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NAVAL ENGINEERS JOURNAL 1988年第3期100卷 53-61页

作者： SWENSON, EN MAHINSKE, EB STOUTENBURGH, JS Capt. Erick N. Swenson USNR (Ret.):is a project manager for special projects in the Surface Ship Systems Division Hughes Aircraft Company Fullerton Calif where he has been employed since his retirement from the U.S. Navy in 1975. Originally trained as an electronics technician during WWII in the Captain Eddy program he later received a BS degree in electrical engineering from the University of Rochester Rochester N. Y. in 1950. Subsequent engineering education was received at the University of Pittsburgh Pittsburgh Penn. and the Naval Postgraduate School Monterey Calif. After commissioning he was ordered to duty as the electronics division officer on the USSMissouri(BB-63) and electronics ships superintendent at Hunters Point Naval Shipyard San Francisco Calif. When the design of the Naval Tactical Data System began in the mid-1950s Lt. (j.g.) Swenson was ordered to the Bureau of Ships Navy Department Washington D.C. as the junior engineering duty only officer assigned to the project. From 1962 to 1965 LCdr. Swenson was assigned as the BuShips technical representative on the program at Remington Rand Univac St. Paul Minn. For the next ten years he returned to BuShips/NavSea/NAVSEC as the NTDS project officer. During this time the project expanded considerably foreign military sales were heavily involved and interoperability with other services and countries were established. His final effort on active duty was to instigate the redesign of the previousSpruanceclass destroyers into the newerAdmiral Kiddclass improvement program. He is a registered professional electrical engineer in the State of California listed inWho's Who in the Worldis a life member of ASNE and chairman of the Long Beach/Greater LA Section. Capt. Edmund B. Mahinske USN (Ret.):is an alumnus of the U.S. Naval Academy the Massachusetts Institute of Technology and the Harvard Business School. His technical background is in electronics and he specialized in the management of programs involving the application of comp

A little over thirty years ago, a group of naval engineers were assembled by the Bureau of Ships to develop a new system approach to the combat information center (CIC). The CIC of World War II, with its “grease pencil” plots and voice telling of tactical information from sensors and other ships, could no longer provide the timely, coordinated reaction to postwar threats. This project group led the Navy into the new world of large-scale, high-speed digital electronics and into a new mode of conducting naval warfare as well. There were no off-the-shelf computers of the requisite capability, size and reliability; what were available were monstrous vacuum tube computers. There were no display equipments that were “conversant” in both the digital language of the computer and the analog language of the sensors and the weapon systems. Who ever heard, at that time, of a computer running a tactical communication net automatically? It was hard enough to find sufficient numbers of engineers who knew what a digital computer was. This paper, by three naval engineers in the implementing engineering office, depicts the evolvement of the Naval Tactical Data Systems (NTDS) as they saw it. It discusses the problems that stemmed from the transition from the old world of analog into the new digital world, the system concepts that steered the development; the key decisions that were made; new electronic equipment and processes that became necessary; and the need of the mangagement to face the real world of deadlines, ship schedules and operational requirements.

关键词： NAVAL WARFARE

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Linear State-Space Systems in Infinite-Dimensional Space: The Role and Characterization of Joint Stabilizability/Detectability

Linear State-Space Systems in Infinite-Dimensional Space: Th...

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American control Conference (ACC)

作者： Clas A. Jacobson Carl N. Nett Department of Electrical and Computer Engineering Northeastern University Boston MA USA Control Technology Branch Geneal Electric Corporate Research and Development Center Schenectady NY USA

In this paper several fundamenal results from the theory of linear state-space systems in finite-dimensional space are extended to encompass a class of linear state-space systems in infinite-dimensional space; specifically, we generalize those results from the finite-dimensional theory pertaining to the relationship between input-output and internal stability, the problem of dynamic output feedback stabilization, and more generally, the concept of joint stabilizability/detectability. In the course of doing so a complete structural characterization of jointly stabilizable/detectable systems is obtained. These results are distinguished by their generality, as we consider a large class of linear state-space systems, assuming only that (i) the evolution of the state is governed by a strongly-continuous semigroup of bounded linear operators, (ii) the state-space is a Hilbert space, (iii) the input and output spaces are finite-dimensional, and (iv) the sensing and control operators are bounded. In turn, general conclusions regarding the fundamental structure of control-theoretic problems in infinite-dimensional space may be drawn from these results.

关键词： Stability Output feedback Hilbert space control systems Distributed parameter systems Research and development Jacobian matrices Linearity Physics Mathematics

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A SUFFICIENT CONDITION FOR OUTPUT-FEEDBACK STABILIZATION OF UNCERTAIN SYSTEMS

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IEEE TRANSACTIONS ON AUTOMATIC control 1986年第11期31卷 1055-1057页

作者： ZEHEB, E Department of Electrical Engineering Technion-Israel Institute of Technology Haifa Israel Department of Electronic Communications Control and Computer Systems Faculty of Engineering Tel-Aviv University Tel-Aviv Israel

A sufficient condition is derived for the existence of an output constant gain feedback controller which stabilizes a single-input single-output dynamical system with a linear nominal part and matched uncertainties. The sufficient condition is significantly less restrictive than a recently derived one [1]. If such a controller exists, it may readily be computed.

关键词： Sufficient conditions Output feedback Uncertain systems Transfer functions Uncertainty Communication system control Military computing Robust control control systems Adaptive control

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An interactive control systems simulator

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IEEE control Systems Magazine 1986年第2期6卷 20-26页

作者： K. Diehl B. Krogh M. Nagurka Department of Electrical and Computer Engineering Systems Control Technology Carnegie Mellon University Palo Alto CA USA Department of Mechanical Engineering Carnegie Mellon University Pittsburgh PA USA

An Interactive control systems Simulator (ICS) for control engineering education is presented. ICS contains an interactive block diagram editor with which arbitrary linear control systems can be constructed for a library of predefined nonlinear plants. The time response of the constructed system is simulated with animated graphics, and data can be collected for display with the ICS plotting facility. This paper describes the structure and use of ICS and presents two examples.

关键词： control system synthesis Interactive systems Displays Workstations control engineering control engineering education Linear feedback control systems

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computer control of an Aerobic Batch Process in a Two Reactor System

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IFAC Proceedings Volumes 1985年第17期18卷 63-67页

作者： J. Van Breugel G.Ch. van Eybergen A.J. Overwater G. Honderd H.B. Verbruggen Computer Group Laboratory of Bioengineering Department of Chemical Technology Delft University of Technology Julaianalaan 67 2628 BC Delft The Netherlands Laboratory of Control Engineering Department of Electrical Engineering Delft University of Technology Delft The Netherlands

Aerobic processes tend to show gradients in the oxygen concentration in the liquid, when performed on a large scale. In parts of the reactor productivity decreases, due to oxygen limitation. controllers capable of maintaining a sufficiently high level of oxygen throughout the entire reactor volume are necessary. Some intermediate steps in the design of such controllers are described. These controllers are tested in a pseudo full scale reactor system, consisting of two separate small scale reactors: one aerated, the other reactor stirred only, without aeration. The two compartments are interconnected by a circulation flow. Two ways of control are described, both of which function satisfactory. However, they both use information available in a well defined bench scale system, but not on a full scale. Therefore a controller has been designed, combining online parameter estimation and a Luenberger observer. This combination is the subject of present research.

关键词： Biology chemical industry computer control feedback/feedforward industrial control modelling observers parameter estimation state estimation

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Identification of Continuous-Time Systems from Sampled Data: A Comparison of 3 Direct Methods

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IFAC Proceedings Volumes 1985年第5期18卷 1575-1578页

作者： N.K. Sinha Zhou Qijie Department of Electrical and Computer Engineering McMaster University Hamilton Ontario Canada Department of Automatic Control South China Institute of Technology Gnangzhou The Peopleʼs Republic of China

Three direct methods for the identification of a linear continuous-time system from the samples of input and output observations are considered. These are based on obtaining approximate expressions for the signals from their samples. The methods are (i) block-pulse functions, (ii) trapezoidal pulse functions, and (iii) cubic spline functions. In each case, the differential equations are integrated using these approximations and the results are used for estimating the parameters of a model of given order and structure which will provide the best fit in the least squares sense. Results of simulation are included which compare the relative performance of the three methods both in the absence and the presence of measurement noise.

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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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A Practical Robustness Theorem for Adaptive control

A Practical Robustness Theorem for Adaptive Control

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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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AN ADVANCED METHODOLOGY FOR PRELIMINARY HULL FORM DEVELOPMENT

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NAVAL ENGINEERS JOURNAL 1984年第4期96卷 147-161页

作者： LIN, WC DAY, WG HOUGH, JJ KEANE, RG WALDEN, DA KOH, IY Wen-Chin Lin:heads the Ship Powering Division at the David Taylor Naval Ship R&D Center (DTNSRDC). Dr. Lin received his B.S. degree in mechanical engineering from the National Taiwan University in 1957. He was awarded his M.S. degree in naval architecture and Ph.D. in engineering science from the University of California at Berkeley in 1963 and 1966 respectively. From 1966 to 1969 he was employed by ESSO Research and Engineering Company to conduct marine hydrodynamic research for oil tankers and offshore structures. Since joining DTNSRDC in 1969 he has actively conducted and directed hydrodynamic research to advance naval ship design technology and improve ship performance. Active in national and international symposia on ship hydrodynamic research he is recognized for contributions to the ship research community. For the past six years he has been a member of the Performance Committee of the ITTC and currently serves as secretary of the committee. He is a member of SNAME and the Society of Naval Architects of Japan. William G. Day Jr:. has been employed as a naval architect at the David Taylor Naval Ship R&D Center since receiving a B.E.S. degree from the Johns Hopkins University in 1966. He obtained an M.S. E. degree from George Washington University in 1971. As Head Design Evaluation Branch of the Ship Performance Department he is responsible for model experiments to evaluate the hydrodynamic performance of ships and propulsors. He is a member of ASNE and SNAME. In-Young Koh:received his B.S. and M.S. degrees in electrical engineering from Lowell University in 1969 and 1971 respectively and his Ph.D. in applied mechanics from Rensselaer Polytechnic Institute in 1976. Dr. Koh joined DTNSRDC as an electronic engineer specializing in the application of advanced instrumentation and computer techniques to ship research and design. He is currently engaged in research and development of active control systems for naval ship applications. Dr. Koh is a member of ASNE SNAME and IEEE. David Andrew Walden:is

A ship design methodology is presented for developing hull forms that attain improved performance in both seakeeping and resistance. Contrary to traditional practice, the methodology starts with developing a seakeeping-optimized hull form without making concessions to other performance considerations, such as resistance. The seakeeping-optimized hull is then modified to improve other performance characteristics without degrading the seakeeping. Presented is a point-design example produced by this methodology. Merits of the methodology and the point design are assessed on the basis of theoretical calculations and model experiments. This methodology is an integral part of the Hull Form Design System (HFDS) being developed for computer-supported naval ship design. The modularized character of HFDS and its application to hull form development are discussed.

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Development of an interactive graphical user interface for the UMIST control design suite

Development of an interactive graphical user interface for t...

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IEEE Conference on Decision and control

作者： Dean K. Frederick Neil Munro Peter Putz Dieter Platzer Electrical Computer and Systems Engineering Department Rensselaer polytechnic Institute Troy NY USA Control Systems Centre UMIST (University of Manchester Institute of Science and Technology) Manchester UK

A collaborative effort has been undertaken at both UMIST and Rensselaer to use interactive computer graphics to develop an improved user interface for the UMIST suite of programs for performing analysis, design, and synthesis of control systems. The objective is to explore ways in which presently available and newly emerging interactive graphics terminals can be employed with this specific suite and with control design packages in general. This paper is a presentation of the plans for this project and a report on its progress to date.

关键词： Graphical user interfaces control design User interfaces

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