Academic literature on the topic 'Effet d'inertie'
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Journal articles on the topic "Effet d'inertie"
Rouffiac, V., G. Pelle, and J. Ohayon. "Effets D'Inertie Et De Viscoelasticite Sur Le Comportement Mecanique Du Ventricule Gauche: Un Modele 2D." Archives of Physiology and Biochemistry 103, no. 3 (January 1, 1995): C153. http://dx.doi.org/10.3109/13813459509037357.
Full textDelache, Alexandre, Najib Ouarzazi, and Marie-Christine Neel. "Structuration de la convection mixte en milieu poreux confiné latéralement et chauffé par le bas : effets d'inertie." Comptes Rendus Mécanique 330, no. 12 (December 2002): 885–91. http://dx.doi.org/10.1016/s1631-0721(02)01535-8.
Full textDissertations / Theses on the topic "Effet d'inertie"
Debiais, Georges. "Etude théorique des phénomènes électro-optiques de relaxation : effets d'inertie et non-linéarité." Perpignan, 1992. http://www.theses.fr/1992PERP0130.
Full textAné, David. "Stratégie d'exploitation et architecture de commande du système DEFONTAINE." Nantes, 2008. http://www.theses.fr/2008NANT2136.
Full textThis work, undertaken in collaboration with company DEFONTAINE SA, is within the framework of researches for innovating solutions for the reduction of CO2 car emissions. The studied system, that we will name DEFONTAINE system, was the subject of two other complementary theses, which concern the design of two electric machines : a linear actuator and a permanent magnet synchronous machine. Its goal is to fulfill the principal functions of a thermal engine flywheel, while avoiding its disadvantages. Indeed, if the flywheel reduces the acyclisms of the thermal engine at low speed, it becomes disadvantageous during the vehicle accelerations. Our work has consisted to model and to control the actuators of DEFONTAINE system, in order to supervise its operation. First of all, we characterized the acyclisms of a thermal engine in sight, in particular, to emulate them on test bench. Then, we considered the sensorless control of a traditional synchronous machine based on an improvement of the Matsui estimation method coupled to siliding mode observers. We have implemented a global approach of the identification and the corrector tuning of the various control loops. This approach was transposed to the synchronous machine with trapezoidal distribution of the DEFONTAINE system, within an extended vector control. Two test benches were built and we experimentally validated the control of the synchronous machine with sinusoidal distribution (motor and generator) and the extended vector control of the synchronous machine of DEFONTAINE system
Rokrok, Ebrahim. "Controle en grid forming pour les convertisseurs d'électronique de puissance : application aux liaisons courant continus de Haute Tension (HVDC)." Electronic Thesis or Diss., Centrale Lille Institut, 2022. http://www.theses.fr/2022CLIL0012.
Full textThe rapid development of converter-based devices such as converter-interfaced renewable generations and high-voltage direct-current (HVDC) transmission links is causing a profound change into the very physics of the power system. In this scenario, the power generation is shifted from the pollutant synchronous generators based on nuclear or fossil fuels to converter-based renewable resources. The modeling, control, and stability of the power converters are now one of the focuses of attention for researchers. Today, power converters have the main function of injecting power into the utility grid, while relying on synchronous machines that ensure all system needs (e.g., ancillary services, provision of inertia and reliable power reserves). This operation mode of power converters is called "Grid-following". Grid-following converters have several limitations, such as: inability to operate in a standalone mode, stability issues under weak grids and faulty conditions and also, negative side effect on the system inertia. To tackle these challenges, the grid-forming control as an alternative has shown its appropriate performance that could make this kind of control a promising solution to respond to the system needs and to allow a stable and safe operation of power system with high penetration rate of power electronic converters. In this thesis, a fundamental description of grid-forming control with a simplified quasi-static modeling approach aiming to regulate the converter active power by a voltage source behavior is presented. From the description, several variants of grid-forming strategies are identified that represent some differences in terms of active power dynamic behavior, inertia emulation capability and system frequency support. Hence, the presented grid-forming variants are then classified according to their capabilities/functionalities. From the small-signal stability and robustness point of view, the studied grid-forming controls, which are implemented to a 2-level VSC at first, show their ability to operate under very weak grid conditions. Moreover, the ancillary services such as inertial response and frequency support are appropriately provided to the AC grid. The questions of the grid-forming converters protection against overcurrent and their post-fault synchronization while considering the current limitation are investigated and a new method is proposed to enhance the transient stability of the system. All the obtained results are then extended to a modular multi-level converter (MMC) topology successfully. The use of a grid forming control in an HVDC converter is interesting for the grid to which it is connected due to the inertial effect that can be induced. Therefore, the final part of this thesis evaluates the dynamic performance of an HVDC link interconnecting two AC grids and highlights the proper strategy and requirements for inertia provision
Thomas, Sébastien. "Modélisation numérique du comportement thermo-aéro-dynamique des garnitures d'étanchéité pour gaz réels hautes pressions." Phd thesis, Université de Poitiers, 2006. http://tel.archives-ouvertes.fr/tel-00135573.
Full textL'étude bibliographique révèle que peu de travaux sur les garnitures pour gaz à hautes pressions ont été réalisés. Les caractéristiques d'un écoulement à haute pression sont examinées et les points-clefs du modèle sont définis : gaz réels, effets d'inertie, effets thermiques, écoulement bloqué. A hautes pressions, le comportement du gaz diffère de celui d'un gaz parfait, un modèle de gaz réel est donc développé. L'équation de Reynolds pour un fluide compressible est modifiée afin de prendre en compte les effets d'inertie. Les effets thermiques dans l'écoulement sont également introduits dans le modèle. L'écoulement bloqué à la sortie du film fluide est résolu grâce à une méthode originale. Les déformations des solides et le couplage thermique sont pris en compte par la méthode des coefficients d'influence. La méthode des éléments finis est utilisée pour la discrétisation des équations et un algorithme itératif permet la détermination des champs de pression et de température. La comparaison avec une solution analytique et des données expérimentales permet de valider le modèle. L'influence du modèle du gaz est présentée. L'étude paramétrique menée avec le modèle numérique permet d'étudier l'influence des effets d'inertie sur l'écoulement par rapport au cas purement visqueux. Finalement, le couplage fluide-solides est étudié. Cette analyse montre que les déformations des faces influencent notablement le comportement des garnitures.
Salman, Oguz Umut. "Modeling of spatio-temporal dynamics and patterning mechanisms of martensites by phase-field and lagrangian methods." Paris 6, 2009. http://www.theses.fr/2009PA066221.
Full textBenbelkacem-Benmouffok, Ghania. "Viscoélasticité et écoulements de fluides structurés." Thesis, Vandoeuvre-les-Nancy, INPL, 2009. http://www.theses.fr/2009INPL012N/document.
Full textUnder this thesis, we look at the different behaviors of structured fluids (aqueous solutions of polymers, suspensions) under sheared flow. In the first part, we give a comprehensive description of the items constituting the material using a structural modeling, on the one hand and carrying out birefringence measures to qualify anisotropy objects on the other. Through the tentio-law, we show that the behavior of objects depends only on the applied stress. In addition, we study the conditions of objective measures to conduct a rigorous characterization, comparing creep and oscillations measures, and using an analytical approach. This will help develop a method for identifying viscoelastic parameters and their developments under shear, in both a linear and a no linear regime. The second part concerns the two-dimensional flows of fluids in a coaxial cylinder geometry centered and eccentred, in a wide gap. The objective is to study the local behavior of different fluids using the PIV technic. To do this, we realize an experimental reliable and accurate enough, in all the gap. The experimental device is validated by measurements on a Newtonian fluid. The measures allow to access the local law behavior of each material that we compare with the overall behavior of law given by the rheometer in the case of centered geometry . In addition, digital simulations on Fluent, were made to complement our study. The results for laminar flow, for different fluids: newtonian, little rhéofluidifiant and very rhéofluidifiant, show that it is possible to describe and predict the behavior of some fluid but the existing model in Fluent can not describe the behavior of very rheofluidifiant fluids which have a very strong heterogeneity gradients speed in the gap
Damavandi, Mohsen. "Effect of modeling methods on the body and head-neck-trunck moments of inertia calculations in individuals of different morphology." Thèse, 2008. http://hdl.handle.net/1866/6470.
Full textBordjane, Mustapha. "Modélisation et caractérisation dynamique des circuits d'admission et d'échappement des moteurs à combustion interne." Phd thesis, 2013. http://tel.archives-ouvertes.fr/tel-00842010.
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