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design Automation Conference

作者： J.Y. Lee R.A. Rohrer SRC-CMU Center for Computer Aided Design Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA USA

Asymptotic Waveform Evaluation (AWE) is shown to be effective in the symbolic analysis of linear(ized) circuits. AWEsymbolic efficiently and accurately produces reduced order models of both frequency and time domain behavior of linear(ized) circuits. By use of moment level partitioning, the numeric and symbolic computations are substantially decoupled, hence increasing computation speed. Results for AWEsymbolic showed a marked decrease in execution time as compared to a full AWE analysis, while producing identical results. The use of AWEsymbolic in the frequency domain and in the time domain is illustrated.< >

关键词： Circuit analysis Transfer functions Frequency domain analysis Poles and zeros design automation Circuit analysis computing Reduced order systems Helium Analytical models Circuit simulation

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A parametric design approach for concurrent product development

A parametric design approach for concurrent product developm...

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4th Symposium on Multidisciplinary Analysis and Optimization, 1992

作者： Godse, Mohan M. Haug, Edward J. Choi, Kyung K. C. A. E. Technology Inc. 850 Stephenson Highway Suite 116 TroyMI48083 United States Center For Computer Aided Design Department of Mechanical Engineering The University of Iowa Iowa CityIA52242 United States

The primary goal of this research is to investigate, develop, and demonstrate a parametric design methodology for concurrent design of mechanical systems. In the parametric design methodology, design parameterization is identified as the key to unify the design process. A feature-based solid modeler is used here to define libraries of parameterized geometries for machining and welding manufacturing processes. design as well as manufacturing constraints and attributes are associated with parameterized geometries to effectively communicate information among different disciplines involved in the design process. The parametric design methodology allows to define design classes that can be systematically evaluated during the design process. design sensitivity information from different disciplines is used to assess the impact of design changes on the system as a whole. Finally, what-if studies provide a valuable tool to engineers to make design improvements. Using the parametric design methodology, concurrent design of products can therefore be accomplished. © 1992 by Dr. Mohan Godse.

关键词： Machine design

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AN EFFICIENT SCHEME FOR SIMULATING LARGE, PASSIVE MICROSTRIP LAYOUTS

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INTERNATIONAL JOURNAL OF MICROWAVE AND MILLIMETER-WAVE computer-aided engineering 1992年第4期2卷 253-260页

作者： WU, DI MIMICAD Center Department of Electrical and Computer Engineering University of Colorado Boulder Colorado 80309 From 1980–1983 She was a Member of Technical Staff at Bell Laboratories AT&T Indianpolis. Indian where she was engaged in the study of radio frequency interference. From 1987-1988 she was with the National Institute of Standards and Technology working in the area of field characterization and measurment. Since 1989. she has been a member of the research faculty with the Center for Microwave Computer-Aided Design atthe University of Colorado. Presently she is also the President of Boulder Microwave Technologies Inc. a firm specializing in the development of computer-aided design tools and methodologies for electromagnetics. Her research intetest include CAD antenna radiation scattering and numerical modeling. Dr. Wu is an associate member of URSI Commission B.

An efficient algorithm is presented here for simulating large, passive, microstrip layouts using a circle of influence approach with a full-wave/integral-equation-based numerical solver. The procedure involves dividing the circuit into standard subcomponents or blocks and assigning a circle of influence for each block. Relying on physical intuition, the computation of the couplings between blocks is then limited to those that fall within the circle. By adjusting the circle size, different orders of parasitic coupling can be included in the simulation process. Local junction effects from the individual blocks and the parasitic couplings between blocks that are in close physical proximity can always be taken into account. aided by a newly developed graphical user interface, the tradeoff between computational efficiency and accuracy is examined by varying the diameter of the circle of influence. Data are presented to illustrate the effectiveness of this new approach.

关键词： Microstrip Devices

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FASTER computation OF Z-MATRICES FOR TRIANGULAR SEGMENTS IN PLANAR CIRCUITS

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INTERNATIONAL JOURNAL OF MICROWAVE AND MILLIMETER-WAVE computer-aided engineering 1992年第2期2卷 98-107页

作者： LEE, SH BENALLA, A GUPTA, KC MIMICAD Center Electrical and Computer Engineering Department University of Colorado Boulder Colorado 80309-0425 Abdelaziz Benalla was born in Algeria on May 31 1959. He received the BS degree in Electronics from University of Constantine Algeria in 1982. and the MS and PhD degrees in Electrkal Engineering from the University of Colorado Boulder (UCB) in 1985 and 1989. respectively. Dr. Benalla has worked as a Research Assistant in the Electromagnetic Laboratory (UCB) from 1984 to 1989 on the design of low side-lobe short microstrip linear array antennas. He has developed a computer-aided design and analysis software for these structures. Since May 1989 he has been working at the MIMICAD Center (UCB) as a postdoctoral Research Associate. He has been involved in numerous research projects in developing CAD software for microstrip circuits and antennas. Dr. Benalla's current interest is in the area of computer-aided design and analysis techniques for microwave and millimeter-wave circuits and antenna arrays as well as microwave and milli-meter-wave measurement techniques. Dr. Benalla is a Member of the Institute of Electrical and Electronics Engineering (IEEE). Antennas bt Propagation and Microwave Theory & Technique Societies. He is coeditor of a book entitled Microstrip Antenna Design (Artech House 1988).

The method of images and currently available single-series formulation of a rectangular planar segment have been applied to speed up the computations of impedance matrix elements of 30-degrees-60-degrees-90-degrees and equilateral triangular microstrip segments used in planar microwave circuits. For an equilateral triangular segment, the elements of Z-matrix are obtained by using the results for two 30-degrees-60-degrees-90-degrees triangular segments, one of which has all magnetic walls and, in the other segment, one of the magnetic walls is replaced by an electric wall. The present formulations have been verified by comparison with the previously available double series formulations.

关键词： Mathematical Techniques

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IMPROVING THE SHIP design, ACQUISITION AND CONSTRUCTION PROCESS

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NAVAL ENGINEERS JOURNAL 1992年第2期104卷 39-57页

作者： RYAN, JC JONS, OP J. Christopher Ryan:earned his bachelor's and master's 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 12 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 project manager for the Ship Design Acquisition and Construction Process Improvement Project. Otto P. Jons:received a Diplom Ing. in shipbuilding from the Technical University of Hannover W. Germany and an M.S. in naval architecture and marine engineering from the Massachusetts Institute of Technology in 1967. He then joined Litton Ship Systems where he was responsible for the preliminary design of the DD-963 hull structure and then for ship systems as manager LHA Ship Systems Engineering Department. From 1972 to 1974 he was principal research scientist at Hydronautics. In 1976 as technical director he helped establish the local office of Designers and Planners. Otto Jons was one of the co-founders of Advanced Marine Enterprises Inc. in 1976 where he is corporate vice president engineering.

In the spring of 1990, the NavSea Chief Engineer initiated a project to improve the design, acquisition and construction (DAC) of U.S. Navy ships. The project's objectives are to reduce the time and cost of acquiring and operating Navy ships while improving their quality, unlike previous studies on the subject, the project utilizes a rigorous process analysis approach and attempts to use quantitative measures as the basis for recommending improvements. The paper is, of necessity, a status report on the progress of this project. Topics covered include: the DAC process;a look at the current state of ship acquisition time, cost, and quality;the methodology for process improvements;and early findings.

关键词： Naval Vessels

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THE USE OF PROPULSION SHAFT TORQUE AND SPEED MEASUREMENTS TO IMPROVE THE LIFE-CYCLE PERFORMANCE OF UNITED-STATES NAVAL SHIPS

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NAVAL ENGINEERS JOURNAL 1992年第6期104卷 43-57页

作者： HUNDLEY, LL TSAI, SJ Lowry L. Hundley:is a project manager/instrumentation engineer with the Hydromechanics Department at the Carderock Division Naval Surface Warfare Center. His 25 years of experience include the planning and directing of sea trials on Navy Coast Guard and commercial ships. Mr. Hundley has been responsible for assessing and improving the methods used to collect and analyze ship powering and maneuvering data. He received a B.S. degree in electrical engineering from Virginia Polytechnic Institute in 1967 and is a member of ASNE. Shou-Jen Tsai:is a naval architect with the Full-Scale Trials Branch Ship Hydromechanics Department at Carderock Division Naval Surface Warfare Center. His 20 years of experience include ship repair and computer-aided ship design and performance analysis. He is a licensed marine engineer with 5 years of shipboard operation experience. Mr. Tsai received a B.S. degree in naval architecture from Taiwan Provincial College of Marine and Oceanic Technology in 1970 and a master's degree in ocean engineering from Stevens Institute of Technology in 1980.

This paper describes the benefits of having permanent torsionmeters installed on the main propulsion shafting of U. S. naval ships. Propulsion shaft torque and speed measurements provide ship operators with accurate knowledge of the ship's powering condition at any given time. This information can be compared with baseline data to reveal degradation in the ship's powering performance. Performance trends produced by observations over an extended period of time can be utilized to forecast the point at which corrective action should be taken. The timely implementation of necessary corrective action can significantly decrease the ship's operating cost by reducing fuel consumption while minimizing excessive wear on the ship's machinery and, in all probability, extend the ship's service life. The value of accurate powering measurements is discussed in conjunction with (1) the accumulation and removal of hull and propeller marine growth, (2) single shaft operation, and (3) ships equipped with controllable pitch propellers. An overview of modern torsionmeters is presented based on literally hundreds of sea trials involving personnel from the Carderock Division. Naval Surface Warfare Center. Development of an overall program is suggested to ensure that (1) only accurate and reliable torsionmeters are installed on U. S. naval ships, (2) the meters are properly maintained and monitored, and (3) full utilization is made of the data obtained and of the baseline data currently available.

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AN EFFICIENT ALGORITHM FOR PARAMETRIC FAULT SIMULATION OF MONOLITHIC ICS

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IEEE TRANSACTIONS ON computer-aided design OF INTEGRATED CIRCUITS AND SYSTEMS 1991年第8期10卷 1049-1058页

作者： STROJWAS, AJ DIRECTOR, SW SRC-CMU Center for Computer-Aided Design Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA USA

An efficient methodology for performing fault simulation experiments as a part of an IC failure diagnosis system is described. The basis of this methodology is the use of regression models that relate IC performances directly to process disturbances inherent in all IC fabrication processes. An efficient algorithm for establishing the structure of such models based upon data obtained from coupled process and circuit simulators is developed. This new self-organization algorithm, which has a multilayer structure of Rosenblatt's perceptron type, selects a minimum number of significant input parameters and automatically establishes an optimum order polynomial regression model. The algorithm belongs to the class of the recently fashionable artificial neural network approaches. The algorithm has been implemented in a software tool called MUlti-layer REGression (MULREG), which has been tested successfully on a large number of examples.

关键词： Integrated circuit modeling Circuit faults Circuit simulation Fault diagnosis Fabrication Coupling circuits Polynomials Regression tree analysis Artificial neural networks Multi-layer neural network

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A hybrid integration scheme for simulation of controlled multibody mechanical systems

A hybrid integration scheme for simulation of controlled mul...

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ASME 1991 design Technical Conferences, DETC 1991

作者： Lin, Shih-Tin Lance, George M. Department of Mechanical Engineering Center for Computer Aided Design University of Iowa Iowa CityIA United States

ISBN: (纸本)9780791897768

Simulation of a controlled multibody mechanical system, with a nonstiff mechanical subsystem and a stiff control subsystem, usually suffers from long run time. In this paper, a hybrid integration scheme is proposed to overcome this difficulty. The hybrid integration scheme consists of two parts: a nonstiff integration algorithm for the mechanical subsystem and a. stiff integration algorithm for the control subsystem. A double pendulum driven by two AC motors and a backhoe mechanism driven by three hydraulic actuators are used to demonstrate the computational efficiency of the proposed integration scheme. © 1991 American Society of Mechanical Engineers (ASME). All rights reserved.

关键词： Hydraulic actuators

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REASONING ON THE LOCATION OF COMPONENTS FOR ASSEMBLY PACKAGING

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JOURNAL OF MECHANICAL design 1991年第4期113卷 402-407页

作者： KIM, JJ GOSSARD, DC T. J. Watson Research Center Interactive Geometric Modeling IBM Research Division Yorktown NY 10598 Computer-Aided Design Laboratory Department of Mechanical Engineering Massachusetts Institute of Technology Cambridge MA 02139

The process of locating components in an available space while satisfying spatial relationships among the components is called packaging. The task requires extensive spatial reasoning about geometric shapes. It is a generic design task common to many domains. It is also very time-consuming, especially as machines become more compact and complex. This paper describes progress toward automation of the packaging problem. An approach is proposed to determine the optimal locations of components in an assembly from spatial relationships between the components. The approach utilizes a novel combination of optimization and solid modeling techniques.

关键词： Machinery Optimization Solid modeling Packaging design Shapes Manufacturing

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Pseudoedge: A hierarchical skeletal modeler for the design of structural components

Pseudoedge: A hierarchical skeletal modeler for the design o...

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ASME 1991 design Technical Conferences, DETC 1991

作者： Bonner, David L. Jakiela, Mark J. Watanabe, Masaki Department of Mechanical Engineering Computer-Aided Design Laboratory Massachusetts Institute of Technology CambridgeMA United States Scientific Research Laboratory Central Engineering Laboratories Nissan Motor Company Limited Yokosuka Japan

ISBN: (纸本)9780791897768

A new design model for the creation of mechanical components has been developed. In this model, the shape is expressed by its areas of prominence or maximum curvature, for which we use the term pseudoedges. In terms of traditional design, these represent both fillet, chamfer and intersection lines, and more general shape features. The pseudoedges of the model combine with a skeletal shape that is used as a starting form, thereby creating a hierarchy of geometric dependencies that affords both global and local control. The surface is represented by a quilt of parametric Bezier patches, with tangent plane continuity everywhere and only certain isolated singularities. Considerable degrees of deformation are possible, with predictable control and at small computational expense;there is no need for computation of intersections or parameter space trimming of patches. © 1991 American Society of Mechanical Engineers (ASME). All rights reserved.

关键词： Machine design

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