolates to identify the most suitable preparation for further evaluation. Among them, N5, which contains 10% (vol/vol) Triton X-100, 25% (vol/vol) soybean oil, and 1% (wt/vol) cetylpyridinium chloride (CPC), showed the best efficacy againstA. baumanniiin both its planktonic and biofilm forms and was selected for further study. Our data demonstrate that, while the killing of planktonic forms ofA. baumanniiwas due to the 1% CPC component of our nanoemulsions, the breakdown of biofilms was achieved via the emulsified oil and detergent fractions. Furthermore, we documented the effect of ethanol and NaCl in combination with N5 on planktonicA. baumannii. In killing curves of N5 combined with other agents (ethanol or NaCl), a synergistic effect of a ≥2-log decrease in CFU/ml was observed. The antibiofilm activity of N5 was confirmed via a cell proliferation test and scanning electron microscopy. The effects of exposure to severe environmental conditions, which simulates the field conditions in Iraq and Afghanistan, were evaluated, and this exposure did not affect the overall antimicrobial activity of N5. These studies lay a solid foundation for the utilization of nanoemulsions against the antibiotic-resistant forms ofA. baumannii.
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Walbron, Paul, Benjamin Aisene, Stéphane Jullion, Olivier Roche, and François Sirveaux. "Progression des internes en simulation d’arthroscopie d’épaule : y a-t-il une place pour le simulateur de vol dans le transfert de compétences visio-spatiales?" Revue de Chirurgie Orthopédique et Traumatologique 103, no. 8 (December 2017): S245. http://dx.doi.org/10.1016/j.rcot.2017.09.306.
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Callewaert, Margot, Stefan Geerts, Evert Lataire, Jan Boone, Marc Vantorre, and Jan Bourgois. "Development of an Upwind Sailing Ergometer." International Journal of Sports Physiology and Performance 8, no. 6 (November 2013): 663–70. http://dx.doi.org/10.1123/ijspp.8.6.663.
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Purpose:To develop a sailing ergometer that accurately simulates upwind sailing exercise.Methods:A sailing ergometer that measures roll moment accompanied by a biofeedback system that allows imposing a certain quasi-isometric upwind sailing protocol (ie, 18 bouts of 90-s hiking at constantly varying hiking intensity interspersed with 10 s to tack) was developed. Ten male high-level Laser sailors performed an incremental cycling test (ICT; ie, step protocol at 80 W + 40 W/3 min) and an upwind sailing test (UST). During both, heart rate (HR), oxygen uptake (VO2), ventilation (VE), respiratory-exchange ratio, and rating of perceived exertion were measured. During UST, also the difference between the required and produced hiking moment (HM) was calculated as error score (ES). HR, VO2, and VE were calculated relative to their peak values determined during ICT. After UST, the subjects were questioned about their opinion on the resemblance between this UST and real-time upwind sailing.Results:An average HM of 89.0% ± 2.2% HMmax and an average ES of 4.1% ± 1.8% HMmax were found. Mean HR, VO2, and VE were, respectively, 80% ± 4% HRpeak, 39.5% ± 4.5% VO2peak, and 30.3% ± 3.7% VEpeak. Both HM and cardiorespiratory values appear to be largely comparable to literature reports during on-water upwind sailing. Moreover, the subjects gave the upwind sailing ergometer a positive resemblance score.Conclusions:Results suggest that this ergometer accurately simulates on-water upwind sailing exercise. As such, this ergometer could be a great help in performance diagnostics and training follow-up.
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Lewandowski, Dennis J., Amanda J. Hayes, and Scott Adkins. "Surprising Results from a Search for Effective Disinfectants for Tobacco mosaic virus–Contaminated Tools." Plant Disease 94, no. 5 (May 2010): 542–50. http://dx.doi.org/10.1094/pdis-94-5-0542.
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Over 100 years after its discovery, Tobacco mosaic virus (TMV) remains an economically important pathogen for producers of many vegetatively propagated crops including petunias (Petunia × hybrida). To directly address this concern, we have developed a robust system to determine efficacy of disinfectants for treating TMV-contaminated cutting tools using a combination of preliminary screens and replicated trials. Contrary to widely held beliefs, wild-type (wt) TMV and four additional tobamovirus species infected four petunia cultivars without producing obvious viral symptoms. In contrast, a petunia isolate of TMV with 99.0% (nucleotide) and 99.4% (amino acid) coat protein sequence identity to wt TMV produced symptoms on all but one tested cultivar. We also show that TMV transmission can occur up to the twentieth petunia plant cut following a single cutting event on a TMV-infected plant. Although many new products are now available, treatment of TMV-contaminated tools with a 20% (wt/vol) solution of nonfat dry milk (NFDM) plus 0.1% Tween 20 or a 1:10 dilution of household bleach (0.6% sodium hypochlorite), two “old standbys”, completely eliminated TMV transmission to petunias. Treatment of contaminated tools with 1% (wt/vol) Virkon S or 20% NFDM also significantly reduced the incidence of infected petunias. Other treatments identified in the preliminary screens are candidates for the second phase of screening that simulates contamination during the process of taking cuttings.
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Kilian, Markus, Sabine Brinkop, and Patrick Jöckel. "Impact of the eruption of Mt Pinatubo on the chemical composition of the stratosphere." Atmospheric Chemistry and Physics 20, no. 20 (October 16, 2020): 11697–715. http://dx.doi.org/10.5194/acp-20-11697-2020.
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Abstract. This article describes the volcanic effect of the Mt Pinatubo eruption in June 1991 on the ozone (O3) and methane (CH4) distribution in the stratosphere, as simulated with the chemistry–climate model EMAC (ECHAM/MESSy Atmospheric Chemistry: ECHAM5, version 5.3.02; MESSy, version 2.51). In this study, the effects of volcanic heating and heterogeneous chemistry on the chemical composition, caused by the volcanic aerosol, are separated. Global model simulations over the relevant period of the eruption from 1989 to 1997 with EMAC in T42L90MA resolution with specified dynamics and interactive chemistry were performed. The first simulation (VOL) contains the volcanic perturbation as an additional aerosol load and thus simulates the interaction of the aerosol with the chemistry and the radiation. The second simulation (NOVOL) neglects the eruption and represents the undisturbed atmosphere. In the third simulation (CVOL) the volcanic aerosol only interacts with the heterogeneous chemistry, such that volcanic heating is omitted. The differences between the simulation results VOL−NOVOL describe the total effect of the Mt Pinatubo eruption on the chemical composition, VOL−CVOL the stratospheric heating effect, and CVOL−NOVOL the chemical effect of the aerosol on the heterogeneous chemistry. The post-volcanic stratosphere shows a decrease in the O3 column in the tropics and an increase in the midlatitudes and polar regions, lasting roughly 1 year. This change in the ozone column is solely a result of the heating effect. The subsequent decrease in the ozone column is related to the chemical effect. The contribution of the catalytic loss cycles (NOx, HOx, ClOx, and BrOx) on the depletion of O3 is analysed in detail. In the tropics, CH4 increases in the upper stratosphere because of stronger vertical transport.
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Maghbouleh, Neda, Clayton Childress, and Carlos Alamo-Pastrana. "'Our Table Factory, Inc.': Learning Marx through role play." Learning and Teaching 8, no. 2 (June 1, 2015): 5–28. http://dx.doi.org/10.3167/latiss.2015.080202.
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Marx's critique of capitalism remains foundational to the university social science curriculum yet little is known about how instructors teach Marx. In post-industrial, service-oriented economies, students are also increasingly disconnected from the conditions of industrial capitalism that animate Marx's analysis. Inspired by the discussion of how a piece of wood becomes a table in Marx's Capital Vol. 1., 'Our Table Factory, Inc.' simulates a diverse array of roles in the chain of production into and out of a table factory to understand key concepts: means/mode of production, use/exchange value, primitive accumulation wage/surplus labour, proletariat, bourgeoisie, alienation, false consciousness, commodity fetishism and communist revolution. We describe the exercise and present qualitative and quantitative assessment data from introductory sociology undergraduates across three small teaching-intensive universities in the United States. Findings detail the exercise's efficacy in fostering retention of material and in facilitating critical engagement with issues of inequality.
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Hua, Ze Jia, Na Huang, and Ju Gao. "Characteristics Research of Gas-Liquid Two Phase Flow Based on the VOF Model in T Tube." Applied Mechanics and Materials 448-453 (October 2013): 3073–77. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.3073.
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Using numerical simulation method, under the adiabatic condition, this paper simulates the of the upstream gas liquid two phase flow in main tube of hydraulic diameter 1 mm T tube. Superficial gas velocity within 0.01~30m/s and fluid velocity within 0.01~5m/s, under simulated by two kinds of gas volume fraction, air-water flow diagram and the flow pattern transition boundary have been got from the simulation. By comparing the simulation results, it shows that under the same environment, small channel volume fraction of gas has important influence on convection type transition boundaries.
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Goudy, Sean, S. O. Bade Shrestha, and Iskender Sahin. "The Reactant Concentration Simulation at Catalyst Membrane Interface of a MICRO PEM Fuel Cell." Journal of the Institute of Engineering 9, no. 1 (June 28, 2014): 1–17. http://dx.doi.org/10.3126/jie.v9i1.10662.
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Modeling is increasingly widely used to optimization, improvement and cost reduction efforts of the fuel cell technology. Although there are many computational models in literature that describe the behavior of Polymer Electrolyte Membrane (PEM) fuel cell, there is a only few models that simulates the catalyst surface concentration of reactant gases at the catalyst-membrane layer interface. A modeling of a PEM fuel cell is presented to determine both the bulk reactant concentrations and the catalyst surface concentrations at the catalyst layer-membrane layer interface. The results suggest that the reactant deficiencies experienced at high current densities are localized to the catalyst surface. However, the bulk concentration of reactant is not zero, and, in most cases, the bulk concentration of the reactant gases is significantly greater than zero. In actuality, it is the catalyst surface, which is being depleted of reactant, and, at the limiting current density, the surface concentrations of reactant gases are zero. This treatment develops explicitly link between the fuel cell overpotentials and the movement of reactants. DOI: http://dx.doi.org/10.3126/jie.v9i1.10662Journal of the Institute of Engineering Vol. 9, No. 1, pp. 1–17
Dissertations / Theses on the topic "Vol – Simulateurs"
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Pedrali, Mauro. "Vers un environnement multimédia pour l'analyse vidéo des causes d'erreurs humaines : application dans les simulateurs d'avions." Toulouse 1, 1996. http://www.theses.fr/1996TOU10056.
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Ce travail concerne le développement d'une approche méthodologique et d'un outil pour l'analyse vidéo des causes d'erreur humaine. Ce prototype a été intégré dans un environnement multimédia pour l'analyse des incidents accidents. Notre approche repose sur un modèle cognitif et sur une classification d'erreurs humaines. La classification permet de reconstruire les enchainements causaux au travers desquels les erreurs latentes, combinées avec les aspects cognitifs, donnent lieu aux erreurs actives. L'outil se compose d'un organisateur des données et d'un analyseur. L'organisateur permet d'agencer les données concernant les erreurs, tandis que l'analyseur permet de tracer graphiquement (sous forme d'arborescence) les processus cognitifs qui ont amené aux erreurs. L'outil a été incorporé dans un environnement multimédia intégrateur dont l'architecture a été conçue conjointement à l'outil. Cet environnement s'appuie sur un système multimédia de haut niveau à l'aide duquel un analyste numérise et décompose en séquences l'enregistrement vidéo concernant un incident accident afin de créer des scenarios d’analyse. Dans la base de données sont archives sur trois niveaux différents les scenarios vidéo, les informations issues de l'organisateur et les résultats de l'analyse des causes. L'environnement sert de structure d'accueil a d'autres outils (organisateur et analyseur) supportant différentes méthodes d'analyse de l'activité humaine. L'outil a été testé sur une étude de cas concernant l'analyse de séquences vidéo enregistrées dans un simulateur d'avion. La simulation a permis de recréer assez fidèlement les conditions de travail qui existent dans un cockpit, y compris les situations d'urgence. Bien que des tests complets d'utilisabilité soient nécessaires pour une validation incontestable de l'outil, cette étude nous a fourni un premier retour d'expérience qui a montré l'intérêt capital d'une approche permettant de discerner l'ensemble des causes responsables d'une erreur et de reconstruire leurs enchainements dans les processus cognitifsThis research concerns the development of a methodological approach and of a software tool for video analyses of human error causes. We integrated this tool within a multimedia environment for accident incident investigations. Our approach relies on a cognitive model and on a classification of human errors. The classification allows to reconstruct the causal chains through which latent failures, combined with cognitive aspects, give rise to active failures. We implemented this approach in a tool composed of a data organizer and an analyzer. While the organizer supports the arrangement of data concerning errors, the analyzer helps in tracing the causal chain leading to errors as a fault tree. We integrated the tool within a multimedia environment whose architecture was conceived together with the tool. This environment relies on desktop for digital video editing and on a relational database, for the storage of the results. We have structured the database on three levels, each one in relation with a precise step of a video analysis. The expert stores the scenarios at level 1 (sorted data) ; the information coming from the organizer at level 2 (organizers and analyzers) that are supposed to be used on the same set of video recordings, but whose final results (in terms of data organization and analysis) are assumed to be stored separately. We tested the tool and the multimedia environment on a case study concerning the analysis of video sequences recorded in a full flight simulator. Though usability tests are necessary to completely validate david - from the point of view of its utilization and the accuracy of the results we can obtain, this study gave us a first feedback. The acknowledged advantage in this type of analysis shows the fundamental interest to discern the set of causes responsible of an active failure, and the reconstruction of the causal chain in the cognitive process
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Doré, Cyntia. "Étude de la transmissibilité d'attaches de simulateurs de vol." Mémoire, Université de Sherbrooke, 2008. http://savoirs.usherbrooke.ca/handle/11143/1424.
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Les simulateurs de vols sont très utilisés dans la formation des pilotes de lignes. Ces simulateurs reproduisent les différentes conditions de vol qu'un pilote pourrait avoir à faire face dans une situation réelle. Il est donc important qu'ils soient très représentatifs de la réalité. Le mouvement est simulé par l'action de vérins entraînant la cabine et créant l'illusion d'être dans un vrai appareil. Cependant, les vérins utilisés peuvent produire beaucoup des vibrations et l'utilisation d'isolateurs reliant les vérins à la cabine peut devenir nécessaire. Le but de cette étude était d'établir un modèle dynamique permettant l'amélioration et l'optimisation des performances d'isolateurs sur un simulateur de vol afin de minimiser le bruit à l'intérieur de l'habitacle. Pour ce faire, un modèle analytique du système vérins-isolateur-cabine a été établi. Ce dernier permet de calculer la position d'équilibre du système ainsi que de déterminer la transmissibilité en force sur la cabine. Le logiciel ANSYS a permis de valider ce modèle. Afin d'optimiser les isolateurs, il est important de s'assurer que les fréquences de résonance du système ne soient pas dans une gamme de fréquence non désirée. Pour ce faire, l'impact de la variation de différentes propriétés du système sur la position des fréquences de résonance a été étudié. Par exemple, en diminuant la masse de l'isolateur de 50%, une augmentation allant jusqu'à 25% de la position des fréquences de résonances est observée. De plus, un déplacement vers la droite du centre de gravité de l'isolateur de 50% amène les pics de résonances à se déplacer d'environ 45% vers la droite tandis qu'un changement de raideur des composantes élastiques les déplacent de 5% à 60%.
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Leclerc, Catherine. "Analyse et optimisation des mécanismes parallèles entraînés par câbles : application au simulateur de vol." Thesis, Université Laval, 2009. http://www.theses.ulaval.ca/2009/25926/25926.pdf.
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Ce projet de recherche vise à l’élaboration de nouveaux outils de détermination de l’espace atteignable d’un mécanisme à câbles, pour une application de simulateur de vol. On introduit d’abord la théorie des simulateurs de vol afin de bien saisir les besoins en terme de plate-forme de génération de mouvement. Ensuite, on présente brièvement les mécanismes à câbles comme solution potentielle aux lacunes des simulateurs de vol actuels. S’en suit le développement de plusieurs outils d’évaluation des mécanismes à câbles, puis l’utilisation de ces outils à l’intérieur d’une optimisation multicritérielle visant à déterminer une architecture optimale. On présente l’architecture ainsi obtenue et enfin, on discute du prototype fabriqué au Laboratoire de Robotique de l’Université Laval.
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Daussin, Guillaume. "Génération multi-modélisations et visualisation multi-rendus de systèmes d’informations géographiques : applications aux simulateurs de vol." Rennes 1, 2009. http://www.theses.fr/2009REN1S140.
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Cette thèse traite de l’accroissement du réalisme des images produites par des simulations de vol exploitant des Systèmes d’Informations Géographiques (SIG). Nous proposons de faire cohabiter plusieurs techniques de modélisation afin d’optimiser la description des objets de l’univers et d’exploiter conjointement plusieurs techniques de visualisation s’accordant avec les modélisations choisies. Les données géographiques ont été structurées en regroupant les objets en « couches » optimisées et interfacées avec les systèmes de simulation et de visualisation. Cela permet d’améliorer la qualité graphique des objets et d’agir dynamiquement sur la base de données depuis la simulation. Il est ainsi possible de voir des modifications géométriques ou des insertions d’objets dans le SIG se répercuter « on-line »dans la visualisation. L’interactivité et le dynamisme du système contribuent à réduire le cycle de production des images de synthèseThis thesis deals with the image realism enhancement in flight simulators using geographical information systems (GIS). The suggestion here is to implement different modeling techniques together in order to optimize object description. We also suggest using different rendering techniques that complement each chosen modeling technique. The geographical data is structured by bringing together objects into “layers”. These layers are optimized in order to create an interface between the simulation and the visualization systems. This structure improves the graphical quality of the objects and allows the simulation to act dynamically on the virtual world database. It is thus possible to perform geometrical deformations of objects in the GIS and to watch how those changes effect the visualization, on the one hand, and to insert, on the fly, new data into the SIG on the other hand. The dynamics and interactivity of the system lead to a reduction of the process of image synthesis production
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Giocanti-Belmonte, Christophe. "Impact de l'anxiété sur la conscience de la situation : étude chez les pilotes privés." Toulouse 2, 2006. http://www.theses.fr/2006TOU20066.
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La thèse étudie les effets de l’anxiété trait sur la conscience de la situation, sur une population de pilotes privés. L’objectif principal de cette étude est de montrer que l’anxiété a un effet sur les capacités d’anticipation (le niveau 3 de la conscience de la situation). Elle repose sur une étude empirique qui inclut une analyse de performances explicites et une analyse de performances implicites. Dans un premier temps il a été demandé aux pilotes (n=50) d’effectuer un vol sur simulateur et nous avons mesuré la performance grâce à un enregistreur de paramètres. Cette première analyse traite des aspects explicites de la conscience de la situation. Dans un second temps, nous avons procédé à une mesure de mémoire implicite avec une tâche de complétion de fragments de mots. Plusieurs résultats suggèrent que les liens qui unissent l’anxiété trait et la performance sont non linéaires et qu’un niveau modéré d’anxiété améliore la performance. La discussion souligne l’importance de la prise en compte des émotions dans une perspective de prévention dans le domaine de la sécurité du transport aérienThe work deals with the effects of trait anxiety on situation awareness, in a private pilot population. The main objective of this study is to show that anxiety has an effect on projection skills (the third level of situation awareness). It includes an empirical study which is based on an explicit performance analysis and an implicit performance analysis. In the first analysis, pilots (n=50) were asked to perform a simulated flight. Performance was assessed through a parameter recorder. This first analysis is about explicit aspects of situation awareness. In a second analysis we carried out the study with an evaluation of implicit memory through a word-fragment completion task. Several results show that trait anxiety and performance are linked in a non linear way, and that a mild level of anxiety seems to improve performance. The discussion emphasizes the role and the need of comprehension of emotion as a way of contributing to improve flight security
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Aouati, Amar. "Utilisation des technologies vocales dans une application multicanaux." Paris 11, 1985. http://www.theses.fr/1985PA112373.
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Le travail mené vise à réaliser un système, effectivement utilisable, de compréhension du langage employé par les contrôleurs aériens dans les échanges verbaux avec les pilotes. Dans cette optique sont utilisées des méthodes classiques d'intelligence artificielle adaptées à des systèmes de reconnaissance et de synthèse de la parole. Le système vise à interpréter le langage de travail, dont il utilise les contraintes. Le locuteur respecte des contraintes de débit pour la prononciation, et les règles de la "phraséologie" employée pour la formulation des phrases. Le système est entouré de plusieurs outils qui permettent de l'utiliser de façon opérationnelle : aide à la définition du langage de l'application, aide à la construction du vocabulaire de référence. Les options prises pour la réalisation du prototype 0 du terminal vocal intelligent ont permis un dialogue effectif avec un délai de réponse qui autorise le temps réel.
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Prévost, Carole Gabrielle. "UAV Optimal Cooperative Obstacle Avoidance and Target Tracking in Dynamic Stochastic Environments." Thesis, Université Laval, 2011. http://www.theses.ulaval.ca/2011/27964/27964.pdf.
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Baldesi, Gianluigi. "Modélisation, commande et simulation des lanceurs : du linéaire au non linéaire." Toulouse, ISAE, 2008. http://www.theses.fr/2008ESAE0002.
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Après une vue d‘ensemble sur l'histoire des fusées et le nouveau lanceur européen VEGA, le problème du pilotage pendant le vol atmosphérique est abordé. Partant de la formulation la plus complexe, plusieurs hypothèses sont avancées, pas à pas, afin d‘obtenir plusieurs modèles de dynamique dans des conditions d'opération différentes. Différents effets dynamiques, tels que le jet-damping, la dynamique structurale, la linéarisation et le découplage, sont présentés, de façon exhaustive. Basés sur cette étude théorique, plusieurs modèles mathématiques (linéaire découplé, linéaire couplé et non linéaire couplés), sont dérivés pour un lanceur similaire à VEGA. En outre, un simulateur de vol haute fidélité moderne, basé sur un logiciel multi-corps (DCAP) et actuellement utilisé à l'ESA, est décrit en détails. Après les étapes de synthèse-analyse-validation utilisant le «gain-scheduling», diverses techniques avancées sont étudiées pour le pilotage d'un lanceur ayant une vitesse de roulis non négligeable par orientation de la poussée avec une tuyère orientable. La technique de commande robuste modale est ensuite étudiée, à partir de la théorie linéaire. De plus, deux lois de commande basées sur la théorie non linéaires, linéarisation par bouclage et nouvelle technique de commande suboptimale, méthode de ϑ-D, sont également analysés. Afin d'analyser le comportement de système commandé contre des incertitudes de paramètres, une linear fractional transformation (LFT) préliminaires sont dérivées «localement» autour des points d‘équilibre et «globalement» pour la toute trajectoire. Finalement, toutes les lois de commande, dérivées dans cette thèse, sont testées avec le simulateur du vol dans différentes conditions. Pour faciliter l'évaluation des différentes stratégies de commande, nous présentons ensuite une méthodologie franche basée sur deux indexes (inexactitude et consommation), qui récapitulent le comportement de système entier.
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Thériault, Olivier. "Intégration d'un système vidéo de poursuite de cible à un simulateur "hardware in the loop" d'avion sans pilote et évaluation d'algorithmes de surveillance." Thesis, Université Laval, 2010. http://www.theses.ulaval.ca/2010/27137/27137.pdf.
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Gerbaud, Stéphanie. "Contribution à la formation en réalité virtuelle : scénarios collaboratifs et intégration d'humains virtuels collaborant avec des utilisateurs réels." Phd thesis, INSA de Rennes, 2008. http://tel.archives-ouvertes.fr/tel-00475589.
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La formation industrielle est un domaine applicatif émergent pour la réalité virtuelle. GVT (Generic Virtual Training) est une plateforme de création d'environnements virtuels permettant une formation individuelle à des procédures industrielles de type maintenance. Cependant, les demandes industrielles évoluent et un nouveau besoin concerne la formation à des procédures collaboratives. Dans cette thèse nous proposons des modèles pour étendre les possibilités de GVT à la formation à des procédures collaboratives où des utilisateurs réels collaborent avec des humains virtuels. Nous présentons un modèle de l'activité des acteurs permettant de remplacer dynamiquement un apprenant par un humain virtuel. Ce modèle permet à un acteur de réaliser des actions en tenant compte de ses caractéristiques, du scénario, de l'environnement ainsi que de l'activité de ses partenaires. Nous proposons également une extension du langage de scénario LORA afin de décrire un scénario collaboratif. Un tel scénario décrit l'assignation des personnes aux actions et intègre des actions collaboratives. Le scénario a également été simplifié en rendant implicites des actions basiques comme la prise et la pose d'outils. Enfin, nous présentons le mécanisme de sélection d'action que nous avons mis en place et dont l'objectif est double : permettre à un humain virtuel de sélectionner une action à réaliser et donner des conseils à l'apprenant sur l'action à choisir. Il se compose de deux parties~: un module global de répartition des actions, chargé de déterminer le meilleur candidat pour chaque action du scénario, et des modules décisionnels dont dispose chaque acteur. Un acteur va ainsi se servir de son profil collaboratif (ensemble de règles de comportement) et de la suggestion du module de répartition pour choisir la prochaine action qu'il souhaiterait réaliser.Ces différents modèles ont été intégrés à GVT au sein d'un prototype. Dans cette thèse nous présentons un scénario applicatif réalisé dans GVT qui consiste à monter collaborativement un meuble livré en kit.
Book chapters on the topic "Vol – Simulateurs"
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Samsonow, Elisabeth von. "The Plasticity of the Real: Speculative Architecture." In Speculative Art Histories. Edinburgh University Press, 2017. http://dx.doi.org/10.3366/edinburgh/9781474421041.003.0007.
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Von Samsonow argues that architecture can play an important role in the framework of contemporary speculative philosophy as it is founded on geology. Speculative philosophy might engage architecture to rediscover and reintegrate the geo-historical foundations of being as well as of architecture. Contemporary architecture is critizised being largely driven by a feeling of resentment towards the earth. Architecture is of ontological interest because it borrows its key function from geology; from the arrangement of various materials, offering spaces or biotopes. In contemporary architecture however, this function got lost. Whereas old architecture seeks to ground dwelling in the earth and invites our bodies to understand what the earth can be to it, contemporary architecture disregards the body and is fixated on the eye, making architecture an issue of vision. Contemporary architecture is pure pornography; it simulates sensations and affirms the logic of capitalism. It degenerates the original earth to dirt and replaces it with an artificial earth, that is erected upwards in the form of an overground, which forms the anti-thesis to the earth. Von Samsonow calls this the 'takeoff strategy' of contemporary architecture. Because it is driven by a theoretical pre-oedipalization, speculative philosophy may play an important role in the regrounding of contemporary architectures takeoff strategy. To understand this we have to look at Meillassouxs concept of the ancestral object, that gives us the existence of the earth prior to thought and knowledge. Von Samsonow interprets this ancestral object as a symbolic mother, in order to open up the possiblity of thinking the earth in terms of universal generation. From the point of view of the earth itself, it is filled up with objects generated by her; there is no distinction between organic and inorganic or between (natural) generation and (technical) production. Von Samsonow calls the quest for ancestrality the gaia-istic turn in speculative philosophy. This turn has revolutionary potential.
Conference papers on the topic "Vol – Simulateurs"
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Das, Kaushik, Ron Janetzke, Debashis Basu, Steve Green, and John Stamatakos. "Numerical Simulations of Tsunami Wave Generation by Submarine and Aerial Landslides Using RANS and SPH Models." In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-79596.
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Tsunami wave generation by submarine and aerial landslides is examined in this paper. Two different two-dimensional numerical methods have been used to simulate the time histories of fluid motion, free surface deformation, shoreline movement, and wave runup from tsunami waves generated by aerial and submarine landslides. The first approach is based on the Navier-Stokes equation and the volume of fluid (VOF) method: the Reynolds Averaged Navier-Stokes (RANS)-based turbulence model simulates turbulence, and the VOF method tracks the free surface locations. The second method uses Smoothed Particle Hydrodynamics (SPH)—a numerical model based on a fully Lagrangian approach. In the current work, two-dimensional numerical simulations are carried out for a freely falling wedge representing the landslide and subsequent wave generations. Numerical simulations for the landslide-driven tsunami waves have been performed with different values of landslide material densities. Numerical results obtained from both approaches are compared with experimental data. Simulated results for both aerial and submerged landslides show the complex flow patterns in terms of the velocity field, shoreline evolution, and free-surface profiles. Flows are found to be strongly transient, rotational, and turbulent. Predicted numerical results for time histories of free-surface fluctuations and the runup/rundown at various locations are in good agreement with the available experimental data. The similarity and discrepancy between the solutions obtained by the two approaches are explored and discussed.
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Myong, Hyon Kook. "Numerical Simulation of Multiphase Flows With Material Interface on Unstructured Grid System." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-04032.
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Two-dimensional multiphase flows with material interface due to density difference are numerically simulated on unstructured grid system by an in-house solution code (PowerCFD). This code employs an unstructured cell-centered method based on a conservative pressure-based finite volume method and adopts a high resolution method (CICSAM) in a volume of fluid (VOF) scheme for the accurate phase interface capturing. The test cases are the Rayleigh-Taylor instability (density ratio of 2), the oil bubble rising in a partially filled container (density ratio of 2), the air bubble rising in a fully filled container with bubble shedding (density ratio of 100) and the droplet splash (density ratio of about 1000), which are typical benchmark problems among multiphase flows with material interface due to density difference. The present results are compared with other numerical solutions found in the literature. It is found that the present method simulates efficiently and accurately complex interface flow such as multiphase flows with material interface due to both density difference and instability.
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St-Georges, Lyne, and G. L. Ostiguy. "Effects of Initial Geometric Imperfections on Parametric Instability of Rectangular Plates." In ASME 2001 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/detc2001/vib-21551.
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Abstract The authors present a rational analysis of the effect of initial geometric imperfections on the dynamic behaviour of rectangular plates activated by a parametric excitation. This subject has been extensively investigated theoretically in the past, but no experimental data seems to be complete enough to validate the theory. The main objective of this investigation is to fill this void by performing experimental tests on geometrically imperfect plates, and to highlight the geometric imperfection’s influence on resonance’s curves. The study is carried out for an isotropic, elastic, homogeneous, and thin rectangular plate. The plate under investigation is subjected to the action of an in-plane force uniformly distributed along two opposite edges, is initially stress free and simply supported. Theoretical calculation and experimental tests are performed. In the theoretical approach, a dynamic version of the Von Kármán non-linear theory is used to evaluate the lateral displacement of the plate. The test rig used in the experimentation simulates simply supported edges and can accept plates with different aspect ratio. The test plates are pre-formed with lateral deflection or geometrical imperfections, in a shape corresponding to various vibration modes. Comparison between experimental and theoretical results reveals good agreement and allows the determination of the theory’s limitations. The theory used correctly describes the behaviour of the plate when imperfection amplitude is inferior to the plate thickness.
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Wang, Zhenfeng, Peigang Yan, Hongyan Huang, and Wanjin Han. "Conjugate Heat Transfer Analysis of a High Pressure Air-Cooled Gas Turbine Vane." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-23247.
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The ANSYS-CFX software is used to simulate NASA-Mark II high pressure air-cooled gas turbine. The work condition is Run 5411 which have transition flow characteristics. The different turbulence models are adopted to solve conjugate heat transfer problem of this three-dimensional turbine blade. Comparing to the experimental results, k-ω-SST-γ-θ turbulence model results are more accurate and can simulate accurately the flow and heat transfer characteristics of turbine with transition flow characteristics. But k-ω-SST-γ-θ turbulence model overestimates the turbulence kinetic energy of blade local region and makes the heat transfer coefficient higher. It causes that local region temperature of suction side is higher. In this paper, the compiled code adopts the B-L algebra model and simulates the same computation model. The results show that the results of B-L model are accurate besides it has 4% temperature error in the suction side transition region. In addition, different turbulence characteristic boundary conditions of turbine inner-cooling passages are given and K-ω-SST-γ-θ turbulence model is adopted in order to obtain the effect of turbulence characteristic boundary conditions for the conjugate heat transfer computation results. The results show that the turbulence characteristic boundary conditions of turbine inner-cooling passages have a great effect on the conjugate heat transfer results of high pressure gas turbine. ANSYS is applied to analysis the thermal stress of Mark II blade which has ten radial cooled passages and the results of Von Mises stress show that the temperature gradient results have a great effect on the results of blade thermal stress.
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Oh, Sang Hyun, Sung Il Kim, Ki Ho Park, and Byeong Hyeok Yu. "A Numerical Study on Improvement of Coating Uniformity by Controlling the Pressure at the Exit of the Slot Die Nozzle." In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-5139.
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Abstract In this study, numerical analysis was carried out to investigate the effects of slot die nozzle exit rear pressure on coating uniformity improvement in coating nozzles which are widely used in industry. Coating uniformity in coatings of viscosity materials such as inks and surface coating solutions is closely related to the quality of the product. Especially, coating uniformity is an important performance indicator for slot die coatings, which are used primarily in the production of optical or chemical products such as displays, touch screens, solar panels, and batteries. In general, the average thickness of a thin film in a slot die coating is determined by the supply flow rate and the moving speed of the plate. However, due to various parameters, thickness irregularities and coating defects due to pores occur locally. Therefore, many studies have recently been performed to solve the local defect of the slot die coating. In order to improve the coating uniformity, this study applied the vacuum pressure condition to the slot die nozzle rear end and numerical study on the coating uniformity according to the vacuum pressure was carried out. The numerical analysis proceeded to 2-D, unsteady condition and the VOF method. A commercial numerical simulation software (STAR-CCM+ V.12.06) was used. It was simulated that the coating liquid was supplied onto the moving plate surface. The moving plate speed was fixed 0.01m/s. The nozzle geometry simulates a slot die nozzle. And the coating raw material supply flow rate was considered for two conditions (0.005, 0.006m/s). Two vacuum pressure conditions (−3, −300Pa) were applied to the rear end of the nozzle. The viscosity of the viscous material was fixed at 2 Pa.s. The analysis results were analyzed through the uniformity of the material supplied to the surface. As a result of analysis, uniformity of coating was lowered regardless of the velocity when the vacuum pressure condition was −3.0 Pa, and uniformity was lowered as the velocity increased. However, it was confirmed that uniformity of the coating was increased at all velocity condition when the vacuum pressure condition was −300 Pa. This is because as the flat plate moves, the reverse pressure is applied to the downstream of the coating solution, thereby improving the uniformity of the coating liquid flowing through the flat plate and preventing the inflow of air or the like. Through this study, it was confirmed that the coating uniformity can be improved by controlling the vacuum pressure at the rear end of the nozzle.
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Mucci, Alberto, Foster Kwame Kholi, Man Yeong Ha, Jason Chetwynd-Chatwin, and June Kee Min. "Numerical Analysis of the Phase-Change Heat Transfer Inside a Pulsating Heat Pipe With Overcritical Number of Turns." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-15332.
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Abstract The Pulsating Heat Pipe (PHP) is a promising device in the family of heat pipes. With no need for a wick, they exhibit a high heat transfer to weight ratio. Moreover, the wickless design removes limits commonly associated with conventional heat pipes, increasing the maximum power transfer per single heat pipe. These peculiarities make it an ideal candidate for many high power applications. Nonetheless, there is though only partial knowledge on the driving mechanism, which restricts prediction accuracy. Most Pulsating Heat Pipe studies rely on experiments to test configurations, while simulations usually depend on semi-empirical correlations or adaptations of reduced theoretical models. Experiments provide detailed data for a particular geometry in lab fixed conditions, but it offers limited flexibility to test alternative configurations. Semi-empirical models use previous experimental data to create non-dimensional formulations. Though approaching an increased set of conditions, correlations apply with reasonable accuracy only to a small range, outside of which the prediction ability progressively falls. High order numerical analysis such as Computational Fluid Dynamics (CFD) modeling could potentially provide full visualization, but due to the complex flow behavior, previous studies used this method only in simple configurations with a small number of turns. The present research will expand the potential of this modeling technique by presenting the CFD analysis of a complex Pulsating Heat Pipe configuration. The importance of this study lies in the fact that this configuration, with a number of turns greater than a critical parameter, shows a reduced sensitivity to gravity and is therefore particularly important for applications where restrictions on installations make the positioning sub-optimal. The research simulates using a CFD commercial software a two-dimensional Pulsating Heat Pipe with sixteen turns. The heat pipe, with a 2 mm internal diameter, is filled with water at 50% of mass. To visualize the oscillation pattern of liquid and vapor slugs and plugs inside the Pulsating Heat Pipe, the model performs a transient analysis on the device. A Volume of Fluid (VOF) solver for multiphase analysis, coupled with the Lee model for evaporation and condensation mass transfer, calculates the interactions between the liquid and the gas phase inside the tube. The study follows the geometric and operational conditions from previous experiments. The analysis regards a Pulsating Heat Pipe operating in a vertical position with the condenser section placed in the upper sector. During the initial operations, the system flow distribution fluctuates between different flow modes as the fluid slugs and plugs structure forms. After stabilizing the heat transfer results well agree with the tested values. Moreover, the increased resolution allows us to fully visualize the internal operation, retrieving additional information on the temperature and ratio of liquid and gas phase along the heat pipe.