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A pattern recognition approach for steady‐state security evaluation of an electrical power system

European Transactions on Electrical Power 1991年第5期1卷 243-251页

A new pattern recognition approach to steady‐state security evaluation of electrical power systems is presented. Such approach is based upon a combined use of the „nearest‐neighbour” method and of an opportune system model ‐ previously proposed by the authors ‐for the basis of knowledge generation. In the first part of the paper, the definition of steady‐state security and the problems arising from its on‐line evaluation are briefly recalled. Then, the pattern recognition approach proposed is described in some detail, and its ability in order to overcome the computational drawbacks of traditional methods is illustrated. Afterwards, some remarks on the system model utilized are reported. Finally, a numerical experiment with reference to the AEP 14 bus test system is presented, showing very encouraging results. Copyright © 1991 John Wiley & Sons, Ltd.

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Tracking in a complex visual environment 1st

Tracking in a complex visual environment

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1st European Conference on Computer Vision, ECCV 1990

作者： Aloimonos, John Yiannis Tsakiris, Dimitris P. Computer Vision Laboratory Center for Automation Research and Institute for Advanced Computer Studies and Computer Science Department University of Maryland College ParkMD20742-3411 United States Electrical Engineering Department and Systems Research Center University of Maryland College ParkMD20742-3411 United States

ISBN: (纸本)9783540525226

We examine the tracking of 3-dimensional targets moving in a complex (e.g. highly textured) visual environment, which makes the application of methods relying on static segmentation and feature correspondence very problematic, even under specific assumptions about the trajectory of the target. From the system kinematics and optical flow formalism we derive a general criterion, the Tracking Constraint, which specifies the optimal camera reorientation as the one that minimizes the optical flow in the center of the camera in the sense of an appropriate metric. A correspondence-free scheme is devised which employs dynamic segmentation and linear features of the image in order to capture global information about the scene and bypass numerical differentiation of the image intensity. © Springer-Verlag Berlin Heidelberg 1990.

关键词： Optical flows

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Performance analysis of automated manufacturing systems with blocking and deadlock

Performance analysis of automated manufacturing systems with...

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International Conference on Computer Integrated Manufacturing

作者： N. Viswanadham T.L. Johnson Y. Narahari Department of Computer Science and Automation Indian Institute of Science Bangalore India GE Corporate Research & Development Control Systems Laboratory Schenectady NY USA

Petri net and Markov chain models are developed for manufacturing systems with blocking and deadlock. The authors compute the probability that the system in an absorbing (deadlocked) state, the mean time to deadlock, and the throughput before deadlock, etc., which can be used to compare the performance of various prevention and avoidance strategies. A systematic method for designing locks and interlocks for deadlock avoidance using the reachability graph of the Petri net model is presented.< >

关键词： Performance analysis Manufacturing systems System recovery Throughput Machining control systems

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Motion planning in a dynamic domain

Motion planning in a dynamic domain

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IEEE International Conference on Robotics and automation (ICRA)

作者： K. Fujimura H. Samet Center for Engineering Systems Advanced Research Oak Ridge National Laboratory Oak Ridge TN USA Center for Automation Research and Computer Science Department and Institute for Advanced Computer Studies University of Maryland College Park MD USA

Motion planning is studied in a time-varying environment. Each obstacle is a convex polygon that moves in a fixed direction at a constant speed. The robot is a convex polygon that is subject to a speed bound. A method of determining whether or not there is a translational collision-free motion for a polygonal robot from an initial position to a final position and of planning such a motion, if it exists, is presented. The method makes use of the concept of configuration spaces and accessibility. An algorithm is given for motion planning in such an environment, and its time complexity is analyzed.< >

关键词： Robots Motion planning Orbital robotics Robotics and automation Algorithm design and analysis Space stations systems engineering and theory Laboratories Motion analysis Shape

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Application of an Adaptive control Method to the Guide Roll Force control for Ring Rolling Processes

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IFAC Proceedings Volumes 1990年第8期23卷 335-340页

作者： H.D. Choi H.S. Cho C.O. Lee Control Systems Design Department Korea Advanced Energy Research Institute P.O. Box 7 Daeduck-Danji Choong-Nam Korea Department of Production Engineering Korea Advanced Institute of Science and Technology P.O. Box 150 Chongryangri Seoul Korea

In spite of several advantages and increasing application of the ring rolling process, analytical design method for controlling the process has been little investigated. This paper considers the ring rolllng process control and treats the problem of controlling the guide roll force which is critical to the stability of the rolling process. There are difficult control problems associated with this process due to the nonlinear characteristics and parameter variation of the process dynamics. In order to control the guide roll force to track a desired profile as close as possible durIng the rolling cycle, an adaptive controller was designed taking into consIderation these fundamental properties of the rolling process. Simulation studies were conducted to verify the effectiveness of this controller. The results show that the proposed adaptive controller is fairly InsensitIve to the parameter variation, and yields desirable performance of tracking guIde roll force throughout the rolling time.

关键词： Adaptive control force control nonlinear systems parameter estimation ring rolling process

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Multivariable Adaptive Optimisation of the Performance of Fermentation Process

Multivariable Adaptive Optimisation of the Performance of Fe...

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American control Conference (ACC)

作者： C Kambhampati M. T. Tham G. A Montague A. J. Morris National Engineering Laboratory UK Advanced Control and Knowledge Based Systems Research Group DEPARTMENT (IF CHEMICAL AND PRICESS ENGINEERING University of Newcastle Newcastle-Upon-Tyne UK

This paper addresses the multi-variable optimisation of bioreactor performance. The central idea here is to use a time series model, which is identified on-line, to evaluate the steady-state performance of the bioreactor. A simple algorithm has been developed around this theme and analysed in Kambhampati et al (1989). A fermentation process model has been developed to provide a test system for the optimisation scheme. The model takes into account the effect of temperature and dilution rate on the biomass production. For this process a multi-variable, model is identified on-line. It has been shown that the model provided optimal results.

关键词： Steady-state Mathematical model Bioreactors Temperature control systems Chemical engineering Algorithm design and analysis Monitoring System testing Biomass

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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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control structure determination and enhanced self-tuning using the 'MUSE' AI toolkit

Control structure determination and enhanced self-tuning usi...

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IEE Colloquium on Knowledge Based Environments for Industrial Applications Including Co-Operating Expert systems in control

作者： R. Corea D. Peel A.J. Morris Advanced Process Control and Knowledge Based Systems Research Group Department of Chemical and Process Engineering University of Newcastle UK

The basis of a comprehensive real-time knowledge based system for control structure design and supervisory control is developed using the MUSE AT toolkit. Representation of control engineering knowledge as procedural code in an object-based structure ensures that the knowledge base is easily understood and modified by domain experts. The simple learning capability that has been implemented has proved to be extremely useful and is being developed further as part of continuing research in this area. It is also hoped to extend the capabilities of the supervisory modules particularly in dealing with loop interactions, the prediction and diagnosis of faults and the provision of an intelligent operator interface.< >

关键词： Adaptive control Digital control Design automation control systems Knowledge based systems Knowledge representation

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Adaptation of plans via annotation verification 88

Adaptation of plans via annotation verification

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1st International Conference on Industrial and Engineering Applications of Artificial Intelligence and Expert systems, IEA/AIE 1988

作者： Kambhampati, Subbarao Hendler, James A. University of Maryland Institute for Advanced Computer Studies College Park United States Center for Automation Research Computer Science Department Systems Research Center United States

ISBN: (纸本)0897912713

The ability to adapt old plans to new situations is essential for a planning system. A perceived problem with the adaptation methods in traditional memory-based planning approaches has been the need for a strong domain model in addition to a library of past plans. In this paper, we argue that the process of adaptation does not need any domain knowledge outside of that which a generative planner has available. We present an approach to plan reuse in which information relevant to the adaptation process is left in the form of annotations on generated plans. Adaptation of a past plan to a new problem situation is focused by a process of annotation verification, which locates applicability failures and suggests appropriate refitting strategies. The generative planner is then called upon to carry out these refits. We give examples from automated process planning (in computer-aided manufacturing) to show how annotation verification helps in adaptation. These examples also help in showing how adaptive planning can be an efficient and viable alternative to the generative and semi-automated variant planning techniques currently used in process planning. © ACM 1988.

关键词： Computer aided manufacturing

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Robust Observer Design with Application to Fault Detection

Robust Observer Design with Application to Fault Detection

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American control Conference (ACC)

作者： N. Viswanadham K. Dean Minto Department of Computer Science and Automation Indian Institute of Science Bangalore India Control Systems Laboratory GE Corporate Research and Development Center Schenectady NY USA

A new scheme for robust estimation of the partial state of linear time-invariant multivariable systems is presented, and it is shown how this may be used for the detection of sensor faults in such systems. We consider an observer to be robust if it generates a faithful estimate of the plant state in the face of modelling uncertainty or plant perturbations. Using the Stable Factorization approach we formulate the problem of optimal robust observer design by minimizing an appropriate norm on the estimation error. A logical candidate is the 2-norm, corresponding to an H ∞ optimization problem, for which solutions are readily available. In the special case of a stable plant, the optimal fault diagnosis scheme reduces to an internal model control architecture.

关键词： Robustness Fault detection Observers State estimation MIMO Sensor systems Face detection Uncertainty Estimation error Fault diagnosis

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