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Author: FEYEL Philippe Publisher: Lavoisier ISBN: 2746295288 Category : Automatic control Languages : en Pages : 282
Book Description
L’approche loop-shaping consiste en l’obtention d’une spécification relative à la boucle ouverte de l’asservissement à partir de spécifications relatives à divers transferts en boucle fermée. Parce qu’il est plus simple de travailler sur un unique transfert (la boucle ouverte) plutôt que sur une multitude de transferts bouclés, cette approche s’avère particulièrement adaptée au contexte industriel. Cet ouvrage se concentre sur la déclinaison des spécifications de haut niveau vers une spécification de type loop-shaping, puis sur les techniques permettant d’intégrer pleinement cette démarche pour le calcul de correcteurs robustes et performants, en particulier par la synthèse H?. Modelage de la boucle ouverte escomptée, la synthèse H? par loop-shaping permet par ailleurs de stabiliser toute une boule de modèles grâce à la notion de gap métrique, ce qui s’avère particulièrement intéressant pour la prise en compte de contraintes industrielles. La volonté accrue de réaliser des asservissements à moindre coût et de plus en plus performants mène à l’optimisation de cette technique, la rendant indispensable à son domaine.
Author: FEYEL Philippe Publisher: Lavoisier ISBN: 2746295288 Category : Automatic control Languages : en Pages : 282
Book Description
L’approche loop-shaping consiste en l’obtention d’une spécification relative à la boucle ouverte de l’asservissement à partir de spécifications relatives à divers transferts en boucle fermée. Parce qu’il est plus simple de travailler sur un unique transfert (la boucle ouverte) plutôt que sur une multitude de transferts bouclés, cette approche s’avère particulièrement adaptée au contexte industriel. Cet ouvrage se concentre sur la déclinaison des spécifications de haut niveau vers une spécification de type loop-shaping, puis sur les techniques permettant d’intégrer pleinement cette démarche pour le calcul de correcteurs robustes et performants, en particulier par la synthèse H?. Modelage de la boucle ouverte escomptée, la synthèse H? par loop-shaping permet par ailleurs de stabiliser toute une boule de modèles grâce à la notion de gap métrique, ce qui s’avère particulièrement intéressant pour la prise en compte de contraintes industrielles. La volonté accrue de réaliser des asservissements à moindre coût et de plus en plus performants mène à l’optimisation de cette technique, la rendant indispensable à son domaine.
Author: Philippe Feyel Publisher: ISTE Group ISBN: 1784052639 Category : Error-correcting codes (Information theory) Languages : fr Pages : 432
Book Description
Dans l’industrie, l’automaticien doit concevoir une loi de commande unique pour satisfaire un cahier des charges complexe sur un grand nombre de systèmes. Pour cela, en fonction de son expérience, il emploie un processus itératif chronophage basé sur le réglage et l’expérimentation (ou la simulation). Il s’agit de la phase d’essai-erreur. Dans cet ouvrage, une méthodologie de synthèse des correcteurs des asservissements plus efficace et moins coûteuse est développée. Les problèmes de commande robuste sont reformulés pour l’optimisation stochastique à travers la synthèse des correcteurs structurés à partir de problématiques de type H?, ?-synthèse ou encore synthèse LPV. L’intérêt de l’approche formulée réside dans sa flexibilité et la prise en compte de contraintes « exotiques » complexes. Une méthode originale de synthèse de correcteurs structurés et robustes vis-à-vis d’exigences de haut niveau de forme quelconque est proposée sur la base d’algorithmes évolutionnaires très performants et compétitifs. Cette méthodologie donne lieu à la mise en oeuvre d’un outil numérique de synthèse de correcteur. La validation de ces travaux a été réalisée sur des problèmes industriels tels que celui de la stabilisation inertielle de ligne de visées.
Author: Dorothea Blostein Publisher: Springer ISBN: 9783662172940 Category : Computers Languages : en Pages : 370
Book Description
This book presents refereed and revised papers presented at GREC 2001, the 4th IAPR International Workshop on Graphics Recognition, which took place in Kingston, Ontario, Canada in September 2001. Graphics recognition is a branch of document image analysis that focuses on the recognition of two-dimensional notations such as engineering drawings, maps, mathematical notation, music notation, tables, and chemical structure diagrams. Due to the growing demand for both o?-line and on-line document recognition systems, the ?eld of graphics recognition has an excitingand promisingfuture. The GREC workshops provide an opportunity for researchers at all levels of experience to share insights into graphics recognition methods. The workshops enjoy strongparticipation from researchers in both industry and academia. They are sponsored by IAPR TC-10, the Technical Committee on Graphics Recog- tion within the International Association for Pattern Recognition. Edited v- umes from the previous three workshops in this series are available as Lecture Notes in Computer Science, Vols. 1072, 1389, and 1941. After the GREC 2001 workshop, authors were invited to submit enhanced versions of their papers for review. Every paper was evaluated by three reviewers. We are grateful to both authors and reviewers for their careful work during this review process. Many of the papers that appear in this volume were thoroughly revised and improved, in response to reviewers’ suggestions.
Author: Claude Lemarechal Publisher: Elsevier ISBN: 1483188760 Category : Technology & Engineering Languages : en Pages : 195
Book Description
Nonsmooth Optimization contains the proceedings of a workshop on non-smooth optimization (NSO) held from March 28 to April 8,1977 in Austria under the auspices of the International Institute for Applied Systems Analysis. The papers explore the techniques and theory of NSO and cover topics ranging from systems of inequalities to smooth approximation of non-smooth functions, as well as quadratic programming and line searches. Comprised of nine chapters, this volume begins with a survey of Soviet research on subgradient optimization carried out since 1962, followed by a discussion on rates of convergence in subgradient optimization. The reader is then introduced to the method of subgradient optimization in an abstract setting and the minimal hypotheses required to ensure convergence; NSO and nonlinear programming; and bundle methods in NSO. A feasible descent algorithm for linearly constrained least squares problems is described. The book also considers sufficient minimization of piecewise-linear univariate functions before concluding with a description of the method of parametric decomposition in mathematical programming. This monograph will be of interest to mathematicians and mathematics students.
Author: Laure Beyala Publisher: Elsevier ISBN: 0081023723 Category : Medical Languages : en Pages : 186
Book Description
Connected objects today present a range of opportunities in medicine. We live in a new digital era where the monitoring and analysis of one's own health information no longer belongs solely to the realm of science fiction. The success of these new devices resides in their usage, which integrates seamlessly into the daily life of the user in order to continually collect the maximum amount of data. These medical connected devices therefore constitute a new hope in transforming user experience as well as the care pathway. They offer a better level of support and a better quality of life for those suffering from chronic illnesses or mental, sensorial or physical disabilities. However, these solutions also pose systematic problems, especially regarding the risks linked to their usage. This book presents a cartography which clearly details all the potential risk scenarios linked to the usage of connected devices as well as the actions which should be undertaken to promote balanced governance and guarantee the development of high-quality medical devices. - Aims to help the reader understand the difference between a connected object and a medical connected device - Identifies and evaluates all the potential risks and perspectives associated with the use of connected medical devices - Shows how to make a comprehensive risk analysis with standards like ISO 31000 and 14971
Author: Young-Bin Kwon Publisher: Springer ISBN: 9783642368233 Category : Computers Languages : en Pages : 0
Book Description
This book constitutes the thoroughly refereed post-conference proceedings of the 9th International Workshop on Graphics Recognition (GREC 2011), held in Seoul, Korea, September 15-16, 2011. The 25 revised full papers presented were carefully selected from numerous submissions. Graphics recognition is a subfield of document image analysis that deals with graphical entities in engineering drawings, sketches, maps, architectural plans, musical scores, mathematical notation, tables, and diagrams. Accordingly the conference papers are organized in 5 technical sessions, covering the topics such as map and ancient documents, symbol and logo recognition, sketch and drawings, performance evaluation and challenge processing.
Author: S L (Sergeĭ Lʹvovich) 190 Sobolev Publisher: Hassell Street Press ISBN: 9781013706981 Category : Languages : en Pages : 256
Book Description
This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. To ensure a quality reading experience, this work has been proofread and republished using a format that seamlessly blends the original graphical elements with text in an easy-to-read typeface. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Author: Kok-Kwang Phoon Publisher: CRC Press ISBN: 1482227223 Category : Technology & Engineering Languages : en Pages : 624
Book Description
Establishes Geotechnical Reliability as Fundamentally Distinct from Structural Reliability Reliability-based design is relatively well established in structural design. Its use is less mature in geotechnical design, but there is a steady progression towards reliability-based design as seen in the inclusion of a new Annex D on "Reliability of Geotechnical Structures" in the third edition of ISO 2394. Reliability-based design can be viewed as a simplified form of risk-based design where different consequences of failure are implicitly covered by the adoption of different target reliability indices. Explicit risk management methodologies are required for large geotechnical systems where soil and loading conditions are too varied to be conveniently slotted into a few reliability classes (typically three) and an associated simple discrete tier of target reliability indices. Provides Realistic Practical Guidance Risk and Reliability in Geotechnical Engineering makes these reliability and risk methodologies more accessible to practitioners and researchers by presenting soil statistics which are necessary inputs, by explaining how calculations can be carried out using simple tools, and by presenting illustrative or actual examples showcasing the benefits and limitations of these methodologies. With contributions from a broad international group of authors, this text: Presents probabilistic models suited for soil parameters Provides easy-to-use Excel-based methods for reliability analysis Connects reliability analysis to design codes (including LRFD and Eurocode 7) Maximizes value of information using Bayesian updating Contains efficient reliability analysis methods Accessible To a Wide Audience Risk and Reliability in Geotechnical Engineering presents all the "need-to-know" information for a non-specialist to calculate and interpret the reliability index and risk of geotechnical structures in a realistic and robust way. It suits engineers, researchers, and students who are interested in the practical outcomes of reliability and risk analyses without going into the intricacies of the underlying mathematical theories.
Author: Sébastien Da Veiga Publisher: SIAM ISBN: 1611976693 Category : Mathematics Languages : en Pages : 307
Book Description
This book provides an overview of global sensitivity analysis methods and algorithms, including their theoretical basis and mathematical properties. The authors use a practical point of view and real case studies as well as numerous examples, and applications of the different approaches are illustrated throughout using R code to explain their usage and usefulness in practice. Basics and Trends in Sensitivity Analysis: Theory and Practice in R covers a lot of material, including theoretical aspects of Sobol’ indices as well as sampling-based formulas, spectral methods, and metamodel-based approaches for estimation purposes; screening techniques devoted to identifying influential and noninfluential inputs; variance-based measures when model inputs are statistically dependent (and several other approaches that go beyond variance-based sensitivity measures); and a case study in R related to a COVID-19 epidemic model where the full workflow of sensitivity analysis combining several techniques is presented. This book is intended for engineers, researchers, and undergraduate students who use complex numerical models and have an interest in sensitivity analysis techniques and is appropriate for anyone with a solid mathematical background in basic statistical and probability theories who develops and uses numerical models in all scientific and engineering domains.
Author: FEYEL Philippe
Author: FEYEL Philippe
Author: Philippe Feyel
Author: IEEE Staff
Author: Dorothea Blostein
Author: Claude Lemarechal
Author: Laure Beyala
Author: Young-Bin Kwon
Author: S L (Sergeĭ Lʹvovich) 190 Sobolev
Author: Kok-Kwang Phoon
Author: Sébastien Da Veiga