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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： P. Agathoklis E.I. Jury M. Mansour Department of Electrical and Computer Engineering University of Victoria Victoria Canada Department of Electrical Engineering University of Miami Coral Gables FL USA Institute of Automatic Control and Industrial Electronics Swiss Federal Institute of Technology Zurich Switzerland

Algebraic necessary and sufficient conditions for the stability analysis of 2-D discrete systems are presented. These conditions are developed based on the frequency-dependent formulation of the Lyapunov equation using Kronecker products. It is shown that these necessary and sufficient conditions for internal stability of 2-D discrete systems are equivalent to testing the eigenvalues of constant matrices. This is a simplification over earlier tests which require testing the positivity of one or more functions of omega for all omega epsilon (0,2 pi ).< >

关键词： Sufficient conditions Equations System testing Eigenvalues and eigenfunctions Polynomials Frequency dependence Automatic control Industrial electronics Stability analysis

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The importance of bounded real and positive real functions in the stability analysis of 2-D system

The importance of bounded real and positive real functions i...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： P. Agathoklis E.I. Jury M. Mansour Department of Electrical and Computer Engineering University of Victoria Victoria BC Canada Department of Electrical Engineering University of Miami Coral Gables FL USA Institute of Automatic Control and Industrial Electronics Swiss Federal Institute of Technology Zurich Switzerland

The necessary and sufficient conditions for the existence of positive definite solutions for the 2-D Lyapunov equation for 2-D discrete, 2-D continuous, and differential-delay systems are presented. It is shown that these conditions are related to the strictly positive real and strictly bounded real conditions. The relationship between these conditions and the stability ones is also discussed.< >

关键词： Stability analysis Equations Polynomials Testing Continuous time systems Sufficient conditions Automatic control Industrial electronics State-space methods Delay systems

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Extreme Point Results for Robust Stabilization of Interval Plants with First Order Compensators

Extreme Point Results for Robust Stabilization of Interval P...

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American control Conference (ACC)

作者： C. V. Hollot F. J. Kraus R. Tempo B. R. Barmish Department of Electrical and Computer Engineering University of Massachusetts Amherst MA USA Institute of Automatic Control and Industrial Electronics Swiss Federal Institute of Technology Zurich Switzerland Politecnico di Torino CENS-CNR Torino Italy Department of Electrical and Computer Engineering University of Wisconsin Madison Madison WI USA

It has recently been shown that a first order compensator robustly stabilizes an interval plant family if and only if it stabilizes all of the extreme plants. That is, if the plant is described by m-th order numerator and monic n-th order denominator with coefficients lying in prescribed intervals, it is necessary and sufficient to stabilize the set of 2 m+n+l extreme plants. These extreme plants are obtained by considering all possible combinations for the extreme values of the numerator and denominator coefficients. In this paper, we prove a stronger result. Namely, it is necessary and sufficient to stabilize only sixteen of the extreme plants. These sixteen plants are generated using the Kharitonov polynomials associated with the numerator and denominator. Furthermore, when additional apriori information about the compensator is specified (sign of the gain and signs and relative magnitudes of the pole and zero), then in some cases, it is necessary and sufficient to stabilize eight critical plants while in other cases, it is necessary and sufficient to stabilize twelve critical plants.

关键词： Robustness Polynomials Robust control Poles and zeros Robust stability Feedback control control system synthesis Automatic control Industrial electronics computer graphics

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computer-SYSTEM ARCHITECTURE CONCEPTS FOR FUTURE COMBAT SYSTEMS

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NAVAL ENGINEERS JOURNAL 1990年第3期102卷 43-62页

作者： ZITZMAN, LH FALATKO, SM PAPACH, JL Dr. Lewis H. Zitzman:is the group supervisor of the Advanced Systems Design Group Fleet Systems Department The Johns Hopkins University Applied Physics Laboratory (JHU/APL). He has been employed at JHU/APL since 1972 performing applied research in computer science and in investigating and applying advanced computer technologies to Navy shipboard systems. He is currently chairman of Aegis Computer Architecture Data Bus and Fiber Optics Working Group from which many concepts for this paper were generated. Dr. Zitzman received his B.S. degree in physics from Brigham Young University in 1963 and his M.S. and Ph.D. degrees in physics from the University of Illinois in 1967 and 1972 respectively. Stephen M. Falatko:was a senior engineering analyst in the Combat Systems Engineering Department Comptek Research Incorporated for the majority of this effort. He is currently employed at ManTech Services Corporation. During his eight-year career first at The Johns Hopkins University Applied Physics Laboratory and currently with ManTech Mr. Falatko's work has centered around the development of requirements and specifications for future Navy systems and the application of advanced technology to Navy command and control systems. He is a member of both the Computer Architecture Fiber Optics and Data Bus Working Group and the Aegis Fiber Optics Working Group. Mr. Falatko received his B.S. degree in aerospace engineering with high distinction from the University of Virginia in 1982 and his M.S. degree in applied physics from The Johns Hopkins University in 1985. Mr. Falatko is a member of Tau Beta Pi Sigma Gamma Tau the American Society of Naval Engineers and the U.S. Naval Institute. Janet L. Papach:is a section leader and senior engineering analyst in the Combat Systems Engineering Department Comptek Research Incorporated. She has ten years' experience as an analyst supporting NavSea Spa War and the U.S. Department of State. She currently participates in working group efforts under Aegis Combat System Doctrin

This paper sets forth computer systems architecture concepts for the combat system of the 2010–2030 timeframe that satisfy the needs of the next generation of surface combatants. It builds upon the current Aegis computer systems architecture, expanding that architecture while preserving, and adhering to, the Aegis fundamental principle of thorough systems engineering, dedicated to maintaining a well integrated, highly reliable, and easily operable combat system. The implementation of these proposed computer systems concepts in a coherent architecture would support the future battle force capable combat system and allow the expansion necessary to accommodate evolutionary changes in both the threat environment and the technology then available to effectively counter that threat. Changes to the current Aegis computer architecture must be carefully and effectively managed such that the fleet will retain its combat readiness capability at all times. This paper describes a possible transition approach for evolving the current Aegis computer architecture to a general architecture for the future. The proposed computer systems architecture concepts encompass the use of combinations of physically distributed, microprocessor-based computers, collocated with the equipment they support or embedded within the equipment itself. They draw heavily on widely used and available industry standards, including instruction set architectures (ISAs), backplane busses, microprocessors, computer programming languages and development environments, and local area networks (LANs). In this proposal, LANs, based on fiber optics, will provide the interconnection to support system expandability, redundancy, and higher data throughput rates. A system of cross connected LANs will support a high level of combat system integration, spanning the major warfare areas, and will facilitate the coordination and development of a coherent multi-warfare tactical picture supporting the future combatant command st

关键词： computer Architecture

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AN AIR-CAPABLE COMBATANT FOR THE 21ST-CENTURY

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NAVAL ENGINEERS JOURNAL 1990年第3期102卷 240-252页

作者： KEHOE, JW BROWER, KS MEIER, HA Capt. James W. Kehoe USN (Ret.):is well known for his work in comparative naval architectural studies of U.S. and foreign warship design practices for which he received the American Society of Naval Engineer's Gold Medal Award for 1981. His naval career which he began as an aviation electronics technician included duty aboard three aircraft carriers and three destroyers including engineer officer of theWasp(CVS-18) and commanding officer of theJohn R. Pierce(DD-753). He is a partner in Spectrum Associates Inc. Springfield Virginia. Kenneth S. Brower:is a partner in Spectrum Associates Inc. a naval engineering firm which he founded in 1978. He is engaged in the design of naval ships comparative naval architecture studies and the development of ship design synthesis computer programs. A graduate in naval architecture from the University of Michigan he has contributed to the design of numerous naval and merchant ships including several types of air-capable ships. He received the ASNE “Jimmie” Hamilton Award for 1983. Herbert A. Meier:worked as a naval architect for the U.S. Navy in the offices responsible for the conceptual and preliminary design of aircraft carriers and other warships from 1951 to 1976. During this period he worked on the design of aircraft carriers beginning with theForrestal(CVA-59). He was the project naval architect for theNimitz(CVAN-68) and the Sea Control Ship (SCS). The SCS was a small aircraft carrier which was intended to operate VSTOL aircraft and helicopters.

During the next decade, the force structure of the U.S. Navy will be in flux, as it reacts to changing political relationships, advancing technology, and declining resources. Newly developed vertical takeoff and landing (VTOL) aircraft, such as the V-22 Osprey and AV-8B Harrier, offer the U.S. Navy an air capability for its future battle force combatants that needs to be explored. What would a battle force combatant with a detachment of six VTOL aircraft and a destroyer combat suite like the ODG-51's resemble? Can such a ship be designed within reasonable size and cost limits? We conducted a feasibility design study of alternative concepts to determine the smallest, minimum cost, lowest risk, air-capable battle force combatant capable of conducting operations in the 21st century. The paper discusses the evolution of the design, including alternative ship, hangar, and elevator configurations. It also describes the development of the light ship weights and vertical centers of gravity, deck area and volume, electrical power, and hull form. In addition, the paper covers the process we used to develop the design, including the use of advanced technologies, such as integrated electric propulsion.

关键词： Warships

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User interface standards for control system design applications

User interface standards for control system design applicati...

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IEEE International Symposium on computer Aided control System Design (CACSD)

作者： H.A. Barker M. Chen I.T. Harvey P.W. Grant C.P. Jobling A. Parkman P. Townsend Control and Computer Aided Engineering Research Group Departments of Electrical and Electronic Engineering and Mathematics and Computer Science University College of Swansea University of Wales Swansea UK

Aspects of the design and specification of a generic graphical user interface for control system design and the emerging standards for user interface implementation that underlie it are discussed. The use of this interface in future design environments should permit the rapid development of novel design methods and at the same time, by enforcing a consistent look and feel across applications, make the transfer of new knowledge much simpler than is possible at present. A brief history of computer-aided control system design (CACSD) is given. Advantages of sophisticated graphical user interfaces and standards for user interface development are discussed. A description of how an existing CACSD package has been redesigned to take on board the latest user interface technology is included.< >

关键词： User interfaces control systems Packaging History Power engineering and energy computer graphics Workstations computer interfaces Application software Design engineering

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Printed circuit board inspection system PI/1 2

Printed circuit board inspection system PI/1

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Automated Inspection and High-Speed Vision Architectures II 1988

作者： Yu, Shiaw-Shian Cheng, Wen-Chin Chiang, Chris S. C. Advanced Technology Center Electronics Research and Service Organization Industrial Technology Research Institute Chutung Hsinchu31015 Taiwan Control System Department Electronics Research and Service Organization Industrial Technology Research Institute Chutung Hsinchu31015 Taiwan Institute of Computer Science and Information Engineering National Chiao Tung University Hsinchu30049 Taiwan AITech International Corporation United States

An automatic printed circuit board (PCB) inspection system called PI/l, is described in this paper. The system can inspect PCB artwork and inner layers to find trace faults such as open circuits, short circuits, pin holes, fine lines and narrow line spaces. PI/1 uses a line scan camera with 1024 pixels resolution to take images. The whole image can be obtained by the help of a scanning mechanism in the X and the Y directions. Continuous pictures can be taken without blurring, and the resolution is between 1/2 to 2 mils. The inspection method used in PI/1 is a type of design rule checking. It does not require a reference image and can tolerate changes in the inspection environment due to illumination and PCB positioning. The inspection algorithm has been implemented into a special hardware and the inspection speed is about 4 x 106 pixels/sec. © 1989 SPIE. All rights reserved.

关键词： Printed circuit boards

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On the necessary and sufficient conditions for the very strict Hurwitz property of a 2-D characteristic polynomial

On the necessary and sufficient conditions for the very stri...

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IEEE International Symposium on Circuits and Systems (ISCAS)

Necessary and sufficient conditions for the bivariate characteristic polynomial of a matrix to be a very strict Hurwitz polynomial (VSHP) are presented. These conditions are based on solving the Lyapunov equation for 2-D continuous systems using the Kronecker product and lead a simple test for the VSHP property. It requires testing only the eigenvalues of three stable matrices, which is simpler than the existing polynomial tests.< >

关键词： Sufficient conditions Polynomials Equations Continuous time systems Stability analysis Eigenvalues and eigenfunctions System testing Frequency domain analysis Frequency dependence Automatic control

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STANDARD HARDWARE ACQUISITION AND RELIABILITY PROGRAM - CONCEPTS, BENEFITS, AND POTENTIAL

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NAVAL ENGINEERS JOURNAL 1989年第3期101卷 231-239页

作者： WEAVER, LW The author:is a program manager with Naval Weapons Support Center Crane Indiana. Mr. Weaver graduated from Indiana State University in 1969 where he received a B.S. degree with a mathematics major and a minor in physics. He began his career with the Naval Weapons Support Center in 1969 where he worked as a physicist and as an electronics engineer before entering various management positions. In the past ten years he has provided engineering and technical support to fleet ballistic missile guidance programs and to Navy standard computer and standard signal processor programs. He recently completed an assignment as manager of an electronics systems development division with responsibility for development of electronic control systems for fleet applications using standard electronic modules. Currently he is the program manager for the Standard Hardware Acquisition and Reliability Program (SHARP) managed through the Naval Sea Systems Command Sea-06. He is a member of the American Society of Naval Engineers and the Federal Managers Association.

The Standard Hardware Acquisition and Reliability Program (SHARP) includes three major categories of hardware standards. They are Standard Electronic Modules (SEM), Standard Power Supplies (SPS), and Standard Electronic Enclosures (SES). SHARP responsibilities include development and testing of these standards and their integration into electronic systems. The purpose of SHARP is to reduce development, production, and logistics support costs of electronic systems; to improve system operational availability; and to shorten the system acquisition cycle. The basic concepts applied towards this purpose are: functional standardization; functional specification; a disciplined quality program; design flexibility; and emphasis on design for maintenance and repair. The paper describes the application of these concepts in the SHARP program and how they result in: — improved performance and supportability; — multisystem application of functional standards: — standard interfaces between system elements; — competitive procurement of hardware; — improved system readiness; — interchangeability of spares; — introduction of new technology into deployed systems; — improved testability; and — reduced cost to the Department of Defense (DoD). SHARP experience and benefits to the user are described, including specific applications of SHARP hardware in DoD systems and examples of multimillion dollar cost savings to these systems. The status of current SHARP initiatives and potential savings through broader application of SHARP in system developments are then discussed.

关键词： computer Hardware

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Indirect Adaptive control: An Integrated Approach

Indirect Adaptive Control: An Integrated Approach

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American control Conference (ACC)

作者： Graham C. Goodwin Mario E. Salgado Richard H. Middleton Department of Electronics Engineering A.I.S.S.M.S College of Engineering University of Pune India Centre for Industrial Control Science Department of Electrical and Computer Engineering University of Newcastle N.S.W. 2308 Australia.

The aim of this paper is to present the basis of the adaptive control approach being pursued in the Centre for Industrial control Science at the University of Newcastle. A key feature of this approach is the separate optimization of procedures for estimation and on-line control law synthesis. Regarding the estimation module, attention is given to such features as data filtering, the response of the estimator, techniques for handling unmodelled dynamics and the question of numerical accuracy. Regarding the control law synthesis module, attention is given to robustness to unstructured modelling errors, disturbance and set-point feedforward techniques and implementation issues. In the paper, these various aspects are illustrated by reference to a case study problem proposed by Mike Master and Herb Cohn from Texas Instruments.

关键词： Adaptive control Programmable control control systems Sampling methods Filtering Robust control Error correction Instruments Electrical equipment industry Industrial control

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