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International Conference on VLSI design

作者： V.K. Anuradha V. Visvanathan Electrical Communication Engineering Department Indian Institute of Science Bangalore India Supercomputer Education and Research Centre Indian Institute of Science Computer-Aided Design Laboratory Bangalore India

A CORDIC based processor array which can be programmed by switch setting to compute the Discrete Hartley, Cosine or Sine Transforms or their inverses is described. Through a novel formulation of the transform computations in the CORDIC framework, N-point transforms are mapped on to a linear array of /spl lsqb/N/2/spl rsqb/+1 CORDIC processors with minimal control overhead to incorporate the programmability.< >

关键词： Discrete transforms Discrete cosine transforms DH-HEMTs Switches computer architecture Integrated circuit interconnections Arithmetic Very large scale integration Equations Communication switching

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Audible noise in speed‐controlled inverter‐fed medium‐sized induction motors

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European Transactions on Electrical Power 1995年第1期5卷 5-13页

作者： Muster, J. Budig, P.K. Belmans, R. Geysen, W. Sattler, Ph.K. Jorg Muster (1955) studied Electrical Engineering at the Technische Hochschule Karl-Mm-StadtlGerrnany from 1974 to 1978. Till 1985 he was Assistant at the chair of Electrical Machines and Drives absolved with promotion about losses and torques of inverter supplied AC machines. From 1985 until 1988 he worked for a tool-machine factory developing high-speed AC drives. Since 1988 he is Scientific Assistant at the chair of Electrical Machines and Drives at the Technische Universität ChemnitdGermany. (TU ChemniWZwickau Dezernat 5.0 Technologietransfer Carolastr. 8 D-09 I l l Chemnitd Germany T +*** Fax +49371/686240) PeW-KlaUs Budig (1928) studied Electrical Engineering at the Technische Hochschule Dresden/Germany from 1948 till 1952. For two years he was Assistant at the chair of Electrical Machines and Drives. From 1954 he was with Sachsenwerk Dresden. He was involved in research and development of amplidyne three-phase commutator-machines DC and AC traction motors thyristor-supplied traction motors. For some years he was Chief Technologist and finally Chief Engineer. At this time he is planning the production of new types of electrical machines like hermetic-motors rolling-mill motors. hydrogenerators and fractional horsepower induction motors. 1966 he got a call as a Professor to theTechnical University at Chemnitz/Germany. His research activities are three-phase linear motors thyristor-supplied DC motors. electric cars. computation of magnetic fields multi-motor AC drives high precision drives for the submicrorneter-range. magnetic bearing and high speed AC drives. (TU ChemnitdZwickau Fachbereich Elektrotechnik Carolastr.8 D-0911 l ChemnitdGermany T+49371/5613323 Fax +49371/5613361) Ronnie J. M. Belmans (1956) received the M.Sc. degree in Electrical Engineering from the Katholieke Universiteit LeuvenBelgium in 1979 the Ph.D. degree from the same university in 1984 and the Special Doctorate in 1989. From 1979 to 1985 he was a member of the staff of the Katholieke Universiteit Leuven. Currently

The audible noise produced by three‐phase, squirrel‐cage induction motors, is caused by the space harmonics of the flux‐density distribution in the air gap of the machine. When the motor is supplied by a frequency inverter in order to control the speed, time harmonics in both current and voltage are present, yielding new components in the audible noise spectrum. In the paper, a number of motor‐inverter combinations are compared for medium‐sized induction motors (90 kW). As a reference case, the motors are supplied with a generator, delivering a variable frequency without harmonics. Theoretical explanations for the increase of the audible noise level and the additional frequency components are given. Copyright © 1995 John Wiley & Sons, Ltd.

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INTEGRAL-EQUATION FORMULATION OF RADIATION FROM RECTANGULAR WAVE-GUIDES AND HORNS

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INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 1994年第3期7卷 155-166页

作者： MOHEB, H SHAFAI, L Department of Electrical & Computer Engineering University of Manitoba Winnipeg Manitoba Canada R3T 2N2 Lotfoilah Shafai (S'67-M'69-SM'75-F'88) was born in Maragheh Iran in 1941. He received the B.Sc. degree from the University of Tehran Iran and the M.Sc. and Ph.D. degrees from the University of Toronto Toronto Ontario Canada in 1966 and 1969 respectively all in electrical engineering. Since 1969 he has been with the Electrical Engineering Department of the University of Manitoba where he is currently a Professor and holder of the Electromagnetic Chair. The period July 1976 to January 1977 he spent at the Communication Research Centre Ottawa Canada as a Research Scientist and he contributed to the design of the low-cost earth station antenna for the Hermes satellite. From January 1977 to July 1977 he was with the Electromagnetics Institute of the Technical University of Denmark as a Visiting Professor and conducted research on the modelling of corrugated horns for the European Space Agency. His main research interests are in applied electromagnetics antennas and computer-aided design. He is the recipient of numerous awards the most recent ones include the University of Manitoba Merit Award in Research 1987 and 1989 Sigmaxi Senior Scientist Award 1989 and Maxwell Premium Award (IEE) 1990.

The radiation field patterns of rectangular waveguides and horns of finite dimensions are obtained numerically. The electric field integral equation is formulated to relate their radiation patterns to the surface current distribution. These currents are determined numerically by reducing the integral equation to a matrix equation, using the moment method. The computed currents are then used to calculate the radiation patterns and cross-polar fields of the finite waveguides and horns. The method is numerically efficient and can be applied to the computation and optimization of the antenna feed configurations.

关键词： Directional patterns (antenna)

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USING VIRTUAL ENVIRONMENTS IN THE design OF SHIPS

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NAVAL ENGINEERS JOURNAL 1994年第3期106卷 91-106页

作者： JONS, OP RYAN, JC JONES, GW Otto P. Jons:received a Diplom Ing. in shipbuilding from the Technical University of Hanover W. Germany and an MS in naval architecture and marine engineering from MIT. He then joined Litton Ship Systems where he was responsible for the preliminary design of the DD-963 hull structure and then for ship system integration as manager LHA ship systems engineering department. From 1972 to 1974 he was the principal research scientist at Hydronautics. In 1974 as technical director he helped establish the Crystal City office of Designers and Planners. Mr. Jons was one of the co-founders of Advanced Marine Enterprises Inc. in 1976 where he serves as corporate vice president engineering. J. Christopher Ryan:earned his bachelors and masters degrees in naval architecture from Webb Institute and MIT respectively. He spent three years at the advanced marine technology division of Litton Industries working on the DD-963 class ship design and related computer aided design projects. He subsequently went to the Navy Department concentrating on early stage design of surface combatants for twelve years including work on the FFG-7 Sea Control Ship CSGN and CVV aircraft carrier projects. He then shifted focus and became the Technical Director for the Computer Supported Design Program in NavSea for five years. Mr. Ryan has served in several supervisory positions within the Ship Design Group in NavSea since that time. He is currently the director of the future ship concepts division. Gary W. Jones:graduated from the University of Tennessee in 1971 with a BS in mechanical engineering and followed up with graduate work at George Washington University and the University of Maryland. Mr. Jones was with the Naval Sea Systems Command from 1971 until 1988 where he was a naval architect in the submarine section of the hull form design division. In 1988 he was detailed to the Defense Advanced Research Projects Agency (DARPA) where he became the program manager for the advanced submarine technology program's hydrodynamic hydroac

A major contributor to the expense and length of time to design, build, and test new systems has been the need to build and test hardware prototypes to determine their effectiveness in meeting operational requirements. Recent and dramatic advances in computer simulation technologies hold forth the promise of revolutionizing design and acquisition strategies by providing the means to validate end users' requirements prior to hardware construction. By designing and operationally testing virtual prototypes in a virtual environment, these technologies will soon offer naval architects the ability to build and launch ships in computer-based cyberspace in lieu of the shipbuilder's ways. The authors of this paper provide the background for these developments, explore the significance and ramifications of these technologies to the current process of ship and system design, outline challenges lying ahead, and present their vision and recommendations for future development.

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2-DIMENSIONAL FDTD AND TLM

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INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 1994年第2期7卷 141-153页

作者： KRUMPHOLZ, M RUSSER, P Ferdinand-Braun-Institut Für Höchstfrequenztechnik Rudower Chaussee 5 12489 Berlin Germany Michael Krumpholz was born in Bonn Germany in 1966. He received the Dip1.-Ing. degree in electrical engineering at the Technische Universitat Miinchen in 1991. From 1991 to 1992 he worked as a research assistant at the Lehrstuhl fur Hochfrequenztechnik Technische Universitat Miinchen. In 1992 he joined the Ferdinand-Braun-Institut fur Hochstfrequenztechnik in Berlin. His research interests are numerical methods for the solution of Maxwell's equations. Peter Russer was born in Vienna Austria in 1943. He received the Dipl.-Ing. degree in 1967 and the Dr.techn. degree in 1971 both in electrical engineering and both from the Technische Universitat in Vienna Austria. From 1968 to 1971 he was Assistant Professor at the Technische Universitat in Vienna. In 1971 he joined the Research Institute of AEG-Telefunken in Ulm where he worked on fibre-optic communication high-speed solid-state electronic circuits laser modulation and fibre-optic gyroscopes. In 1979 he was co-recipient of the NTG award. Since 1981 he has held the chair of Hochfrequenztechnik at the Technische Universitat Miinchen. He was Visiting Professor in 1990 at the University of Ottawa and in 1993 at the University of Victoria. Since October 1992 he has been Director of the Ferdinand-Braun-Institut fur Hochstfrequenztechnik in Berlin. His current research interests are integrated microwave and millimetre-wave circuits electromagnetic fields statistical noise analysis of microwave circuits and methods for computer-aided design of microwave circuits. Peter Russer is the author of numerous scientific papers in these areas. He is a fellow of the Institute of Electrical and Electronics Engineers (IEEE) and a member of the German Informationstechnische Gesellschaft and the Austrian and German Physical Societies.

Applying the method of moments to Maxwell's equations, Yee's two-dimensional FDTD scheme with central difference approximations and the two-dimensional TLM method are derived from first principles of field theory. By comparing the eigenvalues of the two methods, the differences between two-dimensional FDTD and TLM are illustrated.

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An investigation into mathematical models of optimal tolerancing supporting concurrent engineering

An investigation into mathematical models of optimal toleran...

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ASME 1993 International computers in Engineering Conference and Exposition, CIE 1993

作者： Zhang, Genbao Porchet, Michel Department of Mechanical Engineering Computer-Aided Design Laboratory Swiss Federal Institute of Technology Lausanne Switzerland

ISBN: (纸本)9780791897645

This paper presents a new tolerance design theory — simultaneous tolerancing which works in the concurrent engineering context. After the necessity to develop a simultaneous tolerancing theory is stated, by showing the shortcomings of conventional tolerancing technique, the concept of simultaneous tolerancing is given, and its elements are briefly presented. Then we focus our attention on the development of a general mathematical model of optimal tolerancing supporting concurrent engineering. Two commonly used models, worst-case and statistical, are discussed in detail. Next, a method of "interim tolerances", which help to determine an appropriate machining process without using functional tolerances, is proposed. The simultaneous tolerancing theory presented in this paper permits of determining directly optimal machining tolerances in product design, reducing the manufacturing cost and improving the quality of products. © 1993 ASME 1993 International computers in Engineering Conference and Exposition, CIE 1993. All rights reserved.

关键词： Fits and tolerances

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The study of a multi-component system using a complete cad software package

The study of a multi-component system using a complete cad s...

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ASME 1993 International computers in Engineering Conference and Exposition, CIE 1993

作者： Lewis, Burton Computer-Aided Design Laboratory Department of Mechanical Engineering Swiss Federal Institute of Technology Lausanne Switzerland

ISBN: (纸本)9780791897645

When performing a complete study on the design of a multi-component system of at least two components, can a CAD software perform to expectations, that is, can we do a complete study on the entire multi-component system including bearing analysis for the contact between rotating components, and simple interference checks? In this paper, I will describe simple steps and precautions to take when doing a study on the design and performance of a multi-component system using a complete CAD package - including a Drafting module, a Solid Modeler, and a Finite Element Analysis module. I will use an example of a system of multiple rotating arms to show that from a 2-D blueprint, using the drafting module, we can enter the complete geometry of each arm separately, then pass on to the solid modeler. Once the solid 3-D model is constructed, we can transfer the model onto the finite element analysis module of the CAD package and test the model. After the model satisfies all requirements, we can come back to the solid modeler and check the "modified" version of the model by updating the previous solid model. If all is well at this point, then we can move on to the superposition of the 3-D solid model into a 2-D version to perform tolerance analysis. After tolerance analysis, we can move on to the final stage which is to update the 2-D drafting version adding the tolerances recently obtained. This is a general outline and should be straight forward except for the problems that we could encounter especially in the solid modeler and the finite element analysis module. The study or design principals of a multi-component system is not the subject of this paper, but how to perform such a study using all the available modules of a CAD package. There are few complete CAD packages on the market today that allow such a study, but transferring data, whether it is of finite elements, solid models, or 2-D geometry, is much easier today using a variety of different types of transfer files. Som

关键词： computer aided design

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Spline based design of cam contours for improved dynamic performance

Spline based design of cam contours for improved dynamic per...

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ASME 1993 International computers in Engineering Conference and Exposition, CIE 1993

作者： Ault, Holly K. Wilkinson, James C. Department of Mechanical Engineering Computer Aided Design Laboratory Worcester Polytechnic Institute WorcesterMA United States

ISBN: (纸本)9780791897645

A method for the integrated design and manufacture of radial plate cams is discussed. Currently, a cam-follower system is designed by specifying constraints on the motion of the follower. The physical cam contour or cam pitch curve are not mathematically defined. The cam is manufactured from the discretized follower motion program. A new method for cam design is proposed which will produce a smooth, mathematically defined cam pitch curve while maintaining the proper constraints on the follower motion. Piecewise polynomial functions in the form of rational and/or non-rational splines may be used. Cams will be manufactured using smoothed profiles and tested for improved dynamic performance. The results of initial investigations of cam profile design for this research are presented. © 1993 ASME 1993 International computers in Engineering Conference and Exposition, CIE 1993. All rights reserved.

关键词： Gas turbines

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Wavelet Transform Coding of Color Images

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Progress in Natural Science:Materials International 1993年第6期 535-545页

作者：胡国生鲍虎军 Department of Applied Mathematics and State Key Laboratory of Computer Aided Design & Computer Graphics Hangzhou 310027 PRC Zheijiang University

An efficient coding method based on wavelet transform is presented for color *** tristimulus signals R,G,B of the original images are first converted into the Y,I,Q signals,whichare then decomposed into the luminance and edge subimages with the wavelet ***,the edgesubimages are encoded with edge pattern vector quantization while the cosine transform coding method isused to encode the luminance *** results are obtained for coding of color images in thebitrate range from 0.24 to 0.50 bits/***,because of the simplicity of the structure in ourmethod,it is suitable for hardware implementation,and can be used in real time encoding system.

关键词： wavelet transform image decomposition edge pattern vector quantization image coding

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Structural synthesis under manufacturability constraints: A CAD system for the design of injection-molded product housings

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Research in Engineering design 1993年第3-4期5卷 185-201页

作者： Dighe, Rahul Jakiela, Mark J. Wallace, David R. Computer-Aided Design Laboratory Department of Mechanical Engineering Massachusetts Institute of Technology Cambridge 02139 MA Room 3-461a United States

We describe a computer-aided design system that automatically constructs the internal functional surface shapes of plastic injection molded product housings. Fundamental manufacturability constraints related to the geometry of injection mold parting and the solidification of molten plastic are identified. These constraints are embodied in structural synthesis operators that create the internal shapes given a set of functional requirements. An implementation, which is integrated with a system that automatically designs the external visible surface of the housing, is discussed. Algorithms for the structural synthesis operators are provided along with sample output demonstrating their operation. © 1993 Springer-Verlag London Limited.

关键词： computer-aided design design for manufacture Injection molding Structural synthesis

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