Dissertations / Theses on the topic 'Systèmes dynamiques hybrides – Simulation par ordinateur'
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Escude, Bruno. "Modélisation et simulation à évenements discrets de systèmes hybrides." Aix-Marseille 3, 2000. http://www.theses.fr/2000AIX30017.
Full textZainea, Marius. "Du composant à l’automate hybride pour la modélisation et la simulation des systèmes en commutation : application à l’électronique de puissance." Rennes 1, 2008. https://tel.archives-ouvertes.fr/tel-00351851.
Full textThe goal of this thesis is to provide a systematic method that finds an explicit model for electronic power converters in the context of hybrid dynamical systems. This study has been triggered by the wide integration of these devices in control in a large area of applications (e. G. The power supplies for PCs, mobile phones and DC motors, medical use equipment, TGVs, aeronautics, etc. ) and the latest interest from the control engineering community in addressing this kind of problems from the hybrid systems point of view. In order to achieve the objective, the present work integrates in a compositional approach previous results issued from energy based formalisms like the bond graphs with a new switch model that enhances the logical commutation conditions. The proposed method provides a generic solution for the modelling and the simulation phases of electronic power converters, from simple ones, as the “buck”, the “boost”, the “buckboost”, to more complex resonant converters, one such converter issued from medical imaging being used as a case study
Zhang, Lu. "Optimisation du dimensionnement de centrales hybrides de production d'énergie électrique associant les énergies renouvelables et traditionnelles sur un territoire donné." Le Havre, 2013. http://www.theses.fr/2013LEHA0006.
Full textThe rapid depletion of conventional energy sources , increasing global demand for energy and the fight against emissions in recent years have renewed interest in the development of renewable energy sources. In this context, the objective of this work is to contribute to finding solutions to the problem of Sizing Electric Hybrid Systems Dispersed Generation of Electricity (SEHPRE) by combining renewable and conventional sources for remote sites where the price of the extension is prohibitive. Our approach has been to formulate the problem of sizing SEHPRE in a nonlinear constrained optimization problem whose main objective function is the total cost of SEHPRE over 20 years. After a review, based on a scientific literature, the energy models of various elements constituting a SEHPRE are developed based on available meteorological data. The program OPTISEH dedicated to the sizing optimization of SEHPRE was then developed and implemented in MATLAB®. This code has been tested under the design of several structures SEHPRE to satisfy the consumption profile of a residential unit on a small power site in the region of Le Havre. Finally and for each optimal structures SEHPRE obtained a detailed analysis linking these solutions to the site and energy resources consumption profile was performed and discussed their relevance
Aljarbouh, Ayman. "Accelerated simulation of hybrid systems : method combining static analysis and run-time execution analysis." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S033/document.
Full textThis thesis deals with Zeno behavior of hybrid systems, and it has four main contributions : a method of eliminating "chattering" phenomena of hybrid automata, by computing an equivalent dynamics using a new convexification approach ; a method for accelerating the simulation of geometric-Zeno behavior in which the solution converges to a Zeno limit point according to a geometric series ; a proof of preservation by the above methods of a semantics of hybrid automata based on non-standard analysis ; a development of three prototype software, one in the form of a Simulink library, the other in the form of an FMI simulation environment, and the third being an implementation of the regularization method in the Modeling and simulation tool Acumen
Tekobon, Jerry. "Système multi physique de simulation pour l'étude de la production de l'énergie basée sur le couplage éolien offshore-hydrolien." Thesis, Le Havre, 2016. http://www.theses.fr/2016LEHA0031/document.
Full textThe thesis work concerns the development of a real-time emulation platform for theoretical and experimental studies of offshore wind and tidal power hybrid systems. Various energy coupling architectures are processed on the basis of the functional similarities of two systems and by both numerical and experimental emulation concepts. The notion of accelerated time used for real time simulation has been developed. The concept was validated on the experimental platform using the evolution of the mean power delivered by a small wind turbine. This approach can reduce the observation times of the measurement campaigns and could accelerate the studies for the wind potential of developing sites. We have also developed two types of coupling of the wind-tidal hybrid system. An electrical coupling based on the connection in parallel on a continuous bus of two turbines. We have developed an innovative concept of an electromechanical coupling based on the use of a single asynchronous generator on which the wind turbine and tidal turbine are simultaneously coupled. For this purpose, a vector-controlled servomotor was used to emulate the wind turbine while a synchronous motor was used as a tidal turbine emulator. The generator shaft is used as a mechanical coupling between the two systems. We have demonstrated in the experiments that we have developed the complementarity of the electrical productions of the two systems; we highlighted the need to add a storage system to compensate the simultaneous decrease of the two energy productions. The real time simulations results allow us to validate the feasibility of such a coupling
El, Guezar Fatima. "Modélisation et simulation des systèmes dynamiques hybrides affines par morceaux : exemples en électronique de puissance." Toulouse, INSA, 2009. http://eprint.insa-toulouse.fr/archive/00000316/.
Full textPiecewise affine hybrid systems are an important and simple class of hybrid dynamical systems. A piecewise affine system is composed of several dynamical affine subsystems and of switching rules that decide the behavior of the active subsystem during each switching interval. Recently, it has been shown that this class of systems is very rich in nonlinear phenomena such as bifurcations and chaos. Piecewise affine hybrid systems arise in many engineering applications such as DC-DC converters. Modeling of such converters is given using classical averaged or discrete models. However, a possible approach to analyze these circuits can be done using hybrid models. The behavior of a hybrid system is based on events' existence. Simulation which is a simple tool to analyze these systems, requires an algorithm that gives exact switched dates. Existing detection techniques, that are essentially based on approximated schemes, may lose some events and then diverge drastically from the real trajectory of the simulated hybrid system. Our aim within this thesis is to provide a fast and accurate simulation tool of 2nd order planar piecewise hybrid systems, which is based on analytical expressions of solutions. Our semi-analytic approach gives switching instants of state event and periodic temporal events. Our algorithm is implemented in a Scicos toolbox, another alternative in Matlab is also available
Danès, Patrick. "Interfaçage symbolique-numérique dans la simulation qualitative des systèmes dynamiques." Toulouse 3, 1995. http://www.theses.fr/1995TOU30072.
Full textEdibe, Bénédicte. "Modélisation et simulation de systèmes dynamiques par les bond graphs : application aux systèmes mécaniques polyarticulés." Rennes 1, 1995. http://www.theses.fr/1995REN1A007.
Full textThual, Olivier. "Transition vers la turbulence dans des systèmes dynamiques apparentés a la convection." Nice, 1986. http://www.theses.fr/1986NICE4000.
Full textBoussemart, Frédéric. "La simulation graphique interactive des systèmes dynamiques non linéaires : conception et réalisation en Scratchpad." Lille 1, 1992. http://www.theses.fr/1992LIL10037.
Full textBuratto, Florence. "Prescriptions de méthodes fonctionnelles et activité collective de conception : cas de la conception de processus dynamiques." Toulouse 3, 2000. http://www.theses.fr/2000TOU30213.
Full textBoukhecha, Mohammed. "Résolution instantanée des ambiguïtés de phase pour des systèmes hybrides GNSS modernes." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24143/24143.pdf.
Full textHadj, Amor Hassen Jawhar. "Contribution au prototypage virtuel de systèmes mécatroniques basé sur une architecture distribuée HLA. Expérimentation sous les environnements OpenModelica-OpenMASK." Toulon, 2008. http://tel.archives-ouvertes.fr/tel-00437932/fr/.
Full textMechatronics is the integration of different sciences and techniques of mechanical engineering, automation, electonics and informatics. The rapid evolution of the market competitors requires the reduction of development time of a product while increasing the quality and performance. It is therefore necessary to increase the effectiveness of the design process. To meet this need, in addition to the tools of analysis, simulation and especially virtual prototyping has become a key technology. It is difficult to find simulation tools capable of analyzing multi-dependent systems of different areas. However, an environment that allows a simulation integrating multidisciplinary mechatronic systems is necessary. This article describes a method of design and simulation of mechatronic systems. It identifies the first model of behaviour and the associated 3D geometric model. Then, the model of behaviour is seen as a dynamic hybrid system of two coupled hybrid automata (Operative part, Control part). We then present simulators OpenMASK, Openmodelica, the IEEE1516 standard HLA and work related to the architecture of distributed simulation. In a top-down, then we present our approach and testing to integrate the features of HLA in these simulators, to distribute the high level modelling elements of mechatronic systems and finally to complement Modelica with the formalism of hybrid automata which is essential in this work. We offer extensions to integrate real-time for interactive simulations. Finally we apply this approach on simulators cited using the HLA CERTI bus in a Linux environment through a representative example of a mechatronic system
Ricaud, Fabienne. "Etude de l'identification des sources acoustiques à partir du couplage de la pression en champ proche et de l'organisation instantanée de la zone de mélange de jet." Poitiers, 2003. http://www.theses.fr/2003POIT2274.
Full textBeauchaints, Felix. "Contribution à la simulation des robots manipulateurs : méthodologies de modélisation et d'identification des paramètres dynamiques." Montpellier 2, 1992. http://www.theses.fr/1992MON20056.
Full textTaralova-Roux, Ina. "Etude de la transmission MICDIF à caractéristique non différentiable à l'aide de la théorie des systèmes dynamiques non linéaires." Toulouse, INSA, 1996. http://www.theses.fr/1996ISAT0031.
Full textBraunschweig, Bertrand. "Aides à l'interprétation de simulations dynamiques : Application aux modèles de cinétique chimique." Paris 9, 1998. https://portail.bu.dauphine.fr/fileviewer/index.php?doc=1998PA090018.
Full textNumerous scientific and technical domains make constant use of dynamical simulations. Such simulators are put in the hands of a growing number of users. This phenomenon is due both to the extraordinary increase in computing performance, and to better graphical user interfaces which make simulation models easy to operate. But simulators are still computer programs which produce series of numbers from other series of numbers, even if they are displayed graphically. This thesis presents new interaction paradigms between a dynamical simulator and its user. The simulator produces a self-made interpretation of its results, thanks to a dedicated representation of its domain with objects. It shows dominant cyclic mechanisms identified by their instantaneous loop gain estimates, it uses a notion of episodes for splitting the simulation into homogeneous time intervals, and completes this by animations which rely on the graphical structure of the System. These new approaches are demonstrated with examples from Chemical kinetics, because of the generic and exemplary characteristics of the encountered behaviors. They are implemented in the Spike software, a Software Platform for Interactive Chemical Kinetics Experiments. Similar concepts are also shown in two other domains: interpretation of seismic wave propagation, and simulation of large projects. Altogether the thesis is a step towards the delivery of a "Systems dynamics intelligence"
Farcot, Etienne. "Etude d'une classe d'équations différentielles affines par morceaux modélisant des réseaux de régulation biologique." Phd thesis, Grenoble INPG, 2005. http://tel.archives-ouvertes.fr/tel-00010463.
Full textWang, Haoping. "Observation et commande par systèmes à fonctionnement par morceaux : application aux asservissements visuels." Thesis, Lille 1, 2008. http://www.theses.fr/2008LIL10063/document.
Full textThis research work deals with the study and the development of the linearization, state estimation and complex systems' control. Chapter 1 is devoted to the concept and classification of hybrid systems and to the origin and nature of the piecewise functioning systems (PFS). Thus, based on the PFS, chapter 2 proposes controllers for trajectories tracking and linearization of the real time plans. Chapters 3 and 4 aim at realizing the trajectory tracking or stabilization control in the case where the available feedback cornes from a digital sensor delivering the plant's output in a delayed and sampled format. ln chapter 3 a piecewise continuous observer which is essentially based on PFS theory and on dis crete Luenberger observer is developed. ln chapter 4, a stabilization control of a 2D or 3D inverted pendulum by using two feedbacks is proposed. At each sensor's sampling period, the control acts in the pendulum's balancing plan, which makes it possible to transform the 3D problem into a 2D one. Compared to other methods, the referred methods guarantee the stability without being based on a linearized model. ln this thesis, all proposed methods are illustrated with examples of simulation and real-time implementations
Sghaier, Adel. "Une méthode pour le prototypage virtuel de machines industrielles." Toulon, 2005. http://www.theses.fr/2005TOUL0012.
Full textIn our thesis we propose a method for modelling industrial machines in virtual environment. In Tact; the structure of an industrial machine model is composed by "Virtual Components" which corresponds to the physical industrial components of the machine and a control pan which corresponds to the functional specification of the machine. In our approach, each virtual component is modelled by VRML model for geometry and by hybrid automata (HA) for behaviour. The control part is modelled by Sequential Function Charts (SFC), as it is the case in the majority of industrial machines. Those SFC are translated to HA and composed with the virtual components IIA. The whole HA model of the machine is then implemented in the generic virtual environment "OpenMASK" by specific translation method which was developed previously. This approach makes virtual prototyping accessible by the specialists in the domain of industrial machine design domain, "["he method developed in our works is independent from the virtual reality platform. The modelling method developed in this thesis is implemented through two examples in order to validate our approach
Pontes, Duff Pereira Igor. "Approximation des systèmes dynamiques à grande dimension et à dimension infinie." Thesis, Toulouse, ISAE, 2017. http://www.theses.fr/2017ESAE0001/document.
Full textIn the engineering area (e.g. aerospace, automotive, biology, circuits), dynamical systems are the basic framework used for modeling, controlling and analyzing a large variety of systems and phenomena. Due to the increasing use of dedicated computer-based modeling design software, numerical simulation turns to be more and more used to simulate a complex system or phenomenon and shorten both development time and cost. However, the need of an enhanced model accuracy inevitably leads to an increasing number of variables and resources to manage at the price of a high numerical cost. This counterpart is the justification for model reduction. For linear time-invariant systems, several model reduction approaches have been effectively developed since the 60’s. Among these, interpolation-based methods stand out due to their flexibility and low computational cost, making them a predestined candidate in the reduction of truly large-scale systems. Recent advances demonstrate ways to find reduction parameters that locally minimize the H2 norm of the mismatch error. In general, a reduced-order approximation is considered to be a finite dimensional model. This representation is quite general and a wide range of linear dynamical systems can be converted in this form, at least in principle. However, in some cases, it may be more relevant to find reduced-order models having some more complex structures. As an example, some transport phenomena systems have their Hankel singular values which decay very slowly and are not easily approximated by a finite dimensional model. In addition, for some applications, it is valuable to have a structured reduced-order model which reproduces the physical behaviors. That is why, in this thesis, reduced-order models having delay structures have been more specifically considered. This work has focused, on the one hand, in developing new model reduction techniques for reduced order models having delay structures, and, on the other hand, in finding new applications of model approximation. The major contribution of this thesis covers approximation topics and includes several contributions to the area of model reduction. A special attention was given to the H2 optimal model approximation problem for delayed structured models. For this purpose, some new theoretical and methodological results were derived and successfully applied to both academic and industrial benchmarks. In addition, the last part of this manuscript is dedicated to the analysis of time-delayed systems stability using interpolatory methods. Some theoretical statements as well as an heuristic are developed enabling to estimate in a fast and accurate way the stability charts of those systems
Perez, Castaneda Gabriel Antonio. "Évaluation par simulation de la sûreté de fonctionnement de systèmes en contexte dynamique hybride." Thesis, Vandoeuvre-les-Nancy, INPL, 2009. http://www.theses.fr/2009INPL016N/document.
Full textThe research of analytical solutions for reliability assessment in dynamic context is not solved in the general case. A state of the art presented in chapter 1 shows that partial approaches exist in the case of particular hypothesis. The Monte Carlo simulation would be the only recourse, but there were no tools allowing the simultaneous simulation of the discrete evolution of the system and its continuous evolution taking into account the probabilistic aspects. In this context, in chapter 2, we introduce the concept of hybrid stochastic automaton capable of taking into account all the problems posed by dynamic reliability and to accede to the assessment of dependability parameters by a Monte Carlo simulation implemented in Scicos-Scilab environment. In chapter 3, we show the effectiveness of our approach of simulation for dependability assessment in dynamic context through two test cases of which case one is a benchmark of dependability community. Our approach responds to the posed problems, notably the consideration of the influence of the discrete state, of the continuous state and their interaction, in the probabilistic assessment of the performances of a system in which besides, the reliability characteristics of components depend themselves of the continuous and discrete states. In chapter 4, we give an idea of the interest of control by supervision as a means of dependability. The concepts of observer automaton and of controller have been introduced and illustrated on our test case in order to show their potential
Khouadjia, Mostepha Redouane. "Solving dynamic vehicle routing problems : from single-solution based metaheuristics to parallel population based metaheuristics." Thesis, Lille 1, 2011. http://www.theses.fr/2011LIL10140/document.
Full textMany problems in the real world have dynamic nature and can be modeled as dynamic combinatorial optimization problems. However, research on dynamic optimization focuses on continuous optimization problems, and rarely targets combinatorial problems. One of the applications in dynamic combinatorial problems that has received a growing interest during the last decades is the on-line or dynamic transportation systems. A typical problem of this domain is the Dynamic Vehicle Routing Problems (DVRPs). In this latter, the dynamism can be attributed to several factors (weather condition, new customer order, cancellation of old demand, vehicle broken down, etc.). In such application, information on the problem is not completely known a priori, but instead is revealed to the decision maker progressively with time. Consequently, solutions for different instances have to be found as time proceeds, concurrently with managing the incoming information. Such problems call for a methodology to track their optimal solutions through time. In this thesis, dynamic vehicle routing problem is addressed and developing general methodologies called metaheuristics to tackle this problem is investigated. Their ability to adapt to the changing environment and their robustness are discussed. Results of experiments demonstrate thanks to dynamic performance measures that our methods are effective on this problem and hence have a great potential for other dynamic combinatorial problems
Lenoir, Julien. "Modèle déformable 1D pour la simulation physique temps réel." Lille 1, 2004. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2004/50376-2004-187-188.pdf.
Full textCertaines applications, comme la suture d'organe, mettent en jeu plusieurs modèles dynamiques liés ensemble. Pour ce type de simulation, nous proposons une architecture logicielle permettant de simuler des articulations d'objets quelconques (rigides ou déformables) quel que soit le formalisme physique employé pour chacun d'eux. Cette proposition logicielle trouve diverses applications notamment en simulation chirurgicale mais permet aussi de simuler dynamiquement toute articulation d'objets hétérogènes. Certaines manipulations requièrent une souplesse du modèle à des endroits précis, sachant que ces zones peuvent se déplacer lors d'une simulation, par exemple pendant le serrage d'un noeud. Pour cela, nous proposons une multirésolution géométrique et mécanique sur notre modèle qui vise à adapter localement sa résolution afin qu'il puisse s'adapter aux interactions tout en offrant des bonnes performances générales en calcul. On concentre alors le plus gros du temps de calcul sur les zones d'intérêt et on limite ce temps dans les autres zones du modèle. Un critère d'adaptation de la résolution en fonction de la courbure est proposé. Cette technique est particulièrement adaptée à la simulation de noeuds en permettant à la spline d'augmenter le nombre de degrés de liberté et ainsi en lui fournissant une grande souplesse de définition géométrique dans la zone de serrage
Boussier, Jean-Marie. "Modélisation de comportements dans les systèmes dynamiques : Application à l'organisation et à la régulation de stationnement et de déplacement dans les Systèmes de Trafic Urbain." Phd thesis, Université de La Rochelle, 2007. http://tel.archives-ouvertes.fr/tel-00411272.
Full textDémare, Thibaut. "Une approche systémique à base d'agents et de graphes dynamiques pour modéliser l'interface logistique port-métropole." Thesis, Le Havre, 2016. http://www.theses.fr/2016LEHA0021/document.
Full textA logistic system is an essential component of a spatial system. Actors are organised around infrastructures in order to move different kinds of flow (of goods, of information, or financial) over a territory. The logistic organisation comes from an auto-organised and distributed process from the actors. This works aims to understand, at different scales, how autonomous and heterogeneous actors (according to their goals and methods to take decisions) are collectively organised around infrastructures to manage different kinds of flow, and despite numerous constraints (temporal, spatial,...). We propose an agent-based model which allows to simulate the processes to create and organise logistic flow over a territory. The model describes an interface between international and urban flow in order to understand how the port and urban dynamics work together. The model integrates a structural and organisational dynamics thanks to dynamic graphs in order to represent the evolution of this kind of system. Thus, the agents can adapt themselves to system's perturbations as in the reality
Sainsaulieu, Lionel. "Modélisation, analyse mathématique et numérique d'écoulements diphasiques constitués d'un brouillard de gouttes." Palaiseau, Ecole polytechnique, 1991. http://www.theses.fr/1991EPXX0012.
Full textEulerian modelization of sprays leads to convection-diffusion systems written under non conservatrice form. We show how the averaging of the Navier-Stokes equations satsified by the gas flow around the droplets and the liquid flow inside the droplets leads to a well-posed problem. The shock waves solutions of the first order non-conservative system extracted from this model are defined as the limit when the diffusion processes are neglected of solutions of the second order system. Then we solve the Riemann problem. More generally this method allows us to define shock waves solutions for a wide class of hyperbolic systems written under non-conservative form. Finally the last section deals with the numerical simulation of sprays
Carmouze, Quentin. "Modélisation et simulation numérique des écoulements diphasiques compressibles denses et dilués." Thesis, Université Côte d'Azur (ComUE), 2019. http://www.theses.fr/2019AZUR4094.
Full textThis thesis presents some contributions to the theoretical modelling and numerical simulation of compressible dense and dilute two-phase flows. A new two-phase flow model is built, weakly hyperbolic and thermodynamically consistent. The novelty come from a modification of the volume fraction equation. It implies major consequences on the acoustic waves’ propagation, compared to the Baer & Nunziato (1986) model, which seems more physical compared to the flow topology. Numerical resolution of the new model is addressed through a new Riemann solver with internal reconstruction (RSIR) is built, based on the Linde (2002) method. First, this method is reconsidered and improved in the frame of the Euler equations. Then this method is extended to the new compressible dense and dilute two-phase flows model. This model poses serious difficulties as it is weakly hyperbolic and only valid in the limit of stiff pressure relaxation, implying non self-similar solutions. Thanks to the internal reconstruction approach, a low dissipative Riemann solver is built for the new model. The RSIR method is used to solve solid particles jet instabilities, showing possible explanation of their creation process. Then a study on the multidimensional flow around some discrete particles is done. A Level-Set type method is developed to describe the translation of a rigid body on an unstructured mesh. Thanks to the Overbee limiter developed by Chiapolino et al., (2017) a simple and robust solid/fluid coupling method is built. This method is then extended to 2D and validated through comparisons in the frame of a supersonic flow around a static blunt body. Two-way coupling is then addressed to observe motion of particles induced by shock and creation of clusters
Batt, Grégory. "Validation de modèles qualitatifs de réseaux de régulation génique : une méthode basée sur des techniques de vérification formelle." Phd thesis, Université Joseph Fourier (Grenoble), 2006. http://tel.archives-ouvertes.fr/tel-00012040.
Full textDans cette thèse, nous proposons une approche permettant de tester la validité de modèles de réseaux de régulation génique en comparant les prédictions obtenues avec les données expérimentales. Plus spécifiquement, nous considérons dans ce travail une classe de modèles qualitatifs définis en termes d'équations différentielles linéaires par morceaux (LPM). Ces modèles permettent de capturer les aspects essentiels des régulations géniques, tout en ayant une forme mathématique simple qui facilite leur analyse symbolique. Egalement, nous souhaitons utiliser les informations qualitatives sur la dynamique du système données par les changements du sens de variation des concentrations des protéines du réseau. Ces informations peuvent être obtenues expérimentalement à partir de profils d'expression temporels.
La méthode proposée doit satisfaire deux contraintes. Premièrement, elle doit permettre d'obtenir des prédictions bien adaptées à la comparaison avec le type de données considéré. Deuxièmement, étant donné la taille et la complexité des réseaux d'intérêt biologique, la méthode doit également permettre de vérifier efficacement la cohérence entre prédictions et observations.
Pour répondre à ces deux contraintes, nous étendons dans deux directions une approche précédemment développée par de Jong et collègues pour l'analyse symbolique des modèles LPM qualitatifs. Premièrement, nous proposons d'utiliser une représentation plus fine de l'état du système, permettant d'obtenir, par abstraction discrète, des prédictions mieux adaptées à la comparaison avec les données expérimentales. Deuxièmement, nous proposons de combiner cette méthode avec des techniques de model checking. Nous montrons que l'utilisation combinée d'abstraction discrète et de model checking permet de vérifier efficacement les propriétés dynamiques, exprimées en logique temporelle, des modèles continus.
Cette méthode a été implémentée dans une nouvelle version de l'outil Genetic Network Analyzer (GNA 6.0). GNA 6.0 a été utilisé pour la validation de deux modèles grands et complexes de l'initiation de la sporulation chez B. subtilis et de la réponse au stress nutritionnel chez E. coli. Nous avons ainsi pu vérifier que les prédictions obtenues étaient en accord avec la plupart des données expérimentales disponibles dans la littérature. Plusieurs incohérences ont également été identifiées, suggérant des révisions des modèles ou la réalisation d'expériences complémentaires. En dehors d'une contribution à une meilleure compréhension du fonctionnement de ces systèmes, ces deux études de cas illustrent plus généralement que, par la méthode proposée, il est possible de tester si des prédictions obtenues pour des modèles complexes sont cohérentes avec un large éventail de propriétés observables expérimentalement.
Bechara, Charly. "Study and design of a manycore architecture with multithreaded processors for dynamic embedded applications." Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00713536.
Full textAccorinti, Flavio. "Two-Phase Power Electronics Cooling Solution Design in Air Context Answering to the Objectives of the Hybrid Aircraft 2035 High-efficiency cooling system for highly integrated power electronics for hybrid propulsion aircraft Systèmes diphasiques pour le contrôle ther- mique de l’électronique de puissance Steady-state analysis of a capillary pumped loop for terrestrial application with methanol and ethanol as working fluids Experimental and Numerical Analysis of Start-Up of a Capillary Pumped Loop for Terrestrial Applications." Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2020. http://www.theses.fr/2020ESMA0005.
Full textTechnological innovation and reduction of the energy required for propulsion is necessary to reduce aircrafts environmental impact. The present work is part of the research project Clean Sky 2 – HASTECS, which purpose is the development of a hybrid propulsion aircraft. The high powers involved make classical cooling solutions obsolete, in terms of efficiency, and not suitable for the power to mass ratio required for the target 2035. In particular, the problem related to power electronics cooling is assessed in this work with the purpose to achieve a performance coefficient of 25 kW/kg.This work, essentially numerical, is linked to the research, design, optimisation and analysis of a high efficiency cooling system, able to control power electronics components temperature, operating in pretty severe conditions (high thermal power density, >15kW; cyclic variation of cold source temperature and severe transient phases) and which has to be lightweight to ensure performance coefficient requirements. Different cooling technologies, active single and two-phase and passive capillary driven, have been analysed and compared on the basis of literature data and of a first approximation design: the most adapted solution has been chosen on the base of its specific power [kW/kg]. The solution that has been finally retained is a Capillary Pumped Loop for Integrated Power (CPLIP), which thermal characteristics are quite interesting and unique. After its design, the loop has been optimised to answer to objectives of 2025 and 2035. It is worth of attention the work carried out in collaboration with power electronics team of the same project to achieve a mutual optimisation of the systems. Concerning the thermal side, the attention was focused on the condenser, the heaviest component in the loop. The 2025’s solution is characterised by a classical flat plate air-methanol condenser which allowed to cross over the threshold of 15kW/kg for 2025. 2035’s solution, on the contrary, is characterised by an innovative condenser typology, using microchannels on methanol side and louvered fins on air side, allowing to obtain more than double of the power coefficient required! In this work, thermal and hydraulic characteristics of the CPLIP have been experimentally analysed, using a prototype deriving from previous studies, and by using CFD and a 0D model. Results show the ability of the CPLIP to control the temperature of power electronics modules during a short and medium-range aircraft mission profile, characterised by sudden changes of thermal load and cyclic variations of the cold source temperature.Finally, a study focused on the transient behaviour of the loop has been carried out. In particular, the start-up of the CPLIP and its behaviour during sudden and violent acceleration stages, characterising this application filed, have been exploited. In the first case, an experimental and a numerical study were carried out to demonstrate the ability of the loop to starts its operation in the most difficult thermal and environmental conditions (high thermal load and high environmental temperature). In the second case, a numerical study has been performed to understand the behaviour of the loop when an acceleration field up to 10g perturbs its operations.This work opens new interesting perspectives stand points concerning the application itself and the necessity to adopt a multidisciplinary approach to simultaneously thermally and electronically design new generation power electronics
Homssi, Louay. "Outils de modélisation, identification et traitement du signal pour le diagnostic des défauts dans les systèmes continus." Toulouse, INSA, 1992. http://www.theses.fr/1992ISAT0017.
Full textTsamados, Michel. "Mechanical response of glassy materials : theory and simulation." Phd thesis, Université Claude Bernard - Lyon I, 2009. http://tel.archives-ouvertes.fr/tel-00466081.
Full textCissé, Fabien. "Hétérogénéités des fluides piétonniers : une matière active individuelle et collective." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066031/document.
Full textComplex bodies, as crowds of pedestrian can present Strong Velocity and Density fluctuations. The persons shaping theses bodies are their own Drive motors. They follow local microscopic motion rules which, under certains Density conditions, can play a major role on the whole dynamics at the macroscopic scale. Unlike the purely collective animals, as those composing schools of fish, flocks of birds or herds of wildebeest, the pedestrians share at the same time collective and individual intentions. From this particular nature appear singular self-organisation behaviors, depending on the cognitive aspect of the pedestrian interactions, the geometry of the space, the plurality of targets, as well as the density and the velocity. The goal of this thesis has been to reproduce via numerical simulation tools the principal observed phenomena using physical and behavioral hypothesis. For that, we have adopted a continuous microscopic approach. The dynamics for each pedestrian is done locally trough a Newton-like equation which takes in account their anticipation ability via the search of the different collision time and the use of an estimation function of the possible deviation angles. Then, we have compared the behaviour differences between our model and those that inspired it in differents Spatial geometries. We have also studied generic situations as the evacuation trough a door with different sets of parameters : the size of the door, the velocity and the injection of a noise in the equation of forces. Finally, we have reproduced the oscillation phenomena of passings of two groups around a door by introducing some priority rules
Abou, Rjeily Yves. "Management and sustainability of urban drainage systems within smart cities." Thesis, Lille 1, 2016. http://www.theses.fr/2016LIL10085/document.
Full textThis work presents the Real Time Control (RTC) of Urban Drainage Systems (UDS) within smart cities. RTC requires to understand the UDS operation and to perform simulations on measured, forecasted and synthetic events. Therefore, a Real Time Monitoring system (RTM) was implemented on the experimental site, and combined to a simulation model. A model auto-calibration process and hydraulic boundary conditions forecast system were developed, in order to simulate the hydrologic-hydraulic response. Aiming to protect the citizens and mitigate flooding consequences, the RTC was composed of a flooding forecast system followed by a dynamic management strategy. The proposed concept and methodologies were applied and evaluated on the Lille 1 University Campus, within the SunRise project. RTM was found very helpful in understanding the system operation and calibrating the simulation model. Genetic Algorithm followed by Pattern Search formed an effective auto-calibration procedure for the simulation model. NARX Neural Network was developed and validated for forecasting hydraulic boundary conditions. Once understanding the UDS operations, the RTC was developed. NARX Neural Network was found capable to forecast flooding events. A dynamic management for increasing a tank retention capacity, was studied based on calculating a Valve State Schedule, and results were satisfying by using Genetic Algorithm and a modified form of Artificial Bee Colony, as optimization methods. A qualitative management was also proposed and tested for verifying its potential in reducing flooding volumes
Assaad, Mohamad Ali. "An overview on systems of systems control : general discussions and application to multiple autonomous vehicles." Thesis, Compiègne, 2019. http://www.theses.fr/2019COMP2466/document.
Full textThis thesis focuses on System of Systems (SoS) control, and how to build adaptable and reliable SoS. This work is part of the Labex MS2T laboratory of excellence on technological SoS development. SoS are complex systems that consist of multiple independent systems that work together to achieve a common goal. SoS Engineering is an approach that focuses on how to build and design reliable SoS that can adapt to the dynamic environment in which they operate. Given the importance of controlling constituent systems (CS) in order to achieve SoS objectives, the first part of this thesis involved a literature study about the subject of SoS control. Some control methods exist for large-scale systems and multi-agent systems, namely, hierarchical, distributed, and decentralized control might be useful and are used to control SoS. These methods are not suitable for controlling SoS in its whole, because of the independence of their CS; whereas, multi-views frameworks are more suitable for this objective. A general framework approach is proposed to model and manage the interactions between CS in a SoS. The second part of our work consisted of contributing to Intelligent Transportation Systems. For this purpose, we have proposed the Cooperative Maneuvers Manager for Autonomous Vehicles (CMMAV), a framework that guides the development of cooperative applications in autonomous vehicles. To validate the CMMAV, we have developed the Cooperative Lateral Maneuvers Manager (CLMM), an application on the autonomous vehicles that enables equipped vehicles to exchange requests in order to cooperate during overtaking maneuvers on highways. It was validated by formal scenarios, computer simulations, and tested on the autonomous vehicles of the Equipex Robotex in Heudiasyc laboratory
Peng, Shuiran. "Analyse mathématique et numérique de plusieurs problèmes non linéaires." Thesis, Poitiers, 2018. http://www.theses.fr/2018POIT2306/document.
Full textThis thesis is devoted to the theoretical and numerical study of several nonlinear partial differential equations, which occur in the mathematical modeling of phase separation and micro-electromechanical system (MEMS). In the first part, we study higher-order phase separation models for which we obtain well-posedness and dissipativity results, together with the existence of global attractors and, in certain cases, numerical simulations. More precisely, we consider in this first part higher-order Allen-Cahn and Cahn-Hilliard equations with a regular potential and higher-order Allen-Cahn equation with a logarithmic potential. Moreover, we study higher-order anisotropic models and higher-order generalized Cahn-Hilliard equations, which have applications in biology, image processing, etc. We also consider the hyperbolic relaxation of higher-order anisotropic Cahn-Hilliard equations. In the second part, we develop semi-implicit and implicit semi-discrete, as well as fully discrete, schemes for solving the nonlinear partial differential equation, which describes both the elastic and electrostatic effects in an idealized MEMS capacitor. We analyze theoretically the stability of these schemes and the convergence under certain assumptions. Furthermore, several numerical simulations illustrate and support the theoretical results