Emploi des machines à commande numérique PDF Download

Author: David F. Rogers
Publisher: Morgan Kaufmann
ISBN: 1558606696
Category : Computers
Languages : en
Pages : 344

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Book Description
NURBS (Non-uniform Rational B-Splines) are the computer graphics industry standard for curve and surface description. They are now incorporated into all standard computer-aided design and drafting programs (for instance, Autocad). They are also extensively used in all aspects of computer graphics including much of the modeling used for special effects in film and animation, consumer products, robot control, and automobile and aircraft design. So, the topic is particularly important at this time because NURBS are really at the peak of interest as applied to computer graphics and CAD of all kind.

Author: Joachim von zur Gathen
Publisher: Cambridge University Press
ISBN: 1107245257
Category : Computers
Languages : en
Pages : 811

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Book Description
Computer algebra systems are now ubiquitous in all areas of science and engineering. This highly successful textbook, widely regarded as the 'bible of computer algebra', gives a thorough introduction to the algorithmic basis of the mathematical engine in computer algebra systems. Designed to accompany one- or two-semester courses for advanced undergraduate or graduate students in computer science or mathematics, its comprehensiveness and reliability has also made it an essential reference for professionals in the area. Special features include: detailed study of algorithms including time analysis; implementation reports on several topics; complete proofs of the mathematical underpinnings; and a wide variety of applications (among others, in chemistry, coding theory, cryptography, computational logic, and the design of calendars and musical scales). A great deal of historical information and illustration enlivens the text. In this third edition, errors have been corrected and much of the Fast Euclidean Algorithm chapter has been renovated.

Author: Stephen P. Radzevich
Publisher: John Wiley & Sons
ISBN: 1118522710
Category : Technology & Engineering
Languages : en
Pages : 251

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Book Description
Presents an in-depth analysis of geometry of part surfaces and provides the tools for solving complex engineering problems Geometry of Surfaces: A Practical Guide for Mechanical Engineers is a comprehensive guide to applied geometry of surfaces with focus on practical applications in various areas of mechanical engineering. The book is divided into three parts on Part Surfaces, Geometry of Contact of Part Surfaces and Mapping of the Contacting Part Surfaces. Geometry of Surfaces: A Practical Guide for Mechanical Engineers combines differential geometry and gearing theory and presents new developments in the elementary theory of enveloping surfaces. Written by a leading expert of the field, this book also provides the reader with the tools for solving complex engineering problems in the field of mechanical engineering. Presents an in-depth analysis of geometry of part surfaces Provides tools for solving complex engineering problems in the field of mechanical engineering Combines differential geometry and gearing theory Highlights new developments in the elementary theory of enveloping surfaces Essential reading for researchers and practitioners in mechanical, automotive and aerospace engineering industries; CAD developers; and graduate students in Mechanical Engineering.

Author: Wolfgang Straßer
Publisher: Springer Science & Business Media
ISBN: 3642615422
Category : Technology & Engineering
Languages : en
Pages : 534

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Book Description
This book is a result of the lectures and discussions during the conference "Theory and Practice of Geometric Modeling". The event has been organized by the Wilhelm-Schickard-Institut fiir Informatik, Universitat Tiibingen and took place at the Heinrich-Fabri-Institut in Blaubeuren from October 3 to 7, 1988. The conference brought together leading experts from academic and industrial research institutions, CAD system developers and experien ced users to exchange their ideas and to discuss new concepts and future directions in geometric modeling. The main intention has been to bridge the gap between theoretical results, performance of existing CAD systems and the real problems of users. The contents is structured in five parts: A Algorithmic Aspects B Surface Intersection, Blending, Ray Tracing C Geometric Tools D Different Representation Schemes in Solid Modeling E Product Modeling in High Level Specifications The material presented in this book reflects the current state of the art in geometric modeling and should therefore be of interest not only to university and industry researchers, but also to system developers and practitioners who wish to keep up to date on recent advances and new concepts in this rapidly expanding field. The editors express their sincere appreciation to the contributing authors, and to the members of the program committee, W. Boehm, J. Hoschek, A. Massabo, H. Nowacki, M. Pratt, J. Rossignac, T. Sederberg and W. Tiller, for their close cooperation and their time and effort that made the conference and this book a success.

Author: International Organization for Standardization
Publisher:
ISBN:
Category : Machine-tools
Languages : en
Pages : 256

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Book Description

Author: Martin Held
Publisher: Springer Science & Business Media
ISBN: 9783540541035
Category : Computers
Languages : en
Pages : 192

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Book Description
In this monograph the author presents a thorough computational geometry approach to handling theoretical and practical problems arising from numerically controlled pocket machining. The approach unifies two scientific disciplines: computational geometry and mechanical engineering. Topics of practical importance that are dealt with include the selection of tool sizes, the determination of tool paths, and the optimization of tool paths. Full details of the algorithms are given from a practical point of view, including information on implementation issues. This practice-minded approach is embedded in a rigorous theoretical framework enabling concise statement of definitions and proof of the correctness and efficiency of the algorithms. In particular, the construction of Voronoi diagrams and their use for offset calculations are investigated in great detail. Based on Voronoi diagrams, a graph-like structure is introduced that serves as a high-level abstraction of the pocket geometry and provides the basis for algorithmically performing shape interrogation and path planning tasks. Finally, the efficiency and robustness of the approach is illustrated with figures showing pocketing examples that have been processed by the author's own implementation.

Author: C. K. Chui
Publisher: Elsevier
ISBN: 1483271005
Category : Mathematics
Languages : en
Pages : 346

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Book Description
Topics in Multivariate Approximation contains the proceedings of an international workshop on multivariate approximation held at the University of Chile in Santiago, Chile, on December 15-19, 1986. Leading researchers in the field discussed several problem areas related to multivariate approximation and tackled topics ranging from multivariate splines and fitting of scattered data to tensor approximation methods and multivariate polynomial approximation. Numerical grid generation and finite element methods were also explored, along with constrained interpolation and smoothing. Comprised of 22 chapters, this book first describes the application of Boolean methods of approximation in combination with the theory of right invertible operators to bivariate Fourier expansions. The reader is then introduced to ill-posed problems in multivariate approximation; interpolation of scattered data by radial functions; and shape-preserving surface interpolation. Subsequent chapters focus on approximation by harmonic functions; numerical generation of nested series of general triangular grids; triangulation methods; and inequalities arising from best local approximations in rectangles. A bibliography of multivariate approximation concludes the book. This monograph will be of interest to mathematicians.

Author: Michael F. Worboys
Publisher: CRC Press
ISBN: 0748400656
Category : Technology & Engineering
Languages : en
Pages : 391

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Book Description
This aims to make the computing principles underlying geographic databases understandable and accessible to current and potential users of such systems. It overviews database system philosophy; describes database concepts eg storage, retrieval, architecture, conceptual modelling, and database querying.It then focuses on the characteristics of GIS, spatial data and spatial databases, concluding with a discussion of current/future research trends.

Author: Sam Stuart
Publisher: Elsevier
ISBN: 1483150674
Category : Technology & Engineering
Languages : en
Pages : 518

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Book Description
Engineering Equipment for Foundries covers the proceedings of the Seminar on Engineering Equipment for Foundries and Advanced Methods of Producing such Equipment, held in Palais des Nations in Geneva, Switzerland on November 28-December 2, 1977. This seminar is organized by the United National Economic Commission for Europe. This book is organized into five parts encompassing 39 chapters. Part I focuses on the economic problems of the foundry industry, particularly in connection with reduction of labor requirements and in calculating foundry production capacity. Part II highlights the problem of environmental pollution created by different branches of metallurgy, while Part III deals with the general problems concerning practices and technological developments in the foundry industry. Part IV describes the technological advances in molding and coremaking processes in foundry. This part also discusses the reduction of waste energy in permanent mold and die-casting foundries. Part V considers the transition to process and production automation of foundry equipment. This book will prove useful to metallurgical engineers, manufacturers, and researchers.

Author: Stark
Publisher: CRC Press
ISBN: 9780824775933
Category : Technology & Engineering
Languages : en
Pages : 280

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Book Description
This authoritative book -- discussing CAD/CAM in detail from the user's rather than the vendor's point of view -- provides the valuable information engineers and managers need for optimal CAD/CAM implementation and use. It introduces CAD/CAM hardware and software, and demonstrates how to select a CAD/CAM solution for your company's specific requirements ... explains how to implement a CAD/CAM system, with special attention to training and education, and with useful checklists ... describes ongoing systems ... presents an informative overview of CAD/CAM's industrial use ... and details case studies of CAD/CAM applications, representing a broad range of companies throughout the world, in various industrial sectors, at different stages of CAD/CAM use. Complete with a glossary that clearly defines all CAD/CAM terminology, this essential reference source is mandatory reading for mechanical, manufacturing, automotive and aerospace engineers and managers; CAD/CAM system vendors; computer manufacturers; graduate-level courses in mechanical and manufacturing engineering, CAD/CAM, and computer science; and professional seminars in mechanical, manufacturing, and automotive engineering. Book jacket.