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American control Conference (ACC)

作者： Wen Yu Guijun Zhang CINVESTAV-IPN Automatic Control Section Mexicali Mexico Research Center of Automation Northeastern University Shenyang China

This paper presents a new modelling and control method of a 2.4 m transonic wind tunnel by analyzing its special properties. Multivariable linearization models are first used for wind tunnel control, and a dual closed... 详细信息

ISBN: (纸本)0780338324

关键词： Automatic control Aerodynamics Valves control systems Servomechanisms Circuits Neural networks Distributed control Distributed computing automation

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Adaptive H/sub /spl infin//-control for nonlinear systems

Adaptive H/sub /spl infin//-control for nonlinear systems

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American control Conference (ACC)

作者： Wei-Min Lu A. Packard Automation and Control Section Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA Berkeley Center for Control and Identification and Department of Mechanical Engineering University of California Berkeley CA USA

The adaptive H/sub /spl infin//-control problem for parameter-dependent nonlinear systems with full information feedback is addressed. The dissipation theoretic techniques as well as projection methods are used to der... 详细信息

关键词： Programmable control Adaptive control Nonlinear control systems control systems Nonlinear systems Robust control Feedback Parameter estimation Uncertain systems Ear

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Developing a prototype concurrent design tool for composite topside structures

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NAVAL ENGINEERS JOURNAL 1997年第3期109卷 279-290页

作者： Dirlik, S Hambric, S Azarm, S Marquardt, M Hellman, A Bartlett, S Castelli, V Steve Dirlik:began his career at the Naval Surface Warfare Center Carderock Division in 1981 as an aerospace engineer co-op student. He completed his bachelor of science degree in aeropace and ocean engineering from Virginia Polytechnic Institute and State University in 1985 and his master of science degree in aerospace engineering from the University of Maryland in 1990. Mr. Dirlik recently completed a master of science program in applied physics at The Johns Hopins University and currently works in the Radar Cross Section and Target Physics Branch of the Signatures Directorate at the Naval Surface Warfare Center Corderoke Division. He has worked on Navy low observable programs since 1990. Stephen Hambric:is a research associate at the Applied Research Laboratory at The Pennsylvania State University. He received his B. S. and M.S. degree in mechanical engineering from Virginia Polytechnic Institute and State University and his D. Sc. in mechnical engineering from the George Washington University. He has worked on several computer aided multidiscikplinary design and optimization projects over the years including an automated propeller design system and a structural acoustic optimization capability. Dr. Shpour Azarm:is currently working as an associate professor with the Design and Manufacturing Group of the Department of Mechanical Engineering at the University of maryland at College Park. Dr Azarm's expertise is in the areas of optimization-based designed and concurrent design and optimization of multidisciplinary systems. He was a consultant at Black & Decker Corporation (summer 1996) and worked as a Navy senior summer faculty fellow (summer 1995) and a NASA summer faculty fellow (summer 1994). He was a visiting scientist at NASA Langley Research Center for Multidisciplinary Analysis and Applied Structural Optimzatiom at the University of Siegen in Germany (spring 1992) and the Design Institute of the Technical University of Denmark (summer 1990). Dr Azarm was an associate technical editor of the ASME Jour

A prototype concurrent engineering tool has been developed for the preliminary design of composite topside structures for modern navy warships. This tool, named GELS for the Concurrent Engineering of Layered Structures, provides designers with an immediate assessment of the impacts of their decisions on several disciplines which are important to the performance of a modern naval topside structure, including electromagnetic interference effects (EMI), radar cross section (RCS), structural integrity, cost, and weight. Preliminary analysis modules in each of these disciplines are integrated to operate from a common set of design variables and a common materials database. Performance in each discipline and an overall fitness function for the concept are then evaluated. A graphical user interface (GUI) is used to define requirements and to display the results from the technical analysis modules. Optimization techniques, including feasible sequential quadratic programming (FSQP) and exhaustive search are used to modify the design variables to satisfy all requirements simultaneously. The development of this tool, the technical modules, and their integration are discussed noting the decisions and compromises required to develop and integrate the modules into a prototype conceptual design tool.

关键词： Warships

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Function point analysis: evaluation of a software cost estimation model

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European Journal of Information Systems 1991年第4期1卷 229-237页

作者： Heemstra, F. J. Kusters, R. J. Department of Industrial Engineering and Management Science University of Technology Section Management Information Systems and Automation Research Group Estimation and Control of Software Development Eindhoven The Netherlands

The merits of function point analysis are discussed. Function point analysis was chosen because it is one of the most widely used aids for software cost estimation. In the analysis we use data from a large survey of Dutch organizations, from an experiment on the effectiveness of software cost estimation models and from a field study aimed at the adjustment part of the FPA model. Conclusions show that it is indeed widely used and that it performs reasonably well as a product sizer, but that the adjustment part of the model is less useful.

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The use of power Darlington transistors in an 40 kVA UPS system-an improved solution

The use of power Darlington transistors in an 40 kVA UPS sys...

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： A. Quintas J. Faria A. Martins A. Araujo J. Silva Automation and Control Section (DEEC) Porto University Porto Portugal

The use of power Darlington transistors for an inverter of a 40 kVA uninterruptible power supply (UPS) system is discussed, and the storage time, dead time, and switching aid network contributions to the total harmonic content of the output voltage are examined. A review of common switching aid circuits, for nominal and short-circuit conditions, is presented, and their limitations are discussed. A solution, conceived specifically for power Darlington transistors, is presented. The solution that fits the most relevant characteristics of this technology is analyzed regarding commutation under nominal conditions, commutation under short-circuit conditions, and contribution to harmonic distortion in the output voltage. Conclusions are drawn about the optimal switching frequency for this type of application. The discussion and conclusions are supported by experimental and simulation results.< >

关键词： Uninterruptible power systems Power harmonic filters Pulse width modulation inverters Magnetic separation Switching frequency Circuits Harmonic distortion Voltage Inductance Storage automation

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New Feasibility Study of Bristol's Relative Gain Array in Interaction Analysis of Multivariable Process control Systems

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IFAC Proceedings Volumes 1984年第2期17卷 1831-1836页

作者： Gong Jianping Chemical Process Control Section Automation Department Beijing Institute of Chemical Technology Heping Street Beijing The People's Republic of China

In this paper, the limitation of the Bristol's relative gain used as the interaction index of multivariable control systems is pointed out. The study on digital simulation in the dynamic interaction of some two input-two output control systems, including dual quality control system of distillation column, has been done; and the interacting responses of 15 control systems are examined under four different situations. The results show that under some particular conditions which are given in this paper the steady-state relative gain can be used as the comparative standard of interaction measure for several control systems; and in some control systems, the distinctive dynamic interaction may be appeared even if their dynamic relative gains are equal at all. Consequently, the dynamic relative gain also can not correctly reveal to interaction property of multivariable system. Thus, new appraisal of the feasibility for Bristol's relative gain array is given in this paper.

关键词： Multivariable control system process control interaction interacting path relative gain array steady-state relative gain dynamic relative gain

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IS automation THE MAGIC POTION FOR MANNING PROBLEMS

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NAVAL ENGINEERS JOURNAL 1982年第2期94卷 127-136页

作者： MELLIS, JG PLATO, AI REIN, RJ James G. Mellis:attended Central Institute in Kansas City Mo. where he graduated in Electronic Engineering Technology. He later attended the University of Minn. in Minneapolis. At present he works in the Manning and Controls Integration Section of the Naval Sea Systems Command. Mr. Mellis is responsible for developing manpower requirements for ship design and for the coordination of shipboard automation designs with the U.S. Navy's manpower policies and availability. Mr. Mellis is currently developing manpower requirements for the U.S. Navy's DDGX ship design. In this capacity he has examined proposals for shipboard manpower reductions through the use of automation and remote control techniques. Another project where Mr. Mellis is heavily engaged in is the Ship Systems Engineering Standards (SSES) development. Mr. Mellis is the assistant project manager for the test and evaluation and producibility aspects of the SSES project. Previously prior to his employment with NAVSEA Mr. Mellis worked for General Dynamics/Electronic Division as a Senior Field Engineer on the Apollo Instrumentation Ships (i.e. Vanguard Restone Mercury). He was responsible for Central Data Processing Systems on the three ships. Artis I. Plato:is the Head of the Manning and Controls Integration Section of the Naval Sea Systems Command (NAVSEA). He is responsible for the development of accurate manpower requirements for all new construction and major overhaul ship projects for the U.S. NAVY. In addition Mr. Plato must coordinate shipboard controls integration and automation aspects with manpower requirements to insure that a compatible solution is developed. Mr. Plato began his professional career in 1956 at the New York Naval Shipyard. There he worked in the Internal Combustion Engine and Shipboard Elevator Section. During 1957 and 1958 he was called up for active duty with the U.S. Army Corps of Engineers. He served in Europe with various Construction Engineers units. After release from active duty he returned to the shipyard. In 19

This paper examines the recent experience in the UNITED STATES NAVY where automation has been introduced into new ship designs. While other attributes are recognized in the introduction of automated shipboard systems, such as the ability to respond more quickly in combat situations, this paper focuses on the effects of automation upon ship manpower requirements. Specific examples show that expected reductions in manning were not achieved in recent ship designs where automation was incorporated for that purpose. While the use of shipboard automation is not without its critics, the U.S. Fleet appears to have accepted the concept. User feedback addresses the issues of reliability, the provisions for backup systems, the need for better qualified personnel and the concern about maintenance workload. The authors provide specific recommendations for improved guidance to ship designers to more effectively apply automation in the ship design process.

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A DYNAMIC ANALYSIS OF A COGAS PROPULSION PLANT

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Naval Engineers Journal 1977年第6期89卷 19-34页

作者： ABBOTT, JACK W. McINTIRE, JOHN G. RUBIS, C. JOSEPH Mr. Jack W. Abbott:is Head of the Systems Engineering and Analysis Branch Ship Design Division Naval Ship Engineering Center. He received his BSME degree from Stanford University in 1960 and his ME A degree from The George Washington University in 1975. He is a Lieutenant Commander USNR (Ret.) having served during his active duty period as Engineering Officer aboard a U. S. destroyer for 3 years and also a registered Professional Engineer in the State of California. In addition to holding several U.S. Patents he annually instructs courses in the Design of Naval Surface Ships at the Massachusetts Institute of Technology including the concept of total energy systems. He is a member of SNAME and has been a member of ASNE and a frequent contributor to the Journal since 1966 most recently having been a co—recipient of the “Jimmie Hamilton” Award for the best paper published in 1976. Mr. John G. Mclntire:received his BS and MS degrees from the University of California at Berkeley where he did his graduate studies in the field of Automatic Control Systems Design. He was employed by the Naval Ship Engineering Center in 1971 as a Mechanical Engineer and is currently serving as Acting Head of the Machinery Control Systems Section Machinery Systems Division. He is a member of the NA VAIR/NA VSEA Association of Scientists and Engineers the American Society of Mechanical Engineers and the National Society of Professional Engineers. Mr. C. Joseph Rubls:isPresident of Propulsion Dynamics Inc. Annapolis Md. where he is engaged in simulation and analytical studies of ship propulsion and automation systems. Previous to his present position he was a Scientific Consultant and Head of the Control Systems Branch David W. Taylor Naval Ship Research & Development Center Annapolis Laboratory where he was employed over a 10–year period. His other employment experience includes the Martin—Marietta Company as Senior Systems Engineer for Guidance Radar and for Communications Systems the U.S. Naval Academy American Universi

The paper provides a dynamic analysis of a COGAS Propulsion Plant, including mathematical modeling and simulation, and concludes with the results of a COGAS simulation which indicates encouraging conclusions regarding...

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PROPERTIES OF A COST FUNCTION EMPLOYED IN A SECOND-ORDER OPTIMIZATION ALGORITHM

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JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS 1972年第1期38卷 42-&页

作者： MAYNE, DQ Control and Automation Section Center for Computing and Automation Imperial College of Science and Technology Exhibition Road London S.W.7 U.K.

In the second-order differential dynamic programming algorithm, and the second-variation optimisation algorithm, a new control is generated at each iteration using a linear control policy of the form: u(t) = u ∗ (t) + K(t)[x(t) − x ̄ (t)] , where x ( t ) is the new and x ̄ (t) the old state at time t . Associated with this policy is a cost function. This paper establishes certain properties of the cost function for arbitrary piecewise continuous functions u ∗ (·) and K (·), permitting the determination of sufficient conditions for the following statement: “If the distance between the nominal and new control functions is ϵ, then the error in the estimated change in cost is of the order ϵ 3 .”

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