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作者： Wang, Lin Wang, Xiaofan Hu, Xiaoming Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Shanghai 200240 China Optimization and Systems Theory Royal Institute of Technology Stockholm SE-100 44 Sweden

ISBN: (纸本)9788995605646

In this paper, we address the design of decentralized controller for connectivity-preserving flocking without velocity measurement. An output vector based on neighbors' position information alone is constructed to replace the role of velocity, then some bounded attractive and repulsive forces are integrated together to design the controller. Under some initial conditions, we prove that the controller not only can synchronize all agents, but also can avoid collision as well as preserving connectivity among agents for all the time. Moreover, a leader-follower method is used to guide the group to a desired direction, where the neighboring relationship is totally determined by the distance. © 2011 Asian control Association.

关键词： controllers

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Distributed coordination for connectivity-preserving flocking without velocity measurement

Distributed coordination for connectivity-preserving flockin...

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Asian control Conference

作者： Lin Wang Xiaofan Wang Xiaoming Hu Department of Automation Key Laboratory of System Control and Information Processing Shanghai Jiaotong University Shanghai China Optimization and Systems Theory Royal Institute of Technology Stockholm Sweden

ISBN: (纸本)9781612844879

关键词： Algorithm design and analysis Velocity measurement Synchronization Symmetric matrices Lead Collision avoidance Position measurement

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Intelligent model of continuous improvement mechanisms scope of QMS

Intelligent model of continuous improvement mechanisms scope...

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IEEE International Conference on systems, Man and Cybernetics

作者： Sofiene Hermi Taieb Ben Romdhane Raouf Ketata Department of Physics and Instrumentation Engineering National Institute of Applied Science and Technology Tunis Tunisia Research Unit on Intelligent Control Design and Optimization of Complex System (ICOS) National Engineering School of Sfax Sfax Tunisia

This work proposes a new methodology to evaluate and improve the QMS (Quality Management system) effectiveness and efficiency to succeed for a factual approach including all monitoring parameters. This idea is justified by the difficulties incurred by the organizations to establish a continuous improvement's system based on the objectives and the process approach. In addition, the guidelines defined by the FDX 50-174 part published by AFNOR to assess the QMS effectiveness, still guides defining the assessment criteria and progress levels. Indeed, to facilitate the continuous improvement system's integration, we propose a new methodology based on a broad range of monitoring tools (functional and operational indicators, audits, quality control, customer satisfaction) and including the requirements of the process and the system approach.

关键词： Continuous improvement Design engineering Quality management Condition monitoring Customer satisfaction ISO standards Physics Instruments Management training Cybernetics

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A Novel Method Of controller Design For Simultaneous Stabilization And Performance Improvement Of An Electromagnetic Levitation system

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Asian Journal of control 2008年第4期9卷

作者： Subrata Banerjee T. K. Sunil Kumar Jayanta Pal Dinkar Prasad Department of Electrical Engineering Indian Institute of Technology Kharagpur India. T.K.Sunil Kumar:was born in 1974 at Calicut India. He received the B.Tech in electrical engineering in 1997 from N.S.S College of Engineering Palakkad (Calicut University) and M.Tech in Power System in 2001 from Regional Institute of Technology Jamshedpur (Ranchi University). Since 2001 he has been pursuing research work for his Ph.D in Electrical Engineering at Indian Institute of Technology Kharagpur. He is a life member of Systems Society of India. His main research interests includes application of control theory and computers to power system model order reduction genetic algorithm PID tuning random search optimization controller deign in 2-DOF configuration and interval systems. Emerson Network Power India.

This paper describes design and implementation of a control philosophy for simultaneous stabilization and performance improvement of an electromagnetic levitation system. An electromagnetic levitation system is an inherently unstable and strongly nonlinear system. To determine the overall closed loop stability for such a system, cascade lead-lag compensation has mostly been reported [1,2]. However, a single lead controller can not satisfy both stability and performance for such unstable systems [3]. Performance enhancement to satisfy the conflicting requirements of fast response with almost zero overshoot and zero steady state error has been successfully achieved by using a two loop controller configuration. The lead controller in the inner loop is designed to ensure stability while the outer loop PI controller is designed for performance enhancement. This approach decouples the twin requirements of stabilization (by the inner loop) and performance achievement (by the outer PI loop). The outermost PI controller has been designed using the ‘Approximate Model Matching’ technique [4]. The proposed control strategy has been implemented and the experimentation has been demonstrated successfully. Different experimental results have been included for verification.

关键词： Electromagnetic levitation lead-lag compensation approximate model matching control switched-mode DC to DC chopper model order reduction technique.

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Expansion of Codd algebra operations with recursive objects

Expansion of Codd algebra operations with recursive objects

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International Forum on Strategic Technology, IFOST

作者： V.V. Govorushko V.B. Novoseltsev The Faculty of Computer Science and Engineering Control System Optimization Department Cybenetic Center Tomsk Polytechnic University Tomsk Russia

In this paper, we discuss the relational algebra and recursive relationships between binary and ternary relationships in entity-relationship modeling. We define the interpretation of the recursive tables that can be applied to the complicated relationships having the same participating entities. We propose a new approach to modeling that is suitable for representing self-similar objects and for creating hierarchical structures. It combines methods of the set theory for the recursive relations within a single modeling paradigm, allowing users to define self-similar, partially self-similar, or hierarchical systems in a consistent and flexible manner. The use of recursive relationships in the definitions of self-similar objects yields representations that can be rendered at varying levels of detail or precision at run time.

关键词： Algebra Relational databases Data models Set theory Mathematical model Logic functions Computer science systems engineering and theory control systems Hierarchical systems

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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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Theory and characteristics of novel variable reluctance 1X resolver

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ELECTRICAL ENGINEERING IN JAPAN 1996年第5期116卷 128-137页

作者： Ishizaki, A Takasaki, K Shimomura, S Masaki, K Kitazawa, K Tokyo Denki University The Polytechnic University Tamagawa Seiki Co. Ltd. [?]Graduated in 1948 from the Department of Electrical Engineering Tokyo Institute of Technology and received his Dr. of Eng. degree from the same university. He joined Meidensha Corporation in April 1948. He has engaged in research development and design of rotating machines. He became a General Manager of the First Division at Research Laboratory in 1965 a Plant Manager of Ohsaki Works in 1974 and a Director in 1977. He became a Professor in the Department of Electrical Engineering Nagaoka University of Technology in 1981. He has been a Professor on the Faculty of Engineering Tokyo Denki University since 1990. He is engaged mainly in the analysis of rotating machines using finite element method as well as research on the optimization of the rotating machines and their control as a system. He is a member of IEEE.

Although brushless resolvers have been used widely as angular position transducers, they are expensive due to their intricate construction, involving a rotary transformer to supply the exciting coils wound on the rotor poles with the current. It is shown theoretically in this paper that the resolver without rotary transformer or brushes can be realized by simple construction, which consists of the stator core with both 4-poles exciting windings and 2-poles output ones and the rotor core carrying no windings. In this resolver the rotor core has minimum gap at one side and a maximum gap at another side of the diameter. It is characterized by an outer surface form that makes the fluctuation part of gap permeance very in proportion to cos theta, where theta represents the angular position of a point in the air gap with respect to the origin on the rotor, the point of minimum air gap. The method determining the rotor form to embody the afore-mentioned gap permeance variation is also shown. It has been confirmed not only by simulation but also experiment that the 2-phase output voltages of a model designed based on the theory have sinusoidal waveforms with very small harmonic contents. Moreover, the rotor position detected by processing the output voltages through the conventional resolver/digital converter was within acceptable engineering accuracy.

关键词： resolver VR type rotating position detection optimal rotor shape electrical error

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ACCURACY REQUIREMENTS FOR MEASUREMENT systemS WITH UNIFORM AND NORMAL ERRORS

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NAVAL ENGINEERS JOURNAL 1993年第1期105卷 66-69页

作者： SNOW, JM STUCKMAN, BE USHER, JS Jeffrey M. Snow:received his B.S. degree in mechanical engineering from the University of Washington in 1977. He has worked at Boeing Commercial Aircraft Company and Puget Sound Naval Shipyard. Since 1985 he has been at Naval Surface Warfare Center Crane Division (NSWCC). From 1987 to 1990 he was in charge of quality assurance configuration management and reliability for Aegis (SPY-1 and Mk-99) microwave tubes. He currently is in the Radar System Branch at NSWCC. He is a member of ASQC and ASME. His areas of interest include the use of statistics in process improvement efforts and objectively rating and rewarding suppliers for better quality. Bruce E. Stuckman:holds a Ph.D. degree in systems engineering from Oakland University where he also obtained M.S. and B.S. degrees in electrical and computer engineering. In 1992 Dr. Stuckman obtained his J.D. from the University of Louisville where he graduated cum laude. He is currently an associate in the patent and computer law department of Brooks & Kushman a law firm specializing in intellectual property and technology related causes. Prior to this he was an associate professor of both electrical engineering at the University of Louisville and a member of the Research Advisory Board of the South Central Bell Telecommunications Research Center. Dr. Stuckman is the author of over 75 published works in a variety of research areas including global optimization algorithms control systems communication and telecommunication systems and instrumentation electronics. He has served as a technical consultant to such organizations as Control Data Corporation General Electric General Motors Research Laboratories Gulf & Western AT&T Bell Laboratories ARCO Research and Technical Services and the U.S. Government and has been a frequent lecturer at national and international symposia. He is a senior member of IEEE and a member of ASNE Eta Kappa Nu Tau Beta Pi Sigma Xi and Phi Kappa Phi. John S. Usher Ph.D. P.E.:is an assistant professor of industrial engineering

Accuracy requirements are usually determined as a percentage of the specification range of the measured part or process. Setting accuracy requirements in this manner results in a wide and unpredictable range of false rejection and acceptance probabilities. This causes extra costs due to either: 1) over specification of measurement systems accuracy requirements;2) time, effort, retesting, and resolution of false rejections;or 3) system degradation caused by false acceptance of out-of-specification parts. Achieving a consistent and known risk of false acceptance is only possible by considering the measured process C(pk), the process's mean in relation to the center of the specification range, and the measurement system error distribution. This paper presents a method for calculating the probabilities of false rejection and false acceptance for a normal process which is measured with, alternately, uniform and normally distributed error. It is shown that under most conditions uniform error causes 20% to 30% higher false rejection and acceptance probabilities. Thus, knowledge of measurement error distribution could provide lower total production cost.

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Flight and fire control knowledge representation

Flight and fire control knowledge representation

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IEEE Conference on Decision and control

作者： E.Y. Rodin D. Geist Y. Lirov Department of System Science and Mathematics Center of Optimization and Semantic Control Washington University Saint Louis MO USA AT and T Bell Laboratories Inc. Holmdel NJ USA

The development of a conceptual framework for an operational, onboard, real-time multiprocessing computer system, capable of assisting the pilot in flight and fire control decisions, i.e. a tactical decision aiding expert system, is discussed. Air combat is considered as a game problem in which two opponent teams mutually endeavor to maximize their opportunities to destroy each other, while minimizing their own risk of loss. The authors describe their approach to generating and solving this game through semantic control theory, which is introduced to make such a problem accessible. Specifically, they introduced logic into the model to assist in breaking it down sufficiently so that the important aspects of the classical approach can be used at the low level of the solution hierarchy, while the high-level mechanism of the solution generates the minimal space of all possible missions, assuming team cooperation, and devises an efficient search procedure on this space to find the best mission. The difference between classical control and semantic control is essentially the introduction of a correlator block, which uses the system input and output to generate the classical feedback control law by symbolic manipulation.< >

关键词： Fires Knowledge representation control systems Space missions Real time systems Expert systems Game theory control theory Logic Correlators

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