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SIMPLE, ROBUST, SELFTUNING controlLER

APPLIED MATHEMATICS AND COMPUTATION 1995年第2-3期70卷 203-214页

作者： KOZAK, S HEJDIS, J Department of Automatic Control Systems Faculty of Electrical Engineering Slovak Technical University 812 19 Bratislava Ilkovicova 3 Slovakia

This paper proposes a robust method for automatic tuning of parameters of a discrete PID controller. The tuning rules for SISO and MIMO systems are based on automatic determination of critical gain and critical frequency from the estimated model parameters. The plant model can be expressed by a transfer function in continuous and/or discrete form or by differential and/or difference equation. A simple control law using Takahashi discrete form is proposed. Simulations results prove that it is easy to use being able to handle minimum and nonminimum phase plant as well.

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Hybrid ISMA/CDMA and CDMA/ISMA protocols for IWCC

Hybrid ISMA/CDMA and CDMA/ISMA protocols for IWCC

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International Conference on Universal Personal Communications

作者： F. Harmsze R. Prasad Circuits and Systems Group Faculty of Electrical Engineering Delft University of Technnology Delft Netherlands Telecommunications and Traffic Control Systems Group Faculty of Electrical Engineering Delft University of Technnology Delft Netherlands

This paper presents a novel multiple access scheme, which is a combination of inhibit sense multiple access (ISMA) and code division multiple access (CDMA), for the indoor wireless computer communications (IWCC). This new multiple access scheme is called hybrid ISMA/CDMA protocol. The performance of hybrid ISMA/CDMA protocol is evaluated in terms of throughput and the probability of packet errors. A similar protocol has been proposed earlier which is known as hybrid CDMA/ISMA protocol. A comparison between the two protocols is discussed and conclusions are drawn based on the computed results.

关键词： Multiaccess communication Base stations Access protocols Wireless communication Throughput Wireless application protocol circuits and systems Traffic control Wireless sensor networks Indoor environments

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Simplified analysis of the three-phase PWM switching converter

Simplified analysis of the three-phase PWM switching convert...

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International Conference on Industrial Electronics, control and Instrumentation

作者： N.A. Rahim T.C. Green B.W. Williams Department of Electrical Engineering Control and Systems Theory Faculty of Engineering University Malaya Kuala Lumpur Malaysia Department of Electrical & Electronic Engineering Imperial College London London UK Department of Computing Electrical Engineering Heriot-Watt University Edinburgh UK

Pulsewidth modulation, similar to voltage-space vector control in switches utilizing a field programmable gate array, is compared with PSpice simulation in a three switches converter is presented. The PSpice simulation is used in time domain simulation of the rectifier and inverter circuit. The PSpice PWM simulation modelled is compared with the experiment which is implemented in a field programmable gate array based on a carrier frequency of 19.2 kHz. The PWM is applied to the converter operated as a step-down converter where the output voltage can be controlled by the modulation index in the range of 0 to 1.5 V/spl circ//sub ph/. Simulation and experimental results are provided to demonstrate the effectiveness of the proposed model.

关键词： Pulse width modulation Pulse width modulation converters Switching converters Circuit simulation Switches Field programmable gate arrays Modulation coding Rectifiers Pulse width modulation inverters Frequency

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MRAC Algorithm for High Relative Degree Plants

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IFAC Proceedings Volumes 1995年第13期28卷 285-290页

作者： J. Murgaš M. Matejovič V. Červenka Department of Automatic Control Systems Faculty of Electrical Engineering and Information Technology Slovak Technical University Ilkovičova 3 812 19 Bratislava Slovakia.

The principal aim of this paper is to present a new algorithm for the control of continuous time linear systems with a large relative degree and unknown parameters. If the standard approach is used for these systems, the controller structure is very complicated and implementation is problematic. A comparative study of two classes of model reference adaptive control methods is also presented. Finally, simulation results are also presented to illustrate the effectiveness of the proposed method.

关键词： Model reference adaptive control Lyapunov methods

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FAULT-TOLERANT ASSOCIATE MEMORIES

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systems AND COMPUTERS IN JAPAN 1995年第7期26卷 1-12页

作者： FUJIWARA, E TANAKA, T Member Faculty of Engineering Tokyo Institute of Technology Tokyo Japan 152 Eui Fujiwara:received his B.S. and M.S. degrees in Electronics Engineering in 1968 and 1970 respectively and his Dr. of Eng. degree in 1981 all from Tokyo Institute of Technology. In 1970 he joined the NTT Musashino Electrical Communication Laboratories and engaged in developing PIPS-1 and PIPS-11 computer systems. In 1988 he joined the Department of Computer Science Tokyo Institute of Technology as an Associate Professor. In 1990 he became a full Professor. He was a Visiting Professor at the Center for Advanced Computer Studies the University of Southwestern Louisiana from June 1985 to July 1986. His current research interests include coding theory for computers fault-tolerant memories VLSI defect-toleranceand WSI systems. He is a co-author ofError Control Coding for Computer Systems(Prentice-Hall1989) EssentiaLF of Error-Correcting Coding Techniques (Academic Press 1990) and other books. Dr. Fujiwara received the Young Engineer Award from the I.E.I.C.E. in 1978 and the Teshima Memorial Research Award in 1991. He is a senior member of the IEEE and a member of the Information Processing Society Japan. Associate Member

Because of its capability of high-speed search, the associative memory (CAM) is expected to be used in a variety of information processing systems. In this paper, novel fault-tolerant techniques which are effective for on-line use are proposed for TLB which is an example of the application of CAM. First, fault and error models of the TLB consisting of the CAM part and the SRAM part are clarified. Then, the fault-tolerant techniques for these faults and errors, such as distance separable technique, cod-ing technique, simplified 1-out-of-n check and graceful degradation, are proposed. The distance separable technique which encodes the data stored in the CAM part is the one which masks the faulty CAM part and prevents errors from propagating to the subsequent circuits. The coding technique checks the one-to-one correspondence between the data in the CAM and those in SRAM by using the SEC-DED code with byte error detection capability, i.e., SEC-DED-SbED code, and at the same time it detects and corrects errors in the data stored in SRAM. The simplified 1-out-of-n check processes association errors. The graceful degradation gives a flag in the faulty memory section and prevents it from being used. The methods proposed in this paper are evaluated from area augmentation and error detection capability perspectives. The results show that the fault-tolerant TLB with 32 virtual address bits, 32 physical address bits and 128 entries gives single fault detection probability of nearly 99 percent with 28 percent area increase.

关键词： CAM TLB DISTANCE SEPARABLE TECHNIQUE CODING TECHNIQUE SIMPLIFIED 1-OUT-OF-N CHECK GRACEFUL DEGRADATION

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PARALLEL-FORM REALIZATION OF 2-D ADAPTIVE SEPARABLE-DENOMINATOR STATE-SPACE FILTERS

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ELECTRONICS AND COMMUNICATIONS IN JAPAN PART III-FUNDAMENTAL ELECTRONIC SCIENCE 1995年第1期78卷 44-55页

作者： MUNEYASU, M HINAMOTO, T Faculty of Engineering Hiroshima University Higashi-Hiroshima Japan 724 Mitsqji Muneyasu received his B.E. and M.E. degrees in Systems Engineering from Kobe University in 1982 and 1984 respectively. In 1984 he joined Oki Electric Industry Co. Ltd. in Tokyo. From 1990 to 1992 he was on the Faculty of Engineering Tottori University. He is currently a Research Associate in the Department of Electrical Engineering Hiroshima University. His research interest includes multidimensional digital signal processing. He is a member of the Information Processing Society of Japan. Members TaKao Hinamoto received his B.E. M.E. and Dr. of Eng. degrees in Electrical Engineering from Okayama University Kobe University and Osaka University in 1969 1971 and 1977 respectively. From 1972 to 1988 he was on the Faculty of Engineering Kobe University from 1988 to 1991 he was a Professor on the Faculty of Engineering Totton University and is currently Professor of Control Electronics the Faculty of Engineering Hiroshima University. His research interests include digital signal processing and system theory. He is a member of IEEE CAS ASSP and CS Society.

This paper treats the parallel-form realization of two-dimensional (2-D) adaptive state-space filters whose transfer functions are separable in the denominator. The adaptive filters are described by the Roesser local state-space (LSS) model, and the least mean squares (LMS) method is used here to adjust the filter parameters. First, the Roesser LSS model with separable denominator is realized in a parallel form. Then the stability condition of the tilter is shown. Next, the LMS method is employed to adjust the filter parameters in the parallel form. In addition, the computational time and the number of processors required for the realization are investigated. Finally, the adaptive filter is applied in numerical examples to the 2-D spatial-domain filter design and to the noise reduction of an image.

关键词： ADAPTIVE FILTER PARALLEL-FORM REALIZATION 2-D DIGITAL FILTER ROESSERS MODEL IMAGE PROCESSING

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Decentralized Variable Structure control of Complex systems

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IFAC Proceedings Volumes 1994年第11期27卷 227-232页

作者： V. Veselý D. Kalaš Slovak Technical University Department of Automatic Control Systems Faculty of Electrical Engineering Bratislava Slovakia Slovak Technical University Department of Control and Automation Faculty of Electrical Engineering Bratislava Slovakia

The paper considers the problem of stabilizing large scale dynamic systems (LSS) via decentralized controllers based on Variable Structure systems (VSS) and using the principle of dominant subsystems. The principle and applications for LSS are described and simulation test results on a two- machines power system with nonlinear model are presented.

关键词： Decentralized control diagonal dominance variable structure systems large scale systems

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Architecture driven computational ordering and code generation method for DSP compiler

Architecture driven computational ordering and code generati...

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IEEE Asia-Pacific Conference on circuits and systems

作者： J. Vilasdechanon K. Likit-Anurucks N. Sugino A. Nishihara Electronic Circuits and Systems Research LaboratoryDepartment of Electrical Engineering Faculty of Engineering Chiang Mai University Thailand Department of Physical Electronics Faculty of Engineering Tokyo Institute of Technology Tokyo Japan

A computational ordering and code generation method for DSP compiler, which take the target DSP architecture, i.e., the number of accumulators, bus structure and multi-operation instruction code, into consideration is proposed. By combining computation ordering and code generation into one step, a better outcome code of DSP compiler may be obtained. Although only /spl mu/PD 7720 is used as target DSP in this work, the method may be applied to other DSPs.

关键词： Computer architecture Digital signal processing Registers Digital signal processing chips Read-write memory Program processors Digital signal processors Hardware Read only memory Assembly

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Nonlinear Selftuning controller Based Upon Laguerre Series Representation

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IFAC Proceedings Volumes 1994年第11期27卷 391-397页

作者： Š. Kozák Department of Automatic Control Systems Slovak Technical University Faculty of Electrical Engineering Ilkovičova 3 812 19 Bratislava Slovakia

This paper addresses the design of a selftuning controller for linear and non-linear dynamic systems. Modelling of nonlinear dynamic systems is realized using the expanded Voltera kernels by orthonormal Laguerre functions in a continuous and a discrete form. A predictive nonlinear control law is derived on the base of the Laguerre polynomials in a recursive form. The proposed control law has many benefits (simple use. easy handling of varying time delay and nonminimum phase behaviour, etc.). The method outlined in this paper presents new trends in design of control of nonlinear plants using selftuning DDC algorithms. The theoretical part of the paper presents several modifications of modelling and control algorithms design yielding new results with proof of convergency properties for Laguerre spectra estimation procedure. Practical problems solutions are involved.

关键词： Selftuning control Laguerre series Wiener-Voltera series Predictive controller DDC-control1er Non linear systems

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The Supervisory control Problem Solved VIA Petri Nets

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IFAC Proceedings Volumes 1994年第11期27卷 339-344页

作者： B. Hrúz Slovak Technical University Faculty’ of Electrical Engineering Department of Automatic Control Systems 81219 Bratislava Ilkovičova 3 Slovak Republic

The supervisory control problem in the discrete event dynamic systems (DEDS) is formulated using input-state-output system structure. A class of the Petri nets is defined enabling an effective and practically useful representation of the structural and dynamic properties of DEDS. A solution of the supervisory control using the Petri nets and the corresponding reachability graphs is presented and illustrated on an example.

关键词： Discrete event dynamic systems supervisory control control system synthesis Petri nets reachability graph

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