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

作者： Peng Xiao Ganesh K. Venayagamoorthy Keith A. Corzine Robert Woodley Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri Rolla USA 21st Century Systems Inc. Fort Leonard Wood MO USA

Many commercial and military transport systems have fault diagnostic functions implemented to help protect the device when a severe fault occurs. However, most present systems do not contain prognostics capability which would allow operators to observe an unhealthy system component in its pre- fault condition. In industry applications, scheduled downtime can result in considerable cost avoidance. The next technology step is self-healing system components which observe not only potential problems, but can also take steps to continue operation under abnormal conditions - whether due to long-term normal wear-and-tear or sudden combat damage. In this paper, current and voltage information using the double-layer gate drive concept is fed to intelligent networks to identify the type of fault and its location. These intelligent networks are based on unsupervised and supervised learning networks (self-organizing maps and learning vector quantization networks respectively). The proposed concept allows the reconfiguration of the electric machinery system for continued normal operation of the machine. This paper presents an intelligent health monitoring and self-healing control strategy for a multi-phase multilevel motor drive under various types of faults.

关键词： Circuit faults intelligent networks Power system protection Industry applications Job shop scheduling Costs Voltage Fault diagnosis Supervised learning Self organizing feature maps

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Differential Evolution Approach for Reactive Power Optimization of Nigerian Grid System

Differential Evolution Approach for Reactive Power Optimizat...

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IEEE General Meeting Power& Energy Society

作者： G. A. Bakare G. Krost G. K. Venayagamoorthy U. O. Aliyu Abubakar Tafawa Balewa University Bauchi Nigeria Electrical Power Systems Institute University of Duisburg-Essen Duisburg Germany Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri Rolla MO USA

The goal of reactive power dispatch is to minimize the system losses and improve the system voltage profiles at all times. This is achieved by adjusting various generating units' excitation systems continuously, discrete tap positions of on-load tap changers of transformers as well as switching of correct doses of inductors or capacitors. This is a mixed integer non-linear optimization problem. In this paper, the differential evolution (DE), a novel evolutionary computation technique which was originally designed for continuous problems is applied to solve this problem. DE appears to ally qualities of established computational intelligence (CI) techniques with a more striking computational performance, thus suggesting the possibility of having the potential for on line applications in the control center; comparison work with other techniques is presently conducted. The developed tool was demonstrated on the Nigerian power system grid for three case scenarios preset on the power world simulator which was linked with DE for power flow calculation (fitness check of solutions). The results achieved revealed that DE procured a significant reduction of real power losses while simultaneously keeping the voltage profiles within the acceptable limits.

关键词： Reactive power Power system simulation On load tap changers Transformers Inductors Capacitors Evolutionary computation Computational intelligence Computational modeling Load flow

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Force Tracking Impedance Control of Robot Manipulators for Environment with Damping

Force Tracking Impedance Control of Robot Manipulators for E...

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Annual Conference of Industrial Electronics Society

作者： Seul Jung T. C. Hsia Intelligent Systems and Emotional Engineering Laboratory BK21 Mechatronics Group Mechatronics Engineering Department Chungnam National University Daejeon South Korea Department of Electrical & Computer Engineering University of California Davis CA USA

In this paper, a simple force tracking algorithm for robot manipulators is presented. In the framework of impedance control formulation, the controller can deal with uncertainties from unknown environment and unknown robot dynamics. Uncertainties in the robot dynamics are compensated by the time-delayed joint space control method. The damping characteristic of the environment which is usually ignored in the impedance force formulation is considered. The stability of the impedance function is analyzed and assured under uncertain environment. Extensive simulation studies are presented for testing the performance of the impedance function.

关键词： Force control Impedance Robot control Manipulators Damping Uncertainty intelligent robots Orbital robotics Mechatronics Robust control

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An All-Digital Low-Power Structural Health Monitoring System

An All-Digital Low-Power Structural Health Monitoring System

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IEEE Conference on Technologies for Homeland Security

作者： Jina Kim Benjamin L. Grisso Dong S. Ha Daniel J. Inman Department of Electrical and Computer Engineering Virginia Tech Virginia Technology VLSI for Telecommunications Laboratory Blacksburg VA USA Department of Mechanical Engineering Virginia Tech Center for Intelligent Material Systems and Structures Blacksburg VA USA

Structural health monitoring is desirable in many fields to provide a means of damage detection on a variety of structures. Unfortunately, the ability to equip structures with health monitoring systems is limited by the development of adequate hardware. Previously, prototypes using the impedance-based health monitoring method have been developed to lay a foundation for permanent structural damage detection. These prototypes served their purposes, but has shortcomings such that large size and high power consumption. In this paper, all-digital excitation and sensing techniques are developed to reduce both the size and power dissipation. The digital techniques are implemented onto a new prototype, which achieves substantial reduction in size and power consumption. Validation of the new hardware on a representative structure is presented and compared with traditional techniques for structural health monitoring.

关键词： Frequency conversion Hardware Power dissipation Voltage Signal generators Prototypes Impedance measurement Frequency measurement computerized monitoring Energy consumption

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Novel Architecture for Reconfigurable Optical Add-Drop Multiplexer Using Single Arrayed Waveguide Grating

Novel Architecture for Reconfigurable Optical Add-Drop Multi...

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The Joint International Conference on Optical Internet and Next Generation Network (COIN-NGNCON)

作者： Kwanil Lee Sang Bae Lee Sil-Gu Mun Chang Hee Lee Phonics Research Laboratory Intelligent Systems Division Korea Institute of Science and Technology Seoul South Korea Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Daejeon South Korea

A novel optical add-drop multiplexer using arrayed waveguide grating is proposed for optical transport networks. By use of circulators in the coupled fold-back paths between demultiplexed channels, we improve the loss... 详细信息

关键词： Arrayed waveguide gratings Optical arrays Optical waveguides Optical add-drop multiplexers Optical crosstalk Optical signal processing Optical films Optical filters Circulators Wavelength division multiplexing

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Eikonomia-An Integrated Semantically Aware Tool for Description and Retrieval of Byzantine Art Information

Eikonomia-An Integrated Semantically Aware Tool for Descript...

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International Conference on Tools for Artificial Intelligence (ICTAI)

作者： Konstantinos N. Vavliakis Andreas L. Symeonidis Georgios T. Karagiannis Pericles A. Mitkas Electrical and Computer Engineering Department Aristotle University of Thessaloniki Thessaloniki Greece Intelligent Systems and Software Engineering Laboratory Informatics and Telematics Institute CERTH Thessaloniki Greece Sacred Convent of the Annunciation ORMYLIA Art Diagnosis Centre Chalkidiki Greece

ISBN: (纸本)9780769530154;076953015X

Semantic annotation and querying is currently applied on a number of versatile disciplines, providing the added-value of such an approach and, consequently the need for more elaborate - either case-specific or generic - tools. In this context, we have developed Eikonomia: an integrated semantically-aware tool for the description and retrieval of Byzantine artwork Information. Following the needs of the ORMYLIA Art Diagnosis Center for adding semantics to their legacy data, an ontology describing Byzantine artwork based on CIDOC-CRM, along with the interfaces for synchronization to and from the existing RDBMS have been implemented. This ontology has been linked to a reasoning tool, while a dynamic interface for the automated creation of semantic queries in SPARQL was developed. Finally, all the appropriate interfaces were instantiated, in order to allow easy ontology manipulation, query results projection and restrictions creation.

关键词： Information retrieval Art Ontologies Cultural differences Data mining Artificial intelligence Documentation Relational databases intelligent systems Software engineering

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Management of an intelligent argumentation network for a web-based collaborative engineering design environment

Management of an intelligent argumentation network for a web...

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International Symposium on Collaborative Technologies and systems

作者： Xiaoqing Liu Man Zheng Ganesh K. Venayagamoorthy Ming Leu Department of Computer Science University of Missouri Rolla Rolla MO USA Real-Time Power and Intelligent Systems Laboratory Department of Electrical & Computer Engineering University of Missouri Rolla Rolla MO USA Department of Mechanical and Aerospace Engineering University of Missouri Rolla Rolla MO USA

ISBN: (纸本)9781424433896;0978569911

Conflict resolution is one of the most challenging tasks in collaborative engineering design. In our previous research, a web-based intelligent collaborative system was developed to address this challenge based on intelligent computational argumentation. However, two important issues were not resolved in that system: priority of participants and self-conflicting arguments. In this paper, we develop two methods for incorporating priorities of participants into the computational argumentation network: 1) weighted summation and 2) re-assessment of strengths of arguments based on priority of owners of the argument using fuzzy logic inference. In addition, we develop a method for detection of self-conflicting arguments. Incorporation of priority of participants and detection of self-conflicting arguments have strengthen the capability of managing intelligent argumentation network for the web-based collaborative engineering design system developed in our previous research.

关键词： Collaboration Artificial intelligence Fuzzy sets Engines Input variables Robustness USA Councils

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LANDING AN UNMANNED AIR VEHICLE: VISION BASED MOTION ESTIMATION AND NONLINEAR CONTROL

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Asian Journal of Control 2008年第3期1卷

作者： Omid Shakernia Yi Ma T. John Koo Shankar Sastry Dept. of Electrical Engineering & Computer Science University of California at Berkeley Berkeley CA94720-1774 U.S.A. Tak-Kuen John Koo received the B.Eng. degree in 1992 in Electronic Engineering and the M.Phil. in 1994 in Information Engineering both from the Chinese University of Hong Kong. From 1994 to 1995 he was a graduate student in Signal and Image Processing Institute at the University of Southern California. He is currently a Ph.D. Candidate in Electrical Engineering and Computer Sciences at the University of California at Berkeley. His research interests include nonlinear control theory hybrid systems inertial navigation systems with applications to unmanned aerial vehicles. He received the Distinguished M.Phil. Thesis Award of the Faculty of Engineering The Chinese University of Hong Kong in 1994. He was a consultant of SRI International in 1998. Currently he is the team leader of the Berkeley AeRobot Team and a delegate of The Graduate Assembly University of California at Berkeley. He is a student member of IEEE and SIAM. S. Shankar Sastry received his Ph.D. degree in 1981 from the University of California Berkeley. He was on the faculty of MIT from 1980-82 and Harvard University as a Gordon McKay professor in 1994. He is currently a Professor of Electrical Engineering and Computer Sciences and Bioengineering and Director of the Electronics Research Laboratory at Berkeley. He has held visiting appointments at the Australian National University Canberra the University of Rome Scuola Normale and University of Pisa the CNRS laboratory LAAS in Toulouse (poste rouge) and as a Vinton Hayes Visiting fellow at the Center for Intelligent Control Systems at MIT. His areas of research are nonlinear and adaptive control robotic telesurgery control of hybrid systems and biological motor control. He is a coauthor (with M. Bodson) of “Adaptive Control: Stability Convergence and Robustness Prentice Hall 1989.” and (with R. Murray and Z. Li) of “A Mathematical Introduction to Robotic Manipulati

In this paper, we use computer vision as a feedback sensor in a control loop for landing an unmanned air vehicle (UAV) on a landing pad. The vision problem we address here is then a special case of the classic ego-motion estimation problem since all feature points lie on a planar surface (the landing pad). We study together the discrete and differential versions of the ego-motion estimation, in order to obtain both position and velocity of the UAV relative to the landing pad. After briefly reviewing existing algorithm for the discrete case, we present, in a unified geometric framework, a new estimation scheme for solving the differential case. We further show how the obtained algorithms enable the vision sensor to be placed in the feedback loop as a state observer for landing control. These algorithms are linear, numerically robust, and computationally inexpensive hence suitable for real-time implementation. We present a thorough performance evaluation of the motion estimation algorithms under varying levels of image measurement noise, altitudes of the camera above the landing pad, and different camera motions relative to the landing pad. A landing controller is then designed for a full dynamic model of the UAV. Using geometric nonlinear control theory, the dynamics of the UAV are decoupled into an inner system and outer system. The proposed control scheme is then based on the differential flatness of the outer system. For the overall closed-loop system, conditions are provided under which exponential stability can be guaranteed. In the closed-loop system, the controller is tightly coupled with the vision based state estimation and the only auxiliary sensor are accelerometers for measuring acceleration of the UAV. Finally, we show through simulation results that the designed vision-in-the-loop controller generates stable landing maneuvers even for large levels of image measurement noise. Experiments on a real UAV will be presented in future work.

关键词： Motion estimation computer vision based control unmanned air vehicle differential flatness

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Flatness-Based Feedback Linearization of A Synchronous Machine Model With Static Excitation And Fast Turbine Valving

Flatness-Based Feedback Linearization of A Synchronous Machi...

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IEEE General Meeting Power& Energy Society

作者： E.C. Anene U.O. Aliyu J. Levine G. K. Venayagamoorthy Abubakar Tafawa Balewa University Bauchi Nigeria Ecole des Mines de Paris Centre Automatique et Systémes Fontainebleau France Real-Time and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri Rolla MO USA

This paper focuses attention on the concept of flatness-based feedback linearization and its practical application to the design of an optimal transient controller for a synchronous machine. The feedback linearization scheme of interest requires the generation of a flat output from which the feedback control law can easily be designed. Thus the computation of the flat output for reduced order model of the synchronous machine with simplified turbine dynamics is hereby presented. The corresponding linearized compensator is derived as well as the nonlinear controller for transient stabilization of a synchronous machine subjected to large disturbances. The transient behavior of a single machine equipped with the so designed nonlinear controllers feeding an infinite bus is illustrated via simulation in Matlab environment. The results obtained for transient disturbances on the single machine infinite bus system (SMIBS) are presented and compared with other control algorithms to demonstrate the effectiveness of the proposed scheme.

关键词： Feedback Synchronous machines Turbines Power system transients Control systems Power system modeling Power system control Neurofeedback Stability Computational modeling

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Recent advances in networked control systems

Recent advances in networked control systems

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2007 International Conference on Control, Automation and systems (ICCAS 2007), vol.5

作者： Zengqi Sun Hongbo Li Yan Wang Department of Computer Science and Technology State Key Laboratory of Intelligent Technology and Systems Tsinghua University Beijing China School of Automation Science and Electrical Engineering Beijing Aeronautics and Astronautics University Beijing China

This paper presents a comprehensive overview of the current state of research in the area of Networked control systems (NCSs) first. Then two modeling and control methods are introduced for NCSs in details. The first one is a stochastic control method, which investigates the H{sub}∞ control problem for NCSs with random network-induced delay. The second one is a switch control method, which focuses on solving the stabilization problem for NCSs in discrete-time domain, where both network-induced delay and packet dropout are taken into account. Illustrative examples are given to demonstrate the effectiveness of the proposed approaches. Finally, this paper concludes with the discussion of possible future development of NCSs from a control perspective.

关键词： Networked control systems (NCSs) Network-induced delay Packet dropout Stability H{sub}∞

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