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European control Conference (ECC)

作者： T. Kleinert J. Lunze Ruhr-Universität Bochum Institute of Automation and Computer Control Universitätsstr. 150 D-44780 Bochum

State observation of distributed parameter systems pose the problem of coping with the infinite state dimension of the process models. In addition to this difficulty, the dynamics of Simulated Moving Bed (SMB) processes is described by partial differential equations which are governed by switching initial conditions or switching boundary conditions, respectively. Furthermore, due to the setup of SMB plants only limited measurement information of the process behaviour is available. To overcome these difficulties, a model of the wave fronts of the SMB concentration profiles is derived which comprises a linear time-variant discrete-time state-space model describing the form, position and propagation of the wave fronts. A new approach to the solution of the state observation problem is proposed which is based on this model. Simulations of a closed-loop controlled SMB process are presented to show the applicability of the developed observer in the surrounding of the stationary operating point.

关键词： Mathematical model Switches Observers Solvents Stationary state Process control Time measurement

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An intelligent automaton for the control of an active sludge process

An intelligent automaton for the control of an active sludge...

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IEEE International Conference on Industrial Technology (ICIT)

作者： R.E. King A. Stathaki F. Koumboulis N. Kouvakas Division of Systems and Control Department of Electrical and Computer Engineering University of Paros Patras Greece Computer Technology Institute Athens Greece Department of Automation Halkis Institute of Technology Halkis Greece

This paper describes the principles of an intelligent automaton for controlling the secondary stage of a wastewater treatment plant. The automaton has been implemented as a finite state machine that can be integrated into the existing supervisory control and data acquisition system of any wastewater treatment plant. Human knowledge, in the form of linguistic rules, is embedded in the automaton, which has been shown to be capable of controlling the process very satisfactorily in all but extreme conditions.

关键词： Automata Automatic control Application specific processors control systems SCADA systems Wastewater treatment Humans Process control Effluents Intelligent control

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Effects of network delay quantization in distributed control systems 5

Effects of network delay quantization in distributed control...

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5th IFAC International Conference on Fieldbus Systems and their Applications, FeT 2003

作者： Koller, Gerald Sauter, Thilo Rauscher, Thomas Vienna Univ. of Technology Automation and Control Institute Gusshausstrasse 27/E376 WienA-1040 Austria Vienna Univ. of Technology Institute of Computer Technology Gusshausstrasse 27/E384 WienA-1040 Austria LOYTEC electronics GmbH Stolzenthalergasse 24/3 WienA-1080 Austria

When control loops incorporate fieldbus systems, typical quality of service parameters like delay and jitter play an important role with respect to the performance of the control. Traditionally, the desired quality of the control defined the constraints for the network. Today, it is desirable to use existing networks and make the control robust enough to cope with the deficiencies of the fieldbus. This paper investigates the influence of a network with bounded delay distribution on the performance of a discrete time control loop. We find that delays of about the sampling period give rise to a particularly sensitive behavior of the controller. Furthermore, the overshoot amplitude (as a quality indicator) seems to depend linearly on the delay distribution of the network. which offers a convenient design criterion for the controller. Copyright © 2003 IFAC.

关键词： Real time control

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Fault-Tolerant control Structure to Prevent the Rollover of Heavy Vehicles

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IFAC Proceedings Volumes 2003年第5期36卷 441-446页

作者： Peter Gaspar Istvan Szaszi Jozsef Bokor Computer and Automation Research Institute Hungarian Academy of Sciences Kende u. 13-17 H-1111 Budapest Fax: +36 14667503 Department of Control and Transport Automation Budapest University of Technology and Economics Fax: +36 14633087

In this paper a combined control structure with an active antiroll bar control and an active braking control is developed to decrease the rollover risk of heavy vehicles. This control structure also results in a fault-tolerant system since in case of a failure an adequate tuning of the control mechanism guarantees the roll stability. The control design is based on LPV model of the vehicle in which the forward velocity and the lateral load transfer at the rear are selected as scheduling parameters. In the actual controlled system, the compensator also uses the output of a fault detection filter. The operation of the control mechanism is demonstrated in a double lane change maneuver

关键词： fault tolerant systems nonlinear control automotive control vehicle dynamics nonlinear models

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Composite systems control by combined math-analytical and FS/NN computing approach 3

Composite systems control by combined math-analytical and FS...

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3rd IFAC Workshop on Automatic Systems for Building the Infrastructure in Developing Countries, DECOM-TT 2003

作者： Dimirovski, Georgi M. Jing, Yuan-Wei Zhao, Jun Zhang, Si-Ying Dogus University Department of Computer Engineering Faculty of Engineering Acibadem Kadiköy IstanbulTR-34722 Turkey SS Cyril and Methodius University Institute of Automation and Systems Eng Faculty of Electrical Engineering SkopjeMK-1000 Macedonia Northeastern University Institute of Control Science School of Information Science and Eng. Shenyang Liaoning China

A control systems engineering approach, employing a two-level overall system architecture and different but compatible formalisms for system representation on the upper and lower levels, has been investigated in detail. One design alternative is based on employing fuzzy-system approximators and solving for the adaptive tracking of the given, arbitrary, desired system outputs. The other alternative is based on state equations of composite systems and the use of neural-network approximators to deal with uncertainties and control adaptation. In both alternatives similarity property of subsystems has been exploited. Both designs can be implemented within the standard computer process control technology, and are therefore believed to be promising in applied systems engineering. Copyright © 2003 IFAC.

关键词： Fuzzy systems

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3-D flame temperature field reconstruction with multiobjective neural network

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Chinese Optics Letters 2003年第2期1卷 78-81页

作者：万雄高益庆汪元美 Institute of Automation of Nanjing University of Aeronautics and Astronautics Nanjing 210016 Department of Test and Control Engineering Nanchang Institute of Aeronautical Technology Nanchang 330034 Department of Test and Control Engineering Nanchang Institute of Aeronautical Technology Nanchang 330034 Department of Test and Control Engineering Nanchang Institute of Aeronautical Technology Nanchang 330034 novel 3-D temperature field reconstruction method is proposed in this paper which is based on multi-wavelength thermometry and Hopfield neural network computed tomography. A mathematical model of multi-wavelength thermometry is founded and a neural network algorithm based on multiobjective optimization is developed. Through computer simulation and comparison with the algebraic reconstruction technique (ART) and the filter back-projection algorithm (FBP) the reconstruction result of the new method is discussed in detail. The study shows that the new method always gives the best reconstruction results. At last temperature distribution of a section of four peaks candle flame is reconstructed with this novel method.

A novel 3-D temperature field reconstruction method is proposed in this paper, which is based on multi-wavelength thermometry and Hopfield neural network computed tomography. A mathematical model of multi-wavelength thermometry is founded, and a neural network algorithm based on multiobjective optimization is developed. Through computer simulation and comparison with the algebraic reconstruction technique (ART) and the filter back-projection algorithm (FBP), the reconstruction result of the new method is discussed in detail. The study shows that the new method always gives the best reconstruction results. At last, temperature distribution of a section of four peaks candle flame is reconstructed with this novel method.

关键词： Mathematical models Neural networks Spectrum analysis

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The design of the FDI filter for the yaw-roll control of heavy vehicles

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IFAC Proceedings Volumes 2003年第5期36卷 435-440页

In this paper the Fault Detection and Identification (FDI) filter which identifies the different actuator and sensor failures is designed. The FDI filter design is based on the weighted H ∞ filtering. It uses the Linear Parameter Varying (LPV) model of the vehicle, in which the forward velocity is selected as a scheduling parameter. The LPV based FDI filter design is demonstrated in varies vehicle manoeuvres.

关键词： fault detection fault diagnosis automotive control vehicle dynamics nonlinear models

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A concept for On-Line Testing of Distributed Safety-Critical Supervisory Systems

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IFAC Proceedings Volumes 2003年第3期36卷 175-180页

作者： István Varga Tamás Bartha Alexandros Soumelidis Béla Katics System and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences H-15l8 Budapest POB 63 Hungary Reactor Refutrbishment Project Nuclear Power Plant Ltd. H-7031 Paks POB 71 Hungary

This paper presents the concept and practical realization of the testing methodology of safety-critical supervisory systems. The test concept utilizes the highly redundant nature of these systems to conduct test during the normal operation of the monitored process. The described principles have been implemented in the form of microcomputer-based test systems.

关键词： Automatic testing Availability Error detection Implementation Nuclear plants

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Effects of network delay quantization in distributed control systems

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IFAC Proceedings Volumes 2003年第13期36卷 291-298页

作者： Gerald Koller Thilo Sauter Thomas Rauscher Vienna Univ. of Technology Automation and Control Institute Gusshausstrasse 27/E376 A-1040 Wien Austria Vienna Univ. of Technology Institute of Computer Technology Gusshausstrasse 27/E384 A-1040 Wien Austria LOYTEC electronics GmbH Stolzenthalergasse 24/3 A-1080 Wien Austria

When control loops incorporate fieldbus systems, typical quality of service parameters like delay and jitter play an important role with respect to the performance of the control. Traditionally, the desired quality of the control defined the constraints for the network. Today, it is desirable to use existing networks and make the control robust enough to cope with the deficiencies of the fieldbus. This paper investigates the influence of a network with bounded delay distribution on the performance of a discrete time control loop. We find that delays of about the sampling period give rise to a particularly sensitive behavior of the controller. Furthermore, the overshoot amplitude (as a quality indicator) seems to depend linearly on the delay distribution of the network, which offers a convenient design criterion for the controller.

关键词： Distributed control Networks Real-time control Fieldbus

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Optimization of PM brushless DC motor drive

Optimization of PM brushless DC motor drive

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IEEE International Conference on Industrial Technology (ICIT)

作者： P. Crnosija T. Bjazic R. Krishnan Faculty of Electrical Engineering and Computing Department of Control and Comp. Eng. in Automation University of Zagreb Zagreb Croatia The Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA

Traditional approaches to controller designs that guarantee fast compensation of load torque and reference variations result in design iterations and most of the time in poorer response for load torque variations. In this paper a reference model for desired drive behavior generation and optimization methods has been applied to achieve controller integral time constant lower than the maximum time constant of the PM brushless DC motor drive. Presented simulation results show that using reference model for desired drive behavior generation, it is possible to determine optimal controller parameters for faster (10 time) and better (2 time) load torque compensation than in the case of traditional design of speed controller parameters. Response due to reference input with constrained overshoot has been achieved using a filter in the servosystem input. Thereby, the proposed method demonstrates the design of a speed controller that is optimal for both load torque and reference variations and its verification with simulation are accomplished for a permanent magnet brushless dc motor drive.

关键词： Brushless DC motors Torque control Optimal control Time factors DC generators Optimization methods Magnetic separation Filters Servosystems Design methodology

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