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9th Mini Conference on Vehicle System Dynamics, Identification and Anomalies, VSDIA 2004

作者： Kulcsár, Balázs Bokor, József Budapest University of Technology and Economics Department of Transport Automation Bertalan L. u. 2. Z.5 H-1111 Budapest Hungary Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences Kende u. 13-17 H-1111 Budapest Hungary

ISBN: (纸本)9634208754

The paper deals with the LPV systems in respect to fault detection and isolation. The FPRG method is extended to use with affine LPV system where one could guarantee the disturbance attenuation. The paper presents a method for the robust detection filter design based on geometric approach for Linear Parameter Varying systems. The filter is using the general Fundamental Problem in Residual Generation method in presence of external noise, while disturbance decoupling from failure signitures in LPV system is not possible. The disturbance attenuation is achieved with induced L2 norm minimization concepts for LPV model class. A numerical example is solved to demonstrate the effectiveness of robust LPV fault detection filter.

关键词： Fault detection

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Distributed, master-less control of modular DC-DC converters

Distributed, master-less control of modular DC-DC converters

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Collection of Technical Papers - 2nd International Energy Conversion Engineering Conference

作者： Gray, Michael S. Gao, Zhiqiang Button, Robert M. Cleveland State University Cleveland OH 44115 United States NASA Glenn Research Center Cleveland OH United States Department of Electrical and Computer Engineering United States Center for Advanced Control Technologies United States Electrical Systems Research Branch M.S 333-2 21000 Brookpark Rd. United States

ISBN: (纸本)1563477157

A distributed control system (DCS) is developed and hardware verified for a class of digitally controlled modular DC-DC converters. The converters are each independently controlled by its own FPGA-based digital controller. A control Area Network (CAN) is first set up for the converters to communicate in a master-less peer-to-peer manner. An algorithm is developed to make the converters share the load (current) dynamically in a predetermined manner. More importantly, it makes it possible to for all converters to automatically time-shift their PWM gating signals to minimize the current ripple, which is known as interleaving. An algorithm is developed for this distributed master-less control of power converter system so that the load sharing and interleaving are adjusted autonomously, in real time, as the number of converters changes without prior knowledge. Copyright © 2004 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： DC motors

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Fuzzy rudder-roll damping system based on analysis of the autopilot commands

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IFAC Proceedings Volumes 2004年第10期37卷 285-290页

作者： Viorel Nicolau Emil Ceanga Department of Automatic Control and Electronics "Dunarea de Jos" University of Galati 47 Domneasca Street Galati 800008 Galati ROMANIA Research Center in Advanced Process Control Systems "Dunarea de Jos" University of Galati 47 Domneasca Street Galati 800008 Galati ROMANIA

For mono-variable autopilots, there are moments of time when the command of the rudder to control the yaw angle has a negative influence on roll oscillations, being a supplemental task for the roll stabilization controller. It is desirable to avoid this situation instead of trying to correct it. A fuzzy rudder-roll damping (FRRD) system is proposed, which modifies the autopilot commands, so that roll damping effects to be obtained, with small rudder angle and rudder rate values. The FRRD system can be used with any SISO autopilot with slow steering machine and with- or without other roll controller

关键词： fuzzy systems ship control nonlinear systems rudder-roll damping

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Quadratic stability of process systems in generalized lotka-volterra form

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IFAC Proceedings Volumes 2004年第13期37卷 1217-1222页

作者： A. Magyar G. Szederkényi K.M. Hangos Process Control Research Group Systems and Control Laboratory Computer and Automation Research Institute HAS H-1518 P.O. Box 63 Budapest Hungary Tel.: +361 2796000； fax: +361 466 7503 Department of Computer Science University of Veszprém H-8200 Egyetem u. 10 Veszprém Hungary Tel.: +***； fax: +***

The global and local stability of process systems in generalized Lotka-Volterra form is studied in this paper using entropy-like and quadratic Lyapunov function candidates. The global stability check for LV models is performed by solving an LMI for a diagonal positive semi-definite matrix using singular perturbation technique. It is shown that a quadratic Lyapunov function can also be determined by solving linear matrix inequalities (LMIs). In addition, the quadratic stability neighborhood is convex in the space of the quasi-monomials and can be estimated by computing its corner points using LMIs. Furthermore, it is proved that quadratic stability with a diagonal weighting matrix enables to construct a dissipative-Hamiltonian description of the system. The developed methods are illustrated on the model of a continuously stirred tank reactor with a nonlinear reaction system.

关键词： quasi-polynomial systems Lotka-Volterra systems stability analysis linear matrix inequalities Hamiltonian systems

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Design Methodology for BNC Applications Based on Open systems

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IFAC Proceedings Volumes 2004年第5期37卷 141-146页

作者： J. Ramírez C. Miguel de Molina G. Arturo Jiménez P. Guillermo María A. Noriler Mechatronic Department ITESM Campus Monterrey México Manufacturing Integrated Systems Center ITESM Campus Monterrey México Informatic Research Center ITESM Campus Monterrey México Student of Control and Automation Engineering Federal University of Santa Catarina UFSC Brazil

This document presents a design methodology for building applications based on the Universal Numerical control (UNC) reference architecture based on open systems developed on previous research works. UNC architecture map the openness concept to the needs of countries in development which justification emerges from the need of acquiring low cost CNC technology and making retrofit of manual machine tool. The methodology discusses guidelines for the design documentation and mainly addresses the kind of information needed using design notations such as UML. The project was developed under a collaboration agreement between ITESM in Mexico and the Santa Catarina University in Brazil.

关键词： CNC control Design Methodology Open System controller

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Scheduling algorithms and sensitivity analysis for heterogeneous batch processors with incompatible job families

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Journal of the Chinese Institute of Industrial Engineers 2004年第1期21卷 18-26页

作者： Mathirajan, M. Iyer, Sivakumar Appa Chandru, Vijay Singapore-MIT Alliance School of Mechanical and Production Engineering Nanyang Technological University 50 Nanyang Avenue 639 798 Singapore Department of Computer Science and Automation Indian Institute of Science India Bangalore India School of MPE Division of Systems and Engineering Management Indian Institute of Science Department of Computer Science and Management Studies National Institute of Advanced Studies Jawaharlal Nehru Centre for Advanced Scientific Research India

We consider the problem of scheduling heterogeneous batch processor under the conditions non-identical job sizes, dynamic job arrivals and incompatible job families. The problem studied in this paper is motivated by heat-treatment operations in the pre-casting stage of steel casting manufacturing. We proposed a few heuristic algorithms with maximizing the average utilization of batch processors as scheduling objective. From the computational experiments carried out, it appears that all the proposed heuristics are yielding very close to the optimum (estimated optimum) average utilization of the batch processors. Further, we carried out a few simple sensitivity analyses. From sensitivity analysis, in general, it appears that there is an influence on the performance of the proposed heuristic algorithms when the input parameter changes. The influence observed is further verified statistically. Finally, it is observed that with respect to the scheduling objective, the choice of the best algorithm(s) do not significantly affected due to changes in the parameters considered.

关键词： Scheduling

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Polishing robot for PET bottle molds using a learning-based hybrid position/force controller

Polishing robot for PET bottle molds using a learning-based ...

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Asian control Conference

作者： F. Nagata Y. Kusumoto K. Watanabe K. Tsuda K. Yasuda K. Yokoyama M. Omoto H. Miyako Fukuoka Industrial Technology Center Interior Design Research Institute Fukuoka Japan Department of Advanced Systems Control Engineering Graduate School of Science and Engineering Saga University Honjomachi Saga Japan Asa Systems Inc. Fukuoka Japan Yaskawa Electric Corporation Fukuoka Japan MEIHO Company Limited Fukuoka Japan

In this paper, a high precision polishing robot with a learning-based hybrid position/force controller is proposed for polishing PET (poly ethylene terephthalate) bottle molds. In polishing, the position control system loosely interferes with the force control system in suitable directions. The shape of a mounted abrasive tool, attached to the tip of a robot arm, is a ball-end type. When a PET bottle mold with curved surface is polished, not only the orientation of the mounted abrasive tool is fixed but also its revolution is locked. The motion of the mounted abrasive tool is feedforwardly controlled based on an initial trajectory calculated in advance. The trajectory is generated from cutter location data constituted from a CAM system. The trajectory is modified through the actual polishing processes so that the total force error in polishing becomes smaller. The surface is polished by a polishing force acting between the mold and the abrasive tool. The polishing force is assumed to be considered as a composite force of the contact and kinetic friction forces, in which the friction consists of Coulomb and viscous frictions. A few polishing experiments are conducted to show that the proposed system is effective for obtaining a polishing surface as achieved by skilled workers.

关键词： Force control Robots Positron emission tomography Abrasives Friction Position control Shape Motion control Computer aided manufacturing CADCAM

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Future Directions in Sensors

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AIP Conference Proceedings 2004年第1期700卷 1611-1619页

作者： Vittal Rao John Barnes Bita Ghaffari R. Bruce Thompson 1Control Networks & Computational Intelligence Electrical and Communication Systems Division Engineering Directorate National Science Foundation Arlington VA 2Nondestructive Evaluation Branch Materials and Manufacturing Directorate Air Force Research Laboratory Wright‐Patterson Air Force Base Dayton OH 3Physical and Environmental Sciences Department Research and Advanced Engineering Ford Motor Company Dearborn MI 4Center for Nondestructive Evaluation Iowa State University Ames IA

There is a growing interest in applications of embedded and integrated sensors to ensure the reliability of structural components. The results of a panel discussion to elucidate future directions and key issues are presented. Views of three organizations, with different missions and objectives, on needs and opportunities are first presented, followed by a summary of general audience discussion. Emphasis is placed on identifying the commonalities and differences in those needs and opportunities.

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An new evolutionary multi-objective optimization algorithm

An new evolutionary multi-objective optimization algorithm

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2003 Congress on Evolutionary Computation, CEC 2003

作者： Mu, Sheng-Jing Su, Hong-Ye Chu, Jian Wang, Yue-Xuan Nat. Lab. of Ind. Control Technol. Zhejiang Univ. Institute of Advanced Process Control Hangzhou 310027 China National CIMS Engineering Research Center Department of Automation Tsinghua University Beiiing 100084 China

ISBN: (纸本)0780378040

We introduce a new, simple and efficient evolutionary algorithm to multiobjective optimization problem, which based on neighborhood and archived operation (NAGA). The innovations contain two main parts: neighborhood identify procedure to obtain Pareto optimal solutions from the population and neighborhood crowding procedure to maintain the diversity of Pareto optimal solutions previously found. The neighborhood identify procedure is composed of two steps, first to identify the locally nondominated solutions from the population and then to obtain the global nondominated solutions among the locally solutions. The neighborhood crowding is introduced to maintain a widely distributed set of Pareto solutions along the Pareto optimal front, which through implementing a comparison among the neighborhood bounds of new identified Pareto solutions and those of solutions in the archive. The winners, which are not in any ranges of the solutions in the archive, will be copied to the archive. A well-tuned fitness assignment method is structured to guide the population converging to the true Pareto optimal front. This method is pragmatic compromise between the computational simplicity and efficiency. Four nicely balanced test problems are provided to check the performance of the approach. © 2003 IEEE.

关键词： Evolutionary algorithms

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Reuse of information as a base for development and verification of control programs for flexible manufacturing cells

Reuse of information as a base for development and verificat...

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IEEE International Workshop on Intelligent Robots and systems (IROS)

作者： J. Richardsson M. Fabian Control and Computer Systems Advanced Equipment Engineering Volvo Car Corporation Goteborg Sweden Control and Automation Laboratory Department of Signals and Systems Chalmers University of Technology Goteborg Sweden

Shortened product life-cycles decreases the output rate of manufacturing systems as the introduction of new products into the manufacturing system becomes more frequent. Improvements of the development process of manufacturing systems are needed to increase the output. Information handling and development of control programs based on information reuse are two of the most important improvement areas. These areas, among other things, can be a support for offline verification, which promises to directly increase the output rate due to shortening product introduction times. This paper deals with two problems of the many connected to enabling offline verification. First, a general control program structure, adapted to information reuse, is needed and secondly, the information necessary to generate the control programs needs to be defined. A method is proposed where information from the mechanical design of a cell, from the product, and from manual simulation are reused and automatically converted into control programs that schedule the work in a collision-free, deadlock-free and time-optimized way. The correctness of the generated programs is guaranteed by use of formal methods, simulation and an uncorrupted conversion of specifications into control programs.

关键词： Flexible manufacturing systems control systems Manufacturing systems Computer aided manufacturing Automatic generation control Automatic control Manufacturing automation Production Computer bugs systems engineering and theory

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