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American control Conference (ACC)

作者： Charles E. Rohrs Gunter Stein Karl J. Astrom TelLaboratories Research Laboratory South Bend IN and Department of Electrical Engineering University of Notre Dame Notre Dame IN USA Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA USA Systems and Research Center Honeywell Inc. Minneapolis MN USA Department of Automatic Control Lund Institute of Technology Lund Sweden

In this paper, two theorems are quoted which, when applied together, provide much information about the robustness of adaptive control schemes. From these two theorems, another theorem is developed which can explain why adaptive controllers can perform robustly in certain practical situations, while possibly failing in other situations. In particular, if the bandwidth constraints on a control systems are lenient enough to allow the use of a sampling frequency which is smaller than the frequency at which unstructured uncertainty becomes significant, an adaptive controller can behave robustly. Many, if not all, of the applications of adaptive control which have been successful employ relatively slow sampling of the process. Thus, the results of this paper provide a theoretical explanation of how certain adaptive controllers are performing robustly in practice. In addition, the final theorem is of a form which provides insight into what a priori knowledge is required to achieve robust adaptive control and how this knowledge say be used.

关键词： Robust control Adaptive control Uncertainty Frequency Sampling methods Programmable control control systems Transfer functions automatic control Bandwidth

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Uncertainty in Sampled systems

Uncertainty in Sampled Systems

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American control Conference (ACC)

作者： Charles E. Rohrs Gunter Stein Karl J. Astrom Department of Electrical Engineering University of Notre Dame Notre Dame IN USA Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA USA Systems and Research Center Honeywell Inc. Minneapolis MN USA Department of Automatic Control Lund Institute of Technology Lund Sweden

The recently obtained evidence of the need for a positive real element in an adaptive system leaves us with a disturbing gap in adaptive control theory. It is a fact that in some applications adaptive controllers are performing well in practice. How can these systems behave well in practical situations which must contain modeling error? This paper introduces a preliminary result which indicates that it may be possible to maintain the needed positive real system in the presence of modeling error. The result shows that if a continuous-time system with large high frequency uncertainty is treated appropriately with antialiasing filters and sampled slowly enough, the resulting discrete-time system may contain very little uncertainty. With small enough uncertainty in the plant, a positive real system in the adaptive loop is possible.

关键词： Uncertainty Adaptive control Adaptive systems Programmable control Filters Stability Sampling methods Frequency response Adaptive algorithm Sampled data systems

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ADVANCES IN LONG-RANGE, HIGH-SPEED OPTICAL COMMUNICATION

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NAVAL ENGINEERS JOURNAL 1981年第4期93卷 39-48页

作者： BARTON, GG FELDMAN, S Mr. Sidney Feldman formerly with the Naval Applied Science Laboratory is presently with the Radiation Division of the Naval Surface Weapons Center White Oak Silver Spring Maryland. He planned and supervised laboratory experiments of many optical systems for fleet evaluation several of his designs now being standard in the fleet. He received his BA degree in Physics from Brooklyn College in 1941 and majored in Physics at the Brooklyn Polytechnic Institute. His professional memberships include the Optical Society of America American Association for the Advancement of Science and The Scientific Research Society of North America. He was the recipient of the Naval Ordnance Development Award in 1945 the Superior Achievement Award in 1957 the Quality Salary Increase Award in 1965 the Superior Accomplishment Award in 1967 1970 and 1979. Additionally he has been granted patents for a relamping tool for searchlights (1962) a lamp positioning mechanism for searchlights (1963) a daylnight digital sextant (1973) a portable sextant-computer system (1974) and with Mr. George Barton the remote-controlled LLLTV camera-sextant (1976) the automatic passive LLLTV-rangefinder (1977) and a patent disclosure for the omnidirectional transceiver (1980). Mr. George G. Barton has been employed by the Naval Research Laboratory Washington D. C. for the past ten years in the scientific and military application design engineering and fabrication of low light level TV camera systems. He was previously associated with the Smithsonian Institution and Northwestern University in the application of TV technology in astronomical investigations. He attended New York University Newark College of Engineering and New Mexico State University where he majored in Physical Optics. Presently he is with his own company BISMARC Inc. Harker's Island N.C. where he is involved principally in the design manufacture and marketing of sonar systems such as the unique VIDISEA fishscope research and development in electrooptic systems an

During periods of radio silence under Emission control, communication depends on the slow ship-to-ship, manual-visual, 8-10 wpm Morse code signaling shutter searchlight employing the ac 1000-watt incandescent or the ac 1000-watt compact arc mercury-xenon lamp. These sources can be replaced by the dc compact arc xenon lamp to provide longer daylight ranges and highspeed (100 wpm teletype, 150 wpm Morse code, voice, etc.) communication since this source has superior brightness and the facility of considerably more rapid modulation. The excessive weight and size of the ac-dc power convertor and modulating circuitry which had prevented use of the dc xenon lamp have been overcome by developments in solid state electronics such as the rapid, high current, simmer-flash, 100 to one light output xenon lamp pulsing using the reliable, uncomplicated, low-cost silicon controlled rectifier shunt switch which could eliminate the mechanical signaling shutter. laboratory and sea evaluations have proved the feasibility of and provided the long daylight high-speed optical communication ranges that could be attained from operation of the dc 1000-watt and 2200-watt xenon lamps at the focus of 12-inch, 18-inch searchlights and in the Fresnel lens omni-directional beacon which a command ship uses to signal all ships in a task force at once. With these advances, optical communication provides the highspeed capability of radio communication, particularly, also, with the new omnidirectional transceiver.

关键词： SHIPS

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MACHINERY ARRANGEMENT DESIGN - A PERSPECTIVE

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NAVAL ENGINEERS JOURNAL 1981年第3期93卷 133-141页

作者： RESNER, ME KLOMPARENS, SH LYNCH, JP Mr. Michael E. Resner:received an Engineering Degree from Texas A&M University in 1966 and has done graduate work in management at American University. He is Director Machinery Arrangements/Control Systems and Industrial Facilities Division (SEA 525) at the Naval Sea Systems Command. His previous positions have included Program Manager Solar Total Energy Program at the Department of Energy and Branch Chief Machinery Control Systems Branch at the Naval Ship Engineering Center. Mr. Stephen H. Klomparens:is a Naval Architect at Designers & Planners Inc. and is engaged in development of computer aids for ship design. He received his B.S.E. degree in Naval Architecture and Marine Engineering from the University of Michigan in 1973 and his M.S. degree in Computer Science from the Johns Hopkins University. Mr. Kolmparens began his professional career at Hydronautics Inc. in 1974 where he was involved in the use of marine laboratory facilities for test and development of conventional and advanced marine craft. Since 1977 he has been involved with naval and commercial ship design and with development of computer-aided ship design tools. Mr. John P. Lynch:is a Principal Marine Engineer with Hydronautics Inc. He was previously employed in the auxiliary machinery and computer-aided design divisions of the David W. Taylor Naval Ship R&D Center the machinery design division of the New York Naval Shipyard and the machinery arrangement code of the Bureau of Ships. His active naval service was as a ship superintendent in the production department of the Long Beach Naval Shipyard. Mr. Lynch received his B. S. degree in Marine Engineering from the New York State Maritime College and his M.S. degree in Mechanical Engineering from Columbia University. He is a licensed Professional Engineer in the State of New York and a member of ASNE.

The machinery arrangement design process has remained relatively unchanged over the years. Recently, external demands have been placed on both the product and the producers that call for changes to this process. This paper cites these external demands and traces the evolution of the process changes from the rule-of-thumb machinery box sizing routines up to the current automated procedures. The machinery arrangement design practice is presented, and existing analytic and graphics aids are discussed. The user requirements for improved design aids are presented, with implementation guidelines and hardware/software alternatives.

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Regulator Problems with a Cost for Applying or Changing control

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IFAC Proceedings Volumes 1974年第1期7卷 477-480页

作者： Ibrahim Awad Ian B. Rhodes Department of Computer Science and Automatic Control Alexandria University Alexandria Egypt Control Systems Science and Engineering Washington University St. Louis Missouri 63130

An examination is made of linear regulator problems with an additional cost for applying a nonzero control at each instant. The dual of this problem is the least-squares filtering problem with a cost for taking measurements. Because a solution to the general problem involves solving a two point boundary value problem in nonlinear matrix differential or defference equations, two easily-computed suboptimal control schemes and some useful bounds are proposed. A class of problems is also delineated for which the optimum solution has some special properties which enable it to be computed simply and directly.

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PHASE AND FREQUENCY TRACKING ACCURACY IN DIRECT-DETECTION OPTICAL-COMMUNICATION systems

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IEEE TRANSACTIONS ON COMMUNICATIONS 1972年第6期CO20卷 1139-&页

作者： SNYDER, DL RHODES, IB Department of Electrical Engineering and the Biomedical Computer Laboratory Washington University Saint Louis MO USA Laboratory of Control Systems Science and Engineering Washington University Saint Louis MO USA

Lower bounds are given on the attainable mean-square performance in causally tracking the phase and frequency of a subcarrier that modulates an optical carrier in a direct-detection opticalcommunication system.

关键词： Optical modulation Oscillators Stochastic processes Frequency synchronization Phase modulation Intensity modulation Difference equations Gaussian processes Viterbi algorithm Communication system control

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FILTERING AND control PERFORMANCE BOUNDS WITH IMPLICATIONS ON ASYMPTOTIC SEPARATION

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automaticA 1972年第6期8卷 747-&页

作者： SNYDER, DL RHODES, IB D. Snyder is affiliated with the Department of Electrical Engineering and the Biomedical Computer Laboratory Washington University St. Louis Missouri 63130 USA I. Rhodes is affiliated with the Laboratory of Control Systems Science and Engineering Washington University St. Louis Missouri 63130 USA

A bound is derived on the accuracy in causally estimating a Gaussian process from nonlinear observations. Both additive Gaussian noise and Poisson observations are included. The bound is used to study the control of a stochastic linear dynamical system with nonlinear observations of either type and an average quadratic cost. An asymptotic Separation Theorem is established showing that a linear feedback control law, involving a state estimate, is asymptotically optimum as the accuracy of the state estimate approaches the bound. On dérive une limite sur la précision dans l'estimation causale d'un processus gaussien à partir d'observations non-linéaires. Le bruit additif Gaussien aussi bien que les observations de Poisson sont incluses. La limite est utilisée pour étudier le contrôle d'un système dynamique stochastique linéaire avec observations non-linéaires d'un genre ou d'un autre, et un coût moyen quadratique. Un Théorême de Séparation asymptotique est établi montrant qu'une loi de contrôle de rétroaction linéaire impliquant une estimation d'état, est asymptotiquement optimum à mesure que la précision de l'estimation d'état approche la limite. Abgeleitet wird eine Schranke für die Genauigkeit bei der kausalen Schätzung eines Gauß'schen Prozesses aus nichtlinearen Beobachtungen. Sowohl additives Gauß'sches Rauschen als auch Poisson'sche Beobachtungen sind eingeschlossen. Die Schranke wird benutzt, um die Steuerung eines linearen stochastischen dynamischen systems mit nichtlinearen Beobachtungen beider Typen und durchschnittlichen quadratischen Kosten zu studieren. Ein asymptotisches Separationstheorem wird eingeführt, das zeigt, daß ein eine Zustandsschätzung einschließendes lineares Regelungsgesetz asymptotisch optimal ist, so wie sich die Genauigkeit der Zustandsschätzung der Schranke nähert. Бывeдeнa гpaницa тoчнocти пyтeм кayзaльнoй oцeнки гayccoвcкoгo пpoцecca нa ocнoвe нeлинeйныч нaблюдeний. Бключeны aддитивныe вeличины яayccoвcкoгo шyмa и нaблюдeний Пyaccoнa.

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On the Move to Meaningful Internet systems: OTM 2012 Workshops 1

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丛书名： Lecture Notes in computer science

1000年

作者： Pilar Herrero Hervé Panetto Robert Meersman Tharam Dillon

ISBN: (数字)9783642336188

ISBN: (纸本)9783642336171

This volume constitutes the refereed proceedings of ten international workshops, OTM Academy, Industry Case Studies Program, EI2N, INBAST, Meta4eS, OnToContent, ORM, SeDeS, SINCOM and SOMOCO 2012, held as part of OTM 2012 in Rome, Italy, in September 2012. The 66 revised full papers presented were carefully reviewed and selected from a total of 127 submissions. The volume also includes 7 papers from the On the Move Academy (OTMA) 2012 as well as 4 CoopIS 2012 poster papers and 5 ODBASE 2012 poster papers. The paper cover various aspects of computer supported cooperative work (CSCW), middleware, Internet/Web data management, electronic commerce, enterprise modelling, workflow management, knowledge flow, agent technologies, information retrieval, software architectures, service-oriented computing, and cloud computing.

关键词： Artificial Intelligence Information Storage and Retrieval Information systems Applications (incl. Internet) computer Appl. in Administrative Data Processing User Interfaces and Human computer Interaction Simulation and Modeling

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Many-Criteria Optimization and Decision Analysis 1

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丛书名： Natural Computing Series

1000年

作者： Dimo Brockhoff Michael Emmerich Boris Naujoks Robin Purshouse

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Swarm Intelligence 1

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丛书名： Lecture Notes in computer science

1000年

作者： Marco Dorigo Mauro Birattari Thomas Stützle Gianni A. Caro René Doursat Andries P. Engelbrecht Dario Floreano Luca Maria Gambardella Roderich Groß Erol Şahin Hiroki Sayama

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