Download or read book Mod lisation et commande avanc es d un moteur di sel injection directe written by Pierre Dupraz and published by . This book was released on 1998 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: CETTE THESE ABORDE LE PROBLEME GENERAL DE LA MODELISATION ET DE LA COMMANDE EN COUPLE D'UN MOTEUR DIESEL A INJECTION DIRECTE EQUIPE D'UN SYSTEME D'INJECTION DE TYPE COMMON RAIL. LE COUPLE FOURNI PAR LE MOTEUR N'ETANT PAS MESURE SUR UN VEHICULE DE SERIE, ON CHERCHE A L'ESTIMER A PARTIR DE LA VITESSE DE ROTATION INSTANTANEE, SANS CONNAITRE LE COUPLE RESISTANT. AU PREALABLE, UN TRAVAIL DE MODELISATION EST DONC NECESSAIRE. EN EFFET, LE SYSTEME D'INJECTION COMMON RAIL EST RELATIVEMENT RECENT ET OFFRE DE NOUVEAUX MODES DE FONCTIONNEMENT, COMME LA PRE-INJECTION OU LA POST-INJECTION. OR LES MODELES DE MOTEUR POUR LA COMMANDE DISPONIBLES DANS LA LITTERATURE NE SAVENT PAS DECRIRE CES TYPES DE FONCTIONNEMENT, NOTAMMENT LE DEGAGEMENT DE CHALEUR. ENSUITE, UNE STRATEGIE DE COMMANDE EST MISE AU POINT, QUI MESURE ET CORRIGE LES DIFFERENCES DE COUPLE CYLINDRE A CYLINDRE. LA CONSEQUENCE EST UNE REDUCTION DES VIBRATIONS DU MOTEUR. FINALEMENT, L'ESTIMATION DU COUPLE LUI-MEME EST ABORDEE. UN MODELE PARAMETRIQUE EST CONSTRUIT, ET PERMET DE FORMALISER UN CERTAIN NOMBRE DE CONNAISSANCES EMPIRIQUES ET D'OBTENIR UN PREMIER ESTIMATEUR. ON MONTRE QUE SA PRECISION EST RELATIVEMENT SENSIBLE AUX ERREURS DE MODELISATION ET AU BRUIT DE MESURE, CE QUI EN LIMITE L'APPLICABILITE A CE JOUR. DES VOIES D'AMELIORATIONS POSSIBLES SONT PROPOSEES, SOUS LA FORME D'UN CERTAIN NOMBRE D'AXES DE RECHERCHE FUTURS.
Download or read book Mod lisation du moteur allumage par compression dans la perspective du contr le et du diagnostic written by Olivier Grondin and published by . This book was released on 2004 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le travail de cette thèse a pour objet la modélisation du moteur à allumage par compression pour le contrôle et le diagnostic. Le moteur Diesel est le moteur à combustion interne le plus performant et l'un des plus propres grâce aux actionneurs modernes. Cependant, les normes anti-pollutions sont de plus en plus strictes et, aujourd’hui, la réduction des émissions nocives dépend en partie des stratégies de commande des actionneurs. C’est pourquoi, les modèles sont devenus indispensables à chaque étape du développement du contrôle moteur : synthèse des algorithmes de commande, simulation et validation. Le système considéré est un moteur Diesel six cylindres à injection directe équipé d’un turbocompresseur. Le modèle développé repose sur des lois physiques pour les cylindres, les collecteurs, le turbocompresseur et le vilebrequin. Des lois empiriques ont été choisies pour la modélisation de la combustion et des transferts thermiques afin de réduire le temps de simulation. Le modèle, programmé en langage C dans l’environnement Matlab-Simulink, est capable de prédire l’évolution des variables utiles au contrôle moteur au degré vilebrequin. Les résultats sont conformes à ceux obtenus à l’aide d’un code de calcul industriel et ils sont représentatifs des mesures réalisées sur le banc moteur expérimental. Le modèle a ensuite été implanté sur un calculateur puissant nous permettant de disposer d’un simulateur adapté aux applications temps réel. Une partie de cette étude a aussi été consacrée à la modélisation du processus de combustion à l’aide d’un modèle de représentation non linéaire : le modèle NARMAX. L’objectif est de construite un modèle capable de prédire l’évolution de la pression cylindre en exploitant d’autres mesures disponibles sur un moteur. Les coefficients du modèle NARMAX ont été identifiés directement à partir des mesures des entrées et des sorties du système. Ce type de modèle présente l’avantage d’être moins coûteux en terme de temps de calcul par rapport aux modèles physiques. Les résultats sont encourageants et montrent que l’utilisation du régime instantané comme variable d’entrée principale du modèle permet de reproduire l’allure de la pression cylindre dans le cas d’une combustion précoce.
Download or read book D finition et mise en oeuvre de lois de commande mod le interne pour un moteur thermique injection directe d essence written by Frédéric Grousson and published by . This book was released on 2000 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le travail présenté dans ce mémoire traite de l'amélioration du contrôle-moteur, pour un moteur thermique à injection directe, par utilisation de commandes à modèle interne. Cette étude est réalisée dans le but d'optimiser le fonctionnement du moteur et de diminuer ses émissions polluantes, notamment durant les phases transitoires. L'orientation vers des commandes à modèle interne s'explique par la nécessité d'une commande d'une part robuste pour faire face à la disparité des paramètres moteur, et d'autre part, facile à calibrer afin de diminuer le temps de mise au point. La première partie donne un aperçu du fonctionnement du moteur thermique et présente les éléments de modélisation en vue de la commande. La deuxième partie aborde la mise en place des algorithmes de régulation. Tout d'abord, la commande d'admission des gaz dans le cylindre utilise la théorie des couplages linéarisants associés à la commande prédictive. Ensuite, la commande en couple des ordres du conducteur est réalisée par une inversion statique utilisant la matrice jacobienne. Enfin, une commande prédictive simplifiée permet de résoudre les problèmes de régulation de ralenti et d'asservissement du régime moteur. Une dernière partie est consacrée aux tests "temps réel" et au prototypage rapide. La plupart des résultats de simulation sont ensuite validés par des essais expérimentaux sur un véhicule prototype.
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 Faecal Sludge Management written by Linda Strande and published by IWA Publishing. This book was released on 2014-08-15 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is estimated that literally billions of residents in urban and peri-urban areas of Africa, Asia, and Latin America are served by onsite sanitation systems (e.g. various types of latrines and septic tanks). Until recently, the management of faecal sludge from these onsite systems has been grossly neglected, partially as a result of them being considered temporary solutions until sewer-based systems could be implemented. However, the perception of onsite or decentralized sanitation technologies for urban areas is gradually changing, and is increasingly being considered as long-term, sustainable options in urban areas, especially in low- and middle-income countries that lack sewer infrastructures. This is the first book dedicated to faecal sludge management. It compiles the current state of knowledge of the rapidly evolving field of faecal sludge management, and presents an integrated approach that includes technology, management, and planning based on Sandecs 20 years of experience in the field. Faecal Sludge Management: Systems Approach for Implementation and Operation addresses the organization of the entire faecal sludge management service chain, from the collection and transport of sludge, and the current state of knowledge of treatment options, to the final end use or disposal of treated sludge. The book also presents important factors to consider when evaluating and upscaling new treatment technology options. The book is designed for undergraduate and graduate students, and engineers and practitioners in the field who have some basic knowledge of environmental and/or wastewater engineering.
Download or read book Management of Radioactive Wastes from the Nuclear Fuel Cycle written by and published by . This book was released on 1976 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Livestock Policy Analysis written by International Livestock Research Institute and published by ILRI (aka ILCA and ILRAD). This book was released on 1995-01-01 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: Policy concepts; Identification of policy issues; Production systems, supply and demand; Market, price and trade policies; Marketing and distribution systems; Budget and manpower planning; Land tenure police for the livestock sector; Policy analysis report writing and communication; Livestock production and marketing in alphabeta - a case study.
Download or read book Advances in Rotorcraft Technology written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Flight Vehicle Integration Panel. Symposium and published by . This book was released on 1997 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Routledge International Handbook of Ignorance Studies written by Matthias Gross and published by Routledge. This book was released on 2015-05-15 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: Once treated as the absence of knowledge, ignorance today has become a highly influential topic in its own right, commanding growing attention across the natural and social sciences where a wide range of scholars have begun to explore the social life and political issues involved in the distribution and strategic use of not knowing. The field is growing fast and this handbook reflects this interdisciplinary field of study by drawing contributions from economics, sociology, history, philosophy, cultural studies, anthropology, feminist studies, and related fields in order to serve as a seminal guide to the political, legal and social uses of ignorance in social and political life. Chapter 33 of this book is freely available as a downloadable Open Access PDF under a Creative Commons Attribution-Non Commercial-No Derivatives 4.0 license available here: https://tandfbis.s3-us-west-2.amazonaws.com/rt-files/docs/Open+Access+Chapters/9780415718967_oachapter33.pdf
Download or read book How to Design Wastewater Systems for Local Conditions in Developing Countries written by David M. Robbins and published by IWA Publishing. This book was released on 2014-03-15 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a practical handbook providing a step-by-step approach to the techniques used for characterizing wastewater sources and investigating sites where collection, treatment and reuse/disposal technologies will be installed. It is intended to help enable local implementation of on-site and decentralized wastewater management system (DWMS)for wide scale use in development settings. How to Design Wastewater Systems for Local Conditions in Developing Countries helps local service providers and regulatory officials make informed decisions through the use of tools, checklists and case studies. It includes a link to a web based community of on-site and decentralized wastewater professionals, which contains related tools and case studies. This handbook serves as a reference for training classes, certification programs, and higher education programs in civil and sanitary engineering. There is an increasing interest on the part of local government officials and private sector service providers to implement wastewater treatment systems to solve sanitation problems. The model presented in this handbook promotes activities that first generate data related to source and site conditions that represent critical inputs, and then applies this information to the technology selection process. Matching the most appropriate technologies to the specific needs of the wastewater project is the key that leads to long term sustainability. How to Design Wastewater Systems for Local Conditions in Developing Countries is an invaluable resource for public sector decision makers and private sector service providers in developing countries. It is also a useful text for students at engineering colleges in developing countries interested in taking a class that teaches the methods of decentralized wastewater management system (DWMS) development.
Download or read book The Polar Cusp written by J.A. Holtet and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings are based upon introductory talks, research reports and discussions from the NATO Advanced Workshop on the "Morphology and Dynamics of the Polar Cusp", held at Lillehammer, Norway, 7-12 May, 1984. The upper atmosphere at high latitudes is called the "Earth's win dow to outer space". Through various electrodynamic coupling process es as well as through direct transfer of particles many geophysical effects displayed there are direct manifestations of phenomena occurring in the deep space. The high latitude ionosphere will also exert a feedback on the regions of the magnetosphere and atmosphere to which it is coupled, acting as a momentum and energy source and sink, and a source of particles. Of particular interest are the sections of the near space known as the Polar Cusp. A vast portion of the earth's magnetic field envelope is electrically connected to these regions. This geometry results in a spatial mapping of the magnetospheric pro cesses and a focusing on to the ionosphere. In the Polar Cusps the solar wind plasma has also direct access to the upper atmosphere. The polar regions are thus of extreme importance when it comes to under standing the physical processes in the near space and their effect on our environment. The Introductory Talks given at this workshop provided a common background for discussing and understanding the physics of the Polar Cusp. By this book we will make the information which thus was provid ed to the participants of the workshop accessible to a wider audience.
Download or read book Element of Hope written by Charles Hayter and published by McGill-Queen's Press - MQUP. This book was released on 2005 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: A national study of the history of cancer in Canada.
Download or read book Vortex Dominated Flows written by Denis L. Blackmore and published by World Scientific. This book was released on 2005 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: Honoring the contributions of one of the field's leading experts, Lu Ting, this indispensable volume contains important new results at the cutting edge of research. A wide variety of significant new analytical and numerical results in critical areas are presented, including point vortex dynamics, superconductor vortices, cavity flows, vortex breakdown, shock/vortex interaction, wake flows, magneto-hydrodynamics, rotary wake flows, and hypersonic vortex phenomena.The book will be invaluable for those interested in the state of the art of vortex dominated flows, both from a theoretical and applied perspective.Professor Lu Ting and Joe Keller have worked together for over 40 years. In their first joint work entitled ?Periodic vibrations of systems governed by nonlinear partial differential equations?, perturbation analysis and bifurcation theory were used to determine the frequencies and modes of vibration of various physical systems. The novelty was the application to partial differential equations of methods which, previously, had been used almost exclusively on ordinary differential equations. Professsor Lu Ting is an expert in both fluid dynamics and the use of matched asymptotic expansions. His physical insight into fluid flows has led the way to finding the appropriate mathematical simplications used in the solutions to many difficult flow problems.
Download or read book Molecular Mechanisms of Hormone Action written by Gesellschaft für Biologische Chemie. Colloquium and published by . This book was released on 1989 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Instabilities in Multiphase Flows written by A. Berlemont and published by . This book was released on 2014-01-15 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Disposal of Radioactive Wastes Into the Ground written by and published by . This book was released on 1967 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Parallel Computing written by Barbara Chapman and published by IOS Press. This book was released on 2010 with total page 760 pages. Available in PDF, EPUB and Kindle. Book excerpt: From Multicores and GPUs to Petascale. Parallel computing technologies have brought dramatic changes to mainstream computing the majority of todays PCs, laptops and even notebooks incorporate multiprocessor chips with up to four processors. Standard components are increasingly combined with GPUs Graphics Processing Unit, originally designed for high-speed graphics processing, and FPGAs Free Programmable Gate Array to build parallel computers with a wide spectrum of high-speed processing functions. The scale of this powerful hardware is limited only by factors such as energy consumption and thermal control. However, in addition to"
