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Technology CAD Systems by Franz Fasching,Stefan Halama,Siegfried Selberherr Pdf
As the cost of developing new semiconductor technology at ever higher bit/gate densities continues to grow, the value of using accurate TCAD simu lation tools for design and development becomes more and more of a necessity to compete in today's business. The ability to tradeoff wafer starts in an advanced piloting facility for simulation analysis and optimization utilizing a "virtual fab" S/W tool set is a clear economical asset for any semiconductor development company. Consequently, development of more sophisticated, accurate, physics-based, and easy-to-use device and process modeling tools will receive continuing attention over the coming years. The cost of maintaining and paying for one's own internal modeling tool development effort, however, has caused many semiconductor development companies to consider replacing some or all of their internal tool development effort with the purchase of vendor modeling tools. While some (noteably larger) companies have insisted on maintaining their own internal modeling tool development organization, others have elected to depend totally on the tools offered by the TCAD vendors and have consequently reduced their mod eling staffs to a bare minimal support function. Others are seeking to combine the best of their internally developed tool suite with "robust", "proven" tools provided by the vendors, hoping to achieve a certain synergy as well as savings through this approach. In the following sections we describe IBM's internally developed suite of TCAD modeling tools and show several applications of the use of these tools.
The importance of CAD to electronics technology Computer-aided design (CAD) is one way of coping with the problem of how to design and build very complex systems. This problem is particularly acute in electronics technology. Designs are now (1984) said to be design-limited, rather than technology-limited. It can take months to generate a design for a chip, so that it might be obsolete before it can be manufactured. Manual design of large-scale integration (LSI) chips (circa 10,000 gates) is almost impossible. However, using current technology it is possible to produce chips having 250,000 gates. It is understandable, therefore, that there is great interest in improving existing CAD systems. Designers of CAD systems are concerned with formalizing and automating as much of the design task as possible. Automating design of any kind has long been acknowledged as a project fraught with intractable problems. A human designer has to have an understanding of the nature of the materials used in manufacture, a knowledge of common problems and well-tried solutions, and above all, creativity in producing new designs. Understanding, knowledge and creativity are three properties even the most artificially intelligent of computer programs have been entirely lacking in until very recently. Some people would deny computers these qualities entirely, on philosophical grounds (eg Dreyfus 1979; Searle 1981). There are few theories in cognitive psychology which can help.
Intelligent CAD Systems I by Paul J.W. ten Hagen,Tetsuo Tomiyama Pdf
CAD (Computer Aided Design) technology is now crucial for every division of modern industry, from a viewpoint of higher productivity and better products. As technologies advance, the amount of information and knowledge that engineers have to deal with is constantly increasing. This results in seeking more advanced computer technology to achieve higher functionalities, flexibility, and efficient performance of the CAD systems. Knowledge engineering, or more broadly artificial intelligence, is considered a primary candidate technology to build a new generation of CAD systems. Since design is a very intellectual human activity, this approach seems to make sense. The ideas of intelligent CAD systems (ICAD) are now increasingly discussed everywhere. We can observe many conferences and workshops reporting a number of research efforts on this particular subject. Researchers are coming from computer science, artificial intelligence, mechanical engineering, electronic engineering, civil engineering, architectural science, control engineering, etc. But, still we cannot see the direction of this concept, or at least, there is no widely accepted concept of ICAD. What can designers expect from these future generation CAD systems? In which direction must developers proceed? The situation is somewhat confusing.
CAD Systems Development by Dieter Roller,Pere Brunet Pdf
Future computer aided design systems will themselves be designed using tools and methods that are still under development. This book presents the latest progress in research on the tools and methods needed to develop those CAD systems. The topics covered include algorithmic aspects, the product data and development process, future CAD architectures, feature based modeling and automatic feature recognition, complex surface design, and system implementation issues. The book contains contributions by the world's leading experts in the field of CAD technology from both universities and industry. The contributions are based on lectures given at the International Conference and Research Center for Computer Science, Schloss Dagstuhl, Germany.
Intelligent CAD Systems I by Paul J.W. ten Hagen,Tetsuo Tomiyama Pdf
CAD (Computer Aided Design) technology is now crucial for every division of modern industry, from a viewpoint of higher productivity and better products. As technologies advance, the amount of information and knowledge that engineers have to deal with is constantly increasing. This results in seeking more advanced computer technology to achieve higher functionalities, flexibility, and efficient performance of the CAD systems. Knowledge engineering, or more broadly artificial intelligence, is considered a primary candidate technology to build a new generation of CAD systems. Since design is a very intellectual human activity, this approach seems to make sense. The ideas of intelligent CAD systems (ICAD) are now increasingly discussed everywhere. We can observe many conferences and workshops reporting a number of research efforts on this particular subject. Researchers are coming from computer science, artificial intelligence, mechanical engineering, electronic engineering, civil engineering, architectural science, control engineering, etc. But, still we cannot see the direction of this concept, or at least, there is no widely accepted concept of ICAD. What can designers expect from these future generation CAD systems? In which direction must developers proceed? The situation is somewhat confusing.
In the realm of CAD & Office Integration a new technology has been introduced that will overturn many accepted ideas, both for developer and end-user. What is this revolutionary new technology? Called "OLE for Design and Modeling" it is an enhancement of Microsoft Windows OLE for high performance CAD/CAM/CAE-software. With this book, the reader will understand, how OLE for D&M enables users to introduce and manipulate CAD models within regular text-processing and DTP-documents. And why even high-end 3D design objects can now be transferred between different systems using easy "drag and drop" operations. Furthermore this "plug and play" CAD technology makes it possible to use older CAD documents and older software in an entirely new context. If you want to know, where technology is going to, you should read it.
CAD Systems in Mechanical and Production Engineering by Peter Ingham Pdf
Uses Autodesk's AutoCAD, Computervision's Personal Designer, and Micro Control Systems' CADKEY as example systems. Requires only elementary mathematics and a basic knowledge of computer hardware devices.
Seminar paper from the year 2013 in the subject Computer Science - Software, grade: B, The University of Liverpool, language: English, abstract: CAD/CAM is the advanced technology used in manufacturing process by the assistance of computers and softwares. In traditional manufacturing drawing is done by drafting in which modification and prototyping took more time and cost, but the latest CAD software’s eliminated this by software interface like ProE. Not only designing but also manufacturing was hectic involving lot of machine for single operations but latest advanced CNC machines integrated with computer known as CAM avoids these troubles.
Advanced CAD/CAM Systems by René Soenen,Gustav J. Olling Pdf
This book provides up-to-date information about the promising use of feature technology for integrating computer-aided-design with subsequent applications. The book consists of 20 articles based upon the international IFIP conference on this topic held in Valenciennes, France in May 1994.
The Management of CAD for Construction by Stanley Port Pdf
In the era of Information Technology, the computer is the machine-tool. Designers and planners are information workers and many have turned to CAD technology, hoping to find something that will ensure survival in the increasingly competitive business climate. The new problem relates not to any limitations of systems, but to the lack of knowledge on how to implement, manage and control the CAD technology. This book is aimed at design professionals, planners and managers. Although references and examples relate to building and construction work, most of the principles are unlikely to differ whatever the application. As a result, it should be useful in the fields of mechanical engineering and manufacturing industry too. Chapter 13 deals with applications in construction planning, space planning and facilities management. Emphasis throughout is on people, responsibilities, applications, organisation and procedures. The design process is highly interactive. Manual drawing, or use of a computer drafting system to mimic this, inevitably leads to inconsistencies within in the design information. Computer modelling of projects presents better opportunities and the many techniques range from 2-D modelling to solid modelling. A blend of 2-D and 3-D methods to suit the application is essential today. System planning itself requires a carefully managed feasibility study comprising preliminary and detailed phases. Objectives and requirements of the office must be set down. Then there is something to compare the available systems with. The chosen system must be capable of evolving to meet an ever-changing future.
Evaluating the Use of Cad Systems in Mechanical Design Engineering (Classic Reprint) by David Chandler Robertson Pdf
Excerpt from Evaluating the Use of Cad Systems in Mechanical Design Engineering There has been some debate, however, over the benefits of cad systems While many organizations have made large investments in cad technology, some of these organizations do not believe their money was well spent. These organizations are not seeing the benefits they expected from their systems. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Principles of Computer-aided Design and Manufacturing by Farid M. L. Amirouche Pdf
Principles of Computer-Aided Design and Manufacturingis the product of many years of experience teaching courses in computer-aided design (CAD). My first book, published in 1991, was a challenge—the technology was evolving and both the hardware and software were changing rapidly. Since then we have come a long way in the CAD/CAM area, and the prospects are even better for future intelligent systems that will enable engineers to design engineering products more efficiently. From design to development, we are attaining some great achievements that will engineer products that are more competitive and ready to meet the market needs. In essence, CAD will provide the engineer more time for the creative aspects in terms of concept formulation and interpretation of the results derived from the analysis. The tools of CAD/CAM are now more standardized and most of our students today come equipped with the basic engineering graphics knowledge needed to learn advanced engineering tools. Having gone through the experience of teaching this course and at the same time trying to adapt to the changing needs in the laboratory, I have written this book under the premise of providing the students the fundamentals needed to advance their understanding of design, analysis, and product development in manufacturing. The latter is achieved through selection of appropriate topics and analytical methods in all aspects of design that are pertinent to CAD with the hope that students will embrace them with conviction. These topics are written in a clear and concise form, and are followed by examples to guide the students and engineers through a wonderful learning experience. The thrust behind learning and teaching CAD is the ability to reach a level of confidence that will enable oneself to interact with ease with the existing CAD systems to solve engineering problems. My philosophy is to teach through examples; hence, every topic covered is followed by examples to demonstrate the concepts. The basic engineering concepts learned in this book are independent of any specific software. We are at a stage now in which CAD/CAM does not necessary have to be self-contained. Rather, students should be able to use other tools to link or provide additional information as necessary to the CAD system. Where some topics could be supplemented, I have taken the liberty in this textbook of allowing the students to perform their exercises using MATLAB for the sake of understanding that CAD is a multidiscipline in nature and some parts of the design or analysis can be programmed in other languages. This is becoming a common practice as vendors are making it simpler and easier to transport files from different systems, and in some cases even be able to integrate different analysis tools to provide the students and engineers the ability to interact with their software to meet their engineering needs. This is certainly true in the variational design and parametric designs areas in which engineering equations are the engine behind the geometrical formulation and design of certain products. This textbook is written to satisfy the CAD requirements courses even though finite element coverage expands beyond the introduction of truss analysis. It is difficult to cover all topics in one semester. Topics should be selected to meet the course needs and the laboratory requirements that go with it. For example, at the University of Illinois at Chicago, we have a required laboratory part of the course where students are given different projects on weekly basis to become proficient in the use of CAD software such as ProE or IDEAS. The last lab projects are more involved and usually require some forms of analysis and animation. My intention is to provide additional topics in finite elements that will allow the instructor to focus not only on simple trusses but also be able to teach heat conduction, basic principles in FEM, and even vibration to broaden the scope of analysis. The idea is one that allows our senior students to be exposed to FEM by combining most of what they have learned and show how it can be done with the help of this powerful technique of FEM. This has been very successful with our undergraduate students and first-year graduate students because they are able to use this textbook to learn the basic concepts required in analysis to be able to use finite element tools such as ANSYS, IDEAS, and CATIA, among others. The book is divided into 15 chapters and provides a unique balance of topics that cover design, 3D transformation and geometry manipulation, surface creations, solid modeling, optimization, finite elements, robotics and robot economics, and CAM implementation. Chapter 1 provides a historical perspective of CAD and discusses virtual reality as it is used in our current engineering environment (the latter is a topic that will need to be explored further down the road). Chapter 2 addresses the different stages in design and provides concrete examples showing how these steps can be accomplished. The unique feature of this chapter is the parametric and variational design concept. In this textbook I have made an effort to enlighten the students with the need for these techniques to be taken seriously as they might become standard in the near future. The blending of man and machine is an effective tool when CAD systems are allowed to participate in the design and manufacturing process by aiding in the problem formulation, synthesis, conceptualization, and, of course, analysis. Once the students have had some exposure to CAD in general, Chapter 2 could be covered at any part of the course. I urge the instructors and readers to take the time and go over these examples and to create their own examples to appreciate the benefits of these tools. Chapter 3 discusses 2D and 3D transformations and geometry manipulation, and provides an in-depth analysis of images in 2D and 3D, and includes isometric views. Chapter 4 explains the fundamentals underlying splines, parametric and nonparametric curves, and Bezier curves and surfaces. A number of examples are included to assist the students in understanding how the concepts are implemented. Depending on how advanced the students are, selected topics can be skipped or simply assigned as additional material for the class. Chapter 5 introduces the concept of solid modeling and the various construction techniques and representation schemes in modeling. The students will apply some of these concepts in their lab work working with the making of solid models in CAD. Chapter 6 covers various techniques of optimization and introduces the students to the basic concepts of how to formulate an objective function, define the appropriate constraints, and choose the analytical tools to solve the problem. This chapter also focuses on popular techniques in optimization so that senior students and first-year graduate students will have some familiarity with their use. Chapters 7 through 10 form a unique combination of teaching the finite element method to our junior and senior students without the burden of heavy calculus. It is one of the major strengths of this textbook. If a curriculum is more focused on analysis, all chapters can be covered; otherwise, the instructor is given the choice of covering FEM by selecting the appropriate topics) for the class. This would include stress analysis, heat conduction, dynamic analysis, and vibration, or simply teaching the basic formulation of FEM as described in Chapter 7. The examples solved in these chapters represent real applications and will encourage the students to develop a good appetite for FEM. Computer-aided manufacturing is introduced in Chapters 11 through 15. I have opted to focus on key topics of interest to the students such as robotics and economic impact, group technology, and computer-integrated manufacturing. These are some of the features that need to be understood in the integration of CAD and CAM. Principles of Computer-Aided Design and Manufacturingis written for junior and senior level students and first-year graduate students who have had little exposure to computer-aided design. This textbook assumes that the students have some experience with programming and understand basic concepts in CAD found in a freshman course of graphics. This textbook is suitable for students who have had all their undergraduate requirements in their major. The latter is an incentive whereby students will fully appreciate the benefits of design techniques such as parametric and variational design and develop a deep understanding of how FEM works and how it is applied to various engineering applications. I am indebted to the reviewers for their useful comments and suggestions, which helped shape the content and focus of this book: Dr. Heana Costea, California State University at Northridge; Derek M. Yip-Hoi, University of Michigan at Ann Arbor; and Gregory Kremer, Ohio State University. I would also like to thank Dr. M. Ayub, visiting professor in the Civil Engineering Department at University of Chicago at Illinois, for taking the time to edit several chapters and provide his insight for the book and M. Arif, associate professor in the Civil Engineering Department at University of Chicago at Illinois, for his encouragement and support. The comments and suggestions of the reviewers were instrumental in my final revision and in selecting additional topics that were missing from the original proposal. They kindly helped review my original manuscript and assisted me in looking at their course focus and syllabus to get a better picture of how the CAD course is taught at their respective institutions. Finally, I am indebted to all my students who have assisted me in the preparation of necessary materials for this book; without their help, this wouldn't have been possible. In particular, I would like to thank Carlos Lopez for his efforts on the parametric and variational designs section of the book. I also like to thank Francisco Romero, Nagarajan Chandra, Pedro Gonzalez, and David McNeil for their genuine effort in assisting with some of the graphics of the book. I would like to thank Nikhil Khulka and Ivan Zivkovic for being there when I needed them the most to meet the publisher deadlines and organize the chapters and figures selected for the book. I also would like to thank Surya Pratar for helping with indexing of this book. Finally, let me take this opportunity to thank the editorial staff, Dorothy Marrero, David George, and Lynda Castillo at Prentice Hall, for their patience during the course of the production of the book. I had the pleasure of working closely with Kevin Bradley at Sunflower Publishing Services, who oversaw the complete publication of the book. He was kind and very responsive to all my questions. He worked intelligently to make sure I was happy with the changes and the editing of my book. At the end I would like to thank my family, Ginger, Larby, and Anissa, for their unconditional love and support and for their understanding in the sacrifices we make in achieving our objectives. In particular, I would like to thank my mom and dad for giving me hope, guidance, and values to treasure for years to come. FARID AMIROUCHE The Department of Mechanical & Industrial Engineering University of Illinois, Chicago
