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IEEE Conference on Decision and control

作者： M.S. Branicky Laboratory for Information and Decision Systems Department of Electrical Engineering and Computer Science Center for Intelligent Control Systems Massachusetts Institute of Technology USA

This paper outlines some preliminary work on the stability analysis of switched and hybrid systems. The hybrid systems considered are those that combine continuous dynamics, represented by differential or difference equations, with finite dynamics usually thought of as being a finite automaton. Here, we concentrate on the continuous dynamics and model the finite dynamics as switching among finitely many continuous systems. We introduce multiple Lyapunov functions as a tool for analyzing Lyapunov stability of such "switched systems". We use iterated function systems theory as a tool for Lagrange stability. We also discuss the case where the switched systems are indexed by an arbitrary compact set.< >

关键词： Stability Switched systems Difference equations Differential equations Automata Lyapunov method Intelligent control Lagrangian functions control systems Laboratories

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Stochastic interpretation of H/sub /spl infin// and robust estimation

Stochastic interpretation of H/sub /spl infin// and robust e...

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IEEE Conference on Decision and control

作者： R.S. Mangoubi B.D. Appleby G.C. Verghese Control and Decision Systems Division C. S. Draper Laboratory and Aeronautics and Astronautics Control and Decision Systems Division C. S. Draper Laboratory Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology USA

H/sub /spl infin// and robust estimation methods are discussed from a deterministic as well as a stochastic point of view. The relationship between H/sub /spl infin// and risk sensitivity for systems with known plant dynamics is reviewed. This relationship is extended to the more general case of estimators that are robust to noise and plant model uncertainties. Specifically, it is shown that a stochastic equivalent to the robust H/sub /spl infin// estimator exists. An example is used to compare the estimators in the deterministic sense, using the frequency response of the transfer function between the inputs and the error, as well as in the stochastic sense, using the probability density function of the output error residual.< >

关键词： Stochastic processes Robustness Estimation error Aerodynamics State estimation Extraterrestrial measurements Noise measurement Minimax techniques Riccati equations Stochastic systems

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ACQUISITION REFORM AND BEST PRODUCT PROCUREMENT - AN engineering VIEW

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NAVAL ENGINEERS JOURNAL 1994年第6期106卷 41-57页

作者： FISHER, DA SKOLNICK, A He has been involved with several weapon system developments. Among these were the Trident II fire control and navigation systems the BSY-I Anti-Submarine Warfare System and the Navy standard computers (UYK44 and EMSP). He served as manager of the Digital Circuits Engineering Branch and was then appointed as manager of the Automatic Test Equipment (ATE) Technology Division. As manager of the ATE Technology Division he was responsible for the SP-23 Fire Control System Support Project the SP-24 Navigation Project and the Fleet Progressive Maintenance Program (2M/ATE). This Division was responsible for selection and application of electronic product technology and for developing fleet test and repair techniques. He holds a B.S. in Electrical Engineering from the University of Evansville and is currently pursuing a Masters of Public Administration at Indiana University-Purdue University Indianapolis. Dr. Alfred Skolnick:retired from the Navy in 1983 with the rank of captain. He is president of System Science Consultants (SSC) specializing in strategic planning technical program definition technology assessment and engineering analyses on selected matters of national interest. Dr. Skolnick taught mathematics and management sciences at University of Virginia and Marymount University. He is adjunct faculty at Northern Virginia Community College. From 1985 to 1989 he was president of the American Society of Naval Engineers. In the Navy he served at Applied Physics Laboratory/The Johns Hopkins University then aboard USSBoston(CAG-1) and played leading roles in several weapon system developments inertial navigation (Polaris) deep submergence (DSRV) and advanced ship designs (SES). He later was director Combat System Integration Naval Sea Systems Command and head Combat Projects Naval Ship Engineering Center. In 1975 he became a major project manager and led the Navy's High Energy Lasers Program in 1981 he was assigned all Navy Directed Energy Weapons development efforts. He was vice president advanced tech

The military services are being moved in the direction of performance-based specifications and standards. They are being steered against dictating ''how to'' produce an item since such action forecloses on the ability to gain access to components or technology that may have a commercial equivalent. Why should the engineering community embrace the new approach? Aside from the obvious weight of it being approved policy, therefore currently mandated, it warrants examination because it is the correct approach at this time when applied to appropriate products. Military specifications and standards are to be displaced then, by acceptable alternative contractor design solutions. Industry bidders will be allowed to propose the particular design details, permitting procurement flexibility by contractually citing only system level or interface requirements, both physical and functional. Hopefully, this can broaden the industrial base and increase competition with reduced costs to follow. Conceptually, the approach appears both performance-sensible and cost-attractive (there are, of course, consequent risks) but how does implementation proceed? Is it possible to pursue the goals envisioned along paths that are not in themselves experimental? Can the American postulate, minimal loss of life and limb to U.S. military people, continue to be honored? Experience and track record elsewhere imply encouraging possibilities in select situations-useful prospects are identified and discussed in practical terms.

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Robust Pole Placement Using Two-Pole Dominant Models

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IFAC Proceedings Volumes 1993年第2期26卷 9-13页

作者： P. Padmanabhan C.V. Hollot W. Siegl Department of Electrical and Computer Engineering University of Massachusetts Amherst MA 01003 USA Automatic Control Laboratory Swiss Federal Institute of Technology ETH-Zürich CH-8092 Zürich Switzerland

In this paper, we consider the problem of robust pole placement using fixed-order compensation. It is assumed that the coefficients of the numerator and denominator polynomials of the uncertain plant depend muitilinearly on the "parameters" and that the design specifications are given in the form of a two-pole dominant model. We present a design methodology for choosing a fixed-order compensator which ensures that all the roots of the closed loop polynomial lie in the regions prescribed by the two-pole dominant model.

关键词： Uncertain Plant Robust Pole Placement Two-Pole Dominant Model

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New Vertex Results in Establishing the Strictly Positive Realness of Weighted Interval Systems

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IFAC Proceedings Volumes 1993年第2期26卷 329-334页

作者： C.V. Hollot L. Guzzella R. Tempo F. Kraus M. Mansour Department of Electrical and Computer Engineering University of Massachusetts Amherst MA 01003 USA Automatic Control Laboratory Swiss Federal Institute of Technology ETH-Zürich CH-8092 Zürich Switzerland CENS-CNR Politecnico di Torino Corso Duca degli Abruzzi 24 10129 Torino Italy

For a given plant transfer function P ( s ) and cone size k, solutions to versions of the absolute stability problem boil down to finding a SPR multiplier Z ( s ) such that [ k ¯ - 1 + P ( s ) ] Z ( s ) is SPR. In this paper, we consider an interval plant P ( s , q , r ) and prove that first order multiplierslead to vertex results when establishing the positive realnells of [ k ¯ - 1 + P ( s , q , r ) ] Z ( s ) . Additionally, we give an example of a second order multiplier and interval plant which fails to have this vertex property. These new results are then applied to the problem of robust stability of time-varying interval systems.

关键词： Vertex Results Strictly Positive Realness Weighted Interval Systems

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EXPLICIT SOLUTION TO THE SINGULAR LQ REGULATION PROBLEM

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IEEE TRANSACTIONS ON automatic control 1992年第5期37卷 633-636页

作者： PENG, YB KINNAERT, M Department of Automatic Control and Computer Engineering Huazhong University of Science and Technology WUHAN China Laboratoire d'Automatique Universite Libre de Bruxelles Brussels Belgium

In this note, an explicit solution to the multivariable discrete linear quadratic (LQ) regulation problem is obtained in the limiting singular case where the input weighting matrix tends to zero. Such a solution follows from a suitable spectral factorization of the input spectrum density matrix under the assumption that the system is stabilizable and detectable, and its transfer function matrix is a full rank. The suitable spectral factor is shown to be the product of the system minimum-phase image and its unitary interactor matrix. The unitary interactor matrix defined here is a special case of the nilpotent interactor matrix defined in [5].

关键词： State feedback Covariance matrix Transfer functions Filters Riccati equations Poles and zeros Virtual manufacturing Programmable control Adaptive control automatic control

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Hybrid state analysis method in stochastic Petri nets

Hybrid state analysis method in stochastic Petri nets

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IEEE International Conference on Systems, Man and Cybernetics

作者： Z. Huang J. Wang M. Zhou Department of Automatic Control East China University of Science and Technology Nanjing China Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark USA

The authors consider the analysis of stochastic Petri net models with generally distributed transition firing times. A so-called hybrid state analysis method is developed. The basic idea is to make the extended state, i.e., the hybrid state, which is composed of a marking and the enabling times of enabled transitions under the marking, propagate as a Markov process by the inclusion of supplementary variables. The recursive equation of hybrid state density functions is given.< >

关键词： Stochastic processes Petri nets Delay Markov processes Equations Density functional theory Stochastic systems Discrete event systems Fires Performance analysis

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Finding the Deregulated Prices by Multiperson Decision Making with Multiobjectives (M 2 D) Approach

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IFAC Proceedings Volumes 1992年第16期25卷 99-103页

作者： Y.S. Rahimov Lei Ming Feng Shan Laboratory of Mathematical Problems of Systems Analysis Baku State University Russia Department of Automatic Control Engineering Huazhong University of Science and Technology Wuhan Hubei 430074 PRC

In this paper we develop a concept framework for production planning based on decentralized decision *** industry *** to finding the deregulated prices by multiobjectives approach has been *** existence and uniqueness of the problem solution are shown. The solution is reached through an “edge incident” algorithm. In *** implemented software has been inserted into the method base of our interactive M 2 D *** applied it successfully for the determination of the sectoral price vectors.

关键词： Deregulated Price Multiple Objective Linear Programming Edge Incident Algorithm

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A Fuzzy Inference Approach to Failure Diagnosis of Adaptive controlled Systems

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IFAC Proceedings Volumes 1991年第3期24卷 657-662页

作者： K. Kumamaru S. Sagara A. Nakai T. Söderström Department of Control Systems Engineering Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Fukuoka Iizuka 820 Japan Department of Electrical Engineering Faculty of Engineering Kyushu University Fukuoka Hakozaki 812 Japan Department of Automatic Control and Systems Analysis Institute of Technology Uppsala University P.O. Box 27 Uppsala Sweden

An on-line scheme to failure diagnosis is proposed for dynamic systems under adaptive control, which is designed based on a direct approach to self-tuning regulator. Failure modes occurred in the system are assumed to be described by unexpected changes in physical parameters of the system. The parameter changes in the controlled system can effectively be detected by using Kullback Discrimination Information (KDI) as an index for model discrimination. In order to decide whether the detected system parameter change is caused by a failure or not, a fuzzy inference approach to failure decision is considered. Some appropriate membership functions which describe fuzzy events of failures are constructed to perform the fuzzy inference. In this way, useful knowledge about failure modes which is available from, e.g., experts can be introduced into the model- based diagnosis technique. Simulation studies of a second-order damped oscillator have been carried out to demonstrate the effectiveness of the method.

关键词： Adaptive control failure diagnosis fuzzy inference Kullback discrimination information parameter estimation

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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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