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ROBUST SPECIFICATION INFLUENCE ON FEEDBACK control STRATEGIES

IFAC Proceedings Volumes 2002年第1期35卷 425-430页

作者： M. Gil-Martínez M. García-Sanz System Engineering and Automation Group Electrical Engineering Department University of La Rioja. Luis de Ulloa 20 26004 Logroño SPAIN Automatic Control and Computer Science Department Public University of Navarra. Campus Arrosadía 31006 Pamplona SPAIN

The feedback control structures are required in the presence of any kind of uncertainty. The benefits of the feedback are mainly paid with an excessive bandwidth that amplifies the sensor noise, saturating the actuators. This implies the necessity of design tradeoffs highly transparent from the Quantitative Feedback Theory. Supposing a given uncertainty for a plant, the set of performance and stability requirements will condition the problem solution. Taking advantage of the QFT bound typology and formulation, the contribution of the robust specification values to their simultaneous achievement will be analysed and particularly as regards the challenging task of the controller design.

关键词： Robust control Uncertain dynamical systems Quantitative Feedback Theory

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control configurationfor robustness enhancement 6

Control configurationfor robustness enhancement

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6th European control Conference, ECC 2001

作者： Pedret, C. Vilanova, R. Serra, I. Moreno, R. System Engineering and Automatic Control Group. Computer Science Dept ETSE Universitat Autònoma de Barcelona Bellaterra08193 Spain

ISBN: (纸本)9783952417362

This paper proposes a design framework for robust control system design. The approach is based on improving the robustness of a previously existing controller instead of the design of a Robust controller: therefore the consideration of the controller Robustification problem. The method is based on the generation of a complement to the control signal of the initial controller by means of a Robustification Block. This robustification part, which is based on the Observer-controller configuration, will add an additional free parameter to the initial controller and will provide an IMC-like control scheme. Consequently, two important facts follows: The robustness properties of the initial controller are improved and it is not necessary to modify the initial controller. The approach is presented as a two-step design and we will concentrate on the second stage by designing for Robust Stability. To illustrate the proposed design, the temperature of an open-loop unstable bach chemical reactor is controlled. © 2001 EUCA.

关键词： Robust control

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control configurationfor robustness enhancement

Control configurationfor robustness enhancement

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European control Conference (ECC)

作者： C. Pedret R. Vilanova I. Serra R. Moreno System Engineering and Automatic Control Group Universitat Autònoma de Barcelona Bellaterra Spain

This paper proposes a design framework for robust control system design. The approach is based on improving the robustness of a previously existing controller instead of the design of a Robust controller: therefore the consideration of the controller Robustification problem. The method is based on the generation of a complement to the control signal of the initial controller by means of a Robustification Block. This robustification part, which is based on the Observer-controller configuration, will add an additional free parameter to the initial controller and will provide an IMC-like control scheme. Consequently, two important facts follows: the robustness properties of the initial controller are improved and it is not necessary to modify the initial controller. The approach is presented as a two-step design and we will concentrate on the second stage by designing for Robust Stability. To illustrate the proposed design, the temperature of an open-loop unstable bach chemical reactor is controlled.

关键词： Robustness Robust stability Transfer functions Uncertainty Shape Mathematical model

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Correlation methods of continuous-time state-space model identification

Correlation methods of continuous-time state-space model ide...

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1999 European control Conference, ECC 1999

作者： Johansson, Rolf Verhaegen, Michel Haverkamp, Bert R. J. Chou, Chun Tung Department of Automatic Control Lund Institute of Technology Lund University PO Box 118 LundS-221 00 Sweden Department of Electrical Engineering System and Control Engineering Group TU Delft GA DelftNL-2600 Netherlands

This paper presents theory, algorithms and validation results for system identification of continuous-time state-space models from finite input-output sequences. The algorithms developed are methods of subspace model ... 详细信息

ISBN: (纸本)9783952417355

关键词： Correlation methods

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Behavioral model identification

Behavioral model identification

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IEEE Conference on Decision and control

作者： R. Johansson M. Verhaegen C.T. Chou A. Robertsson Department of Automatic Control Lund Institute of Technology Lund University Lund Sweden Department of Electrical Engineering System and Control Engineering Group TU Delft Delft Netherlands

This paper presents theory and algorithms for system identification suitable for the framework of behavioral system theory. An algorithm based on algebraic system theory and realization theory (Ho-Kalman realization) in a subspace model identification framework is presented. The novel approach considered consists of the formulation of input-output data as an impulse response model and the subsequent application of state-space realization. As a special case, behavioral model identification from finite data sequences is demonstrated.

关键词： Power system modeling system identification Context modeling Matrix decomposition control engineering Fitting Mathematical model Data analysis Linear systems Regression analysis

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Adaptivity in Human-Computer Interface systems: Identifying User Profiles for Personalised Support

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IFAC Proceedings Volumes 1998年第26期31卷 407-412页

作者： M. Dimitrova G. Johannsen H.A. Nour Eldin J. Zaprianov M. Hubert Institute of Control and System Research Bulgarian Academy of Sciences PB 79 1113 Sofia Bulgaria Laboratory for Systems Engineering and Human-Machine Systems (IMAT-MMS) University of Kassel D-34109 Kassel Germany Group of Automatic Control and Technical Cybernetics atk D-42097 Wuppertal Germany

Adaptivity for user "personalised" support is viewed as complementary to systems for cognitive support and is related to the following aspects of user modelling: individual user profile, user style/state diagnosis, context of work and mental workload prediction. The paper reports the results of an empirical study revealing a particular kind of contextual influences on user behaviour, namely, the freedom to choose the set of operations to be performed from a larger set of tasks, valid for all users at the basic skill level of performance. Stability of patterns was found on the level of minimal reaction times (RTs), but not on the level of mean RTs. Neural networks successfully generalised the minimal RT profiles across contexts.

关键词： User interfaces human-centered design mental workload interface adaptation monitoring neural networks

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A transputer interface for the PUMA560 manipulator

A transputer interface for the PUMA560 manipulator

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IEE Colloquium on High Performance Computing for Advanced control

作者： Q. Wang A.M.S. Zalzala Robotics Research Group Department of Automatic Control & System Engineering University of Sheffield UK

The paper describes the design of an advanced control system for the PUMA560 industrial robotic manipulator using a high-performance parallel transputer (T805) network. The Transputer Interface Board (TIE) which establishes a transputer link to the 6503 microprocessors of the PUMA arm controller, is detailed. Much more flexibility can be achieved with this system. The interface period is now reduced to 1.75 ms (instead of the default 28 ms). controlled by this new system, PUMA moves much more smoothly.< >

关键词： Industrial control

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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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HYBRID SATELLITE AND TERRESTRIAL NETWORKS

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INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS 1994年第3期12卷 313-327页

作者： CHITRE, DM SHYY, DJ EPHREMIDES, A GUPTA, S COMSAT Laboratories 22300 Comsat Drive Clarksburg MD 20871–9475 USA. Received his B.Sc. from the University of Bombay India an M.A. in mathematics from the University of Cambridge U.K. and a Ph.D. in physics from the University of Maryland. He is currently an Associate Executive Director of the Network Technology Division at COMSAT Laboratories. He has been involved in research and development activities in ISDN VSAT networks data communications and network systems and architectures. Prior to his current positions Dr. Chitre was a Principal Scientist in the Network Technology Division at COMSAT Laboratories. Dr. Chitre joined COMSAT Laboratories in 1980. He has made major contributions to the analysis and architecture of data communication ISDN and BISDN via satellite. Dr. Chitre directs and participates in the international and national standards activities in ISDN BISDN and data communication as they apply to satellite communication. He was Chairman of the Working Group on Protocols and Network Timing Function of the CCIR/CCITT Joint Ad Hoc Group on ISDN/Satellite Matters during 1990–1992. Currently he is the Chairman of the Working Group on New Technologies in the ITU Intersector Coordinating Group (ICG) on Satellite Matters. Dr. Chitre was a programme manager during 1990 and 1991 on a contract from INTELSAT on systems studies on satellite communications systems architectures for ISDN and broadband ISDN systems. Currently he is the technical manager of the DoD Contract on ATM via satellite demonstration and the programme manager for the INTELSAT contract on analysis and top-level specification of INTELSAT ISDN subnetworks and SDH compatible transport network. Received the B.S. degree in electrical engineering from national Chiao-Tung University Hsin-Chu Taiwan in 1983 and the M.S. and Ph.D. degrees in electrical engineering from Georgia Institute of Technology Atlanta GA in 1986 and 1990 respectively. From June 1987 to October 1987 he worked for the Department of Neurology Emory Univers

The role of satellite communications in networks that provide new services, such as frame relay and multimedia, is investigated. Both passive and active (on-board switching/processing) satellite systems are considered. Novel techniques are developed for each system to demonstrate, via detailed analysis and simulation, how the communications bandwidth agility of multipoint/broadcast satellite channels, and the on-board switching/processing, makes it feasible to provide these new services via hybrid satellite and terrestrial networks in a resource-efficient manner.

关键词： HYBRID NETWORKS ON-BOARD PROCESSING FRAME RELAY

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COMMERCIAL APPLICATIONS OF ADVANCED MARINE VEHICLES FOR EXPRESS SHIPPING

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NAVAL ENGINEERS JOURNAL 1983年第3期95卷 283-300页

作者： LUEDEKE, G FARNHAM, RB JR. George Luedeke Jr.: received his BS degree in Mechanical Engineering from Massachusetts Institute of Technology and his MS degree in Product Design from Illinois Institute of Technology. Early in his career Mr. Luedeke joined General Motors Corporation as a designer responsible for development of people mover and rail rapid transit systems. From 1964 to 1974 he was with Hughes Aircraft Company. At Hughes he performed analyses and developed designs for a wide variety of program and proposal efforts such as: High Speed Ground Transportation (DOT) Task Force Command Center (NAVY) Panama Canal Marine Traffic Control Center (Panama Canal Co.) Royal Iranian Navy Command Center (Iran) Tactical Information Processing and Interpretation Center (Air Force) and WALLEYE CONDOR and PHOENIX Missile Systems (NAVY). He also had marketing development responsibilities related to the diversification of Hughes resources in civil business areas such as: Automatic train control (WMATA BARTD SCRTD) water/sewage treatment plant automation (Santa Clara County) Aqueduct Control (SWR) Hydrometeorological data collection (BPA WMO) and Salton Sea basin systems analysis (Dept. of the Interior). He was responsible for combat system integration for the Hughes 2000T Surface Effect Ship (SES) proposal. He also conducted detailed studies concerning ship flexure for the Improved Point Defense Target Acquisition System Program and for the definition of operational High Energy Laser weapon installations on a series of conventional monohulls (DLG DD and CVN). Since 1974 Mr. Luedeke has been employed at RMI Inc. (formerly Rohr Marine Inc.). During this time he has held several positions. His responsibilities have included directing a number of studies on advanced SES concepts managing activities defining mission/cost effectiveness of military and commercial SES's including defining the operational benefits and enhanced survivability characteristics of cargo SES's for high speed military sealiftfor NA TO and Southeast Asia

This paper will present the results of a marketing, engineering, and economic analysis of advanced marine vehicles done by IMA Resources, Inc. and RMI, Inc., in support of a Maritime Administration project to study “Multimode Express Shipping”. The study was conducted in 1981 and examined the economic benefits of using advanced marine vehicles as express cargo vessels in domestic and international service. Commodity characteristics, desirable express carrier rates, and potential high payoff service and route alternatives were identified. Advanced marine vehicles were surveyed and sized to meet desirable deadweight and block speed objectives. The costs of operating these craft on a variety of trade routes were calculated using an advanced marine vehicle economic analysis program. Revenues, expenses, break-even, profit and loss, cash flow requirements, tax summary and economic indicators (i.e., cost/ton – mile, etc.) were projected over the expected life of the vehicles as was return on investment. Traffic density and market penetration considerations narrowed the field of choice to smaller sized advanced marine vehicle carriers (i.e., 50 and 250 ton deadweight) and to three international and five domestic routes.

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