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International Conference on control of Oscillations and Chaos

作者： M. Di Berbardo D.P. Stoten Dept. of Eng. Math. Bristol Univ. UK Automatic Control Laboratory Department of Mechanical Engineering University of Bristol Bristol UK

This paper is concerned with the problem of controlling and synchronizing chaotic systems through an appropriately synthesized adaptive strategy, namely the minimal control synthesis (MCS) algorithm is used to solve the stated problem. First, a traditional control strategy is used, which does not rely on any explicit property of chaotic systems, except for the boundedness of chaotic evolution. Next, by assuming the plant to be chaotic, some properties of chaotic systems are exploited to achieve the control, as in the Ott-Grebogi-Yorke (OGY) method (1990). Hence, an adaptive control engineering approach is merged with the OGY method to control and synchronize chaotic systems.

关键词： control engineering Chaos control system synthesis control systems Adaptive control Programmable control automatic control Mechanical engineering Linear feedback control systems State feedback

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Neural network-based feedforward control of two-stage heat exchange process

Neural network-based feedforward control of two-stage heat e...

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IEEE International Conference on systems, Man and Cybernetics

作者： A. Blazina N. Bolf Dept. of Meas. & Autom. Process Control Zagreb Univ. Croatia Faculty of Chemical Engineering aud Techology Department of Measurement and Automatic Process Control University of Zagreb Zagreb Croatia

An approach to the neural network-based feedforward control of a two-stage heat exchange process is presented. When pressure change occurs in the distillation column, the disturbance causes a variation of material balance that produces undesirable material and heat imbalance. The task is fulfilled first by developing a mathematical model in a traditional way, followed by the implementation of a neural network multilayer feedforward-based controller. The dynamics and unsteady state are investigated.

关键词： Neural networks Feedforward neural networks Temperature control Manipulator dynamics Feedback control Three-term control Databases Convergence Liquids Spirals

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Adaptive Genetic Algorithms for FFN-Based Dynamic Identification

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IFAC Proceedings Volumes 1997年第11期30卷 1315-1319页

作者： Jinchun Wang Kiyoshi Wada Youxian Sunt National Lab of Industrial Control Tech. Zhejiang University Hangzhou 310027 P. R. China Dept. of Electrical System Engineering Kyushu University Hakozaki 6-10-1 Higashi-ku Fukuoka 812-81 Japan

An adaptive genetic algorithm (AGA) coded in a float number vector which can be potentially used to solve the problem of estimation of the interconnection weights in the large scale neural networks is easily implemented in MATLAB, and a framework of FFN based dynamic system identification using this algorithm is proposed in this paper. In the algorithm, a float number vector representation is used to naturally treat with the multiple parameters in real value and a mechanism of adapting the probability of mutation is introduced in order to avoid the premature convergence. The simulation experiments show that this algorithm outperforms the standard genetic algorithm coded in a binary string (SGA) both in convergent speed and in accuracy. Finally, a FFN-based model of a nonlinear dynamic system is trained by both the SGAs and the AGAs. and the comparative results are given to demonstrate the AGAs’ good performance and efficiency’.

关键词： system Identification Feedforward Networks (FFNs) Float Vector Coding Adaptive genetic algorithms (AGAs) Standard genetic algorithms (SGAs)

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Overview, current trends and latest results in estimating the effects of load modelling on power-system damping and stability

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EUROPEAN TRANSACTIONS ON ELECTRICAL POWER 1997年第2期7卷 107-113页

作者： Milanovic, JV [?]Jovica V. Milanovic (1967) received the Dipl.-Ing. (Elec.) and M.Sc. (Elec. Eng.) degrees from the University of Belgrade. Yugoslavia. in 1987 and I99 I respectively. One year he worked with “Energoproject-MDD”- Engineering and Contracting Co. in Belgrade as an engineer in designing power plants and substations. In late 1988 hejoined the Faculty of Electrical Engineering of the University of Belgrade first as an associate teaching assistant and then (since late 199 I) as teaching assistant at the Dept. of Power Converters and Drives. Between March 1993 and January 1996 he completed his Ph.D. at the University of Newcastle. Australia. at the Dept. of Electrical and Computer Engineering. Since February 1996 he is lecturer at the Department of Electrical Engineering and Computer Science at the University of Tasmania Austnlia. His major interests include synchronous machines and power system transients control and stability. (The University of Tasmania. Dept. of Electrical Engineering and Computer Science GPO Box 252-65 Hobart Tas 7001 Australia.Te1+61 362/262-753 Fax+61 369/262 136. e-mail: Jovica.Milanovic@eecs.utas.edu.au)

The paper presents the overview of load modelling for power-system damping and stability studies with main conclusions summarized from previous research. The attempt has been made to present a cross-section of the most exploited existing load models together with the most important conclusions drawn from their implementation in power-system stability programs. The current trends and latest results in the domain of damping of electromechanical oscillations in power systems are also presented. The effects of load dynamics on damping of electromechanical oscillations were analyzed on the basis of one of generic load models proposed in the past. The recent results further encourage investigation in this area and highlights the importance of proper load modelling.

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Identification and control for Nonlinear Dynamic systems by RBFNN

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IFAC Proceedings Volumes 1997年第11期30卷 717-722页

作者： Xiaohan Wu Jinchun Wang Jicheng Wang Kiyoshi Wada National Lab of Industrial Control Tech. Zhejiang University Hangzhou 310027 P.R.China Dept. of Electrical System Engineering Kyushu University Hakozaki 6-10-1 Higashi-ku Fukuoka 812-81 Japan. kyushu-u. ac.jp

Identification and control for nonlinear dynamic systems still remains a challenging issue. Neural networks based models and controllers have often been effective in representing fields. In this paper, identification capability of radial basis function neural networks (RBFNN) is integrated into nonlinear internal model control to obtain a new control strategy. The model of inverse of the process is identified by training RBFNN. The NIMC controller consists of a model inverse controller and a robustness filter. At last, the simulation results for a continuous stirred tank reactor process demonstrate the advantage of the performance of the new strategy over that of a conventional PID controller.

关键词： Neural Networks Radial Basis Function Networks Dynamic systems Internal Model control Inverse Dynamics control Nonlinear control

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Teaching Discrete Event control of Manufacturing systems

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IFAC Proceedings Volumes 1997年第12期30卷 261-266页

作者： O.C. Pastravanu A. Gürel F.L. Lewis Dept. of Automatic Control and Industrial Informatics Technical University of Iasi Str. Horia 7-9 6600 Iasi Romania Dept. of Electrical and Electronic Engineering Eastern Mediterranean University P.O. Box 95 Gazi Magosa Mersin 10 Turkish Republic of Northern Cyprus Automation and Robotics Research Institute The University of Texas at Arlington 7300 Jack Newell Blvd. S Fort Worth Texas 76118-7115 USA

controller design for Flexible Manufacturing systems (FMS) is addressed within a systems theory-basea framework, which allows the separation of the workcell (comprised of machines and resources to be controlled), and the controller (consisting of the decision-making scheduler). This point of view is particularly profitable for teaching FMS design to control engineering students, who are familiar with the feedback control principles. The design algorithm uses standard manufacturing engineering tools to produce a rule-based controller that is described mathematically in terms of matrix equations, yielding the Petri net and max/plus representations of the closed-loop FMS. This matrix approach is exploited to develop a MATLAB software which implements new functions for idempotent calculus in the semiring (R∪{-∞},max,+), and offers a large flexibility in changing the operating conditions and design specifications.

关键词： flexible manufacturing systems discrete-event systems Petri-net models max/plus models MATLAB simulation control education

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Extended algorithm of a fuzzy-set based power-system stabilizer with genetic algorithm tuning

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EUROPEAN TRANSACTIONS ON ELECTRICAL POWER 1997年第3期7卷 205-210页

作者： Pedram, MM Seifi, H [?]Mir Mohsen Pedram (1967) received his B.Sc. and M.Sc. degrees in Electrical Engineering from Isfahan University of Technology (Isfahadnn) and Tarbiat-Modarres University (Tehran/Inn) in 1990 and 1994 respectively. His research interests are power-system control neural networks genetic algorithms and their applications in power systems. He is currently with Tarbiat-Modarres University. (Dept. of Electr. Engng. T d i at-Modarres University P.O. Box I4 155-4838. Tehradlran Phone: +9821/8005035 Fax: +9821/8006544 E-mail: E-Pednm@netef.modares.ac.ir)

The application of fuzzy logic controllers to improve power-system damping behaviour has received some attention in the literature during the last few years. The paper presents an approach in which besides speed and its first derivative, the second derivative is applied to the Fuzzy-set based power-system stabilizer (PSS), so that a three-dimensional space with improved behaviour is formed. The parameters are then optimized by the new searching technique, the genetic algorithm. Excellent digital simulation results are demonstrated for a single machine infinite bus-bar systems.

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Future Needs for the control Theory in Industries–Report and topics of the control techllology survey in Japanese industry–

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IFAC Proceedings Volumes 1997年第9期30卷 281-286页

作者： Haruo Takatsu Toshiaki Itoh Mituhiko Araki Control System Center Yokogawa Electric Corporation 2-9-22 Naka-cho Musashino-shi Tokyo 180 Japan Production Technology Division Mitsubishi Chemical Corporation 2-5-2 Marunouchi Chiyoda-ku Tokyo 100. Japan Dept. Electrical Engineering Kyoto University Yoshida-Honmachi Sakyo-ku Kyoto 606-01 Japan

A survey on applications of control technologies in Japanese industries is made based on the inquiry investigation conducted in 1995 by SICE. To the inquiry investigation, 148 engineers from 110 factories responded and gave 148 examples of applications. The survey also makes use of the data of the similar investigation conducted in 1989 by JEMIMA for comparison purpose. Several statistics about characteristics of plants, areas of applications, advantage and disadvantage of each technology, expectations of engineers, etc. are given, which clarifies several features of the future needs for control theory.

关键词： control theory statistics of applications industrial needs

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Development of a portable closed-loop atracurium infusion system: systems methodology and safety issues

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INTERNATIONAL JOURNAL OF CLINICAL MONITORING AND COMPUTING 1996年第4期13卷 243-252页

作者： Mason, DG Linkens, DA Edwards, ND Reilly, CS Dept. Automatic Control & Systems Engineering University of Sheffield Sheffield UK Dept Surgical & Anaesthetic Sciences University of Sheffield UK

Safety of closed-loop drug infusion systems is an issue often raised as a matter of concern. As a result, many closed-loop control systems are reported in the literature merely as computer simulation studies and few ever reach the stage of physical realisation and formal clinical evaluation. We address the safety issues involved with such systems by describing the development of a portable closed-loop control system for atracurium-induced muscle relaxation. This is a safety-critical system particularly when applied to brain and eye surgery where movement could have serious deleterious effects. The benefits of closed-loop muscle relaxation in providing stable surgical operating conditions over a wide range of patient sensitivities while infusing the minimum amount of drug makes this a worthwhile aim and serves to demonstrate safety issues which are generally applicable to other closed-loop drug infusion systems. It is hoped that the described methodology will facilitate and encourage the clinical application of closed-loop drug infusion systems so that clinical staff and patients may receive the benefits of closed-loop drug therapy.

关键词： safety-critical system closed-loop drug infusion muscle relaxation neuromuscular blockade atracurium

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Static and dynamic modelling of a two-flexible-link robot manipulator

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ROBOTICA 1996年第0期14卷 289-300页

作者： Morris, AS Madani, A [a1]Dept. of Automatic Control & Systems Engineering University of Sheffield Mappin St. Sheffield SI 3JD (UK)

This paper is addressed at the difficulty of accurately modelling a two-flexible-link manipulator system, which is a necessary pre-requisite for future work developing a high-performance controller for such manipulators. Recent work concerned with the development of an accurate single-flexible-link model is first reviewed and then the expansion of a single-link model into a two-flexible-link system in a way which properly takes into account the coupling and interactions between the two links is discussed. The method of approach taken is to calculate the elastic and rigid motions of the links separately and then to combine these according to the principle of superposition. The application of the model developed is demonstrated in a simulated two-flexible-link system.

关键词： modelling robot two-flexible-link superposition principle

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