Academic literature on the topic 'Diffraction en régime harmonique'
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Journal articles on the topic "Diffraction en régime harmonique":
Omara, Abdeslam, and Said Abboudi. "Influence des Conditions d’Entrée Variables sur le Transfert de Chaleur non-Stationnaire dans une Conduite Cylindrique." Journal of Renewable Energies 1, no. 2 (December 31, 1998): 109–23. http://dx.doi.org/10.54966/jreen.v1i2.950.
Moreau, A., I. Zaquine, A. Maruani, and R. Frey. "Réseaux minces de diffraction en régime de Bragg." Journal de Physique IV (Proceedings) 135, no. 1 (October 2006): 239–40. http://dx.doi.org/10.1051/jp4:2006135071.
Ouariri, Hassan. "Diffraction par des surfaces rigides de révolution d'un champ acoustique harmonique en hautes fréquences." Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy 326, no. 1 (January 1998): 55–60. http://dx.doi.org/10.1016/s1251-8069(97)86953-9.
Jacquot, B., and M. Pontonnier. "La source CAPRICE 10 GHz en mode harmonique 2(ωHF − ωCe) = 0 production d'ions d'éléments métalliques en régime continu." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 295, no. 1-2 (October 1990): 5–11. http://dx.doi.org/10.1016/0168-9002(90)90415-3.
Ali, L. Ait, D. Kourtiche, A. V. Detti, A. Chitnalah, and M. Nadi. "Avantages du second harmonique généré par non linéarités ultrasonores en reconstruction d'images tomographiques par diffraction." ITBM-RBM 23, no. 2 (April 2002): 72–78. http://dx.doi.org/10.1016/s1297-9562(02)80018-3.
David, Jérôme. "La littérature au régime." Fabula-LhT : littérature, histoire, théorie, no. 23 (January 9, 2020). http://dx.doi.org/10.58282/lht.2431.
Dissertations / Theses on the topic "Diffraction en régime harmonique":
Dubois, Pierre. "Optimisation de structures rayonnantes métalliques 3D par déformation de surfaces iso-niveaux en régime harmonique." Paris, ENMP, 2005. http://www.theses.fr/2005ENMP1373.
Badia, Ismaïl. "Couplage par décomposition de domaine optimisée de formulations intégrales et éléments finis d’ordre élevé pour l’électromagnétisme." Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0058.
In terms of computational methods, solving three-dimensional time-harmonic electromagnetic scattering problems is known to be a challenging task, most particularly in the high frequency regime and for dielectric and inhomogeneous scatterers. Indeed, it requires to discretize a system of partial differential equations set in an unbounded domain. In addition, considering a small wavelength λ in this case, naturally requires very fine meshes, and therefore leads to very large number of degrees of freedom. A standard approach consists in combining integral equations for the exterior domain and a weak formulation for the interior domain (the scatterer) resulting in a formulation coupling the Boundary Element Method (BEM) and the Finite Element Method (FEM). Although natural, this approach has some major drawbacks. First, this standard coupling method yields a very large system having a matrix with sparse and dense blocks, which is therefore generally hard to solve and not directly adapted to compression methods. Moreover, it is not possible to easily combine two pre-existing solvers, one FEM solver for the interior domain and one BEM solver for the exterior domain, to construct a global solver for the original problem. In this thesis, we present a well-conditioned weak coupling formulation between the boundary element method and the high-order finite element method, allowing the construction of such a solver. The approach is based on the use of a non-overlapping domain decomposition method involving optimal transmission operators. The associated transmission conditions are constructed through a localization process based on complex rational Padé approximants of the nonlocal Magnetic-to-Electric operators. The number of iterations required to solve this weak coupling is only slightly dependent on the geometry configuration, the frequency, the contrast between the subdomains and the mesh refinement
Bériot, Hadrien. "Eléments finis d'ordre élévé pour l'opérateur de Galbrun en régime harmonique." Compiègne, 2008. http://www.theses.fr/2008COMP1791.
Investments in Computational methods for aeroacoustic have grown recently due to their application in the transportation sector. To account for the flow effects in the propagation zones, the Linearized Euler Equations (LEE) are generally preferred. If robust methods are available in the time domain, practically no methods have been proposed in the frequency domain on unstructured grids. In this manuscript, we propose an original finite element method for the operator of Galbrun, known to be physically equivalent to the LEE. To stabilize the numerical scheme and improve the performance, a mixed high-order approach is employed. A complete dispersion analysis of high-order methods in the presence of flow is performed. Validations are proposed in ducted swirling flows based on Pridmore-Brown's model. Acoustic and hydrodynamic phenomenon are examined as well as the use of non reflecting conditions
Patiño, López Luis david. "Caractérisation des propriétés thermoélectriques des composants en régime harmonique : techniques et modélisation." Bordeaux 1, 2004. http://www.theses.fr/2004BOR12792.
Wang, Yaw-Juen. "Modélisation déterministe et probabiliste en régime harmonique d'un convertisseur triphasé à commutation naturelle." Grenoble INPG, 1993. http://www.theses.fr/1993INPG0049.
Touati, Karim. "Photothermoélectricité : Modélisation en régime harmonique et caractérisation de matériaux thermoélectriques solides et liquides." Thesis, Littoral, 2016. http://www.theses.fr/2016DUNK0418/document.
The use of the self-induced Seebeck effect in thermophysical characterization of solid and liquid thermoelectric (TE) materials is described in this manuscript. In previous works, the photothermoelectric technique (PTE) has been developed in our laboratory for the thermal characterization of solid TE materials having low electrical conductivities. In this work, we first generalized the use of the PTE technique to all solid thermoelectric materials (with high or low electrical conductivities). This is achieved by taking into account the Gaussian shape of the thermal source exciting the material as well as by the understanding of the coupling effects between thermal and electrical transport mechanisms when a TE material is submitted to a modulated thermal excitation. In this thesis, several solid thermoelectric materials were studied : Titanium trisulfide (TiS₃),Bi₂Ca₂Co₁,₇Oₓ oxydes and Bismuth Selenido-telluride (Bi₂Te₂,₄Se₀,₆). Then, the self-induced Seebeck voltage was used for the detection of phase transitions exhibited by certain thermoelectric materials. The case of the copper selenide (Cu₂Se) was studied. A new procedure allowing to follow the temperature dependance of the thermal diffusivity of solid TE materials is also presented. In this work, the PTE technique was extended to liquid thermoelectric (LTE) materials. Indeed, a theoretical model describing the signal delivered by a LTE material subject to a periodic thermal excitation has been developed. Then, a study of the evolution of the thermal properties of an electrolyte as function of a solute concentration was performed. Finally, the thermal-wave resonator cavity (TWRC) approach was used to characterize thermally LTE materials. As far as we know, this is the first method proposing a TWRC approach applied directly to the sensor itself. The use of LTE such as heat sensors was also addressed here
Manescu, Léonardo-Géo. "L'étude du régime non-sinusoïdal dans les systèmes électriques." Phd thesis, Grenoble INPG, 1998. http://tel.archives-ouvertes.fr/tel-00821087.
Duruflé, Marc. "Intégration numérique et éléments finis d'ordre élevé appliqués aux équations de Maxwell en régime harmonique." Phd thesis, Paris 9, 2006. http://tel.archives-ouvertes.fr/tel-00068590.
équations de Maxwell en régime fréquentiel, afin de calculer
précisément la signature radar de cibles diverses. Pour avoir
une grande précision nécessaire pour des expérience de grande taille,
nous utilisons des méthodes d'ordre élevé.
Dans le cas scalaire, les éléments finis spectraux hexaédriques
avec condensation de masse, permettent d'obtenir un produit matrice vecteur
rapide et peux coûteux en stockage. Dans le cas vectoriel, les hexaèdres
de la première famille ne réalisent pas la condensation de masse, mais on peut
écrire un algorithme rapide de produit matrice-vecteur. Des résultats
numériques 3-D montrent la performance de l'algorithme proposé.
Nous traitons également le cas où la géométrie présente
une symétrie de révolution. On est alors ramenés à une succession
de problèmes 2-D indépendants.
Nous proposons une méthode éléments finis d'ordre élevé
couplée à des équations intégrales d'ordre élevé.
Bodrero, Alain. "Contrôle d'un champ acoustique à l'intérieur d'une cavité par des moyens passifs en régime harmonique." Rouen, 1999. http://www.theses.fr/1999ROUES029.
Demaldent, Edouard. "Etude de schémas de discrétisation d'ordre élevé pour les équations de Maxwell en régime harmonique." Paris 9, 2009. https://bu.dauphine.psl.eu/fileviewer/index.php?doc=2009PA090028.
This thesis deals with numerical simulation issues, and concerns the study of time- harmonic electromagnetic scattering problems. We are mainly interested in integral re-presentation methods and in simulations that need the use of a direct solver. Their range of application is rapidly limited with classical approximation schemes, since they require a large number of unknowns to achieve accurate results. To overcome this problem, we intend to adapt the spectral finite element method to electromagnetic integral equa-tions, then to the hybrid boundary element - finite element method (BE-FEM). The main advantage of our approach is that the Hdivconforming property (Hdiv-Hcurl within the BE-FEM) is enforced, meanwhile it can be interpreted as a point-based scheme. This al-lows a significant increase of the approximation order, that yields to a dramatical decrease of both the number of unknowns and computational costs, while ensuring the accuracy of the result. Another originality of our study lies in the development of high-order ani-sotropic hexahedral elements, to deal with conducting scatterers coated with a thin layer of material. Key words :computational electromagnetics, Maxwell equations, integral equations, hybrid boundary element - finite element method, method of moments, spectral finite element method, high-order approximation
Book chapters on the topic "Diffraction en régime harmonique":
Amra, Claude, and Michel Lequime. "Chapitre 2 Régime harmonique." In De l'Optique électromagnétique à l'Interférométrie, 29–50. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-1090-1-004.
Amra, Claude, and Michel Lequime. "Chapitre 2 Régime harmonique." In De l'Optique électromagnétique à l'Interférométrie, 29–50. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-1090-1.c004.