Download or read book Optimisation et adaptation de maillages tridimensionnels written by Christophe Gaillet and published by . This book was released on 1994 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Methode variationnelle d optimisation et d adaptation de maillages structures tridimensionnels written by Jean Cabello and published by . This book was released on 1990 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book M thode variationnelle d optimisation et d adaptation de maillages structur s tridimensionnels written by JEAN.. CABELLO and published by . This book was released on 1990 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: DANS CETTE THESE, NOUS PRESENTONS LES DEVELOPPEMENTS RECENTS D'UNE NOUVELLE METHODE VARIATIONNELLE, INTRODUITE PAR JACQUOTTE, POUR L'OPTIMISATION ET L'ADAPTATION DE MAILLAGES STRUCTURES BI- ET TRI-DIMENSIONNELS. LES DIFFERENTES TECHNIQUES DE GENERATION DE MAILLAGES STRUCTURES SONT RAPPELEES. LES AVANTAGES ET LES INCONVENIENTS INHERENTS A CHAQUE METHODE SONT DEGAGES. NOUS RAPPELONS LES PRINCIPALES ETAPES DE LA CONSTRUCTION DE LA METHODE VARIATIONNELLE PROPOSEE. L'APPROCHE PRESENTEE EST BASEE SUR LES PRINCIPES DE LA MECANIQUE DES MILIEUX CONTINUS. LE CADRE THEORIQUE S'INSPIRE CELUI DE L'ELASTICITE TRIDIMENSIONNELLE NON LINEAIRE. A PARTIR D'AXIOMES GEOMETRIQUES SIMPLES, REPOSANT SUR DES PROPRIETES MECANIQUES, NOUS INTRODUISONS DES FONCTIONNELLES QUI NE SONT PAS DEFINIES EN TERME DE REGULARITE, ORTHOGONALITE ET VARIATION CONTINUE DES VOLUMES, MAIS EN TERME DE MESURE DE LA DEFORMATION ENTRE UNE CELLULE DE REFERENCE ET UNE MAILLE COURANTE. CES FONCTIONNELLES DEPENDENT DES INVARIANTS PRINCIPAUX DE LA MATRICE DES DEFORMATIONS (TENSEUR METRIQUE) ASSOCIEE A LA TRANSFORMATION ENTRE LES DEUX CELLULES. L'OPTIMISATION DU MAILLAGE CONDUIT A UN PROBLEME DE MINIMISATION DE L'ENERGIE DE DEFORMATION D'UN MATERIAU HYPERELASTIQUE, QUASI-INCOMPRESSIBLE. ON IMPOSE UNE PROPRIETE DE CONVEXITE A LA FONCTIONNELLE; ALORS, LE PROBLEME DE MINIMISATION EST BIEN POSE. LA MINIMISATION SERA EFFECTUEE PAR UNE METHODE DE GRADIENT CONJUGUE. NOUS TERMINONS EN PRESENTANT LES RESULTATS NUMERIQUES OBTENUS, EN TRIDIMENSIONNEL. CES TESTS MONTRENT LA ROBUSTESSE ET L'EFFICACITE DE LA METHODE
Download or read book Applications of Mesh Generation to Complex 3 D Configurations written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Fluid Dynamics Panel. Specialists' Meeting and published by . This book was released on 1990 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: The AGARD Fluid Dynamics Panel sponsored this Symposium to provide a survey of the capabilities of the CFD community for griding complex 3-D configurations. The intent was to provide some insight to the present state of grid generation for complex configurations to help assess whether this task presents a long-term stumbling block to the routine use of CFD in aerodynamic applications. To this end, the meeting was structured in five sessions: General Surveys, Algebraic Grid Generation, Block Structured Meshes, Multiblock-Adaptive Meshes and Unstructured Meshes. Thwenty-two papers from these sessions amply gemonstrated that the viability of a numerical solution depends directly on the quality of the mesh and surface representation as measured by its spacing and resolution. Of Particular interest was the mesh generation for complex configurations, such as advanced fighter or transport aircraft, missiles and space vehicles, where complex geometries and/or complex flowfields have to be analysed. Results from this meeting indicate that geometry discretization and generation of meshes for complex 3-D configurations in aerospace will continue to be time- and cost-consuming operations fro some time to come.
Download or read book Pr optimisation de maillages automatiques tridimensionnels pour les m thodes num riques written by Jean-Christophe Cuillière and published by . This book was released on 1993 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le travail présenté ici s'inscrit dans le cadre de l'évolution des systèmes de CAO/CFAO vers une meilleure intégration des différentes fonctions mises en œuvre lors du processus de conception et de fabrication d'une pièce mécanique (ingénierie simultanée). Nous formulons ici, après avoir montré l'insuffisance des systèmes actuels, une approche de résolution du maillage automatique tridimensionnel proposant une pré-optimisation basée sur l'évaluation à priori d'un modèle dual de l'objet (CSG - Brep Exact) de manière à identifier directement et automatiquement les caractéristiques de forme pouvant être à la source de gradients de contraintes élevés. Cette approche permet également de réaliser l'intégration complète de la phase de calcul de comportement physique d'un objet au processus global de conception et de fabrication contribuant ainsi à concrétiser d'avantage le concept de l'ingénierie simultanée. Nous établissons les spécifications et la structure d'un système intégré de conception assistée par ordinateur ainsi qu'une stratégie de discrétisation basée sur les méthodes frontales permettant de rencontrer ces objectifs. L’ensemble de ces concepts fait ensuite l'objet d'une maquette de validation et nous présentons une série de résultats démontrant l'intérêt de notre approche
Download or read book Optimisation de maillages tridimensionnels written by Eric Brière de L'Isle and published by . This book was released on 1993 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Adaptation de maillages l ments finis volumiques et surfaciques partir d un calcul d erreur de discr tisation written by Marie-Hélène Colson and published by . This book was released on 1997 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce mémoire présente une procédure originale d'adaptation de maillage surfacique tridimensionnel s'appuyant sur la méthode DSI (Discrete Smooth Interpolation). L'originalité de la méthode réside dans le fait que les données se limitent à un simple maillage et ne font pas appel à la représentation CAO. Il est ainsi possible de créer de nouveaux noeuds à la surface en respectant les caractéristiques principales de la géométrie. L'association de cet outil à un logiciel de calcul des structures et à un mailleur volumique a permis de réaliser une boucle de calcul entièrement automatique dédiée à des problèmes tridimensionnels. Un exemple industriel illustre les performances et la souplesse de la méthode.
Download or read book Optimisation de maillages non structur s written by Laurence Moulard and published by . This book was released on 1994 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book AGARD Index of Publications written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development and published by . This book was released on 1989 with total page 526 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Adaptive Computational Methods in Mechanics written by P. Ladeveze and published by Elsevier. This book was released on 1998-06-23 with total page 539 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mastering modelling, and in particular numerical models, is becoming a crucial and central question in modern computational mechanics. Various tools, able to quantify the quality of a model with regard to another one taken as the reference, have been derived. Applied to computational strategies, these tools lead to new computational methods which are called "adaptive". The present book is concerned with outlining the state of the art and the latest advances in both these important areas.Papers are selected from a Workshop (Cachan 17-19 September 1997) which is the third of a series devoted to Error Estimators and Adaptivity in Computational Mechanics. The Cachan Workshop dealt with latest advances in adaptive computational methods in mechanics and their impacts on solving engineering problems. It was centered too on providing answers to simple questions such as: what is being used or can be used at present to solve engineering problems? What should be the state of art in the year 2000? What are the new questions involving error estimators and their applications?
Download or read book Recent Advances in Integrated Design and Manufacturing in Mechanical Engineering written by Grigore Gogu and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 541 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents recent advances in the integration and the optimization of product design and manufacturing systems. The book is divided into 3 chapters corresponding to the following three main topics : - optimization of product design process (mechanical design process, mass customization, modeling the product representation, computer support for engineering design, support systems for tolerancing, simulation and optimization tools for structures and for mechanisms and robots), -optimization of manufacturing systems (multi-criteria optimization and fuzzy volumes, tooth path generation, machine-tools behavior, surface integrity and precision, process simulation), - methodological aspects of integrated design and manufacturing (solid modeling, collaborative tools and knowledge formalization, integrating product and process design and innovation, robust and reliable design, multi-agent approach in VR environment). The present book is of interest to engineers, researchers, academic staff, and postgraduate students interested in integrated design and manufacturing in mechanical engineering.
Download or read book Mastering Calculations in Linear and Nonlinear Mechanics written by Pierre Ladevèze and published by Springer Science & Business Media. This book was released on 2004-12-16 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with the management of calculations in linear and nonlinear mechanics. Particular attention is given to error estimators and indicators for structural analysis. The accent is on the concept of error in constitutive relation. An important part of the work is also devoted to the utilization of the error estimators involved in a calculation, beginning with the parameters related to the mesh. Many of the topics are taken from the most recent research by the authors: local error estimators, extention of the concept of error in constitutive relation to nonlinear evolution problems and dynamic problems, adaptive improvement of calculations in nonlinear mechanics. This work is intended for all those interested in mechanics: students, researchers and engineers concerned with the construction of models as well as their simulation for industrial purposes.
Download or read book Integrated Design and Manufacturing in Mechanical Engineering written by Patrick Chedmail and published by Springer. This book was released on 2012-11-05 with total page 545 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the selected papers of the first I.D.M.M.E. conference on 'Integrated Design and Manufacturing in Mechanical Engineering', held in Nantes from 15-17 April 1996. Its objective was to discuss the questions related to the definition of the optimal design and manufacturing processes and to their integration through coherent methodologies in adapted environments. The initiative of the Conference and the organization thereof, is mainly due to the efforts of the french PRIMECA group (Pool of Computer Resources for Mechanics) started eight years ago. We were able to attract the internationru community with the support of the International Institution for Production Engineering Research (C.I.R.P.). The conference brought together two hundred and fifty specialists from around the world. About ninety papers and twenty posters were presented covering three main topics : optimization and evaluation of the product design process, optimization and evaluation of the manufacturing systems and methodological aspects.
Download or read book The Human Ear Canal written by Bopanna Ballachanda and published by Plural Publishing. This book was released on 2013-03-01 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Product Life Cycle Management written by Max Giordano and published by John Wiley & Sons. This book was released on 2012-12-17 with total page 389 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gives a comprehensive view of the most recent major international research in the field of tolerancing, and is an excellent resource for anyone interested in Computer Aided Tolerating. It is organized into 4 parts. Part 1 focuses on the more general problems of tolerance analysis and synthesis, for tolerancing in mechanical design and manufacturing processes. Part 2 specifically highlights the simulation of assembly with defects, and the influence of tolerances on the quality of the assembly. Part 3 deals with measurement aspects, and quality control throughout the life cycle. Different measurement technologies and methods for estimating uncertainty are considered. In Part 4, different aspects of tolerancing and their interactions are explored, from the definition of functional requirement to measurement processes in a PLM approach.
Download or read book Topics in Computational Wave Propagation written by Mark Ainsworth and published by Springer. This book was released on 2011-09-27 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: These ten detailed and authoritative survey articles on numerical methods for direct and inverse wave propagation problems are written by leading experts. Researchers and practitioners in computational wave propagation, from postgraduate level onwards, will find the breadth and depth of coverage of recent developments a valuable resource. The articles describe a wide range of topics on the application and analysis of methods for time and frequency domain PDE and boundary integral formulations of wave propagation problems. Electromagnetic, seismic and acoustic equations are considered. Recent developments in methods and analysis ranging from finite differences to hp-adaptive finite elements, including high-accuracy and fast methods are described with extensive references.
Download or read book Medical Image Computing and Computer Assisted Intervention MICCAI 2012 written by Nicholas Ayache and published by Springer. This book was released on 2012-08-28 with total page 645 pages. Available in PDF, EPUB and Kindle. Book excerpt: The three-volume set LNCS 7510, 7511, and 7512 constitutes the refereed proceedings of the 15th International Conference on Medical Image Computing and Computer-Assisted Intervention, MICCAI 2012, held in Nice, France, in October 2012. Based on rigorous peer reviews, the program committee carefully selected 252 revised papers from 781 submissions for presentation in three volumes. The third volume includes 79 papers organized in topical sections on diffusion imaging: from acquisition to tractography; image acquisition, segmentation and recognition; image registration; neuroimage analysis; analysis of microscopic and optical images; image segmentation; diffusion weighted imaging; computer-aided diagnosis and planning; and microscopic image analysis.
