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American control Conference (ACC)

作者： C.-M. Fransson B. Lennartson T. Wik P.-O. Gutman Control and Automation Laboratory Department of Signals and Systems Chalmers University of Technology Goteborg Sweden Faculty of Agricultural Engineering Technion-Israel Institute of Technology Haifa Israel

A procedure is presented for optimizing weight functions, when determining /spl Hscr//sub /spl infin// controllers by loop shaping for SISO plants with model uncertainty. The optimization is combined with an evaluation method to give a final tuning of the controller. The basic idea of both the optimization and the parameter tuning is to formulate separate criteria for low, mid and high frequency closed loop properties. By doing so, the trade off between stability margins, high frequency robustness and low frequency performance is elucidated and, hence, the final choice of parameters is facilitated. The resulting controller has the inherent optimality features of /spl Hscr//sub /spl infin// controllers as well as a robustness to explicit plant uncertainties, guaranteed by the use of Horowitz bounds. In the procedure, low frequency performance is optimized subject to these bounds and a restricted high frequency loop gain. The method is applied to two different uncertain plants, and the results are evaluated in terms of robust performance and evaluated against optimized PID controllers. The comparison shows that with identical tuning parameters and for a given control activity the /spl Hscr//sub /spl infin// controllers achieve better low frequency performance at the same time as the maximum sensitivity is superior.

关键词： Tuning Uncertainty Optimization methods Frequency locked loops Robust stability Optimal control Robust control Shape control Performance gain Three-term control

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Asset management solution based on PROFIBUS-PA profiles

Asset management solution based on PROFIBUS-PA profiles

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International Conference on Emerging Technologies and Factory automation (ETFA)

作者： M. Wollschlaeger C. Diedrich J. Muller U. Epple Ifak Institut f. Automation U Kommunikation e. V. Magdeburg Barleben Germany Chair of Process Control Engineering PLT RWTH Aachen University of Technology Aachen Germany

ISBN: (纸本)0780372417

Effective solutions for asset management become increasingly important in modern automation and control systems. They are especially required in the area of process control. The control systems used here usually consist of PLC-based networks, which are optimised concerning the special temporal and topological requirements of the process. Asset management functions have to be introduced to those systems, without any influence on the existing equipment. The paper shows an object-oriented solution based on PROFIBUS-PA device. By automatically evaluating a system structure and mapping the profile-relevant parameters of devices to proxy objects, different application modules for asset management functions can be implemented acting on these objects.

关键词： Asset management Automatic control automation control systems Process control Data mining Data engineering Field buses Actuators Programmable control

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An evaluation of algorithms for computing the covariance function of a multivariable ARMA process 6

An evaluation of algorithms for computing the covariance fun...

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6th European control Conference, ECC 2001

作者： Soderstrom, Torsten Sebek, Michael Jezek, Jan Kucera, Vladimir Henrion, Didier Department of Systems and Control Information Technology Uppsala University P O Box 27 UppsalaS-751 03 Sweden Center for Applied Cybernetics Faculty of Electrical Engineering Czech Technical University in Prague Technicka 2 PragueCZ-16627 Czech Republic Institute of Information Theory and Automation Academy of Sciences of the Czech Republic P 0 Box 18 PragueCZ-182 08 Czech Republic Toulouse France

ISBN: (纸本)9783952417362

Computation of an ARMA covariance function is a common ingredient in analysis and synthesis of various problems in stochastic control, estimation and signal processing. In this paper, we present an algorithm based on simple polynomial calculations. Compared to alternative strategies, its computational load increases slowly with the order of the process. Further, it shows good numerical robustness and applies to multivariable ARMA processes, even with complex-valued coefficients. © 2001 EUCA.

关键词： Stochastic systems

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Design and implementation of Automatic Parallel Detection Layer

Design and implementation of Automatic Parallel Detection La...

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IEEE International Conference on Systems, Man and Cybernetics

作者： M. Ahamed H. Eldeeb S. Nassar N. Bagherzadeh Computer Science Mathematics Department Faculty of Science Cairo University Cairo Egypt Electrical and Computer Engineering University of California Irvine Irvine CA USA Computer & Control Department Electronic Research Institute Head of Parallel and Distributed Systems team Cairo Egypt Chair of Electrical and Computer Engineering University of California Irvine Irvine CA USA

We develop a new software layer called the Automatic Parallel Detection Layer (APDL) for the automatic transformation from sequential to parallel code. The main interest, in this research, is the parallelism at loop level, because significant parallelism in programs almost invariably occurs in loops. The proposed APDL has five processes for code transformation: the sequential source code parser, data dependence analysis of this code, partitioning, scheduling both task and data, and generating parallel source code. Many cases have been studied to evaluate the performance of the developed layer. The performance is evaluated depending on the execution time of: the sequential code, the parallel programmer code, and the code output from APDL for the same case study. Performance results show that APDL greatly improves the execution time with respect to sequential execution time, and saves on the high cost of a parallel programmer.

关键词： Parallel processing Concurrent computing Programming profession Electronic mail Program processors Distributed computing High performance computing Computer science Automatic control Parallel programming

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Fuzzy Adaptive Output Tracking control of a Class of Composite Systems

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IFAC Proceedings Volumes 2001年第3期34卷 81-84页

作者： Bin Liu Yuanwei Jing Siying Zhang G.M. Dimirovski T.D. Kolemishevska Inst. of Control Science School of Information Science & Engg. Northeastern University Po. Box 321 Shenyang Liaoning 110006 P R. of China Department of Computer Engineering Faculty of Engineering DOGUS University Acibadem Kadikoy TR-81000 Istanbul Rep. of Turkey FAX#: + 90-216-327-9631 Inst.of Automation & Systems Engg. Faculty of EE SS Cyril #x0026 Methodius University Karpos 2 b.b. MK-91000 Skopje Rep. of Macedonia

In this paper the output-tracking problem of a class of composite nonlinear systems is studied. Composite system can be represented solely by models on the grounds of its inputs and measurable outputs. It is assumed that (i) the plant system belongs to aclass of composite non linear systems, and that the fuzzy logic control system applied can efficiently use adjustable parameters to approximate its non linear system function. The new theorem guarantees the synthesized indirect fuzzy adaptive control does ensure stable output tracking and possesses the ability to reduce the number of fuzzy rules.

关键词： Adaptive control composite systems fuzzy control MIMO systems nonlinear systems

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Optimal Pricing Strategies Based on Time Delay in Multi-Service Networks

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IFAC Proceedings Volumes 2001年第3期34卷 105-110页

作者： Fude Jin Yuanwei Jing Zhianhua Zhou G.M. Dimirovske K. Sohraby Institute of Control Science School of Information Science & Engineering Northeastern University Shenyang Liaoning 110006 P.R. of CHINA +86-24/2389-3138 Inst. of Automation & Systems Engg. Faculty of EE SSs. Cyril & Methodius University Karpos 2 B.B. P.D.Box 574:MK-1000 Skopje Rep.of Macedonia Fax# +90-216/327-9631 Dept. of Computer Science & Telecommunications University of Missouri-Kansas Kansas City M064110 USA

The problem of the pricing equilibrium in multi-service priority-based networks isstudied by using Stackelberg game theory. Some concepts of the game theory were revisited first. Then, the existing results on two-user, twolevel Nash problem was reviewed briefly. Following this background, a new one-leader, two-level, two-user incentive Stackelberg strategy was derived and proved by employing the time delay involved.

关键词： Communication networks game theory incentives optimal systems priority Stackelberg game

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Flat-based controlled fed-batch fermentation of the bacterium Photorhabdus luminescens

Flat-based controlled fed-batch fermentation of the bacteriu...

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IEEE Conference on control Technology and Applications (CCTA)

作者： P. Seydel H. Rock Faculty of Engineering Chair for Automation and Control Engineering Christian-Albrechts University Kiel Germany

In this paper, a model based fed-batch strategy for the cultivation of the bacterium Photorhabdus luminescens is proposed. The development of an appropriate trajectory for bacterial growth and substrate feed rate can be obtained using the theory of flat systems introduced by Fliess et al. (1992). To avoid deviations from a desired trajectory caused by model uncertainties or disturbances, a nonlinear controller is presented allowing closed loop control of the fermentation process.

关键词： Microorganisms Mathematical model Symbiosis Automatic control Nonlinear systems Feeds Biological system modeling Chemicals Insects Nonlinear dynamical systems

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Regularization and validation of neural network models of nonlinear systems

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e & i Elektrotechnik und Informationstechnik 2000年第1期117卷 24-31页

作者： I. Petrović M. Baotić N. Perić Faculty of Electrical Engineering and Computing Department of Control and Computer Engineering in Automation University of Zagreb Zagreb Croatia

A characteristic feature of the neural network models is the large number of parameters. A model offering many parameters usually gives rise to problems, and the variance contribution to the modeling error might be very high. Therefore, it is crucial to find the model with the optimal number of parameters. In this paper two techniques of selection of the optimal number of model parameters are described and compared: explicit and implicit regularization techniques. Model validation forms the final stage of an identification procedure with the aim of assessing objectively whether the identified model agrees sufficiently well with the observed data. In this paper the reliability of the correlation-based validation tests and the χ2-test is analyzed.

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Adaptive Neuro controller for a Precise Maneouvring of Underwater Vehicle

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IFAC Proceedings Volumes 2000年第21期33卷 173-178页

作者： Zoran Vukić Bruno Borović Boris Tovornik Department of Control and Computer Engineering in Automation University of Zagreb Control Engineering Department Brodarski institute d.o.o. Institute of Automation University of Maribor Faculty of Electrical Engineering and Computer Science

A neuro controller for high precision manoeuvring of underwater vehicles require special attention to a number of factors including thruster and vehicle’s nonlinearities, couplings which exist between various degrees of freedom as well as effects of the sea currents. The neuro control system for underwater vehicle maneouvring described here is based on the conventional controller supported with the so called adaptive neural network.

关键词： neural networks underwater vehicle trajectory guidance

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Pole Placement controller Design Based on Fuzzy Process Model

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IFAC Proceedings Volumes 2000年第28期33卷 219-224页

作者： Robert Cupec Nedjeljko Perić Ivan Petrović Department of Control and Computer Engineering in Automation Faculty of Electrical Engineering and Computing university of Zagreb Unska 3 10000 Zagreb Croatia

An explicit self-tuning controller based on the Takagi-Sugeno fuzzy model of the process is proposed. The fuzzy model is represented as a linear regression model whose parameters are functions of some of the process variables. Such a model can be considered as a linear time-varying model whose parameter values are known at every moment. The pole placement design procedure modified for time-varying systems is applied to obtain the polynomial controller parameters that provide the desired closed-loop poles. The proposed algorithm is very simple, and thus suitable for on-line controller design in adaptive control systems.

关键词： fuzzy control fuzzy modeling adaptive control

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