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Simulation and visualisation of the dynamic behaviour of an overhead power system with contact breaking

VEHICLE SYSTEM DYNAMICS 1996年第1期25卷 31-49页

作者： Yagi, T Stensson, A Hardell, C Department of Mechanics Royal Institute of Technology S-100 44 Stockholm Sweden Division of Computer Aided Design Luleå University of Technology S-971 87 Luleå Sweden

For high speed rail traffic it is necessary to design overhead power systems which minimize the contact loss between pantograph head and contact wire. To predict how different design solutions will behave it is favourable to model and simulate the dynamic behaviour. In this paper a model of an overhead power system is specified and used in simulation. The model is suitable for simulation with contact loss since it includes specifications of impact conditions between pantograph head and contact wire. Two sets of equations of motion are specified, one for the contact case and one for the non-contact case. The model also includes lateral movement of the wire due to the zigzag span and friction between the pantograph head and the contact wire. It is shown how to make animations of the system behaviour using a MCAE-system. The animations are made using a geometrical model of the system together with results from numerical simulations. Through the examples provided, use of the mathematical model and the geometrical model is presented. The response is visualised as time histories and phase plane diagrams of different coordinates and as animations of the total system response. The different types of visualisations make an excellent Combination when studying the system behaviour of different design solutions. In one example, simulation using the linearised set of equations gives the same results as simulation using the set of fully nonlinear equations, due to periodic response and the simple alternation of contact conditions. It is shown that the situation when any of the parameters vary suddenly is possible to simulate using the fully nonlinear equations of motion.

关键词： Overhead lines

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design OF A SELF-CLOSING COMPLIANT "MOUSE TRAP" FOR MICRO ASSEMBLY

DESIGN OF A SELF-CLOSING COMPLIANT "MOUSE TRAP" FOR MICRO AS...

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ASME 1996 International Mechanical Engineering Congress and Exposition, IMECE 1996

作者： Saitou, Kazuhiro Jakiela, Mark J. Computer-Aided Design Laboratory Department of Mechanical Engineering Massachusetts Institute of Technology CambridgeMA United States

ISBN: (纸本)9780791815410

A design of a micro latching fastener - a micro "mouse trap" - is presented, which has self-closing compliant latches that clamp a free planar part inserted between them. The self-closing of the latches is induced by the insertion of the part which releases the potential energy stored in the "cocked" state of the device, in the manner of a mouse trap. The closed latch can re-open by cocking the micro mouse trap. The self-closing action of the micro mouse trap allows the inaccurate insertion of the free part and leads to very accurate final positioning, with the insertion force required to induce the self-closing being very small. The micro mouse trap is also reusable since the release of the clamped part is done non-destructively. The micro mouse trap can be used, for instance, for assembly and temporal clamping/positioning of micro-scale parts, and electromechanical/opto-mechanical connectors. © 1996 American Society of Mechanical Engineers (ASME). All rights reserved.

关键词： Potential energy

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LayDis - An advanced navigation system for electron beam probing

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MICROELECTRONIC ENGINEERING 1996年第1-4期31卷 355-362页

作者： Kuntzsch, C Goldbach, M Wolz, W Fraunhofer Institute of Integrated Circuits FhG IIS-A Department of Applied Electronics Am Weichselgarten 3 91058 Erlangen Germany Tel.: x49 9131 776 443 University of Erlangen-Nürnberg Institute of Computer-Aided Circuit Design Prof. Dr. W. H. Glauert Cauerstr. 6 91058 Erlangen Germany Tel.: x49 9131 858680

This paper presents a new tool set called LayDis providing advanced navigation support for chipinternal probing. Although the tool set has been designed primarily for electron beam test equipment (EBT), it is extendable to support optical beam test equipment, contacting prober stations, focused ion beam stations (FIB), or laser cutters. The new navigation system has got multiple links to the CAD-data, and its main advantage comes from the fact that layout navigation can be performed even if nothing else but layout data (GDS II file) is available. The user is guided by the system through all stages of pre-processing the design data. The software has built-in features for automatic probing point selection based on technology-proprietary selection rules. An unique built-in feature is the full support of layout navigation based on text information contained in a layout file. To support complete netlist-driven navigation for fault localisation purposes a pre-processor is available to use Dracula LVS results for the crossmapping of netlist naming information and layout polygon description. In addition, LayDis is capable of generating and processing probing point list files for the repeated operation of the same verification and measurement tasks. This feature enables the design&Test engineer to verify or characterise several identical devices during the process of 'First Silicon characterisation'.

关键词： Integrated circuit testing

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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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Analysis of nonreciprocal mode-conversion properties of magnetooptic channel waveguides using the finite element method

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ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 1996年第10期79卷 32-39页

作者： Zhuang, XP Koshiba, M Tsuji, Y Faculty of Engineering Hokkaido University Sapporo Japan 060 Graduated from the Department of Communication Engineering Guellin Electronic Institute China in 1986. She received her M.S. degree from Hokkaido University in 1991 and was admitted to the doctoral program. She has been engaged in research on the optimum design of magnetooptic waveguides for nonreciprocal optical devices. Graduated in 1971 from the Department of Electronic Engineering Hokkaido University where he received his M.S. degree in 1973 and his Dr. of Eng. degree in 1976. In 1976 he became a Lecturer in the Department of Electronic Engineering Kitami Institute of Technology where he was promoted to Associate Professor in 1977. In 1979 he became an Associate Professor at Hokkaido University where he was promoted to Professor in 1987. He has been engaged in research on optical and wave electronics. In 1987 he received a Best Paper Award. He is the author ofFundamentals of Finite Element Method of Optics and Waves(Morigkata Publ.)Optical Waveguide Analysis(Asakura Publ.)Optical Waveguide Analysis(McGraw-Hill Book Co.) andOptical Waveguide Theory by the Finite Element Method(KTK Scientific Publishing/Kulwer Academic Publishers). He is also co-author of one book and has written chapters in six other books. He is a member of the Institute of Television Engineers of Japan the Institute of Electrical Engineers of Japan the Japan Society for Simulation Technology the Japan Society for Computational Methods in Engineering and the Japan Society of Applied Magnetics and Mechanics. He is also an IEEE Senior Member. Graduated in 1991 from me Department of Electronic Engineering Hokkaido University where he received his M.S. degree in 1993. He is currently in the doctoral program. He has been engaged in research on quantum wave phenomena and computer-aided design of optical and quantum effect devices.

To evaluate nonreciprocal mode conversion characteristics in a magnetooptic channel waveguide, a finite element analysis based on the scalar wave approximation is formulated for the first time. A simple iterative calculation method is conceived for solution of the nonlinear eigenvalue equations finally obtained in which the two polarizations are coupled. Specifically, the maximum isolation ratio in the mode-conversion-type magnetooptic rib guide was evaluated and the validity of the method is confirmed by comparison with published experimental results.

关键词： nonreciprocal optical devices magnetooptic waveguide nonreciprocal mode conversion finite element method numerical analysis

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A METHOD TO RESOLVE AMBIGUITIES IN CORNER-CORNER INTERACTIONS BETWEEN POLYGONS IN THE CONTEXT OF MOTION SIMULATIONS

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ENGINEERING COMPUTATIONS 1995年第2期12卷 135-144页

作者： KRISHNASAMY, J JAKIELA, MJ Computer Aided Design Lab Department of Mechanical Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA

The motion of systems of polygonal objects is characterized by discontinuities due to changes in the set of contacts between polygons. Effective simulations of such a motion requires a simulation scheme that can automatically update the set of contacts during the simulation. This article focuses on a contact updating problem that arises when a penalty based contact model is used. A penalty based model requires a finite overlap of contacting polygons. This overlap results in ambiguities in characterizing corner-corner contact between polygons. A simple yet effective scheme to overcome such ambiguities is presented.

关键词： CONTACT UPDATING CORNER-CORNER CONTACT

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A finite-element beam-propagation method for strongly guiding optical waveguides with magnetooptic materials

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ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 1996年第7期79卷 22-29页

作者： Tsuji, Y Koshiba, M Tanabe, T Faculty of Engineering Hokkaido University Sapporo Japan 060 Graduated in 1991 from the Department of Electronic Engineering Hokkaido University and received his M.S. degree in 1993. He is currently working toward a doctoral degree. He has been engaged in research on the computer-aided design of optical and quantum-wave phenomena and quantum-effect devices. Graduated in 1971 from the Department of Electronic Engineering Hokkaido University and received his M.S. and Dr. of Eng. degree in 1973 and 1976 respectively. In 1976 he became a Lecturer at Kitami Institute of Technology where he was promoted to an Associate Professor in 1977. In 1979 he became an Associate Professor in the Department of Electronic Engineering Hokkaido University where he was promoted to Professor in 1987. He has been engaged in research on opto- and wave-electronics. In 1987 he received a Best Paper Award. He is the author ofFoundations of Finite Element Method for Opto- and Wave-Electronics(Morikita Publ.)Optical Waveguide Analysis(Asakura Publ.)Optical Waveguide Analysis(McGraw-Hill Book Co.) andOptical Waveguide Theory by the Finite Element Method(KTK Scientific Publishers/Kluwer Academic Publishers). He has co-authored one book and written Graduated in 1995 from the Department of Electronic Engineering Hokkaido University and is currently in the Master's program. He has been engaged in research on opto- and wave-electronics.

To the best of the knowledge of the authors, the formulation is carried out for the first time on the finite-element beam-propagation method for the analysis of the magnetooptic waveguide in which the structure varies along the propagation direction. The present method is applicable not only to the case in which refractive index difference is small but also to the case for the TE mode and the TM mode propagating in a waveguide with a large refractive index difference. To suppress the spurious reflection from the computational window edges, the transparent boundary condition is applied.

关键词： seam-propagation method finite-element method magnetooptical material optical isolator

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Variance of quantization error at the output of recursive digital filter

Variance of quantization error at the output of recursive di...

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URSI International Symposium on Signals, Systems, and Electronics (ISSSE)

作者： G. Mollova Department of Computer Aided Design Higher Institute of Architecture & Civil Engineering Sofia Bulgaria

A new analytical expression for the variance of resulting quantization error at the output of a recursive cascade filter is proposed. The final results are given according to the filter's type and its order (even or odd). A design methodology for optimal recursive filters with minimum resulting error is presented aimed also to facilitate the computational process. A detailed numerical example is given, too.

关键词： Quantization Digital filters Chebyshev approximation Transfer functions Analysis of variance Circuits Civil engineering design methodology Dynamic programming Minimax techniques

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Automated Optimal design of Mechanical Conformational Switches

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Artificial Life 1995年第2期2卷 129-156页

作者： Kazuhiro Saitou Mark J. Jakiela Computer-Aided Design Laboratory Department of Mechanical Engineering Massachusetts Institute of Technology 77 Massachusetts Avenue Room 3-46la Cambridge MA 02139 USA. kazu@mit.edu Computer-Aided Design Laboratory Department of Mechanical Engineering Massachusetts Institute of Technology 77 Massachusetts Avenue Room 3-46la Cambridge MA 02139 USA. jakiela@mit.edu

Bacteriophage viruses spontaneously self-assemble in the presence of their component parts (certain protein molecules). It is believed that conformational switches, interacting chemical bonding sites that allow tentative incorrect bonds, facilitate this randomized assembly process. A one-dimensional conformational switch is proposed and used to study the randomized assembly of mechanical parts. A genetic algorithm is used to search the space of parameterized switch designs to maximize the rate of a desired assembly.

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NEURAL-NETWORK APPROACH TO THE SOLUTION OF LINEAR COMPLEMENTARITY-PROBLEMS

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INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 1995年第6期8卷 431-445页

作者： OSOWSKI, S Institute of the Theory of Electrical Engineering and Electrical Measurements Technical University Warsaw Poland Stanislaw Osowski was born in Poland in 1948. He received the Dipl. Ing. Dr. Ing. and Dr Ing. Habil. degrees from the Technical University of Warsaw Poland in 1972 1975 and 1981 respectively all in electrical engineering. At present he is a professor at the Institue of Theory of Electrical Engineering and Electrical Measurements Technical University of Warsaw. His research and teaching interests are in the area of neural networks optimization techniques and computer-aided circuit analysis and design.

The paper presents the application of nonlinear neural optimization networks to solve the linear complementarity problem. Two different approaches are presented and investigated: one leading to linear and the second t... 详细信息

关键词： Neural networks

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