Дисертації з теми "Modélisation des systemes physique"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-50 дисертацій для дослідження на тему "Modélisation des systemes physique".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
Chambet, Nicolas. "Modélisation physique des réseaux de neurones : étude de comportements collectifs : application au traitement de l'information." Angers, 1995. http://www.theses.fr/1995ANGE0014.
Bruyère, Vincent. "Une modélisation multi-physique et multi-phasique du contact lubrifié." Electronic Thesis or Diss., Lyon, INSA, 2012. http://www.theses.fr/2012ISAL0110.
Classically, many assumptions are used to model the fluid behaviour in a lubricated contact : continuous film, constant viscosity across the film thickness, film thickness is very thin compared to other contact dimensions, Newtonian lubricant... However, some of them are not well-founded for the study of Elasto-HydroDynamic contacts with high sliding or to estimate the liquid distribution at the exit of the contact. An original numerical approach, based on the general fluid mechanics equations and taking into account the fluid/solid coupling and thermal effects, is developed here in order to give more physical insights to the usual modelling. First of all, the thermal effects are shown on the friction coefficient evolution for Thermo- EHD contacts. A minimum value is found concerning the friction value for the pure sliding case. It is explained by analyzing the heat transfer between the solids and the lubricant. The origin of the resulting local modifications of the film thickness and the existence of a film thickness for zero entrainment velocity cases are related to the presence of a high viscosity gradient through the film. A qualitative comparison is performed with experimental data from literature, validating the results. Second, the free surface flow of the lubricant around the contact is experimentally and numerically studied with a diffuse interface method. The capillary effects on the air/lubricant meniscus position are analyzed and quantitatively compared with experimental data from literature. Good agreements are found. An analytical approach is then developed, based on the numerical study of the two-phase flow. An analytical law predicting the liquid distribution is obtained. The exit area of EHD contacts is then investigated with a vaporous cavitation model highlighting the necessity of taking into account the effects of surrounding air and surface wettabillity. Finally, a first approach of the tri-dimensional two-phase flow is performed, showing the capillary effects on the interface location
Bruyère, Vincent. "Une modélisation multi-physique et multi-phasique du contact lubrifié." Phd thesis, INSA de Lyon, 2012. http://tel.archives-ouvertes.fr/tel-00782322.
Verbavatz, Vincent. "Modélisation des systèmes urbains." Thesis, université Paris-Saclay, 2022. http://www.theses.fr/2022UPASP066.
Cities surprise and interest a large and long-standing scientific community of economists, sociologists, geographers and historians, in which physicists and mathematicians also have their word. Cities are surprising because they exist, which is anything but obvious and reflects the essential fact that individuals are prone to group together. Cities are interesting because they are developing to the point where they have become the primary context of human life on Earth, and understanding them properly has become a global issue. Finally, it is critical to note that cities are similar across civilizations despite the multiplicity of individualities that underlie them.The urban phenomenon and the empirical similarities between the cities of the world invite us to look for common causes: this is the grounding reason for a science of cities in which we place ourselves. Our quantitative work is unique in its methodology, which stems from statistical physics, but threefold in its objectives.We focus on urban demography, the main variable of urban systems, of which we study both the static distribution and the dynamic evolution, proposing a new law of urban growth.We also study the social dynamics of cities, which characterize the economic interactions between individuals and the dynamics of segregation and gentrification. Finally, we aim at describing urban transportation, the networks on which cities rely, and quantify the non-trivial environmental and economic consequences of the interplay between private and public transport
Olguín, Díaz Ernesto. "Modélisation et commande d'un système véhicule/manipulateur sous-marin." Grenoble INPG, 1999. http://www.theses.fr/1999INPG0012.
Vernay, Benoît. "Modélisation et simulation haut-niveau de micro-systèmes électromécaniques pour le prototypage virtuel multi-physique en SystemC-AMS." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066171/document.
Embedded systems have evolved to more complex assemblies, called Cyber-Physical Systems (CPS), mostly operating through networks and tightly interacting with the environment.As actuators or sensors, micro-electromechanical systems (MEMS) are essential elements in these systems where they are integrated along with control and signal processing units.Designing such solutions requires a multi-domain approach like virtual prototyping.Based on system-level models, this technique allows to anticipate the global behavior in early-design phases and to further refine it in more advanced steps.Integrated circuits were progressively designed with respect to this method, especially through Hardware Description Languages (HDLs) like VHDL or Verilog.By adopting a higher-abstraction degree, SystemC enabled the co-development of hardware/software specific applications.In parallel, the Analog and Mixed-Signal (AMS) extensions proposed in SystemC-AMS partly addressed the increasing amount of analog components and are considered as a promising alternative for the virtual prototyping of heterogeneous systems.To that end, this thesis addresses the system-level modeling and simulation of MEMS devices in SystemC-AMS.First, we evaluate the current capabilities of the standard and supported models of computation in SystemC-AMS.We demonstrate the limitations and the the difficulty to elaborate equivalent models of MEMS devices whose geometry and internal coupling require more detailed descriptions.Second, we propose to directly integrate MEMS reduced models in SystemC-AMS.Model-order reduction is a mathematical technique to decrease the number of degrees of freedom and generate compact models from large-scale systems.We thus integrate the reduced models exported from the finite-element analysis tool \emph{MEMS+} and propose an Application Programmable Interface (API) to insert these \textit{ad hoc} models in SystemC-AMS.After reviewing the main API features, we discuss some improvements of both the standard and the presented solution.Finally, we verify our solution through the use case of an accelerometer and compare the results with the state of the art in terms of modeling accuracy and simulation performance.This thesis introduces a framework to integrate MEMS devices with the surrounding electronics in a unified system-level simulation environment
Ben, messaoud Yethreb. "Modélisation analytique du couplage multi-physique magnétique-thermique dans la phase de préconception d'un système mécatronique." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLC079/document.
During the design phase, the different engineering teams make multiple FE simulations dealing with various physical behaviours in order to ensure both verification and validation.However, the unsatisfactory results lead to late changes and hence to long iterations and increasing costs.In order to tackle this problem, it is essential to take into account the geometrical and multi-physical constraints in the complex system architecture since the conceptual design phase.In fact, a process called SAMOS is developed aiming at selecting the most adequate 3D multi-physical architecture while ensuring an efficient collaboration between the engineering teams. Moreover, this framework is based on two SysML extensions which allow the enrichment of the architecture with geometrical and multi-physical data.Furthermore, this thesis focuses on magnetic constraints and magnetic-thermal coupling.Since this phase does not support long FE simulations, the analytical models based on simplified geometries are sufficient to provide satisfactory approximate results.In this context, different analytical models are studied and validated through FE simulations and measures for several cases such as NdFeB permanent magnets. Indeed, the temperature rise does not only decrease the remanent flux density but is able also to cause irreversible losses. In fact, once we go back to the initial temperature, the characteristics of the magnet are modified. The different factors impacting the demagnetization process are discussed.Besides, the temperature impact on brushless motors’ performances is studied since this device represents a complex mechatronic system
Vernay, Benoît. "Modélisation et simulation haut-niveau de micro-systèmes électromécaniques pour le prototypage virtuel multi-physique en SystemC-AMS." Electronic Thesis or Diss., Paris 6, 2016. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2016PA066171.pdf.
Embedded systems have evolved to more complex assemblies, called Cyber-Physical Systems (CPS), mostly operating through networks and tightly interacting with the environment.As actuators or sensors, micro-electromechanical systems (MEMS) are essential elements in these systems where they are integrated along with control and signal processing units.Designing such solutions requires a multi-domain approach like virtual prototyping.Based on system-level models, this technique allows to anticipate the global behavior in early-design phases and to further refine it in more advanced steps.Integrated circuits were progressively designed with respect to this method, especially through Hardware Description Languages (HDLs) like VHDL or Verilog.By adopting a higher-abstraction degree, SystemC enabled the co-development of hardware/software specific applications.In parallel, the Analog and Mixed-Signal (AMS) extensions proposed in SystemC-AMS partly addressed the increasing amount of analog components and are considered as a promising alternative for the virtual prototyping of heterogeneous systems.To that end, this thesis addresses the system-level modeling and simulation of MEMS devices in SystemC-AMS.First, we evaluate the current capabilities of the standard and supported models of computation in SystemC-AMS.We demonstrate the limitations and the the difficulty to elaborate equivalent models of MEMS devices whose geometry and internal coupling require more detailed descriptions.Second, we propose to directly integrate MEMS reduced models in SystemC-AMS.Model-order reduction is a mathematical technique to decrease the number of degrees of freedom and generate compact models from large-scale systems.We thus integrate the reduced models exported from the finite-element analysis tool \emph{MEMS+} and propose an Application Programmable Interface (API) to insert these \textit{ad hoc} models in SystemC-AMS.After reviewing the main API features, we discuss some improvements of both the standard and the presented solution.Finally, we verify our solution through the use case of an accelerometer and compare the results with the state of the art in terms of modeling accuracy and simulation performance.This thesis introduces a framework to integrate MEMS devices with the surrounding electronics in a unified system-level simulation environment
Lebrun, Tristan. "Modélisation multi-physique passive, identification, simulation, correction et asservissement de haut-parleur sur des comportements cibles." Electronic Thesis or Diss., Sorbonne université, 2019. http://www.theses.fr/2019SORUS686.
This thesis concerns electrodynamic loudspeaker modeling, simulation and control. Regarding modeling, we adopt a component-based approach that relies on port-Hamiltonian systems. Several linear and nonlinear phenomena are thus modeled and then aggregated in a multi-physical framework. Particular attention is paid to the impact of thermal effects on electrical and mechanical components, for which we introduce new irreversible conservative models. The simulations regenerate known complex behaviors. A first open-loop control is developed to eliminate distortions by differential flatness. In order to provide the controller with the model's nonlinearity parameters, an ad hoc estimation method is proposed. This combines a separation of the measurement into sub-signals (organized in a homogeneous order of non-linearity) and the optimization of a cost function (improving the contrast between orders). After numerical validation, estimation and control methods are applied on a test bench. The estimated physical parameters are consistent but the re-simulated time signals indicate the need of improvement of the model at very low frequency and to use higher homogeneous orders. The real-time corrector leads to a measurable reduction of the distortions on the sound pressure. In addition, another open-loop control is developed to compensate for the Doppler effect due to the movement of the membrane. Finally, methods on closed-loop control are proposed. One targets acoustic absorption by combining "control law in finite time" (for efficiency) and "passivity" (for robustness). The other, more general, develops an "half-physical, half-digital" method of connection between a physical system and a digital controller that makes the passivity insensitive to the delay introduced by the digital signal processor
Haj, kacem Mohamed Amine. "Contribution au développement d'une méthodologie de diagnostic des systèmes Cyber-Physique." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAT119.
Industrial systems cover many forms. Today, they are most often organized in networks. The new information and communication technologies provide a set of additional means to realize applications of major interest to strengthen the safe operation of these systems and the safety of people.Among these industrial systems, we can cite cyber-physical systems (CPS) characterized by a large number of variables, nonlinearities and uncertainties. Their decomposition into subsystems, making them more manageable and hierarchically organized, is fundamental. Each of the subsystems consists of different interconnected replaceable components that perform different functions.With this in mind, we propose a diagnostic approach based on four types of knowledge: functional, structural, topological and behavioral.This approach, which includes detection and localization, exploits the representation of different knowledge to detect and isolate the source of failure. In order to eliminate any ambiguity of location, the addition of a timed automat allows, thanks to a temporal analysis, to efficiently identify the defective component(s). The proposed multimodel approach is organized around three algorithms.Modeling and failure analysis is illustrated on a cyber-physical system: the "RobAIR" telepresence robot. The different knowledge models were established with an analysis approach as well as the construction of the diagnostician based on previously defined signaturesThe implementation of Matlab's Simulink / Stateflow isolation and detection algorithms made it possible to build the diagnoser according to the proposed methodology and thus validate our approach by simulating the operation with random injection of various failures.The proposed analysis method was applied to the RobaIR robot's start-up tests with particular attention to the displacement part. The testing of all the robot's functionalities is done by programming the Arduino board. For this application, the detection and isolation algorithms have been supplemented by obstacle detection and failure mode identification
Caillard, Pierre. "Conception par optimisation d'une chaine de traction électrique et de son contrôle par modélisation multi-physique." Thesis, Ecole centrale de Lille, 2015. http://www.theses.fr/2015ECLI0025/document.
The works of this thesis concern the optimal design methodology of an electric vehicl powertrain, in early development phase. The first part of this report introduces th environmental context of transportation in order to assess the problem of system design o an electric powertrain which includes a transmission, an induction machine, an inverter an a battery. The selected study case is a Renault Twizy. The second part deals with modelin choices and details the analytic models of the components. Then these models are pu together to get an estimate of the vehicle range, by calculating the components’ losses an the powertrain cost. The third part is devoted to methods and optimization strategies wit the objective to use the systemic model with driving cycles, electric machine control and th physics of each component, without increasing too much computing times. The final par presents results from optimal designs, by comparing several variables or objectives sets Results show how significant the systemic design is. Experiments on a test bench allow validating the hypothesis that have been made
Klein, Sarah. "Application des outils de la physique statistique au transport intracellulaire." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS090/document.
Most processes in our daily life are far from equilibrium. The prime example is a cell and the transport occurring within. In this thesis intracellular transport is modeled by means of stochastic processes. For this, two different approaches are applied: the explicit mod- eling of active particles with internal degrees of freedom with characteristics as they were determined experimentally. And secondly, the collective effects occurring in many particle systems are studied in a phenomenological way by means of exclusion processes.In the explicit model one important result is given by the fact that force fluctuations are essential to capture the relevant motion characteristics. Further, the influence of the cellular environment creates counter-intuitive effects, like a possible inversion of the bias. The motion characteristics can be represented in a coarse-grained manner as an exclusion process for particles with internal states. Due to the resulting disorder in the hopping rates a density-dependent condensation occurs.In a second part, a two-lane exclusion model is studied. Two species in a tubular geometry inspired by filamentous fungi are considered.This can be seen as a minimal model exhibiting a phase transition from a low density phase to an intriguing phase with periodically changing particle densities
Neuvéglise, Sixtine. "Modélisation numérique et physique de la chaîne de récupération de l'énergie de la houle par un dispositif bord à quai." Thesis, Normandie, 2018. http://www.theses.fr/2018NORMLH34/document.
The study of a quayside wave energy converter is proposed. A simplified model composed ofa rectangular buoy oscillating in heave motion and installed close to a vertical dike is developedusing three different models. An analytical model based on potential flow theory is developed inintermediate water depth. A numerical model resolving the Navier-Stokes equation is developed.Experimental tests are performed for different floater dimensions and are used as references for the two other models. The comparison between the three models presents the validity domain of the analytical model. The existence of non-linear effects acting on the floater behaviour is shown.At first, the impact of the system dimensions on the floater behaviour are highlighted and quantified. According to these results a correction of the analytical model is proposed. Moreover, the corrected analytical model is applied to the wave energy converter behaviour. Secondly, the overtoppings are expressed using the wave height between the dike and the floater (provided by analytical model) and the Van Der Meer formula (2002). These overtoppings are also estimated using experimental tests. The comparison of these two models shows the presence of strong load losses when the floater is close to the dike. In those cases the analytical model needs a correction taking into account these load losses. It is also shown that when at the same time the wave length is high and the toe clearance between the dike and the floater is small, the dike overtopping are reduced by the presence of the floater
Wang, Ruomin. "Modélisation à haut niveau d'abstraction de l'intégrité du signal dans les bus de communication." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066196/document.
As a result of continuing growth of electronic technology, signal integrity analysis has now become a more and more critical challenge in the electronic systems design process. To address this issue, designers have introduced several approaches. However, due to the higher heterogeneity of modern applications, along with time-to-market constraints, a new modeling methodology is required to provide the system?s signal integrity performance at a high-level of abstraction. Moreover, it should be easily interoperable with the system?s functional model. The aim of this work is to propose a new modeling methodology for signal integrity analysis that can meet these requirements. Our method is based on the combination of two kinds of blocks, named functional blocks and non-functional blocks. They are built in C/C++ or SystemC/SystemC-AMS, in order to be easily simulated in a single environment. The functional block is used to model the ideal behavior of the system. The non-functional block is used to represent the highly nonlinear and non-ideal behaviors, caused by signal integrity issues. In the non-functional block, neural networks are used to model these non-ideal behaviors. To validate our method, we developed two applications based on I2C and USB 3.0 applications. Our method greatly increases simulation speed (99% faster than a SPICE model), while achieving a relative absolute error around 3%. Finally, our method is a flexible and modular approach since models can easily be parameterized and interoperable. In the future, this original method for high-level modeling of signal integrity could be integrated in the forthcoming design flows of cyber-physical systems
Sène, Abdou. "Modélisation asymptotique de plaques : contrôlabilité exacte frontière, piézoélectricité." Phd thesis, Université Joseph Fourier (Grenoble), 1999. http://tel.archives-ouvertes.fr/tel-00004849.
Rus, Mariana. "Grandeurs cinématiques et mesures locales et de champs dans l'intéraction homme - structure." Phd thesis, INSA de Rouen, 2010. http://tel.archives-ouvertes.fr/tel-00560877.
Jullian, Gauthier. "Diagnostic robuste de pile à combustible PEM par modélisation physique et mesures d’impédance : prise en compte de conditions dynamiques et du vieillissement." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAT009/document.
The PEMFC fuel cell is an electrochemical generator that has interesting potential for automotive applications and which use could help to meet pollution challenges. Poor management of system auxiliaries or malfunctions can place the fuel cell under operating conditions that accelerate degradation processes and shorten its useful life. The- operating conditions of the fuel cell core (temperature, humidity and partial pressures) must be monitored to identify as soon as possible and without any error abnormal situations, which is particularly difficult in dynamic operating conditions and during ageing.The aim of this thesis is to provide solutions to this problem. To that end, a robust diagnostic approach of operating conditions without direct measurement, in a dynamic environment and taking ageing into account has been developed.In order to characterize the fuel cell, a campaign of experimental tests on a test bench was carried out during 1000 hours of operation, with and without faults. This test campaign also allowed to verify to what extent the easily accessible polarization curves and impedance spectroscopy depend on the internal operating conditions.The approach developed is based on one hand on the use of a physical fuel cell model that capture its behaviour for given operating conditions and on the other hand on easy-access current, voltage and impedance measurements. Thus, this allows the development of an embedded solution that minimizes the number of sensors required.The differences between the experimental measurements and the outputs computed by the physical fuel cell model – called residuals – are indicators which are sensitive to faults in operating conditions, and insensitive to usual operating dynamic conditions. Two residuals, generated from fuel cell output voltage and high frequency impedance, are used to detect abnormal operating conditions thanks to threshold detection. The choice of the detection threshold levels allows to set the detection performance in terms of good detection and false alarm probabilities.In order to take ageing into account, a degradation module computes the decrease of fuel cell voltage with time so that ageing is taken explicitly into account by residuals.Going beyond detection alone, a method to class the operating conditions faults has also been proposed. It uses a database of residuals from various known faults to train a K-nearest-neighbour classifier, so that faults can be identified and classified.The model developed in the CEA was compared with experiments carried out on the test bench. An experimental determination of the model constants was carried out using electrochemical methods (cyclic voltammetry...) and numerical ones (linear regression). It appears that the model correctly computes voltage and high-frequency impedance, confirming the possible use of this specific model for diagnostic purpose. The method has been tested with optimal thresholds that have been empirically determined. The detection score obtained is 80%. The false alarm rate is less than 5% during the test.The K-NN classifier was then validated on experimental data. The classification score during the 1000h test is around 60% with large disparities depending on the faults. This score is more than 99% for two of the studied faults (high pressures and low humidity), 63% for low pressures but only 20% for a temperature drop or humidity increase.This work concluded that the approach using a physical model diagnosed most faults with a low level of false alarms during 1000 hours of ageing. The search of new measurements to increase the score of poorly diagnosed faults thus improving diagnostic performance is a main perspective
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.
Nouiri, Jamel. "Étude pour la conception de transducteurs gestuels à retour d'effort et de modèles de systèmes mécaniques pour leur contrôle : application à un transducteur à grand nombre de degrés de liberté : le clavier rétroactif modulaire et au système de modélisation et de simulation temps réel CORDIS-ANIMA." Grenoble INPG, 1995. http://www.theses.fr/1995INPG0162.
Braconnier, Benjamin. "Modélisation numérique d'écoulements multiphasiques pour des fluides compressibles, non miscibles et soumis aux effets capillaires." Bordeaux 1, 2007. http://www.theses.fr/2007BOR13381.
Wang, Ruomin. "Modélisation à haut niveau d'abstraction de l'intégrité du signal dans les bus de communication." Electronic Thesis or Diss., Paris 6, 2014. http://www.theses.fr/2014PA066196.
As a result of continuing growth of electronic technology, signal integrity analysis has now become a more and more critical challenge in the electronic systems design process. To address this issue, designers have introduced several approaches. However, due to the higher heterogeneity of modern applications, along with time-to-market constraints, a new modeling methodology is required to provide the system?s signal integrity performance at a high-level of abstraction. Moreover, it should be easily interoperable with the system?s functional model. The aim of this work is to propose a new modeling methodology for signal integrity analysis that can meet these requirements. Our method is based on the combination of two kinds of blocks, named functional blocks and non-functional blocks. They are built in C/C++ or SystemC/SystemC-AMS, in order to be easily simulated in a single environment. The functional block is used to model the ideal behavior of the system. The non-functional block is used to represent the highly nonlinear and non-ideal behaviors, caused by signal integrity issues. In the non-functional block, neural networks are used to model these non-ideal behaviors. To validate our method, we developed two applications based on I2C and USB 3.0 applications. Our method greatly increases simulation speed (99% faster than a SPICE model), while achieving a relative absolute error around 3%. Finally, our method is a flexible and modular approach since models can easily be parameterized and interoperable. In the future, this original method for high-level modeling of signal integrity could be integrated in the forthcoming design flows of cyber-physical systems
Falaize, Antoine. "Modélisation, simulation, génération de code et correction de systèmes multi-physiques audios : approche par réseau de composants et formulation Hamiltonienne à Ports." Electronic Thesis or Diss., Paris 6, 2016. http://www.theses.fr/2016PA066544.
The class of audio systems includes traditional musical instruments (percussion, string, wind, brass, voice) and electro-acoustic systems (guitar amplifiers, analog audio processing, synthesizers). These multi-physical systems have a common property: out of excitation sources (generators), they are all passive. We present a set of automatic methods dedicated to their modeling, simulation and control, which explicitly guarantee and exploit the passivity of the original system. This class of systems is that of port-Hamiltonian systems (PHS), introduced in system theory in the early 1990s. Regarding the models, we exploit the fact that the interconnection of systems described in this formalism explicitly preserves the dynamics of total dissipated power. This enabled the development of an automated method that builds models of complete instruments based on a dictionary of elementary models. Regarding the simulations, we developed a numerical method that preserves the passive structure of PHS in discrete-time domain. This ensures the stability of simulations (for which the C++ code is automatically generated). Regarding the control, we exploit the interconnection structure to automatically build an input-to-output decoupled form for a class of PHS. Systems of this class are flat, within the meaning of the differential flatness approach. A formula that yields the (open loop) control law for these systems is provided
Jaber, Chafic. "Modélisation de haut niveau d'abstraction de systèmes intégrés et estimation de performances. Application à une implémentation multi-processeurs de la couche physique d'une station de base LTE." Phd thesis, Télécom ParisTech, 2011. http://pastel.archives-ouvertes.fr/pastel-00673731.
Jaber, Chafic. "Modélisation de haut niveau de systèmes intégrés et estimation de performances : application à une implémentation multi-processeurs de la couche physique d’une station de base LTE." Phd thesis, Paris, Télécom ParisTech, 2011. https://pastel.hal.science/pastel-00673731.
The impressive advances in both fields of semiconductors and software engineering enabled modern System-on-Chip “SoC“ to hostcomplex and interdependent applications. These advances are coupled with higher systems complexity and heterogeneity. Thus, forcing designers to re-evaluate their design methodologies and to raise the level of abstraction to the system level targeting the co-design of the entire SoC rather than just individual components. The objective of this Thesis work is to provide the system designer with means (on the methodology and tools levels) to estimate system’s performances and evaluate rapidly and very early the design decisions in the SoC design flow. Our work provides contributions in two main aspects: (1)On the Conceptual Level, we defined (using the UML meta-modeling concepts) modeling concepts to estimate shared resources impact on system’s overall performances, by introducing the “virtual node” concept for scheduling and shared resources access control. Furthermore, we introduced the ”Communication Pattern” concept for modeling the interaction between architecture elements to ensure the orthogonalization of computation and communication concerns. (2)On the Simulation Level: A SystemC simulator was written to simulate the UML models. Simulation is done at a high level of abstraction and runs faster than real time execution. The usability and capabilities of our approach are shown with an industrial use case. We modeled a Freescale multi-core DSP platform for LTE base stations (LTE stands for Long Term Evolution is the 4G standard for cellular networks). The comparison of modeling results with implementation proved the accuracy of our approach
Falaize, Antoine. "Modélisation, simulation, génération de code et correction de systèmes multi-physiques audios : approche par réseau de composants et formulation Hamiltonienne à Ports." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066544/document.
The class of audio systems includes traditional musical instruments (percussion, string, wind, brass, voice) and electro-acoustic systems (guitar amplifiers, analog audio processing, synthesizers). These multi-physical systems have a common property: out of excitation sources (generators), they are all passive. We present a set of automatic methods dedicated to their modeling, simulation and control, which explicitly guarantee and exploit the passivity of the original system. This class of systems is that of port-Hamiltonian systems (PHS), introduced in system theory in the early 1990s. Regarding the models, we exploit the fact that the interconnection of systems described in this formalism explicitly preserves the dynamics of total dissipated power. This enabled the development of an automated method that builds models of complete instruments based on a dictionary of elementary models. Regarding the simulations, we developed a numerical method that preserves the passive structure of PHS in discrete-time domain. This ensures the stability of simulations (for which the C++ code is automatically generated). Regarding the control, we exploit the interconnection structure to automatically build an input-to-output decoupled form for a class of PHS. Systems of this class are flat, within the meaning of the differential flatness approach. A formula that yields the (open loop) control law for these systems is provided
Prigent, Corentin. "Etude numérique et modélisation du modèle d'Euler bitempérature : point de vue cinétique." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0201/document.
In various domains of physics, several phenomena can be modeled via the use of nonconservative hyperbolic systems. In particular, in plasma physics, in the process of developping and understanding the phenomena leading to Inertial Confinement Fusion, the bi-temperature Euler sytem can be used to model particle transport phenomena in a plasma. The difficulty of the mathematical study of such systems dwells in the presence of so-called non-conservative products, which prevent the classical definition of weak solutions via distribution theory. To attempt to define these quantities, it is useful to supplement the hyperbolic system with an underlying kinetic model. In this work, the objective is the numerical study of such kinetic systems in order to solve the bi-temperature Euler system.This manuscript is split in two parts. The first one contains the study of the bi-temperature Euler system. In the first chapter, this system in dimension 1 is solved by the use of an underlying kinetic model sprung from plasma physics: the Vlasov-BGK-Ampère system. An asymptotic-preserving numerical method is introduced, and it is shown that the scheme obtained in the limit is consistant with a scheme for teh bi-temperature Euler system. In the following chapter, the same hyperbolic model in dimension 2 is studied, this time via a discrete-BGK type underlying model. An entropy inequality is proved for solutions coming from the kinetic model, as well as a discrete entropy dissipation inequality.In the second part of the manuscript, we are interested in the development of numerical schemes for gas mixture rarefied flows. Firstly, an adaptive kinetic scheme is introduced for inert gas mixtures. By the use of discrete conservation laws, the solution is approximated on a set of discrete velocities that depends on space, time and species. Secondly, an extension of the method is proposed in order to improve the efficiency of the first method. Finally, the two methods are compared to the classical fixed grid method on a series of test cases.In the last chapter, a numerical method is proposed for rarefied flows of reacting mixtures. The setting considered is the case of slow bimolecular reversible chemical reactions. The method introduced is an explicit-implicit treatment of the relaxation operator, which is shown to be stable, linear and conservative
Beets, Eric. "Modélisation des systèmes mécaniques articulés flexibles par utilisation des coordonnées naturelles et des équations de Kane : expérimentation et validation numérique." Valenciennes, 1997. http://www.theses.fr/1997VALE0039.
The simulation of multibody dynamics has known an important expand since the 60's. Until the end of the 70's, bodies were considered as rigid in the most of software packages. Results are excellent as long as deformations remain weak. However, the simulation of large sizes or high-speed revolving mechanisms, as well as the optimization of masses, needs to take structural flexibilities into account. During the development of a flexible multibody formalism, it is necessary to choose the descriptive coordinates systems allowing to position the moving reference frame and the type of the motion equations. The former affects directly the facility of the mechanism description as well as the operative cost. We have therefore chosen to develop a method based on Kane’s equations in natural coordinates. These last lead to a simple and “natural” description of the mechanism and to a limited number of descriptive coordinates. Kane’s equation generate besides a minimal number of motion equations. The finite element method is here employed to introduce the elastic coordinates and the component mode s used in order to reduce the number of degrees of freedom. It is also possible to increase the step of the numerical integration method. A software based on this method has therefore been developed. Two benchmarks allow us to conclude that, for similar results, CPU times are inferior to classical methods based on the one hand on Lagrange’s equations in absolute coordinates and on the other hand on Lagrange’s equation in natural coordinates. Moreover, the realization of an experimental flexible four bars mechanism allows showing that the method gives results close to effective working conditions
Mallouk, Issam. "Modélisation d’une assistance décisionnelle basée sur l’intelligence artificielle pour les systèmes cyber-physiques : Application à la maintenance dans le domaine du Transport." Electronic Thesis or Diss., Valenciennes, Université Polytechnique Hauts-de-France, 2023. http://www.theses.fr/2023UPHF0025.
Cyber-physical systems (PCS) are complex and interconnected systems, where digital technologies converge with the physical world, having revolutionized many sectors of activity. The Internet of Things (IOT) has also encouraged the massive collection of data, thus contributing to the development of "Big Data". However, the development of IOT and SCPs has created challenges, mainly related to massive data management and decision-making. The development of approaches such as Data Analytics and Machine Learning, however, offers solutions by identifying “hidden” patterns or characteristics within this massive data.This thesis addresses the problem of decision-making by using the approaches and techniques of Artificial Intelligence and is particularly interested in the Transportation applicative field. Modern transport systems, considered as complex Cyber Physical Systems, incorporate a wide variety of mechatronic equipment. They are increasingly autonomous, equipped with sensors allowing them to perceive their environment and means allowing interaction with fleet managers. A holistic approach to fleet management helps improve various functions such as maintenance planning and operations management.The thesis focuses on the cyber loops associated with the operation of cyber physical systems, with a focus on the maintenance activity. It offers decision-making assistance by characterizing cybernetic loops, specifying the needs of decision-makers, and developing Machine Learning approaches while respecting the requirements of genericity and technological independence. The modeling of this assistance is based on a holonic decomposition of the SCP and uses Rasmussen's typology at the level of decision making. A methodological guide accompanies this approach.The concepts proposed in this thesis work have been validated through two industrial collaborations. A first collaboration with the Moroccan company STMF has made it possible to optimize the maintenance of a fleet of trucks transporting hazardous materials. A second collaboration with ALSTOM aims to improve the reliability growth of railway rolling stock by detecting warning signs of a failure
Meziani, Yeser. "A Kinematic Framework for Upper Extremity Rehabilitation Assessment : Expectation- Maximization as a Motor Learning Model." Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0096.
Motor learning as a recovery mechanism is assumed to be a framework that drived and guided physical therapy and now since the advent of robotics doing the same to the rehabilitation devices. The rehabilitation process presents the intersection of many different interconnected facets that co-interact to produce recovered movements. The use of the technology introduces many benefits while contributing to the complexity of the phenomena at hand. We interest our research to the passive exosquelette training of the upper limb. We propose an adaptive intra patient assessment scale that is capable of detecting intra-patient performance changes during robotic training. Motor learning, the process of our brain's acquiring newer motor skills or relearning those he lost due to neurological or traumatic incident is our portal to investigating this phenomenon. The interaction of the system that is composed of the device, the incentive in form of exercise games and the patients with all its level of existence, physiological, psycho-logical, and cognitive is the system of study. The components present heterogeneous qualities and dynamically driven changes. The system output in the form of the trajectories executed is our gauging instrument to investigate the interactions within the system. We formulate the trajectory model as a Markov Chain and use the Kalman Filter to estimate the smoothed states. While dynamics are variant in time we model the assumptions about the movement into a dynamical formulation and estimate its parameters from data. To account for the time variability we introduce parallel noise source to the dynamics and estimate it using an Expectation-Maximization algorithm. The temporal nature being only a single facet of the kinematic phenomena, we assume a variable temporal alignment and estimate it using Expectation-Maximization iteration to increase the likelyhood of the estimated model compared to the observed trajectories. Once learned the model dependent and extracted parameters are used to compare between differences in performance. The properties of the clinical assessment tools are investigated and results are formulated to answer the commonly reported needs. Stemming from the same fundamentals of motor learning, we aimed to define a new visual assessment instrument that is intended to fulfill the need of patient-first easily communicated feedback form. We present and assess clinical properties of the tools while providing validating results on clinical data attesting the longitudinal sensitivity of the tool. The underlying assumption of the visualization was then assessed using an objective measure of maximum probability value derived using a probabilistic model of the trajectories and expected on a highly likely trajectory model learned using a Kernel-Near-Neighbors Regressor
Lebreton, Jérémy. "Observations et modélisation des systèmes planétaires autour des étoiles proches." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00952803.
Boussetta, Hela. "Modélisation multi-physiques et simulation globale de systèmes autonomes sur puce." Grenoble INPG, 2010. http://www.theses.fr/2010INPG0008.
The aim of this work was to propose a multi-level and multi-physics modeling methodology. To reach this goal, we have provided a library of VHDL-AMS implemented models for different blocks of a node of a wireless Sensor Network. The first block is a piezoelectric microgenerator which harvests mechanical energy and converts it into electrical energy to supply the other parts of the system. The second block is an energy storage system. An electrical model of a Li-Ion battery implemented in VHDL-AMS has been provided. A library of VHDL-AMS and SPICE models had been provoded for the energy management block. Tow abstraction levels for this pure electrical block were considered : a technology independent level and a level related to the CMOS 130nm ST Microelectronics technology. In the last chapter, global simulations aiming to give an overview of the possibilities provided by this methodology were presented. In addition, comparisons with experimental results were proposed throughout this report
Mkadara, Geneviève. "Contribution à la surveillance des pompes hydrauliques à pistons axiaux pour les hélicoptères, avec un accent particulier sur la modélisation à paramètres localisés." Thesis, Toulouse, INSA, 2020. http://www.theses.fr/2020ISAT0020.
This dissertation presents a contribution to helicopter axial piston pump monitoring through modelling and simulation. A lumped-parameter model of such pump is developed to serve as a virtual test bench for monitoring studies. As lumped-parameter models of axial piston pumps are less detailed than distributed-parameter models, the author proposes improvements of lumped-parameter modelling state-of-the-art, focusing on the monitoring industrial need. The proposal concentrates on the pressure compensator simulation in degraded conditions, and on the slipper/swashplate leakage computation through a variable gap height. The developed pump model is compared to experimental data. Then, a graphical tool is proposed, (the Damage Identification Curve, DIC), which allows for the isolation of pump degradation within the hydraulic system using discharge and case drain pressure steady-state measurements. The study is concluded by recommendations for increasing the maturity level of the proposed monitoring approach
Metzig, Cornelia. "A Model for a complex economic system." Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENS038/document.
The thesis is in the field of complex systems, applied to an economic system. In this thesis, an agent-based model has been proposed to model the production cycle. It comprises firms, workers, and a bank, and respects stock-flow consistency. Its central assumption is that firms plan their production based on an expected profit margin. A simple scenario of the model, where the expected profit margin is the same for all firms, has been analyzed in the context of simple stochastic growth models. Results are a firms' size distribution close to a power law, and tent-shaped growth rate distribution, and a growth rate variance scaling with firm size. These results are close to empirically found stylized facts. In a more comprehensive version, the model contains additional features: heterogeneous profits margins, as well as interest payments and the possibility of bankruptcy. This relates the model to agent-based macroeconomic models. The extensions are described theoretically theoretically with replicator dynamics. New results are the age distribution of active firms, their profit rate distribution, debt distribution, bankruptcy statistics, as well as typical life cycles of firms, which are all qualitatively in agreement with studies of firms databases of various countries.The proposed model yields promising results by respecting the principle that jointly found results may be generated by the same process, or by several ones which are compatible
Fil, Nicolas. "Caractérisation et modélisation des propriétés d’émission électronique sous champ magnétique pour des systèmes RF hautes puissances sujets à l’effet multipactor." Thesis, Toulouse, ISAE, 2017. http://www.theses.fr/2017ESAE0025/document.
Space communication payload as well as magnetic confinement fusion devices, among other applications, are affected by multipactor effect. This undesirable phenomenon can appear inside high frequency (HF) components under vacuum and lead to increase the electron density in the vacuum within the system. Multipactor effect can thus disturb the wave signal and trigger local temperature increases or breakdowns. This PhD research aims to improve our understanding and the prediction of the multipactor effect. The multipactor phenomenon is a resonant process which can appear above a certain RF power threshold. To determine this power threshold, experimental tests or/and simulations are commonly used. We have made a study to evaluate the multipactor power threshold sensitivity to the TEEY. Two particular critical parameters have been found: first cross-over energy and the energies between the first cross-over and the maximum energies. In some situations, the HF components are submitted to DC magnetic fields which might affect the electron emission properties and hence the multipactor power threshold. Current multipactor simulation codes don’t take into account the effect of the magnetic field on the TEEY. A new experimental setup specially designed to investigate this effect was developed during this work. Our new experimental setup and the associated TEEY measurement technique were analysed and optimized thanks to measurements and SPIS simulations. We used the setup to study the influence of magnetic field perpendicular to the sample surface on the TEEY of copper. We have demonstrated that the magnetic field affects the copper TEEY, and hence multipactor power threshold
DRESS, CHRISTOPHE. "Methodes et applications de la physique des systemes desordonnes." Paris 6, 1995. http://www.theses.fr/1995PA066763.
Belkadi, Djilali. "Contribution à la modélisation et à la simulation des circuits intégrés analogiques : application aux systèmes échantillonnés et aux circuits linéaires de haute fréquence." Grenoble INPG, 1997. http://www.theses.fr/1997INPG0062.
Vincent, Benjamin. "Modélisation et analyse des systèmes de commande multi-physiques." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAT091.
% The thesis aims at studying and developing structured-based approaches for the modelling and analysis of distributed parameter systems where thermodynamic contributions cannot be neglected. Geometric formalisms are considered for the representation of this class of dynamical systems. Key contributions include structured modelling from first principle equations, structure-preserving geometric reduction and discretization, and passivity and stability analysis for multi-physics systems based on total irreversible entropy production. The thesis is motivated by two applications: the control of burning plasma profiles in Tokamaks; and, the rejection of thermoacoustic unstabilities in a Rijke's tube. The second application illustrates an instable thermoacoustic phenomenon arising experimentally under specific geometry and heating conditions within a vertical tube. Both systems are formulated as structured ones through port-Hamiltonian and GENERIC formalisms
Bellache, Kosseila. "Caractérisation Multi-physique des éléments de stockage électrochimique et électrostatique dédiés aux systèmes Multi sources : Approche systémique pour la gestion dynamique d'énergie électrique." Thesis, Normandie, 2018. http://www.theses.fr/2018NORMLH21.
This thesis work is a continuation of the research activities of the GREAH laboratory on the issues of the management of electrical energy and improving the energy quality of production systems for renewable energy. Indeed, the coupling of several different nature sources entails the problems of dimension, quality of energy and the lifetime of the interconnected elements. The scientific approach is based on the characterization of the evolution of the resistances and capacitances of the batteries/supercapacitors cells according to the electrical and thermal constraints, followed by the modeling of accelerated cells aging. In this thesis, we propose improvements to the dynamic response of an electric propulsion fluvial boat by using the hybrid system of lithium-batteries and supercapacitors. We also propose an electrothermal approach for the multi-physical characterization and modeling of the batteries and supercapacitors aging, using combined constraints of the temperature and frequency of the DC current ripples. The experimental data has been collected to establish models of batteries and supercapacitors dedicated to multi-source systems including renewable energy sources (wind and tidal turbines). The results of the developed models shown high accuracy compared with experimental results. These models illustrated a good description of the aging phenomenon of batteries/ supercapacitors due to charging/discharging operations with a fluctuating continuous current combined with a variable temperature
Serban, Didina. "Systemes quantiques integrables et leurs applications a la physique statistique." Paris 11, 1996. http://www.theses.fr/1996PA112271.
Royer, Patrick. "Contribution a l'analyse d'identifiabilite de systemes issus d'une modelisation physique." Paris, CNAM, 1997. http://www.theses.fr/1997CNAM0300.
El, Azzouzi Khalid. "Modélisation et simulation numérique à l’échelle des fibres du comportement dynamique d’un multifilament unidirectionnel en placement de fibres robotisé." Thesis, Ecole centrale de Nantes, 2016. http://www.theses.fr/2016ECDN0027.
The mechanical behavior of the carbon tow in lateral pressure characterized by the relative movement between fibers giving it a non-linear behavior because of the contact inter-fibers. The fact that the fibrous structure of the tow makes it difficult to characterize its mechanical behavior during the automated placement. The complexity of the mechanical modeling of this fibrous media at fiber scale is due to the fact that the mechanical non-linearity depends in large part to the geometric configuration of fibers, the friction between fibers and also the dynamic environment of the placement. The mechanical modeling complexity is a consequence of the tight coupling between loading and deformation directions modifying the microstructure. This thesis is in keeping with the parameter optimization of the Automated Dry Fiber Placement process with a laser heat source. In order to improve understanding the thermos-mechanical behavior of tow during placement, a dynamic model has been developed to simulate the interaction between fibers. The aim is to be able to predict the geometric configuration of fibers under loading, as well as the position of the contact points. These works are the first step to achieving the objective of identifying and optimizing process parameters in order to increase the lay down speed as well as the quality of the preform
Philippot, Alexandre. "CONTRIBUTION AU DIAGNOSTIC DECENTRALISE DES SYSTEMES A EVENEMENTS DISCRETS : APPLICATION AUX SYSTEMES MANUFACTURIERS." Phd thesis, Université de Reims - Champagne Ardenne, 2006. http://tel.archives-ouvertes.fr/tel-00136967.
Ce mémoire de thèse présente une approche décentralisée avec coordinateur pour le diagnostic des Systèmes à Evénements Discrets (SED) et plus particulièrement pour les systèmes manufacturiers composés de capteurs et d'actionneurs discrets. Cette approche considère la Partie Opérative (PO) comme un ensemble d'éléments composé d'un actionneur et d'un ensemble de capteurs. La construction des diagnostiqueurs s'appuie sur une modélisation modulaire des éléments de la Partie Opérative, d'un modèle des spécifications de la Partie Commande (PC) et d'une information temporelle liée à la réactivité des actionneurs. Chaque diagnostiqueur représente un observateur de l'état du système affecté d'une étiquette de décision, cette décision étant le résultat de l'observation des événements, des conditions sur les états du système et/ou sur le temps de retard entre événements.
Afin de définir la capacité de l'ensemble des diagnostiqueurs locaux à diagnostiquer un ensemble de défauts dans un délai fini, une notion de codiagnosticabilité a été établie. Dans cette thèse, cette notion tient compte de la modélisation des défauts à base d'événements, à base d'états et à base d'informations temporelles. Elle détermine ainsi l'ensemble des défauts que la structure décentralisée peut diagnostiquer.
L'ensemble des décisions locales doit être ensuite agrégé afin d'obtenir une décision globale sur l'état du système. Cette fusion est réalisée par un coordinateur construit à partir d'un ensemble de règles permettant de résoudre les différents problèmes d'indécision et d'ambiguïté entre les diagnostiqueurs locaux. Ce coordinateur permet d'obtenir des performances de diagnostic équivalentes à celles d'un diagnostiqueur centralisé. Deux exemples d'applications manufacturières illustrent l'efficacité et l'intérêt de la structure décentralisée en terme d'explosion combinatoire. Un simulateur basé sur Stateflow de Matlab permet de tester et valider l'approche proposée.
Florens, Serge. "Coherence et localisation dans les systemes d'electrons fortement correles." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2003. http://tel.archives-ouvertes.fr/tel-00005825.
GASCON, Ferran. "Modélisation physique d'images de télédétection optique." Phd thesis, Université Paul Sabatier - Toulouse III, 2001. http://tel.archives-ouvertes.fr/tel-00009863.
Boussaid, Khaled. "Sols intermédiaires pour la modélisation physique." Nantes, 2005. http://www.theses.fr/2005NANT2130.
Gascon, Ferran. "Modélisation physique d'images de télédétection optique." Toulouse 3, 2001. https://tel.archives-ouvertes.fr/tel-00009863.
Mallet, Jessy. "Contribution à la modélisation et à la simulation numérique multi-échelle du transport cinétique électronique dans un plasma chaud." Thesis, Bordeaux 1, 2012. http://www.theses.fr/2012BOR14584/document.
In plasma physics, the transport of electrons can be described from a kinetic point of view or from an hydrodynamical point of view.Classically in kinetic theory, a Fokker-Planck equation coupled with Maxwell equations is used to describe the evolution of electrons in a collisional plasma. More precisely the solution of the kinetic equations is a non-negative distribution function f specifying the density of particles as a function of velocity of particles, the time and the position in space. In order to approximate the solution of such problems, many computational methods have been developed. Here, a deterministic method is proposed in a planar geometry. This method is based on different high order numerical schemes. Each deterministic scheme used presents many fundamental properties such as conservation of flux particles, preservation of positivity of the distribution function and conservation of energy. However the kinetic computation of this accurate method is too expensive to be used in practical computation especially in multi-dimensional space.To reduce the computational time, the plasma can be described by an hydrodynamic model. However for the new high energy target drivers, the kinetic effects are too important to neglect them and replace kinetic calculus by usual macroscopic Euler models.That is why an alternative approach is proposed by considering an intermediate description between the fluid and the kinetic level. To describe the transport of electrons, the new reduced kinetic model M1 proposed is based on a moment approach for Maxwell-Fokker-Planck equations. This moment model uses integration of the electron distribution function on the propagating direction and retains only the energy of particles as kinetic variable. The velocity variable is written in spherical coordinates and the model is written by considering the system of moments with respect to the angular variable. The closure of the moments system is obtained under the assumption that the distribution function is a minimum entropy function. This model is proved to satisfy fundamental properties such as the non-negativity of the distribution function, conservation laws for collision operators and entropy dissipation. Moreover an entropic discretization in the velocity variable is proposed on the semi-discrete model. Moreover the M1 model can be generalized to the MN model by considering N given moments. The N-moments model obtained also preserves fundamental properties such as conservation laws and entropy dissipation. The associated semi-discrete scheme is shown to preserve the conservation properties and entropy decay
Joukhadar, Ammar. "Simulation dynamique et applications robotiques." Phd thesis, Grenoble INPG, 1997. http://www.theses.fr/1997INPG0069.
We describe models and algorithms designed to produce efficient and physically consistent dynamic simulations. These models and algorithms have been implemented within the RobotΦ system\cite(RAP95) which can potentially be configured for a large variety of interven\-tion-style tasks such as dextrous manipulations with a robot hand; manipulation of non-rigid objects; tele-programming of the motions of an all-terrain vehicle; and some robot assisted surgery tasks (e. G. Positioning of an artificial ligament in knee surgery). The approach uses a novel physically based modeling technique to produce dynamic simulations which are both efficient and consistent according to the laws of the Physics. The main advances over previous works in Robotics and Computer Graphics fields are twofold: the development of a unique framework for simultaneously processing motions, deformations, and physical interactions; and the incorporation of appropriate models and algorithms for obtaining efficient processing times while insuring consistent physical behaviors
Yin, Yuan. "Physics-Aware Deep Learning and Dynamical Systems : Hybrid Modeling and Generalization." Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS161.
Deep learning has made significant progress in various fields and has emerged as a promising tool for modeling physical dynamical phenomena that exhibit highly nonlinear relationships. However, existing approaches are limited in their ability to make physically sound predictions due to the lack of prior knowledge and to handle real-world scenarios where data comes from multiple dynamics or is irregularly distributed in time and space. This thesis aims to overcome these limitations in the following directions: improving neural network-based dynamics modeling by leveraging physical models through hybrid modeling; extending the generalization power of dynamics models by learning commonalities from data of different dynamics to extrapolate to unseen systems; and handling free-form data and continuously predicting phenomena in time and space through continuous modeling. We highlight the versatility of deep learning techniques, and the proposed directions show promise for improving their accuracy and generalization power, paving the way for future research in new applications
AZARIA, PATRICK. "Systemes frustres." Paris 6, 1988. http://www.theses.fr/1988PA066641.