Letteratura scientifica selezionata sul tema "Mécanique non linéaire – Simulation par ordinateur"
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Articoli di riviste sul tema "Mécanique non linéaire – Simulation par ordinateur":
Sardet, Alix, Nicolas Estre, Daniel Eck, Frédéric Moutet e Emmanuel Payan. "Extension algorithmique du champ de vue tomographique à des objets de toutes dimensions". e-journal of nondestructive testing 28, n. 9 (settembre 2023). http://dx.doi.org/10.58286/28512.
Tesi sul tema "Mécanique non linéaire – Simulation par ordinateur":
Hamlili, Hassane. "Simulation de problèmes de la mécanique non linéaire du solide par éléments finis sur micro-ordinateur". Vandoeuvre-les-Nancy, INPL, 1990. http://www.theses.fr/1990INPL045N.
Negrello, Camille. "Méthodes fortement parallèles pour la simulation numérique en mécanique non linéaire des structures". Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLN049/document.
This thesis is aimed to contribute to the adoption of virtual testing, an industrial practice still embryonic which consists in optimizing and certifying by numerical simulations the dimensioning of critical industrial structures. The virtual testing will allow colossal savings in the design of mechanical parts and a greater respect for the environment, thanks to optimized designs. In order to achieve this goal, new calculation methods must be implemented, satisfying more requirements concerning safety, respect for hardware architectures, fastness, and compatibility with the time constraints of engineering.We are interested in the parallel resolution of large nonlinear problems by domain decomposition methods. Our goal is to approximate the exact solution by minimizing communication between subdomains. In order to do this, we want to maximize the computations performed independently by subdomain, using nonlinear relocation approaches. We also try to control the convergence criteria of the nested solvers in order to avoid over-resolution and divergences, to improve the construction of conditions Of mixed interface, and non-linearizing the preconditioning step of the solver. The ultimate objective being to deal with problems of industrial complexity, the robustness of the methods we develop will be a constant concern.Conventionally, non-linear problems are solved by constructing a sequence of linear systems that can be solved in parallel using iterative methods, such as Krylov solvers. We wish to question this usual procedure by trying to construct a sequence of small independent nonlinear systems to be solved in parallel. Such a technique involves the use of interleaved iterative solvers, whose convergence criteria must be dynamically tuned in order to avoid both over-resolution and loss of convergence. The robustness of the method can be ensured in particular by the use of well-constructed mixed interface conditions and well-chosen preconditioners
Fouial, Karim. "Nouvelle méthode d'interprétation des mesures des contraintes par surcarottage adaptée aux roches à comportement non linéaire ou fracturées". Vandoeuvre-les-Nancy, INPL, 1997. http://www.theses.fr/1997INPL109N.
Sauvage, Renaud. "Étude des effets de compressibilité à grands nombres de mach par simulation numérique directe d'une couche cisaillée". Toulouse, INPT, 2000. http://www.theses.fr/2000INPT053H.
Saad, Roy. "Sur une approche à objets généralisée pour la mécanique non linéaire". Thesis, Aix-Marseille 1, 2011. http://www.theses.fr/2011AIX10137/document.
The problems occurring today in computational mechanics and related domains are complex, and may involve several physics at different time and space scales. The numerical treatment of complex problems is in general tough and time consuming. In this context, the interest to develop methods and tools to accelerate the integration of new formulations into simulation tools is obvious. This work arises on the issue of the development of computational tool. The proposed approach covers the development process of numerical models from the variational statement to the simulation tool. The approach is applied to the finite element method. We have developed generic concepts to automate the development of the finite element method. To achieve this goal, we relied on tensor analysis applied in the context of the finite element method. The mathematical formalism is based on the tensor algebra to describe the discretization of a variational formulation. The generic character of the approach is preserved through the object-oriented approach in Java. We propose a framework based on object-oriented concepts capable of handling symbolic developments of elemental contributions for finite element codes. The advantage of this approach is the generic description that can be extended naturally to any discretization model in space or time. This concept is fully validated for simple linear problems (elasticity, heat convection, ...), for the treatment of mixed variational formulations (thermo-mechanical, Navier-Stokes for incompressible flows...) and Lagrangian frameworks (elasticity in larges transformations, hyperelasticity, ...)
Alsaleh, Hassan. "Modélisation non-linéaire en trois dimensions de l'interaction sol-micropieux-pont sous chargements sismiques". Lille 1, 2007. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2007/50376-2007-Alsaleh.pdf.
Desobry, David. "Génération de maillages hexaédriques pour des simulations de grandes déformations". Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0163.
This thesis focuses on the development of hexahedral meshing methods suitable for large deformation simulations in non-linear mechanics. Domain parameterization methods based on frame fields are used to generate high-quality hexahedral meshes aligned with the domain boundaries. However, during large deformations, the mesh quality may degrade and potentially block the simulation. This thesis explores the idea of determining an optimal connectivity for the mesh elements while taking into account the anticipated deformations.In 2D, a complete pipeline is developed to tackle this challenge by combining previous work and scientific contributions. In 3D, contributions are made to approach this objective, particularly by controlling the boundary valences of hexahedral meshes produced from frame fields. The different parts of the thesis address the steps of large deformation numerical simulations, the advantages of global parameterization methods, the results of simulations on industrial 2D meshes, and contributions to improving the flexibility and robustness of the hexahedral meshing process.The ultimate goal is to reduce the time spent by engineers in generating an adequate mesh for a simulation by considering a priori information on the deformation to which the mesh and the object will be subjected
Duraffourg, Elodie. "Commande non linéaire en présence de modes souples, applications aérospatiales". Thesis, Toulouse, ISAE, 2014. http://www.theses.fr/2014ESAE0048/document.
Due to mass constraints aerospace systems tend to have lightweight and flexible structures leading to new control objectives such as structural load reduction. To fulfil these objectives, flexible modes must be considered from the design of the controller, requiring to consider some constraints such as nonlinearities, underactuation, or measurement corruption terms. Consider these constraints, this thesis treats the design of a nonlinear control method for flexible aerospace systems. We particularly focus on the problem of reducing oscillations caused by the bending modes. To do that, we define a class of nonlinear system which is both underactuated and minimum phase and that represents flexible aerospace systems. Consider this class, we propose a nonlinear full-state controller based on changes of coordinates and the backstepping technique. The control design is carried out to enhance the transient of the flexible modes. Flexiblestates being not measured, the output-feedback problem is also treated through adaptive observers (finite-time and asymptotic). Uncertainties of natural damping and frequency of the bending modes are particularly considered. The proposed method is illustrated by numerical simulations performed on a space launch vehicle and an hypersonic aircraft
Gnanga, Honoré. "Analyse numérique d'écoulements turbulents anisotropes à l'aide de modèles non-linéaires de turbulence". Thesis, Lille 1, 2008. http://www.theses.fr/2008LIL10057/document.
The aim of this work is to predict numerically the three - dimensional turbulent flows of a Newtonian and incompressible fluid using nonlinear stress - strain models. The Explicit Algebraic Stress Models (EASM), which can take into account the anisotropy of turbulence with less CPU time and computer memory than RSM or approach DNS and LES, are adopted as a turbulence model. Among these models, we choosed Shih et al. (1995) and Craft et a1.(1996) models. These models are studied using a priori and a posteriori investigations. The study is carried out in square duct. This configuration presents a secondary flow and a significant anisotropy between the Reynolds stress components. To predict the significant viscous effects due to the wall and the corner, the damping functions are implemented. The maps of the second and third invariants in the plan of Lumley exhibited show the various states of turbulence and a good anisotropy level obtained. The mean flow field and the turbulent statistics are compared with existing numerical and experimental data for square and rectangular duct flow. The model performance is shown to be satisfactory. ln particular, the mean secondary velocity vectors and stream wise vorticity are well predicted
Yahyaoui, Omar El. "Évaluation de modèles non-linéaires de turbulence à partir de simulations numériques directes des équations de Navier-Stokes". Lille 1, 2003. https://ori-nuxeo.univ-lille1.fr/nuxeo/site/esupversions/b805d85e-4438-419e-b3c7-3b4549924063.