Contribution au diagnostic des défauts par approche multi-modèle PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Contribution au diagnostic des défauts par approche multi-modèle PDF full book. Access full book title Contribution au diagnostic des défauts par approche multi-modèle by Abid Aicha. Download full books in PDF and EPUB format.
Author: Abid Aicha
Publisher: Presses Academiques Francophones
ISBN: 9783841633705
Category :
Languages : fr
Pages : 152
Get Book Here
Book Description
Ce travail s'interesse a la modelisation, a la detection et a la localisation des defauts des machines asynchrones fondees sur l'approche multi-modele. Etant une phase cruciale dans l'application des algorithmes de diagnostic, la modelisation de la machine asynchrone est proposee. Deux modeles mathematiques ont ete developpes: un modele classique, triphase et un biphase. Afin de surmonter les limites de ces modeles, un multimodele est concu. Celuici est le produit de quatre etapes consecutives qui sont: l'acquisition d'une base de donnees, la classification des donnees en des groupes, l'identification parametrique et structurelle des differents sous modeles, et finalement, la fusion de ces sous modeles pour la formation du multimodele. Une etude comparative entre trois methodes de modelisation a base de trois algorithmes de classification a ete realisee. Cette etude a permis de creer une nouvelle strategie de classification. L'application de l'approche multi-modele basee sur la nouvelle strategie de classification au diagnostic requiert la conception de deux types de multiobservateurs qui sont proposes et valides experimentalement a la machine asynchrone."
Author: Abid Aicha
Publisher: Presses Academiques Francophones
ISBN: 9783841633705
Category :
Languages : fr
Pages : 152
Get Book Here
Book Description
Ce travail s'interesse a la modelisation, a la detection et a la localisation des defauts des machines asynchrones fondees sur l'approche multi-modele. Etant une phase cruciale dans l'application des algorithmes de diagnostic, la modelisation de la machine asynchrone est proposee. Deux modeles mathematiques ont ete developpes: un modele classique, triphase et un biphase. Afin de surmonter les limites de ces modeles, un multimodele est concu. Celuici est le produit de quatre etapes consecutives qui sont: l'acquisition d'une base de donnees, la classification des donnees en des groupes, l'identification parametrique et structurelle des differents sous modeles, et finalement, la fusion de ces sous modeles pour la formation du multimodele. Une etude comparative entre trois methodes de modelisation a base de trois algorithmes de classification a ete realisee. Cette etude a permis de creer une nouvelle strategie de classification. L'application de l'approche multi-modele basee sur la nouvelle strategie de classification au diagnostic requiert la conception de deux types de multiobservateurs qui sont proposes et valides experimentalement a la machine asynchrone."
Author: Dominique Sauter
Publisher:
ISBN:
Category :
Languages : fr
Pages :
Get Book Here
Book Description
LE TRAVAIL PRESENTE DANS CE MEMOIRE REPRESENTE UNE CONTRIBUTION A L'ETUDE DES METHODES DE DETECTION DE RUPTURE DE MODELE ET A LEURS APPLICATIONS A LA DETECTION D'EVENEMENTS DANS LES SIGNAUX ET AU DIAGNOSTIC DE SYSTEMES. POUR METTRE EN EVIDENCE LES VARIATIONS QUI EXISTENT ENTRE LES DEUX APPLICATIONS LE MEMOIRE EST VOLONTAIREMENT ORGANISE EN DEUX PARTIES. LA PREMIERE PARTIE EST CONSACREE A LA DETECTION DE RUPTURE DE MODELE DANS LES SIGNAUX. LE PROBLEME EST TRADUIT EN TERME DE TEST D'HYPOTHESES APPLIQUE AUX RESIDUS ISSUS DE LA COMPARAISON MODELE-SIGNAL. APRES UNE ANALYSE DES TRAVAUX DANS CE DOMAINE, UN MODELE DE COMPORTEMENT SIMPLIFIE EST TOUT D'ABORD CONSIDERE POUR LA DETECTION ET LA RECONNAISSANCE D'EVENEMENTS. CELUI-CI EST ENSUITE APPLIQUE A L'AMELIORATION DES PERFORMANCES D'UN CAPTEUR A COURANTS DE FOUCAULT. CE MODELE NE PERMET CEPENDANT PAS DE DETECTER DES CHANGEMENTS DE CARACTERISTIQUES SPECTRALES ET NOUS PROPOSONS DE RECOURIR A UN MODELE PLUS COMPLET, CELUI DE PROCESSUS AUTOREGRESSIFS, QUI EST APPLIQUE A LA RESOLUTION DE PROBLEMES BIOMEDICAUX. LA DEUXIEME PARTIE DU MEMOIRE TRAITE DE DEFAUTS DE SYSTEMES. LE PRINCIPE DES METHODES DE DETECTION QUI SONT PRESENTEES EST BASE SUR UNE ANALYSE DE L'ECART MODELE-FONCTIONNEMENT COURANT ET PRIVILEGIE LA NOTION DE REDONDANCE ANALYTIQUE. ON DISTINGUE DEUX CLASSES DE METHODES QUI FONT APPEL RESPECTIVEMENT A L'ESTIMATION D'ETAT ET A L'ESTIMATION PARAMETRIQUE. LA PREMIERE RETIENT NOTRE ATTENTION ET EST APPLIQUEE AU DIAGNOSTIC D'UN PROCESSUS THERMIQUE. ON S'INTERESSE ENSUITE AU PROBLEME DE ROBUSTESSE DES METHODES DE DIAGNOSTIC VIS-A-VIS DES INCERTITUDES OU VARIATIONS DE PARAMETRES DU SYSTEME ETUDIE. APRES UNE PRESENTATION DES TECHNIQUES EXISTANTES ON PROPOSE, POUR RESOUDRE CE PROBLEME, UNE NOUVELLE METHODOLOGIE CONSISTANT A ENGENDRER DES RESIDUS QUI S'ADAPTENT AUX VARIATIONS DE PARAMETRES.
Author: Gérard Dreyfus
Publisher: Springer Science & Business Media
ISBN: 3540288473
Category : Science
Languages : en
Pages : 509
Get Book Here
Book Description
Neural networks represent a powerful data processing technique that has reached maturity and broad application. When clearly understood and appropriately used, they are a mandatory component in the toolbox of any engineer who wants make the best use of the available data, in order to build models, make predictions, mine data, recognize shapes or signals, etc. Ranging from theoretical foundations to real-life applications, this book is intended to provide engineers and researchers with clear methodologies for taking advantage of neural networks in industrial, financial or banking applications, many instances of which are presented in the book. For the benefit of readers wishing to gain deeper knowledge of the topics, the book features appendices that provide theoretical details for greater insight, and algorithmic details for efficient programming and implementation. The chapters have been written by experts and edited to present a coherent and comprehensive, yet not redundant, practically oriented introduction.
Author: L.H. Chiang
Publisher: Springer Science & Business Media
ISBN: 1447103475
Category : Technology & Engineering
Languages : en
Pages : 281
Get Book Here
Book Description
Early and accurate fault detection and diagnosis for modern chemical plants can minimize downtime, increase the safety of plant operations, and reduce manufacturing costs. This book presents the theoretical background and practical techniques for data-driven process monitoring. It demonstrates the application of all the data-driven process monitoring techniques to the Tennessee Eastman plant simulator, and looks at the strengths and weaknesses of each approach in detail. A plant simulator and problems allow readers to apply process monitoring techniques.
Author: Kadry, Seifedine
Publisher: IGI Global
ISBN: 146662096X
Category : Technology & Engineering
Languages : en
Pages : 461
Get Book Here
Book Description
Industrial Prognostics predicts an industrial systems lifespan using probability measurements to determine the way a machine operates. Prognostics are essential in determining being able to predict and stop failures before they occur. Therefore the development of dependable prognostic procedures for engineering systems is important to increase the systems performance and reliability. Diagnostics and Prognostics of Engineering Systems: Methods and Techniques provides widespread coverage and discussions on the methods and techniques of diagnosis and prognosis systems. Including practical examples to display the methods effectiveness in real-world applications as well as the latest trends and research, this reference source aims to introduce fundamental theory and practice for system diagnosis and prognosis.
Author: Baoping Cai
Publisher: World Scientific
ISBN: 9813271507
Category : Mathematics
Languages : en
Pages : 418
Get Book Here
Book Description
Fault diagnosis is useful for technicians to detect, isolate, identify faults, and troubleshoot. Bayesian network (BN) is a probabilistic graphical model that effectively deals with various uncertainty problems. This model is increasingly utilized in fault diagnosis.This unique compendium presents bibliographical review on the use of BNs in fault diagnosis in the last decades with focus on engineering systems. Subsequently, eleven important issues in BN-based fault diagnosis methodology, such as BN structure modeling, BN parameter modeling, BN inference, fault identification, validation, and verification are discussed in various cases.Researchers, professionals, academics and graduate students will better understand the theory and application, and benefit those who are keen to develop real BN-based fault diagnosis system.
Author: Janos Gertler
Publisher: Routledge
ISBN: 1351448781
Category : Technology & Engineering
Languages : en
Pages : 512
Get Book Here
Book Description
Featuring a model-based approach to fault detection and diagnosis in engineering systems, this book contains up-to-date, practical information on preventing product deterioration, performance degradation and major machinery damage.;College or university bookstores may order five or more copies at a special student price. Price is available upon request.
Author: Kai Goebel
Publisher: Createspace Independent Publishing Platform
ISBN: 9781539074830
Category : Engineering systems
Languages : en
Pages : 396
Get Book Here
Book Description
Prognostics is the science of making predictions of engineering systems. It is part of a suite of techniques that determine whether a system is behaving within nominal operational performance and - if it does not - that determine what is wrong and how long it will take until the system no longer fulfills certain functional requirements. This book presents the latest developments and research findings on the topic of prognostics by the Prognostics Center of Excellence at NASA Ames Research Center. The book is intended to provide a practitioner with an understanding of the foundational concepts as well as practical tools to perform prognostics and health management on different types of engineering systems and in particular to predict remaining useful life.
Author: Nishant Gupta
Publisher: Springer Nature
ISBN: 3030633659
Category : Medical
Languages : en
Pages : 384
Get Book Here
Book Description
This book is a comprehensive reference on diffuse cystic lung diseases (DCLDs). DCLDs are a group of pathophysiologically heterogenous processes that are characterized by the presence of multiple spherical or irregularly shaped, thin-walled, air-filled spaces within the pulmonary parenchyma. In recent years, tremendous advancements have been made in these diseases leading to improved understanding of the underlying pathophysiology, and improved outcomes with targeted therapies. The authors, who are leading experts in the field, delineate DCLDs as a separate category distinct from other interstitial lung diseases, and have created this textbook specifically dedicated to this disease group. This book begins with a chapter introducing the definition and classification of DCLDs. Subsequent chapters address the pathogenic mechanisms underlying pulmonary cyst formation and provide a detailed overview of the radiological and pathological features of DCLDs. The common as well as uncommon causes of DCLDs are comprehensively reviewed in individual chapters, as are the varied clinical presentations and extrapulmonary manifestations, and approaches to management and treatment. The book culminates in a final chapter that presents a practical algorithmic approach to diagnosis that progresses from least invasive to most invasive approaches. This textbook provides a one-stop, comprehensive and integrated, clinical, radiologic, and pathologic overview of DCLDs that will be as useful to the practicing clinician as it is to the clinical investigator.
Author: B.S. Dhillon
Publisher: CRC Press
ISBN: 9781420050141
Category : Technology & Engineering
Languages : en
Pages : 416
Get Book Here
Book Description
As engineering systems become more and more complex, industry has recognized the importance of system and product reliability and places ever increasing emphasis on it during the design phase. Despite its efforts, however, industry continues to lose billions of dollars each year because of unexpected system failures. Therefore, it becomes increasingly important for designers and engineers to have a solid grounding in reliability engineering and keep abreast of new developments and research results.
