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Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： Y. Yue J.J. Liou I. Batarseh Computer-Aided Design Department Harris Semiconductor Corporation Melbourne FL USA Electrical and Computer Engineering Department University of Central Florida Orlando FL USA

The insulated-gate bipolar transistor (IGBT) is the most advanced and promising power switching device. This paper presents an analytical model for the steady-state and transient characteristics of such a device. The model is derived rigorously from the ambipolar transport equation and is valid for all free-carrier injection conditions, rather than just for a special case (i.e., low or high free-carrier injection) considered in the IGBT models reported to date in the literature. Results simulated from a two-dimensional device simulator called MEDICI are also included in support of the model.

关键词： Steady-state Insulated gate bipolar transistors Equations Charge carrier processes Threshold voltage Electron mobility Medical simulation Predictive models Insulation Analytical models

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An integrated simulation-based design and manufacturing environment using intranet and corba

An integrated simulation-based design and manufacturing envi...

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ASME 1997 design engineering Technical Conferences, DETC 1997

作者： Hardee, Edwin Tsai, Chung-Shin Choi, Kyung K. Center for Computer-Aided Design College of Engineering The University of Iowa Iowa CityIA52242-1000 United States Technical Staff Structural Dynamics Research Corporation 2000 Eastman Drive MilfordOH45150-2789 United States Department of Mechanical Engineering College of Engineering The University of Iowa Iowa CityIA52242-1000 United States

ISBN: (纸本)9780791880470

An intranet-based tool for integrating an enterprise-wide simulation-based design and manufacturing environment for mechanical systems is presented. The tool is invoked as a Java applet from a web page. Users can browse global product model data from the applet and retrieve and store product data between the global product data server (called the design Data Server) and their local workspaces. Network connections are based on the CORBA standard. This environment enables the achievement of concurrent engineering goals. It gives the members of an enterprise-wide product development team a convenient, uniform interface to the global product data from different platforms. It allows their various simulation and modeling tools on the different platforms to interoperate through the design Data Server. © 1997 by ASME.

关键词： Intranets

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A unified formulation for swept volume and robot workspace analyses

A unified formulation for swept volume and robot workspace a...

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ASME 1997 design engineering Technical Conferences, DETC 1997

作者： Abdel-Malek, Karim Yeh, Harn-Jou Ruwady, Rabeeh Department of Mechanical Engineering American University of Beirut Aub New York Office 850 Third Avenue New YorkNY10022 United States Department of Mechanical Engineering Center for Computer Aided Design The University of Iowa Iowa CityIA52242 United States American University of Beirut Department of Mechanical Engineering Aub New York Office 850 Third Avenue New YorkNY10022 United States

ISBN: (纸本)9780791880449

This paper presents a unified formulation for the generation of mechanical manipulator workspaces, and the representation of the volume of an entity swept along another. A constraint function is developed and its Jacobian is studied. The analysis is based upon a row-rank deficiency criteria of the non-square constraint Jacobian. Singular geometric entities inside the resulting volume are identified and parametrized. These entities are characterized by a set of singular generalized coordinates (parameters), when substituted into the constraint vector function yield parametric equations. Singular geometric entities are assembled and intersected to identify sub-entities that are boundary to the volume. A local perturbation method is applied to determine which sub-entities are boundary to the workspace. Several examples are presented to verify the formulation. © 1997 by ASME.

关键词： Perturbation techniques

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The optimal cost chromatic partition problem for trees and interval graphs

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22nd International Workshop on Graph-Theoretic Concepts in computer Science, WG 1996

作者： Kroon, Leo G. Sen, Arunabha Deng, Haiyong Roy, Asim Erasmus University Rotterdam P.O. Box 1738 NL-3000 DR Rotterdam Netherlands Department of Computer Science and Engineering Arizona State University Tempe AZ 85287 United States Computer Aided Design Group Intel Corporation Santa Clara CA 95052 United States Department of Decision and Information Sciences Arizona State University Tempe AZ 85287 United States

ISBN: (纸本)3540625593

In this paper we study the Optimal Cost Chromatic Partition (OCCP) problem for trees and interval graphs. The OCCP problem is the problem of coloring the nodes of a graph in such a way that adjacent nodes obtain different colors and that the total coloring costs are minimum. In this paper we first give a linear time algorithm for the OCCP problem for trees. The OCCP problem for interval graphs is equivalent to the Fixed Interval Scheduling Problem with machine-dependent processing costs. We show that the OCCP problem for interval graphs can be solved in polynomial time if there are only two different values for the coloring costs. However, if there are at least four different values for the coloring costs, then the OCCP problem for interval graphs is shown to be NP-hard. We also give a formulation of the latter problem as an integer linear program, and prove that the corresponding coefficient matrix is perfect if and only if the associated intersection graph does not contain an odd hole of size 7 or more as a node-induced subgraph. Thereby we prove that the Strong Perfect Graph Conjecture holds for graphs of the form K × G, where K is a clique and G is an interval graph.

关键词： Costs

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Decision support for effective bidding in a competitive business environment

Decision support for effective bidding in a competitive busi...

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IEEE International Conference on Systems, Man and Cybernetics

作者： N. Cassaigne M. Kromker M.G. Singh S. Wurst Decision Technologies Group Computation Department UMIST (University of Manchester Institute of Science and Technology) Manchester UK Department of Computer-Aided Design Planning and Production Bremen Institute of Industrial Technology and Applied Work Science University of Bremen BIBA Bremen Germany

For enterprises with products that are tailor-made to order, both the efficiency and the effectiveness of bid preparation are essential prerequisites to sustain competitiveness. Preparing bids efficiently means reducing effort and resources to a minimum, while effectiveness implies high average success rates at good profit rates. Various approaches and systems exist that focus on increasing efficiency in bid preparation, but support allowing one to improve the effectiveness of the process is lacking. In the face of this situation, an advanced decision support system allowing a sales executive to determine the optimum sales price has been developed within the DECIDE (DECIsion support for optimal biDding in a competitive business Environment) project (ESPRIT Project No. 22298). To ensure a sound scientific and technological base as well as the optimal practical use of the system, three research institutes and universities, two industrial companies with complex engineered-to-order products and a software vendor are co-operating in the project. This paper describes the approach and presents intermediate results.

关键词： Marketing and sales Pricing computer industry Contracts Costs design automation Enterprise resource planning Production planning Technology planning Decision support systems

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Weighted mean squared error criterion with fixed-level modification for linear-phase FIR filter design

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CIRCUITS SYSTEMS AND SIGNAL PROCESSING 1996年第5期15卷 581-595页

作者： Mollova, GS Department of Computer-Aided Design Higher Institute of Architecture and Civil Engineering Sofia Bulgaria

This paper describes a new approach-a Fixed-Level Least Squares (FLLS) method for linear-phase FIR filter design. It is intended for rejection of the Gibbs phenomenon through the introduction of a set of equally spaced fixed levels in the transition band and subsequent redefinition of the approximated and weighted functions. Detailed mathematical solutions of the problem as well as many examples are given. The results in graphical form are shown as an output of the FLLS software model.

关键词： Digital filters

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An integrated system for computer aided design and analysis of multibody systems

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engineering WITH computerS 1996年第1期12卷 23-33页

作者： Hardell, C Division of Computer Aided Design Department of Mechanical Engineering Luleå University of Technology Luleå Sweden

An integrated system for design and analysis of multibody systems has been developed and is described in this paper: The use of the system is demonstrated through the example provided. The system consists of a commercially available CAD program and a multibody system analysis code developed at the Royal Institute of Technology in Stockholm, These tools are integrated using a relational database, the structure of which was developed at Lulea University of Technology, in order to get a complete system for design and analysis of multibody systems. The main gains fi om the integrated system are the possibilities of using calculated component data like mass and moment of inertia fi om the CAD program in the simulation models, the automatic formulation of input files for the analysis code, and finally the visualization of simulation results using the surface data of the solid models. The intel active structured query language (ISQL) of the database management system provides the possibility of examining the components of the multibody system during the design work and before any simulation is performed.

关键词： CAD database multibody system analysis

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Numerical algorithms for mapping boundaries of manipulator workspaces

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JOURNAL OF MECHANICAL design 1996年第2期118卷 228-234页

作者： Haug, EJ Luh, CM Adkins, FA Wang, JY Center for Computer Aided Design and Department of Mechanical Engineering The University of Iowa Iowa City IA

Numerical algorithms for mapping boundaries of manipulator workspaces are developed and illustrated. Analytical criteria for boundaries of workspaces for both manipulators having the same number of input and output coordinates and redundantly controlled manipulators with a larger number of inputs than outputs are well known, but reliable numerical methods for mapping them hale not been presented. In this paper, a numerical method is first developed for finding an initial point on the boundary. From this point, a continuation method that accounts for simple and multiple bifurcation of one-dimensional solution curves is developed. Second order Taylor expansions are derived for finding tangents to solution curves at simple bifurcation points of continuation equations and for characterizing barriers to control of manipulators. A recently developed method for tangent calculation at multiple bifurcation points is employed. A planar redundantly controlled serial manipulator is analyzed, determining both the exterior boundary of the accessible output set and interior curves that represent local impediments to motion control. Using these methods, more complex planar and spatial Stewart platform manipulators are analyzed in a companion paper.

关键词： Motion control Algorithms Numerical analysis Bifurcation Manipulators

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Developing a prototype concurrent design tool for composite topside structures

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NAVAL ENGINEERS JOURNAL 1997年第3期109卷 279-290页

作者： Dirlik, S Hambric, S Azarm, S Marquardt, M Hellman, A Bartlett, S Castelli, V Steve Dirlik:began his career at the Naval Surface Warfare Center Carderock Division in 1981 as an aerospace engineer co-op student. He completed his bachelor of science degree in aeropace and ocean engineering from Virginia Polytechnic Institute and State University in 1985 and his master of science degree in aerospace engineering from the University of Maryland in 1990. Mr. Dirlik recently completed a master of science program in applied physics at The Johns Hopins University and currently works in the Radar Cross Section and Target Physics Branch of the Signatures Directorate at the Naval Surface Warfare Center Corderoke Division. He has worked on Navy low observable programs since 1990. Stephen Hambric:is a research associate at the Applied Research Laboratory at The Pennsylvania State University. He received his B. S. and M.S. degree in mechanical engineering from Virginia Polytechnic Institute and State University and his D. Sc. in mechnical engineering from the George Washington University. He has worked on several computer aided multidiscikplinary design and optimization projects over the years including an automated propeller design system and a structural acoustic optimization capability. Dr. Shpour Azarm:is currently working as an associate professor with the Design and Manufacturing Group of the Department of Mechanical Engineering at the University of maryland at College Park. Dr Azarm's expertise is in the areas of optimization-based designed and concurrent design and optimization of multidisciplinary systems. He was a consultant at Black & Decker Corporation (summer 1996) and worked as a Navy senior summer faculty fellow (summer 1995) and a NASA summer faculty fellow (summer 1994). He was a visiting scientist at NASA Langley Research Center for Multidisciplinary Analysis and Applied Structural Optimzatiom at the University of Siegen in Germany (spring 1992) and the Design Institute of the Technical University of Denmark (summer 1990). Dr Azarm was an associate technical editor of the ASME Jour

A prototype concurrent engineering tool has been developed for the preliminary design of composite topside structures for modern navy warships. This tool, named GELS for the Concurrent engineering of Layered Structures, provides designers with an immediate assessment of the impacts of their decisions on several disciplines which are important to the performance of a modern naval topside structure, including electromagnetic interference effects (EMI), radar cross section (RCS), structural integrity, cost, and weight. Preliminary analysis modules in each of these disciplines are integrated to operate from a common set of design variables and a common materials database. Performance in each discipline and an overall fitness function for the concept are then evaluated. A graphical user interface (GUI) is used to define requirements and to display the results from the technical analysis modules. Optimization techniques, including feasible sequential quadratic programming (FSQP) and exhaustive search are used to modify the design variables to satisfy all requirements simultaneously. The development of this tool, the technical modules, and their integration are discussed noting the decisions and compromises required to develop and integrate the modules into a prototype conceptual design tool.

关键词： Warships

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Hydroelastic considerations in ship panel design

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NAVAL ENGINEERS JOURNAL 1997年第5期109卷 61-66页

作者： McCormick, ME Bhattacharyya, R Mouring, SE Dr. Michael E. McCormick:is a research professor of civil engineering at The Johns Hopkins University. Before joining the Hopkins faculty in 1994 he was a professor of ocean engineering for twenty-five years at the U.S. Naval Academy. In addition he has held full-time faculty positions at Swarthmore College Trinity College (Hartford) and the Catholic University of America. He was also a hydrodynamicist at the David Taylor Model Basin for more than four years. Prof. McCormick received his undergraduate degree in mathematics and physics from AmericanUniversity a masters degree in applied mechanics and a Ph.D. in mechanical engineering from Catholic University a Ph.D. in civil engineering and a Sc.D. in engineering science from Trinity College in Dublin Ireland. He has over 100 publications including two books in the areas of ocean engineering wave mechanics and ocean wave energy conversion. He has also edited two books dealing with ocean engineering. In addition he is co-editor of both the journal Ocean Engineering and the Elsevier book series in ocean engineering. Dr. Rameswar Bhattacharyya:is professor of naval architecture at the U.S. Naval Academy where he has served for twenty-six years and adjunct professor of mechanical engineering at The Johns Hopkins University. Prior to joining the Naval Academy faculty he was a faculty member in the Department of Naval Architecture and Marine Engineering at the University of Michigan. His research experience includes ten years at both the Lubecker Flender-Werke and the Hamburg Ship Model Basin in Germany. His research has led to numerous publications including two books one in the area of ship dynamics and the other in the area of computer-aided ship design. Prof. Bhattacharyya received his undergraduate degree in naval architecture from the Indian Institute of Technology and his doctorate in engineering from the Technical University of Hanover Germany. In addition he holds an honorary doctorate from the University of Veracruz. With Prof. McCormick he co

Panels and all other structural components of surface ships and submarines vibrate when the vessel is underway. The vibratory motions are primarily excited by the power plant. At operational (design) speeds, panels vibrate in their fundamental modes and those associated with their higher harmonic frequencies. The panel motions have rather well-defined energy spectra, which depend on both the structural design, position of the panel and the rotational speed of the single or multiple power plants. The panel motions will interact with the vortices in the adjacent turbulent boundary layer. The interaction can result in either an increase in the frictional drag or a decrease. Because of this, the argument is made that the designs of the panels and their support systems should include considerations of this hydroelastic effect.

关键词： Naval architecture

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