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World Congress on Intelligent control and Automation (WCICA)

作者： Wang Yuping Liu Hailin Yiu-Wing Leung Faculty of Science Xidian University Xi'an China Department of Automatic Control Engineering South China University of Technology Guangzhou China Department of Computer Scienc Hong Kong Baptist University Hong Kong China

Genetic algorithms are one of the effective algorithms for hard optimization problems. They can escape from the local minima, however, the amount of their computation is often large. To decrease the amount of the computation and enhance the algorithms, the uniform design is combined into the genetic algorithm. The new genetic operator has the local-search property similar to that in traditional optimization techniques and needs a minimal amount of computation in certain meanings. Thus the new genetic algorithm can generate a diversity of population and explore the search space effectively. Moreover, the new algorithm is globally convergent. The numerical results also show the effectiveness of the new algorithm with its less computation, and higher convergent speed for all test functions.

关键词： Genetic algorithms Algorithm design and analysis Space exploration Scattering Optimization methods automatic control Genetic engineering Testing engineering management Operations research

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Self-Tuning PID controllers Based on Dynamics Inversion Method

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IFAC Proceedings Volumes 2000年第4期33卷 167-172页

作者： Vladimír Bobál Petr Dostál Jiří Macháček Miluše Vitečková Department of Automatic Control Faculty of Technology Zlin Brno University of Technology nám. TGM 275 762 72 Zlin Czech Republic Phone Fax: +420 67 721 1521 Department of Process Control and Computer Techniques University of Pardubice nám. Čs. Legií 565 532 10 Pardubice Czech Republic Department of Control Systems and Instrumentation Faculty of Mechanical Engineering Technical University of Ostrava 17. Listopadu 15 708 33 Ostrava-Poruba Czech Republic

A self – tuning PID controller algorithm has been derived in this paper. The process is identified by the regression (ARX) continuous – time model using the recursive least squares method (RLSM) with applied directional forgetting. The recursive parameter estimates of the continuous – time model (differential equation) are used to synthesis the PID controller. controller synthesis is designed on the basis of a dynamics inversion method. This method allows the tuning of standard analog and digital controllers for chosen types of controlled processes without or with time delay. The algorithm is suitable for the automatic setting of analog and digital PID controllers for deterministic processes or the adaptive control of stochastic and nonlinear processes. The analog modification PID controller has been verified by computer simulation.

关键词： continuous – time ARX model recursive least squares inverse dynamics control PID control self-tuning control

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Structure and performance evaluation of a replicated banyan network based ATM switch

Structure and performance evaluation of a replicated banyan ...

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IEEE Symposium on computers and Communications (ISCC)

作者： M.A. Youssef M.N. El-Derini H.H. Aly Department of Computer Science and Automatic Control Faculty of Engineering Alexandria University Egypt

Banyan networks are commonly used as interconnection structures in ATM switches. This paper is concerned with the replication technique which was applied to the standard banyan networks. We apply this technique to the plane interconnected parallel network (PIPN) which is a switch introduced previously as a better banyan-based interconnection structure. The normalized throughput of unbuffered and buffered replicated PIPN is analyzed analytically under uniform traffic model. We apply the simulation technique to verify the analytical results under the uniform traffic model and to study the performance of different heterogeneous traffic models. The performance is shown to increase significantly when the replicated PIPN is used which supports the idea of using this switch as a new high-performance ATM switch.

关键词： Asynchronous transfer mode Throughput Telecommunication traffic Traffic control Optical switches Bandwidth Very large scale integration computer science automatic control Analytical models

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Adaptive decentralized vibration control of a cable-stayed bridge in the presence of seismic excitation

Adaptive decentralized vibration control of a cable-stayed b...

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ASME 1999 Design engineering Technical Conferences, DETC 1999

作者： Luo, Ningsu Rodellar, Jose Sen, Manuel De La Veh, Josep Campus Montilivi P-ll Dept of Electronics Automatic Control and Computer Engineering University of Girona Girona17071 Spain Department of Applied Mathematics III School of Civil Engineering Technical University of Catalonia Barcelona08034 Spain Department of Electricity and Electronics Faculty of Science University of Basque Country Bizkaia Leioa48940 Spain

ISBN: (纸本)9780791819760

In this paper, an adaptive decentralized controller is presented to attenuate the transversal vibration of a flexible cablestayed bridge induced by seismic excitation, in which only local sensor information has been used to generate the control signal that is sent to the actuator. The dynamic behavior of the beam structure is characterized by a nonlinear mathematical model with interconnection terms, which was obtained by using technique of finite element. The controller design is made based on the principle of sliding mode such that a priori knowledge on the exact value of system parameters, structural disturbances and the seismiic excitation is not required. In particular, it is assumed that the upper and lower bounds for the seismic excitation are also unknown. The closed-loop robust stability has been achieved through the generation of a sliding motion in the system. Nu-merical simulation is done to illustrate the effectiveness of the proposed control scheme for a scaled model of the bridge subject to the Taft earthquake. © 1999 American Society of Mechanical Engineers (ASME). All rights reserved.

关键词： controllers

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Behavior of task scheduling algorithms with probabilistic module execution times

Behavior of task scheduling algorithms with probabilistic mo...

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IEEE Symposium on computers and Communications (ISCC)

作者： M. Kholief I. Awad M. El-Derini M. Nagi H. Ali Department of Computer Science Old Dominion University Norfolk VA USA Department of Computer Science and Automatic Control Faculty of Engineering Alexandria University Alexandria Egypt

Static task scheduling in distributed computing systems is a very complex problem and known to be NP-hard. This problem is even harder when the module execution times become probabilistic. In this paper we study the effect of probabilistic module execution times on the performance of task-scheduling algorithms. We show that in static task scheduling, for probabilistic module execution times, and in the existence of some factors there is no need to use an expensive task-scheduling algorithm. Given any two static task-scheduling algorithms that use deterministic module execution times in assigning task modules to the distributed system, the performance of these two algorithms will not remain the same when these module execution times become probabilistic rather than deterministic. We also study the effects of some factors an our results.

关键词： Scheduling algorithm Processor scheduling computer science automatic control Read only memory Distributed computing Heuristic algorithms State-space methods

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The ALEX Object Manager

The ALEX Object Manager

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IEEE Symposium on computers and Communications (ISCC)

作者： A.A. Saad G. Badr Computer Science and Automatic Control Department Faculty of Engineering Alexandria University Alexandria Egypt

Object-oriented database systems aim at meeting the data modelling, performance, cooperative design and version management requirements of current advanced applications, such as CAD (computer-aided design), CAM (computer-aided manufacturing), CASE (computer-aided software engineering), CIM (computer integrated manufacturing), hypermedia and expert systems. This paper presents the ALEX Object Manager, which is a part of the ALEX object-oriented database management system that is being developed based on the ODMG-93 standard. The system decomposition and process layout are presented, some implementation problems are discussed and the current status of the system is reported.

关键词： Database systems Design automation computer aided manufacturing computer aided software engineering computer integrated manufacturing Object oriented modeling engineering management Application software CADCAM Expert systems

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A Robust Non-Linear control Design for a Turbogenerator

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IFAC Proceedings Volumes 1997年第21期30卷 275-280页

作者： V. Vesely J. Simovec D.P. Papadopoulos Department of Automatic Control Systems Faculty of Electrical Engineering and Information Technology Slovak University of Technology Bratislava. Department of Electrical Computer Engineering Democritos University of Thrace 67100 Xanthi Greece

In this paper is presented a new approach to robust non-linear control design, which can guarantee a prescribed decay rate of exponential stability for known system uncertainties. The proposed approach doesn’t employ matching conditions. The non-linear power system with deterministic uncertainties is chosen as demonstration example.

关键词： robust non-linear exponential stability semi-linear power system

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A Method of Robust Fault Detection for Dynamic Systems by Using Quasi-ARMAX Modeling

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IFAC Proceedings Volumes 1997年第11期30卷 1157-1162页

作者： K. Kumamaru J. Hu K. Inoue T. Söderström Department of Control Engineering and Science Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka 820 Fukuoka Japan Department of Automatic Control and Systems Analysis Institute of Technology Uppsala University P.O.Box 27 Uppsala Sweden

This paper presents a model-based approach to fault detection of dynamic systems, which is robust to unmodeled dynamics. A “Quasi-ARMAX model᾿ is first proposed for describing nonlinear systems by incorporating a group of certain nonlinear structures into a linear ARMAX structure. The model can be used for a best linear approximation of the system, as well as for the estimation of resulting unmodeled dynamics, by a hierarchical implementation of recursive identification. Then robust fault detection is performed based on thresholding approach using Kullback discrimination information as fault detection index, in which the estimated unmodeled dynamics is incorporated.

关键词： Dynamic systems fault detection Kullback discrimination information modeling errors nonlinear systems robust performance

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Fault Detection of Nonlinear Systems by Using Hybrid Quasi-ARMAX Models

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IFAC Proceedings Volumes 1997年第18期30卷 1125-1130页

作者： K. Kumamaru J. Hu K. Inoue T. Söderström Department of Control Engineering and Science Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka 820 Fukuoka Japan. Department of Automatic Control and Systems Analysis Institute of Technology Uppsala University P.O.Box 27 Uppsala Sweden

This research is concerned with fault detection of nonlinear systems using Kullback discrimination information (KDI) as an index. A hybrid quasi-ARMAX model is proposed, which combines a linear ARMAX model and a multi-ARX-model based on interpolation. In the case where the faults occur on the ARMAX model part, a KDI-based "robust" fault detection is performed, in which multi-ARX-model part is treated as error due to nonlinear undermodeling. In other cases, the model is transformed into several local ARMAX models and fault detection is performed by using the KDI to discriminate each identified local model. In this paper, we mainly concentrate our discussion on the latter cases.

关键词： Nonlinear systems dynamic systems fault detection Kullback discrimination information quasi-ARMAX modeling local model

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On the numerical speed control of electrical drive systems using stepping motors

On the numerical speed control of electrical drive systems u...

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IEEE International Conference on Intelligent engineering Systems (INES)

作者： G. Baluta S. Resmerita Faculty of Electrical Engineering Department of Electric Drivcs and Power Electronics E2809CGh. Asachi E2809DTechnical University of Iasi Lasi Romania Faculty of Automatic Control and Computer Engineering Department of Automatic Control and Industrial Informatics E2809CGh. Asachi E2809DTechnical University of Iasi Lasi Romania

The paper focuses on the speed control of stepping motors in a closed-loop configuration. An incremental optical encoder is used as the position transducer, allowing the achievement of a minor loop. The numerical control algorithm is implemented using an IBM PC together with a specialized interface for stepper motors. The solution was obtained in two steps: the first was a nonlinear control law and the second was the improvement of the first one by using a PI part.

关键词： Velocity control Samarium automatic control Pulse circuits Optical feedback Nonlinear optics Transducers computer numerical control Digital control Pulse generation

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