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control system DESIGN CONSIDERING A TRADEOFF BETWEEN EVALUATED UNCERTAINTY RANGES AND control PERFORMANCE

Asian Journal of control 2008年第1期1卷

作者： Y. Wakasa Y. Yamamoto Dept. of Applied Analysis and Complex Dynamical Systems Graduate School of Informatics Kyoto University Kyoto Japan. Yuji Wakasa was born in Okayama Japan in 1968. He received the B.S. and M.S. degrees in engineering from Kyoto university Japan in 1992 and 1994 respectively. From 1994 to 1998 he was a Research Associate in the Department of Information Technology Okayama University. Since April 1998 he has been a Research Associate in the Graduate School of Informatics Kyoto University. His current research interests include robust control and control system design via mathematical programming. Yutaka Yamamoto received his B.S. and M.S. degrees in engineering from Kyoto University Kyoto Japan in 1972 and 1974 respectively and the M.S. and Ph.D. degree in mathematics from the University of Florida in 1976 and 1978 respectively. From 1978 to 1987 he was with Department of Applied Mathematics and Physics Kyoto University and from 1987 to 1997 with Department of Applied System Science. Since 1998 he is a professor at the current position. His current research interests include realization and robust control of distributed parameter systems learning control sampled-data systems and digital signal processing. Dr. Yamamoto is a receipient of the Sawaragi memorial paper award (1985) the Outstanding Paper Award of SICE (1987) Best Author Award of SICE (1990) the George Axelby Outstanding Paper Award of IEEE CSS in 1996 Takeda Paper Prize of SICE in 1997. He is a Fellow of IEEE. He was an associate editor of Automatica. He is currently an associate editor of IEEE Transactions on Automatic Control Systems and Control Letters and Mathematics of Control Signals and Systems. He is a member of the IEEE the Society of Instrument and Control Engineers (SICE) and the Institute of Systems Control and Information Engineers.

This paper presents a design method of control systems such that a designer can flexibly take account of tradeoffs between evaluated uncertainty ranges and the level of control performance. The problem is reduced to a BMI problem and approximately solved by LMIs. The convergence of the proposed approximation is proved in a modified sense. A numerical example shows the effectiveness of the proposed method in comparison with the standard robust control.

关键词： control system design LMI BMI tradeoff curves

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Synthesis and Photocatalytic Capability of Cr- TiO2 film

Synthesis and Photocatalytic Capability of Cr- TiO2 film

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2007年纳米光电子学国际学术会议

作者： Xiaojuan Lu Duowang Fan Duojin Fan Hongzhong Liu School of Automation and Electric Engineering Lanzhou Jiaotong University Lanzhou 730070 People's MOE key lab of Opto-electronic Technology and Intelligence Controll Lanzhou Jiaotong University La Lanzhou Dachen Automatic Control System Co. Ltd Lanzhou 730070 and People's Republic of China State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong university Xi'an 710049

A TiO2 catalyst doped by Cr was prepared by the sol-gel method and characterized by UV-2550 and FS. The results reveal that the Cr6+-doped TiO2 film has the higher photocatalytic activity than pure TiO2 *** Semiconductor photocatalysts, mainly TiO2, have attracted much attention in last decade because of their potential application in the removal of many organic and inorganic pollutants in air or water. Many studies have been carried out on the application and modification of TiO2, and various photocatalytic reactors have been investigated according to respective application demands for the purification of air and water. In the water and wastewater treatment field, slurry reactor is the most common device because of its high specific surface area and good dispersion. However, the use of TiO2 slurry reactor is still limited mainly due to difficult separation of TiO2 particles from treated water. To overcome the problem, Titania beads, TiO2 based thin film, fiberglass loaded with titania, and encapsulated titania within a zeolite framework have been prepared and used in fixed bed. However, the activity of TiO2 photocatalyst is reduced to a considerable extent by these immobilization techniques because the effective surface area of photocatalysts is decreased considerably. The aim of this study is to obtain a magnetically separable photocatalyst, which is stable and easy to be prepared. In the work, Cr as magnetic cores was prepared by liquid catalytic phase transfer method at low temperature, and magnetically separable TiO2- Cr photocatalysts were synthesized. Their physicochemical properties and photocatalytic activity for degradation of methyl orange in water were investigated.

关键词： Chromium Water pollution Inductors Semiconductor films Wastewater treatment Slurries Magnetic separation Air pollution Purification Surface treatment

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Preparation of TiO_x Films by Cathode Multi Arc Ion and Its Performance

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兰州交通大学学报 2007年第6期26卷 163-164页

作者： Fan Duojin Fan Duowang Wang Chenglong Liu Hongzhong Lanzhou Dachen Automatic Control System Co. Ltd Lanzhou 730070 China key Laboratory of Opto-Electronic Technology and Intelligence Control Ministry of Education Lanzhou Jiaotong University Lanzhou 730070China State Key Laboratory for Manufacturing Systems Engineering Xi＇an Jiaotong University Xi＇an 710049 China

Experimental Procedure Fig.1 shows the custom-made Cathode Multi Arc Ion equipment,which is made up of three pars:CCS (computer contral system,Fig.1′s left part),Vacuum Chamber (Fig.1′s middle part) and Air Pump par... 详细信息

关键词：钛氧化物薄膜阴极多相电极离子制备性能

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Speed sensorless control with neuron MARS estimator of an induction machine

Speed sensorless control with neuron MARS estimator of an in...

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2006 2nd International Conference on Power Electronics systems and Applications, ICPESA

作者： Lei, Dong Dong, Yang Xiaozhong, Liao Department of Automatic Control Engineering Beijing Institute of Technology Beijing China Key Laboratory of Complex System Intelligent Control and Decision Ministry of Education Beijing China

ISBN: (纸本)9623675445

In the high speed range, vector control of rotor flux orientation of an induction machine implements good perfornance. However, the perfornance in low speed rang deteriorates because of the inaccurate estimation of rotor flux and speed. In this paper, modified voltage model for rotor flux estimation and neuron model-reference adaptive system (MARS) for speed estimation are used to improve the perfornance of speed sensorless vector control. To improve the accuracy of rotor flux estimation, the stator resistance is identified on-line. The experimental results show that the proposed scheme yields improved perfornance in low speed range.

关键词： Induction machine

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A simulation based decision tool to coordinate emergency services in a road accident

A simulation based decision tool to coordinate emergency ser...

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Summer Computer Simulation Conference 2006, SCSC 2006, Part of the 2006 Summer Simulation Multiconference, SummerSim 2006

作者： Guimarans, D. Ramos, J.J. Piera, M.A. Guasch, A. Department of Telecommunication and System Engineering LogiSim Universitat Autònoma de Barcelona 08193 Bellaterra Spain Department of System Engineering and Automatic Control LogiSim Universitat Politecnica de Catalunya 08028 Barcelona Spain

ISBN: (纸本)9781622763528

The coordination of emergency services in road accidents is essential to ensure a quick intervention in critical situations. The number and kind of resources assigned must be determined dynamically, as not all the accident variables are known when an alert is received. In addition, some decisions can only be token at the accident scene and may affect emergency service's distribution. This paper presents the model and the laboratory environment that is being developed for the design of real-time decision tools for the coordination of emergency services. Furthermore, it describes the major characteristics of an optimization algorithm proposed to tackle the emergency services coordination problem. This algorithm combines heuristic methods and Constraint Satisfaction Problem techniques in a two interactive phases procedure.

关键词： Emergency services

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Drinking water distribution system modelling - An approach to skeletonization

Drinking water distribution system modelling - An approach t...

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1st IFAC Workshop on Applications of Large Scale Industrial systems, ALSIS'06

作者： Duzinkiewicz, K. Ciminski, A. Department of Automatic Control Technical University of Gdansk ul. G. Narutowicza 11/12 80-952 Gdansk Poland Department of Control Engineering Intelligent Decision Support and Control System Group Gdansk University of Technology Narutowicza 11/12 80-952 Gdansk Poland

ISBN: (纸本)9783902661159

An optimisation based approach to simplification of a network model of pressurized drinking water distribution systems (DWDS), called skeletonization, has been proposed. DWDS simulation has been improved considerably during the last decades. There are two major aspects in modelling, monitoring and control of DWDS: quantity (water hydraulics) and quality. In the following paper the modelling of the water hydraulics in DWDS is considered. There is a need to build a simplified model of the drinking water network that preserves relation between flows and pressures in the main pipes and contains elements essentials for control - tanks, pumps, valves or others. The degree of simplification should be a compromise between needed model's accuracy and computational efficiency of the monitoring and control algorithms. Different approaches are proposed for DWDS model simplification. In the proposed method some parts of the network structure remain unchanged and the others are replaced by a simple radial structure. Parameters of the radial structure are calculated by solving dedicated optimisation problem. The simplification results based on the proposed method are illustrated by simulation case study for physical drinking-water distribution system and a comparison with the result obtained based on common sense method are presented. Copyright © 2006 IFAC.

关键词： Computational efficiency

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Sugar factory simulator for operators training

Sugar factory simulator for operators training

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作者： Merino, A. Mazaeda, R. Alves, R. Rueda, A. Acebes, L.F. De Prada, C. Department of System Engineering and Automatic Control Faculty of Sciences University of Valladolid C/ Real de Burgos S/n 47011 Valladolid Spain Center of Sugar Technology University of Valladolid Real de Burgos S/n Valladolid 47011 Spain

ISBN: (纸本)9783902661074

This paper presents the main features of a sugar factory training simulator currently used for control room operators training. This simulator is based on a realistic distributed real time simulation of the whole factory and in a mimic of the control system. It allows the familiarization of the operators with the process and control system as well as with the process information that they use in the real plant. The main aims of the simulator are: (i) to guarantee operators knowledge of the process, and its control system;(ii) to test potentially dangerous situations and (iii) to identify possible problems sources and learn to correct them. Copyright © 2006 IFAC.

关键词： Simulators

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Generalized contact force estimator for a robot manipulator

Generalized contact force estimator for a robot manipulator

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IEEE International Conference on Robotics and Automation (ICRA)

作者： J.G. Garcia A. Robertsson J. Gomez Ortega R. Johansson System Engineering and Automation Department Jaen University Jaen Spain Department of Automatic Control Lund University Lund Sweden

In this work, we present implementation and experiment of the theory of dynamic force sensing for robotic manipulators. In the robot manipulation context, end-effector contact forces may be difficult to measure due to tool interference, yet indirect measurement such as from wrist-mounted force sensors provide force measurement contaminated by inertial forces of the tool distal to the force sensor. In order to extract the contact force exerted by the robot, it is necessary to separate the contact forces from inertial forces. We propose a complete formulation and implementation of a new control strategy based on multi-sensor fusion with three different sensors - that is, encoders mounted at each joint of the robot with six degrees of freedom, a wrist force sensor and accelerometers - whose goal is to obtain a suitable contact force estimator. These new observers contribute to overcome many of the difficulties of uncertain world models and unknown environments, which limit the domain of application of contemporary robots used without external sensory feedback; in addition, the final observer can be applied to any kind of real robot system. An impedance control scheme was proposed to verify the improvement. The experiments were carried out on an industrial Staubli RX60 manipulator with open control system architecture

关键词： Force sensors Robot sensing systems Manipulator dynamics Force measurement Pollution measurement Service robots Interference Force control Sensor fusion Wrist

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Subspace-based blind identification of IIR systems

Subspace-based blind identification of IIR systems

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2006 16th IEEE Signal Processing Society Workshop on Machine Learning for Signal Processing, MLSP 2006

作者： Gómez, Juan C. Baeyens, Enrique Laboratory for System Dynamics and Signal Processing FCEIA Universidad Nacional de Rosario Riobamba 245 Bis 2000 Rosario Argentina Department of Systems Engineering and Automatic Control ETSII Universidad de Valladolid Paseo del Cauce s/n 47011 Valladolid Spain

ISBN: (纸本)1424406560

A new subspace method for the blind identification of Infinite Impulse Response (IIR), Single Input-Multiple Output (SIMO) systems represented using orthonormal bases with fixed poles, is presented in this paper. Basis coefficients are estimated in closed form, up to a scalar factor, by first computing the column space of the output Hankel matrix using Singular Value Decomposition (SVD), and then solving a Least Squares problem also resorting to an SVD. The performance of the proposed algorithm is illustrated through a simulation example. © 2006 IEEE.

关键词： Blind source separation

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Subspace-Based Blind Identification of IIR systems

Subspace-Based Blind Identification of IIR Systems

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IEEE Workshop on Machine Learning for Signal Processing

作者： Juan C. Gomez Enrique Baeyens Laboratory for System Dynamics and Signal Processing FCEIA Universidad Nacional de Rosario Rosario Argentina Department of Systems Engineering and Automatic Control Universidad de Valladolid Valladolid Spain

A new subspace method for the blind identification of infinite impulse response (IIR), single input-multiple output (SIMO) systems represented using orthonormal bases with fixed poles, is presented in this paper. Basis coefficients are estimated in closed form, up to a scalar factor, by first computing the column space of the output Hankel matrix using singular value decomposition (SVD), and then solving a least squares problem also resorting to an SVD. The performance of the proposed algorithm is illustrated through a simulation example.

关键词： Finite impulse response filter Stability Sensor arrays Signal processing Matrix decomposition Singular value decomposition Least squares approximation Signal processing algorithms Computational modeling Digital communication

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