Download or read book Contribution l tude du comportement thermique des composants lectroniques written by Sébastien Vintrou and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce travail traite des aspects thermiques dans les composants électroniques, en particulier ceux de composants qui peuvent être thermiquement assimilés à des sources de chaleur localisées sur des milieux solides diffusifs. Dans une première partie, un modèle analytique général d'impédance thermique est développé. Il permet de calculer les températures de jonction de composants électroniques multidoigts sur des supports multicouches. Le modèle est basé sur la résolution tridimensionnelle de l'équation de la chaleur en régime fréquentiel par la méthode des transformées intégrales. Il a été utilisé pour évaluer l'influence des différents paramètres géométriques et structuraux du problème physique. Sa simplicité et la rapidité des temps de calculs en font un outil parfaitement adapté à la simulation des circuits électroniques.La seconde partie de ce travail est consacrée à la reconstitution spatiotemporelle des sources de chaleur par méthode inverse. Pour atteindre l'objectif, la méthode numérique des volumes finis a été programmée, afin d'exprimer sous la forme d'une représentation d'état, le problème en trois dimensions et en régime transitoire du phénomène de transfert de chaleur par conduction. La densité de flux a été discrétisée dans l'espace et le temps. Elle est estimée par la pseudo-inversion de la représentation d'état. Des tests numériques et un dispositif expérimental ont permis de valider la méthode.

Download or read book Contribution a l etude thermique et au dimensionnement des composants magnetiques pour l electronique de puissance written by Yves Patin and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Contribution l tude des transferts thermiques dans des syst mes complexes written by Philippe Angot and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: L'ETUDE CONCERNE LA MODELISATION DE PHENOMENES DE TRANSFERT DANS DES SYSTEMES PHYSIQUES COMPLEXES. ON PROPOSE LE CONCEPT D'"ARCHITECTURE GRAPHIQUE DE CALCUL", BASE SUR UNE APPROCHE ORIGINALE EN MATIERE DE MODPELISATION NUMERIQUE, ET QUI DEBOUCHE SUR LA CONCEPTION ET LE DEVELOPPEMENT D'UN LOGICIEL D'INGENIERIE SCIENTIFIQUE, THANES. ON DEVELOPPE AINSI UNE FORMULATION MATHEMATIQUE QUI PERMET L'EXPRESSION DIRECTE, DES CONDITIONS AUX LIMITES TRADITIONNELLES OU DES ECHANGES LATERAUX. LES PREMIERS RESULTATS PORTENT SUR LES COMPOSANTS ELECTRONIQUES, LES MATERIAUX COMPOSITES, LES MILIEUX POREUX HETEROGENES, AINSI QUE SUR DES TRAVAUX D'"HOMOGENEISATION NUMERIQUE" DANS DES MILIEUX PERIODIQUES. DES TRAVAUX EXPERIMENTAUX ONT ETE MENES SUR LA CARACTERISATION THERMIQUE DE COMPOSANTS ELECTRONIQUES: MESURES DE RESISTANCE THERMIQUE, ET APPLICATION DE LA THERMOGRAPHIE INFRA-ROUGE (PAR LA METHODE DE CORRECTION D'EMISSIVITE) A L'ANALYSE DE DEFAILLANCE

Download or read book CONTRIBUTION A LA MODELISATION NUMERIQUE ET A L ETUDE EXPERIMENTALE DU CHAMP THERMIQUE STATIONNAIRE 3D AU SEIN D UN MICROCOMPOSANT ELECTRONIQUE written by Philippe Poinas and published by . This book was released on 1987 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: ETUDE DE LA FIABILITE D'UN COMPOSANT ELECTRONIQUE PAR UNE SIMULATION THERMIQUE TRIDIMENSIONNELLE EN SITUATION REELLE. ELLE EST BASEE SUR UNE MODELISATION NUMERIQUE. LA CONCORDANCE ENTRE LES TEMPERATURES THEORIQUES ET EXPERIMENTALES SE REVELE TRES SATISFAISANTE

Download or read book CONTRIBUTION A L ETUDE DES TRANSFERTS COUPLES CONDUCTION RAYONNEMENT APPLICATION AUX PROTECTIONS THERMIQUES written by Jean-François Henry and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: LE PRESENT TRAVAIL CONTRIBUE A L'ETUDE DES TRANSFERTS COUPLES CONDUCTION-RAYONNEMENT DANS LES MILIEUX SEMI-TRANSPARENTS (MST). L'EQUATION DE TRANSFERT RADIATIF DANS UN ISOLANT FIBREUX EST RESOLUE A L'AIDE D'UN MODELE A DEUX FLUX DANS LE CADRE D'UN MUR UNIDIMENSIONNEL A PAROIS OPAQUES, NON GRIS ET DIFFUSANT. LA SOURCE RADIATIVE AINSI CALCULEE EST INCLUSE DANS UN MODELE AUX DIFFERENCES FINIES QUI PERMET DE RESOUDRE L'EQUATION DE LA CHALEUR, EN REGIME PERMANENT OU INSTATIONNAIRE, DANS LE CAS D'UN MATERIAU DONT LES PROPRIETES THERMOPHYSIQUES VARIENT AVEC LA TEMPERATURE. DEUX DISPOSITIFS EXPERIMENTAUX, ADAPTES A UN SPECTROMETRE INFRAROUGE COMMERCIAL, ONT ETE REALISES EN VUE DE MESURER, D'UNE PART LA REFLECTIVITE DIRECTIONNELLE NORMALE DE MATERIAUX OPAQUES, PLANS ET LISSES DANS UNE GAMME DE TEMPERATURE ALLANT DE 20 A 1000#OC, D'AUTRE PART LA TRANSMITTIVITE DIRECTIONNELLE DE MST ENTRE L'AMBIANTE ET 600#OC. EN OUTRE, UN TROISIEME DISPOSITIF PERMET LA MESURE DES TRANSMITTIVITES ET REFLECTIVITES BIDIRECTIONNELLES DE MST DIFFUSANTS DANS LE DOMAINE SPECTRAL SITUE ENTRE 2 ET 10 MICROMETRES. L'ANALYSE DES RESULTATS EXPERIMENTAUX PERMET D'EVALUER LES PARAMETRES RADIATIFS DES CONSTITUANTS D'UNE PROTECTION THERMIQUE MULTI-ECRANS. LES MODELES NUMERIQUES SIMULENT LE COMPORTEMENT D'UNE CELLULE DE BASE DE CETTE STRUCTURE EN REGIME TRANSITOIRE ET EN REGIME PERMANENT, AFIN D'EN CALCULER LA CONDUCTIVITE THERMIQUE EQUIVALENTE EN FONCTION DE LA TEMPERATURE. LES VALEURS OBTENUES EN BON ACCORD AVEC LES DONNEES EXPERIMENTALES RELATIVES AUX PROTECTIONS THERMIQUES EXISTANTES, PEUVENT ETRE UTILISEES POUR SIMULER LE COMPORTEMENT THERMIQUE D'UNE STRUCTURE MULTI-ECRANS

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1991-10 with total page 824 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ICREEC 2019 written by Ahmed Belasri and published by Springer Nature. This book was released on 2020-06-10 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.

Download or read book Government Reports Annual Index written by and published by . This book was released on 1991 with total page 1128 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book System Dynamics written by Dean C. Karnopp and published by Wiley-Interscience. This book was released on 2000 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt: The standard in the field, updated and revised for today's complex mechatronic systems More than ever before, engineers are responsible for the total system design of the products they create. While traditional modeling and simulation methods are useful in the design of static components, they are of little assistance to those charged with designing mechatronic systems comprising a variety of technologies and energy domains. Engineers who design such complex systems need more sophisticated tools to help them think and visualize on a dynamic systems level. This book arms them with one of the most important of those tools-bond graph modeling, a powerful unified graphic modeling language. System Dynamics, Third Edition is the only comprehensive guide to modeling, designing, simulating, and analyzing dynamic systems comprising any number of electrical, mechanical, hydraulic, pneumatic, thermal, and magnetic subsystems. While it has been updated and expanded to include many new illustrations, expanded coverage of computer simulation models, and more detailed information on dynamic system analysis, it has lost none of the qualities that have helped make it the standard text/reference in the field worldwide. With the help of more than 400 illustrations, the authors demonstrate step by step how to: * Model a wide range of mechatronic systems using bond graphs * Experiment with subsystem models to verify or disprove modeling decisions * Extract system characteristics and predict system behaviors * Translate graphical models into complex mathematical simulations * Combine bond graph modeling with state-of-the-art software simulation tools System Dynamics, Third Edition is an indispensable resource for practicing engineers as well as students of mechanical, electrical, aeronautical, and chemical engineering.

Download or read book Acta IMEKO 1967 written by and published by . This book was released on 1968 with total page 738 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book L Industrie C ramique written by and published by . This book was released on 1962 with total page 792 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bulletin de documentation, nos. 96-172, included in 1964-1970 volumes.

Download or read book Acta IMEKO written by International Measurement Congress and published by . This book was released on 1967 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings written by and published by . This book was released on 1968 with total page 730 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Terra 2008 written by Leslie Rainer and published by Getty Publications. This book was released on 2011-06-14 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earthen architecture constitutes one of the most diverse forms of cultural heritage and one of the most challenging to preserve. It dates from all periods and is found on all continents but is particularly prevalent in Africa, where it has been a building tradition for centuries. Sites range from ancestral cities in Mali to the palaces of Abomey in Benin, from monuments and mosques in Iran and Buddhist temples on the Silk Road to Spanish missions in California. This volume's sixty-four papers address such themes as earthen architecture in Mali, the conservation of living sites, local knowledge systems and intangible aspects, seismic and other natural forces, the conservation and management of archaeological sites, research advances, and training.

Download or read book Power Electronics Semiconductor Devices written by Robert Perret and published by John Wiley & Sons. This book was released on 2013-03-01 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book relates the recent developments in several key electrical engineering R&D labs, concentrating on power electronics switches and their use. The first sections deal with key power electronics technologies, MOSFETs and IGBTs, including series and parallel associations. The next section examines silicon carbide and its potentiality for power electronics applications and its present limitations. Then, a dedicated section presents the capacitors, key passive components in power electronics, followed by a modeling method allowing the stray inductances computation, necessary for the precise simulation of switching waveforms. Thermal behavior associated with power switches follows, and the last part proposes some interesting prospectives associated to Power Electronics integration.

Download or read book Bulletin de L Institut International Du Froid written by International Institute of Refrigeration and published by . This book was released on 1990 with total page 888 pages. Available in PDF, EPUB and Kindle. Book excerpt: Some numbers called Special issue and consist of summaries of papers to be presented at the International Congresses of Refrigeration.

Download or read book Basic Concepts for Simple and Complex Liquids written by Jean-Louis Barrat and published by Cambridge University Press. This book was released on 2003-03-27 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presenting a unified approach, this book focusses on the concepts and theoretical methods that are necessary for an understanding of the physics and chemistry of the fluid state. The authors do not attempt to cover the whole field in an encyclopedic manner. Instead, important ideas are presented in a concise and rigorous style, and illustrated with examples from both simple molecular liquids and more complex soft condensed matter systems such as polymers, colloids, and liquid crystals.