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International Conference on Intelligent Transportation

作者： Zhu Li-xin Wang Fei-yue Intelligent Control and System Engineering Center Automation Institute of Chinese Academy of Sciences Beijing China Department of Systems & lndustrial Engineering University of Arizona Tucson Tucson USA

ISBN: (纸本)0780381254

Rapid advances in the real-time embedded operating systems necessitate the development of Internet oriented application specific embedded operating systems. The ASOS (application specific embedded operating systems) has now become a promising research direction of the embedded operating system. The paper clarifies the concept of the ASOS, and takes the embedded operating system applied in the traffic signal controller we are now developing to illustrate the main characteristics of the ASOS. Benefits from the CBSE (component-based software engineering) include system quality improvement, shorter time to market, integration of complex systems, etc. However, as for the embedded system, the component-based technology and theories still in an exploration period, though many projects are carried on. In this paper, we present the process of our approach to construct the ASOS based on the component technology.

关键词： Operating systems Embedded system Application software Hardware systems engineering and theory Intelligent transportation systems Real time systems Internet control systems Software quality

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Improving Tracking Performance on Disturbance-Rejection controllers

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IFAC Proceedings Volumes 2003年第18期36卷 41-46页

作者： Damir Vrančić Stanko Strmčnik Mikulas Huba J. Stefan Institute Department of Systems and Control Jamova 39 SI-1000 Ljubljana Slovenia FAX: +386-1-4257-009 Department of Automation and Control Faculty of Electrical Engineering and Information Technology Slovak Technical University SK-812 19 Bratislava Slovakia

Disturbance rejection performance is usually the most important aspect in designing controller in the process and the chemical industries. On the other hand, such tuned control loop may exhibit large overshoots on reference tracking. The only way to decrease overshoot is to use two-degrees-of-freedom (2-DOF) controllers. Unfortunately, reducing the overshoot usually results in slower tracking response when using some of the most common 2-DOF controller structures. This paper suggests using additional first-order filter on the set-point of the PI controller in order to improve tracking performance. The calculation of compensator's parameters is straightforward and can be easily performed in practice. Several examples confirmed the efficiency of the proposed approach.

关键词： PID control Magnitude Optimum controller Tuning Disturbance Rejection Tracking

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A fuzzy track-keeping autopilot for ship steering

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Proceedings of the Institute of Marine engineering, Science and Technology Part A: Journal of Marine engineering and Technology 2003年第2期 23-29页

作者： Omerdic, E. Roberts, G.N. Vukic, Z. Mechatronics Research Centre University of Wales College Newport United Kingdom University of Zagreb Faculty of Electrical Engineering and Computing Zagreb Croatia Department of Mechatronics United Kingdom IFAC Technical Committee on Marine Systems United Kingdom IFAC Technical Committee on Mechatronic Systems United Kingdom Department of Control Engineering University of Zagreb Faculty of Electrical Engineering and Computing Croatia IEEE Control Systems/Robotics Automation Society Croatia

In this paper a non-linear fuzzy autopilot for ship track-keeping is presented. The proposed autopilot has four inputs (actual and desired heading, rate of change of heading and offset from the desired path) and one output (command rudder angle). The track-keeping problem is decomposed into two subtasks: (i) followthe desired heading, and (ii) bring the ship onto the desired path and keep tracking. Internally, the autopilot consists of two autopilots that fulfil these tasks simultaneously. The proposed control scheme has been verified using a non-linear model of a Mariner-class vessel and steering mechanism under the influence of wave and current disturbances. Results presented show how such a control strategy enables improved tracking performance.

关键词： Ships

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A simulator for line-of-sight missile control and guidance systems: object-oriented design

A simulator for line-of-sight missile control and guidance s...

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IEEE Conference on Aerospace

作者： G.M. Dimirovski D.D. Mohenski S.M. Deskovski Institute of Automation & Systems Engineering at FEE Saints Cyril and Methodius University슠of슠Skopje Skopje Macedonia Department of Computer Engineering & Information Technologies Dogus University Istanbul Turkey Department of Information & Control Systems Military Academy Skopje Macedonia

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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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Robust strictly positive real synthesis of polynomial segments for discrete time systems

Robust strictly positive real synthesis of polynomial segmen...

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IEEE Conference on Decision and control

作者： Wensheng Yu Long Wang Yong Xiang Laboratory of Complex Systems and Intelligence Science Institute of Automation Chinese Academy and Sciences Beijing China Center for Systems and Control Department of Mechanics and Engineering Science Peking University Beijing China School of Engineering and Technology Deakin University Geelong VIC Australia

ISBN: (纸本)0780379241

By using the result of robust strictly positive real synthesis of polynomial segments for continuous time systems, it is proved that, for any two n-th order polynomials a(z) and b(z), the Schur stability of their convex combination is necessary and sufficient for the existence of an n-th order polynomial c(z) such that c(z)/a(z) and c(z)/b(z) are both strictly positive real. We also provide the construction method of c(z). Illustrative examples are provided to show the effectiveness of this method.

关键词： Robustness Polynomials Discrete time systems Continuous time systems Robust stability control system synthesis Transfer functions Research and development Laboratories Intelligent systems

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Improved results on robust stability of multivariable interval control systems

Improved results on robust stability of multivariable interv...

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American control Conference (ACC)

作者： Zhizhen Wang Long Wang Wensheng Yu Guoping Liu Laboratory of Complex Systems and Intelligence Sciences Institute of Automation Chinese Academy of Sciences Beijing China Center for Systems and Control Department of Mechanics and Engineering Science Peking University Beijing China School of Mechanical Materials Manufacturing Engineering and Management University of Nottingham UK

For interval polynomial matrices, we identify the minimal testing set, whose stability can guarantee that of the whole uncertain set. Our results improve the conclusions given by Kamal and Dahleh.

ISBN: (纸本)0780378962

For interval polynomial matrices, we identify the minimal testing set, whose stability can guarantee that of the whole uncertain set. Our results improve the conclusions given by Kamal and Dahleh.

关键词： Robust stability control systems Polynomials Automatic control Robust control Manufacturing automation Uncertainty Laboratories Intelligent manufacturing systems engineering management

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Parametric Lyapunov function approach to 2 analysis and control of linear parameter-dependent systems

Parametric Lyapunov function approach to 2 analysis and cont...

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作者： De Souza, C.E. Trofino, A. De Oliveira, J. Department of Systems and Control Lab. Nac. de Comp. Científica LNCC/MCT Av. Getúlio Vargas 333 25651-070 Petrópolis RJ Brazil Department of Automation and Systems Univ. Federal de Santa Catarina PO Box 476 88040-900 Florianópolis SC Brazil Department of Electrical Engineering Univ. do Estado de Santa Catarina 89223-100 Joinville SC Brazil

The problems of 2 analysis and control synthesis for linear continuous-time parameter-dependent systems are addressed. The admissible values of the parameters and their rates of variation are assumed to belong to a given polytope. Linear matrix inequality-based methods of 2 performance analysis and state feedback control are developed. Both the design of gain-scheduled and robust controllers are addressed. The proposed methods have the feature that stability as well as the guaranteed 2 performance cost are based on a parameter-dependent Lyapunov function which is quadratic on the system parameters. The controller implementation does not require online knowledge of the rate of variation of the parameters.

关键词： Matrix algebra

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Robust guaranteed cost filtering for a class of nonlinear systems

Robust guaranteed cost filtering for a class of nonlinear sy...

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International Conference on Information Fusion

作者： D.F. Coutinho K.A. Barbosa A. Trofino C.E. de Souza Department of Electrical Engineering Pont. University Católica do Rio Grande do Sul Rio Grande do Sul Brazil Department of Automation and Systems University Federal de Santa Catarina Florianopolis Santa Catarina Brazil Department of Systems and Control Laboratory Nac. Computer Cienífica-LNCC Petropolis Rio de Janeiro Brazil

ISBN: (纸本)0972184449

In this paper, we propose a deterministic approach to the robust filtering problem for a class of uncertain nonlinear systems. Based on polynomial Lyapunov functions and a relaxation technique, we derive linear matrix inequalities conditions that minimize an upper-bound on the finite horizon 2-norm of the estimation error for all admissible uncertainty and input signals (including disturbances and measurement noise). Through a simple redefinition of the Lyapunov matrix, we extended the results for the reduced-order case without considering non-convex rank constraints.

关键词： Robustness Costs Nonlinear systems State estimation Linear matrix inequalities automation Polynomials Lyapunov method Filtering theory Uncertainty

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

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IFAC Proceedings Volumes 2003年第7期36卷 7-18页

作者： Georgi M. Dimirovski Yuan-Wei Jing Jun Zhao Si-Ying Zhang Dogus University Department of Computer Engineering Faculty of Engineering Acibadem Kadiköy TR-34722 Istanbul Turkey Fax# +90-216-327-9631 SS Cyril and Methodius University Institute of Automation & Systems Eng. Faculty of Electrical Engineering MK-1000 Skopje R. of Macedonia Northeastern University Institute of Control Science School of Information Science & Eng. Shenyang Liaoning P.R. of China Fax# +90-24-2389-0912

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.

关键词： Complex composite systems fuzzy systems neural networks nonlinear systems

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