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Fault Detection of Large Parameter Changes in a Wastewater Plant

IFAC Proceedings Volumes 1994年第5期27卷 153-158页

作者： M.J. Fuente P. Vega M.B. Zarrop Dept. Ingeniería de Sistemas y Automatica. Facultad de Ciencias Universidad de Valladolid C/Prado de la Magdalena S/N 47011 Valladolid SPAIN Control System Centre Department of Electrical Engineering and Electronics University of Manchester Institute of Science and Technology. Manchester M60 1QD U.K.

This report deals with the detection and diagnosis of faults (FDD) when they develop in different parts of a wastewater treatment plant, situated in Manresa, Spain. When a fault occurs estimates of parameters in a non-linear mathematical model of the plant change. Some methods for detection and tracking the values of different parameters are proposed, where only large parameter changes are considered in this work. The methods have a common structure with three basic elements: a basic identification algorithm, a detector of the parameter changes and an adaptive procedure for improving the tracking capability of the identifier. A set of simulation experiments are presented in order to compare them.

关键词： Fault Detection and Diagnosis biotechnology wastewater plant estimation algorithms RLS

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Modelling and verification of hybrid systems: A case study 4

Modelling and verification of hybrid systems: A case study

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4th Annual Conference on AI, Simulation, and Planning in High Autonomy systems, AIS 1993

作者： Nadjm-Tehrani, S. Stromberg, J.-E. Dept. of Computer and Information Science Linkoping University LinkopingS-58183 Sweden Div. of Automatic Control Dept. of Electrical Engineering Linkoping University LinkopingS-58183 Sweden

ISBN: (纸本)0818640200

The problem of correctness and timing of reactions of an agent in interaction with a physical environment is addressed. To this end, a method based on composition of separate models of the software and the environment is used. To use available methods within the field of software verification, discrete representations of the continuous components are described systematically. A nontrivial case study within the domain of road traffic is used to illustrate the derivation of discrete models without losing information relevant to the verification task. The different modeling stages involved are shown first within an untimed formalism, and then in a formalism incorporating quantitative time. © 1993 IEEE.

关键词： Hybrid systems

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Genetic-based minimum-time trajectory planning of articulated manipulators with torque constraints

Genetic-based minimum-time trajectory planning of articulate...

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IEE Colloquium on Genetic Algorithms for control systems engineering

作者： K.K. Chan A.M.S. Zalzala Dept. of Automatic Control & Syst. Eng. Sheffield Univ. UK Robotics Research Group Department of Automatic Control and Systems Engineering University of Sheffield Sheffield UK

This paper is concerned with introducing a genetic-based algorithm for the minimum-time trajectory planning of articulated robotic manipulators. The planning procedure is performed in the configuration space and respects all physical constraints imposed on the manipulator design, including the limits on the torque values applied to the motor of each joint of the arm; consequently, the complete nonlinear dynamic robot model is incorporated in the formulation.< >

关键词： Genetic algorithms Nonlinear systems Motion-planning Robots

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Fading Noise Reduction Effect Through the Short Time DFT Compander

Fading Noise Reduction Effect Through the Short Time DFT Com...

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International Conference on Signal Processing(ICSP’93)

作者： Masahichi KISHI Xiaohui YUAN Information Network Engineering AIT YagusaToyotaAichi470-03JAPAN Dept. of Automatic Control Southeast University

Signals transmitted over poor radio channels are interfered by fading noise to be degraded in speech *** short time DFT(ST DFT) compander has successfully excluded envelope detection owing tn(?)mploying concept of instantaneous spectrum instead of employing approximated AM demodulation in realizing the envelope *** ST DFT compander is able to reduce fading noise to improve speech quality over poor radio channels without any *** ST DFT compander is discussed in this paper to optimize their structures and is also discussed to be sufficient in noise reduction both from the -oretical analysis and computer simulations.

关键词： DFT Fading Noise Reduction Effect Through the Short Time DFT Compander

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Optimum pairing and ordering conditions for simultaneous reduction in total capacitance, sensitivity and output noise of cascade SC filters

Optimum pairing and ordering conditions for simultaneous red...

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1992 IEEE International Symposium on Circuits and systems, ISCAS 1992

作者： Zhiqiang, M.A. Nakayama, Kenji Yamamoto, Gaishi Department of Electrical and Computer Engineering Faculty of Technology Kanazawa University Kanazawa920 Japan Faculty of Engineering Kanazawa Institute of Technology Ishikawa921 Japan Dept. of Automatic Control Engineering Central-South University of Technology Changsha China

ISBN: (纸本)0780305930

This paper presents optimum pairing and ordering (P/O) conditions for simultaneous reduction in total capacitance, sensitivity and output noise of cascade SC filters. First, investigating relations among conditions proposed for minimizing these three parameters independently, termed, CTmin, Smin and Nmin conditions, we make it clear that there is no P/O assignment with which the three parameters can be simultaneously minimized. Then we verify that Nmin condition is valid in reducing two other parameters. Trade-off optimum conditions are proposed by combining Nmin with Smin and CTmin. These conditions can limit the number of P/O assignments, in which an optimum P/O assignment for simultaneous reduction of three parameters can be searched out easily. Depending upon applications, the trade-off optimum condition can be slightly modified by adjusting the proportion of CTmin Smin and Nmin. Efficiency of the proposed trade-off optimum conditions is confirmed through computer simulation using several kinds of filters. © 1992 IEEE.

关键词： Capacitance

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Simulation environment for an autonomous and decentralized multi-agent robotic system

Simulation environment for an autonomous and decentralized m...

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1992 IEEE/RSJ International Conference on Intelligent Robots and systems, IROS 1992

作者： Habib, Maki K. Asama, Hajime Ishida, Yoshiki Matsumoto, Akihiro Endo, Isao Control and System Eng. Dept. University of Technology Baghdad Iraq Institute of Physical and Chemical Research Chemical Engineering Lab. Hirosawa 2-1 Wako-shi Saitama351-01 Japan Information Network System Operation Center University of Tokyo Japan Dept. of Mechanical Engineering Faculty of Engineering Toyo University Japan

ISBN: (纸本)0780307372

An autonomous and decentralized system called ACTRESS (ACTor based Robot and Equipment Synthetic system) is being under development as an intelligent robot system which can execute high level tasks. ACTRESS is composed of multiple robotic agents. Each robotic agent is called "robotor". A robotor may be a robot, a computing system and any other equipments. While researching in this field, many research issues need to have solutions, such issues may include, the communication among the agents and protocols, cooperation among a group of' agents, describing the tasks to be executed, multi-agent motion planning, multi-agent task planning, task description, human interface role, solv ing deadlocks ... etc. The aim or this paper Ls to develop a simulation environment for an autonomous and decentralized multi-agent robotic system. For this purpose, it is necessary to simulate and analyze the main functions of each agent, design and analysis of the actions to be carried out by each agent, analyzing their real time behavior with a variety of situations considering their environment and the treatment of unexpected events. Also, it is necessary to find out an efficient strategy to realize effective means for the agents to form a cooperating manner that support task execution and problem solving. In parallel with the mentioned purposes the ACTRESS structure is simulated as functions and behavior using the developed simulation environment. This simulation includes a roup of mobile robots, human interface and global environment manager. Then, software integration that deal with various aspect of the overall problem is developed. Different experiments are performed to analyze the performance or each individual robotor and the overall system. © 1992 IEEE. All rights reserved.

关键词： Intelligent robots

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Voting Software for Fault-Tolerant Aircraft Flight control systems

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IFAC Proceedings Volumes 1992年第20期25卷 87-92页

作者： Julian M. Bass Peter J. Fleming Dept. of Automatic Control and Systems Engineering University of Sheffield P.O. Box 600 Mappin Street Sheffield SI 4DU U.K.

An intelligent and robust voting service is proposed. The novel voting service, is capable of forming a consensus based on performance of redundant applications in the value, time and reliability *** voter is distributed using a hot backup approach to ensure timely recovery in the event of voter failure. Specification diversity is advocated in order to improve upon the effectiveness of design diversity. The voter is designed to be a system building block, embedded in a framework of design tools which will allow the developer to express control concepts, such as deadlines, priorities, re-plication and voting.

关键词： Real-Time systems Distributed systems Fault-Tolerance Voting Software Fault-Tolerance

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Harmonic insertion in PWM inverter drive schemes

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European Transactions on Electrical Power 1992年第3期2卷 143-151页

作者： Theocharis, J. Petridis, V. Dr.-Ing. John Theocharis (1956) graduated as an Electrical Engineer from Aristotelian University of Thessaloniki.Greece in 1980. From 1980 to 1985 he has been with the scientific staff of the Department of Electrical Engineering at the Aristotelian University where he received the Ph.D. degree in 1985. Since 1986 he is working as a lecturer and in 1990 he became assistant professor at the Department of Electronics and Computer Engineering in the m e university. His research activities include control power electronics and electrical motor drives. Recently he is working with the Neural Network Systems with applications to field oriented control problems. Aristotelian University of Thessaloniki School of Engineering Faculty of Electrical Engineering Dept. of Electronics & Computer Engineering P.O. Box 438 GR-Thessalonikil/Greece.T+3131/219784Fax + 3031/274868) Prof. Dr.-Ing. Vasilis Petridis (1946) graduated from National Technical University of Athens Greece in 1969.He obtained the M.Sc. and the Ph.D. in electronics and systems from the University of London in 1970 and 1974. respectively. H i s interests include applied automatic control neural networks drives dynamic systems robotics etc. He is currently professor in the Department of Electronics and Computer Engineering of the University of Thessaloniki. (Aristotelian University of Thessaloniki. School of EngineeringFaculty of Electrical Engineering Dept. of Electronics & Computer Engineering P.O. Box 438. GR-ThessaloniW Greece T+3031/219784.Fax+3031/274868)

The procedure of harmonic insertion is generalized in this paper. Analytical expressions of the voltage spectra are derived. The insertion of the 3rd harmonic to the modulating signal, which is of particular interest, is considered as a special case. It is demonstrated in this case that the fundamental harmonic component of the phase and the line‐to‐line voltage is not affected by the insertion of the 3rd harmonic for sufficiently high values of the chopping ratio. However it has been shown that the higher harmonic spectrum is significantly improved as compared to the case of pure sinusoidal modulation. For different values of the fundamental component the optimal values of the amplitude of the third harmonic to be inserted have been calculated so that the distortion factor of the higher harmonic spectrum is minimized. Other cases of harmonic insertion are also considered which provide spectrum efficiency improvement. Experimental results are given which have been obtained by means of a microcomputer controlled PWM generator constructed for this purpose. Copyright © 1992 John Wiley & Sons, Ltd.

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Enhanced Robustness for Pitch Pointing Flight Using Sliding Mode control

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IFAC Proceedings Volumes 1991年第1期24卷 369-374页

作者： M.E. Penati G. Bertoni C. Chen Electronics Computer Science and System Theory Dept. University of Bologna Viale Risorgimento 2 40136 Bologna Italy Dept. of Automatic Control Nanjing Aeronautical Institute Nanjing PRC

This paper proposes a methodology of combining eigenstructure assignment, feedforward gain with sliding mode control technique to realize an enhanced robust pitch pointing flight control system. This control system can track step input commands without error and it turns out to be consistently robust against parameter variations and external disturbances. The design methodology is illustrated by application to an AFTI/F-16 aircraft.

关键词： C.C.V. (A.C.T.) V.S.S. Sliding Mode Decoupling Robustness

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A practical application of a numerical optimization technique in the feedmill industry

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engineering Optimization 1991年第1-3期18卷 107-120页

作者： Ramon, H. Vingerhoeds, R.A. Netten, B.D. Noldus, E. Catholic University of Louvain Dept. of Agricultural Engineering Leuven Kardinaal 3030 Mercierlaan 92 Belgium State University of Ghent Automatic Control Laboratory 9710 Gent - Zwijnaarde Grotesteenweg Noord 2 Belgium

The cow model of Meijer describes a mathematical relation between the predicted daily milk production and the corresponding feed intake needed for lactating cows. The milk production is a function of several parameters defined for each cow. Used in least cost calculations of daily rations, an optimization problem is obtained, which consists of one highly non-linear equality constraint, together with several linear inequality constraints. Their number required in the optimization can vary and depends on the user’s choice. The cost function itself gives a linear relation between the prices of the different forages mixed in the optimal blend. The optimization result has been implemented with the aid of Augmented Lagrange Functions with a view to apply the program in the feedmill industry. © 1991, Taylor & Francis Group, LLC. All Rights Reserved.

关键词： augmented Lagrange method cow-model of Meijer Numerical optimization quasi-Newton method

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