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Book Description
L'ETUDE PRESENTEE S'ARTICULE EN DEUX AXES PRINCIPAUX. LE PREMIER CONCERNE L'ETUDE DES ECOULEMENTS LIES AUX INSTABILITES DE FONCTIONNEMENT DES SYSTEMES HYDRAULIQUES. NOUS AVONS POUR CELA REALISE, AU SEIN DE L'EQUIPE ENSAM DU LABORATOIRE DE MECANIQUE DE LILLE, PLUSIEURS CAMPAGNES DE MESURES VISANT A DETERMINER LE COMPORTEMENT HYDROACOUSTIQUE PASSIF D'UNE POMPE CENTRIFUGE FONCTIONNANT EN EAU. LA MATRICE DE TRANSFERT EST ALORS CALCULEE EN REGIME PERMANENT POUR UN GRAND NOMBRE DE CONDITIONS DE FONCTIONNEMENT ET PERMET DE METTRE EN EVIDENCE L'INDEPENDANCE DES TERMES DE TRANSFERT VIS A VIS DE LA VITESSE DE ROTATION ET DU DEBIT LORSQUE L'ON SE SITUE ENTRE 40 ET 400 HZ. ON DEMONTRE FINALEMENT QUE L'IDENTIFICATION DES TERMES DE LA MATRICE DE TRANSFERT A PARTIR D'UN MODELE DE CONDUITE N'EST PAS SATISFAISANTE ET QU'IL EST NECESSAIRE DE DEVELOPPER DES MODELES PLUS ELABORES. LE SECOND AXE S'ATTACHE AU COMPORTEMENT DES POMPES CENTRIFUGES LORS DES DEMARRAGES RAPIDES. CES FONCTIONNEMENTS PARTICULIERS, POUR LESQUELS IL EXISTE PEU DE TRAVAUX, SONT PRINCIPALEMENT RENCONTRES DANS LE DOMAINE AEROSPATIAL. L'ETUDE DU DEVELOPPEMENT AXIAL ET RADIAL DE LA RECIRCULATION DANS LA CONDUITE D'ASPIRATION MONTRE QUE CETTE ZONE D'ECOULEMENT PARTICULIER DEPEND FORTEMENT DE LA VITESSE ET DU DEBIT ET QU'ELLE PRESENTE UN ASPECT INSTATIONNAIRE TRES MARQUE. UNE ANALYSE PAR SEPARATION DES PERTES PERMET EGALEMENT DE PROPOSER UN MODELE DE PERTES PAR RECIRCULATION. L'EXTRAPOLATION DE L'ENSEMBLE DE CES RESULTATS AU CAS D'UN DEMARRAGE RAPIDE PAR L'INTERMEDIAIRE D'ENREGISTREMENTS VIDEO PERMET, EN DERNIER LIEU, DE PROCEDER A LA REEVALUATION DU MODELE D'ECOULEMENT INSTATIONNAIRE DANS UNE POMPE CENTRIFUGE EN REGIME TRANSITOIRE PROPOSE PAR GHELICI. LES RESULTATS MONTRENT ALORS QUE LE TEMPS D'ETABLISSEMENT DE L'ECOULEMENT EST UNE DONNEE MAJEURE QU'IL EST NECESSAIRE D'ESTIMER SI L'ON SOUHAITE OBTENIR UN MODELE PREDICTIF.
Book Description
L'ETUDE PRESENTEE S'ARTICULE EN DEUX AXES PRINCIPAUX. LE PREMIER CONCERNE L'ETUDE DES ECOULEMENTS LIES AUX INSTABILITES DE FONCTIONNEMENT DES SYSTEMES HYDRAULIQUES. NOUS AVONS POUR CELA REALISE, AU SEIN DE L'EQUIPE ENSAM DU LABORATOIRE DE MECANIQUE DE LILLE, PLUSIEURS CAMPAGNES DE MESURES VISANT A DETERMINER LE COMPORTEMENT HYDROACOUSTIQUE PASSIF D'UNE POMPE CENTRIFUGE FONCTIONNANT EN EAU. LA MATRICE DE TRANSFERT EST ALORS CALCULEE EN REGIME PERMANENT POUR UN GRAND NOMBRE DE CONDITIONS DE FONCTIONNEMENT ET PERMET DE METTRE EN EVIDENCE L'INDEPENDANCE DES TERMES DE TRANSFERT VIS A VIS DE LA VITESSE DE ROTATION ET DU DEBIT LORSQUE L'ON SE SITUE ENTRE 40 ET 400 HZ. ON DEMONTRE FINALEMENT QUE L'IDENTIFICATION DES TERMES DE LA MATRICE DE TRANSFERT A PARTIR D'UN MODELE DE CONDUITE N'EST PAS SATISFAISANTE ET QU'IL EST NECESSAIRE DE DEVELOPPER DES MODELES PLUS ELABORES. LE SECOND AXE S'ATTACHE AU COMPORTEMENT DES POMPES CENTRIFUGES LORS DES DEMARRAGES RAPIDES. CES FONCTIONNEMENTS PARTICULIERS, POUR LESQUELS IL EXISTE PEU DE TRAVAUX, SONT PRINCIPALEMENT RENCONTRES DANS LE DOMAINE AEROSPATIAL. L'ETUDE DU DEVELOPPEMENT AXIAL ET RADIAL DE LA RECIRCULATION DANS LA CONDUITE D'ASPIRATION MONTRE QUE CETTE ZONE D'ECOULEMENT PARTICULIER DEPEND FORTEMENT DE LA VITESSE ET DU DEBIT ET QU'ELLE PRESENTE UN ASPECT INSTATIONNAIRE TRES MARQUE. UNE ANALYSE PAR SEPARATION DES PERTES PERMET EGALEMENT DE PROPOSER UN MODELE DE PERTES PAR RECIRCULATION. L'EXTRAPOLATION DE L'ENSEMBLE DE CES RESULTATS AU CAS D'UN DEMARRAGE RAPIDE PAR L'INTERMEDIAIRE D'ENREGISTREMENTS VIDEO PERMET, EN DERNIER LIEU, DE PROCEDER A LA REEVALUATION DU MODELE D'ECOULEMENT INSTATIONNAIRE DANS UNE POMPE CENTRIFUGE EN REGIME TRANSITOIRE PROPOSE PAR GHELICI. LES RESULTATS MONTRENT ALORS QUE LE TEMPS D'ETABLISSEMENT DE L'ECOULEMENT EST UNE DONNEE MAJEURE QU'IL EST NECESSAIRE D'ESTIMER SI L'ON SOUHAITE OBTENIR UN MODELE PREDICTIF.
Author: Philippe Gourbesville Publisher: Springer Nature ISBN: 9811554366 Category : Science Languages : en Pages : 1056
Book Description
This book features a collection of extended papers based on presentations given at the SimHydro 2019 conference, held in Sophia Antipolis in June 2019 with the support of French Hydrotechnic Society (SHF), focusing on “Which models for extreme situations and crisis management?” Hydraulics and related disciplines are frequently applied in extreme situations that need to be understood accurately before implementing actions and defining appropriate mitigation measures. However, in such situations currently used models may be partly irrelevant due to factors like the new physical phenomena involved, the scale of the processes, and the hypothesis included in the different numerical tools. The availability of computational resources and new capacities like GPU offers modellers the opportunity to explore various approaches to provide information for decision-makers. At the same time, the topic of crisis management has sparked interest from stakeholders who need to share a common understanding of a situation. Hydroinfomatics tools can provide essential information in crises; however, the design and integration of models in decision-support systems require further development and the engagement of various communities, such as first responders. In this context, methodologies, guidelines and standards are more and more in demand in order to ensure that the systems developed are efficient and sustainable. Exploring both the limitations and performance of current models, this book presents the latest developments based on new numerical schemes, high-performance computing, multiphysics and multiscale methods, as well as better integration of field-scale model data. As such, it will appeal to practitioners, stakeholders, researchers and engineers active in this field.
Author: Heiner Klinkrad Publisher: Springer Science & Business Media ISBN: 3540376747 Category : Technology & Engineering Languages : en Pages : 438
Book Description
The future evolution of the debris environment will be forecast on the basis of traffic models and possible hazard mitigation practices. The text shows how large trackable objects will have re-entry pinpointed and predictions made on related risk assessment for possible ground impact. Models will also be described for meteoroids which are also a prevailing risk.
Author: Philippe Gourbesville Publisher: Springer ISBN: 9811072183 Category : Science Languages : en Pages : 1205
Book Description
This book gathers a collection of extended papers based on presentations given during the SimHydro 2017 conference, held in Sophia Antipolis, Nice, France on June 14–16, 2017. It focuses on how to choose the right model in applied hydraulics and considers various aspects, including the modeling and simulation of fast hydraulic transients, 3D modeling, uncertainties and multiphase flows. The book explores both limitations and performance of current models and presents the latest developments in new numerical schemes, high-performance computing, multiphysics and multiscale methods, and better interaction with field or scale model data. It gathers the lastest theoretical and innovative developments in the modeling field and presents some of the most advance applications on various water related topics like uncertainties, flood simulation and complex hydraulic applications. Given its breadth of coverage, it addresses the needs and interests of practitioners, stakeholders, researchers and engineers alike.
Author: Rochdi Merzouki Publisher: Springer Science & Business Media ISBN: 144714628X Category : Technology & Engineering Languages : en Pages : 960
Book Description
Acting as a support resource for practitioners and professionals looking to advance their understanding of complex mechatronic systems, Intelligent Mechatronic Systems explains their design and recent developments from first principles to practical applications. Detailed descriptions of the mathematical models of complex mechatronic systems, developed from fundamental physical relationships, are built on to develop innovative solutions with particular emphasis on physical model-based control strategies. Following a concurrent engineering approach, supported by industrial case studies, and drawing on the practical experience of the authors, Intelligent Mechatronic Systems covers range of topic and includes: An explanation of a common graphical tool for integrated design and its uses from modeling and simulation to the control synthesis Introductions to key concepts such as different means of achieving fault tolerance, robust overwhelming control and force and impedance control Dedicated chapters for advanced topics such as multibody dynamics and micro-electromechanical systems, vehicle mechatronic systems, robot kinematics and dynamics, space robotics and intelligent transportation systems Detailed discussion of cooperative environments and reconfigurable systems Intelligent Mechatronic Systems provides control, electrical and mechanical engineers and researchers in industrial automation with a means to design practical, functional and safe intelligent systems.
Author: North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Propulsion and Energetics Panel. Symposium Publisher: ISBN: Category : Aircraft accidents Languages : en Pages : 344
Author: North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Propulsion and Energetics Panel. Symposium Publisher: ISBN: 9789283505945 Category : Aerodynamics, Hypersonic Languages : en Pages : 472
Author: STEPHANE.. BOLPAIRE
Author: STEPHANE.. BOLPAIRE
Author: Philippe Gourbesville
Author: 
Author: Heiner Klinkrad
Author: Philippe Gourbesville
Author: Rochdi Merzouki
Author: North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Propulsion and Energetics Panel. Symposium
Author: Von Karman Institute for Fluid Dynamics
Author: North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Propulsion and Energetics Panel. Symposium
Author: