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International Conference on Intelligent Transportation

作者： Xiaoyan Gong Feiyue Wang Intelligent Control and Systems Engineering Center Institute of Automation Chinese Academy and Sciences Beijing China Institute of Automation Chinese Academy and Sciences Beijing China Advanced research in Complex Systems Department of Systems and Industrial Engineering of University of Arizona Tucson Tucson AZ USA

Research has shown nonparametric regression to hold high potential to accurately forecast short-term traffic flows. However, many fundamental questions remain regarding the ability of KNN-NPR(K nearest neighbor nonparametric regression) to meet real-time system requirements and adequate accuracy requirements. So this paper puts forward three improvements which are: effective traffic state vector selection method based on self-association analysis and association analysis; improved variable K search method based on "dense degree"; and advanced data structures based on a dynamic cluster method and hash-function transformation. A field test fully proves that with three improvements, KNN-NPR can adequately meet real-time system requirements and accuracy requirements.

关键词： Traffic control Real time systems Intelligent transportation systems Accuracy Automatic testing Integrated circuit testing Senior members Filtering algorithms Parametric statistics Databases

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Jerk limited time optimal control of multi-input systems

Jerk limited time optimal control of multi-input systems

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American control Conference (ACC)

作者： M. Muenchhof T. Singh Department of Mechanical and Aerospace Engineering SUNY at Buffalo Buffalo NY USA Institute of Automatic Control Laboratory of Control Systems and Process Automation University of Technology Darmstadt Darmstadt Germany

A design method for determining control sequences for rest-to-rest maneuvers of flexible structures with multiple actuators and multiple resonant modes is described. The problem formulation. is based on a pole cancellation approach with constraints on both the magnitude and the time rate of change of the control inputs. Time-optimality can be traded for an increased level of robustness with respect to modeling errors. Robustification is achieved by placing additional zeros of the controller on some or all of the resonant poles of the system.

关键词： Optimal control control systems Actuators Automatic control Resonance Sampling methods Aerospace engineering Design methodology Flexible structures Robustness

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A formal mapping of static information models into dynamic models for process planning and control purposes

A formal mapping of static information models into dynamic m...

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International Workshop on Discrete Event systems, WODES

作者： P. Falkman J. Nielsen B. Lennartson Control and Automation Laboratory Department of Signals and Systems Chalmers University of Technology Gothenburg Sweden Computer Systems for Design and Manufacturing Department of Production Engineering Kungliga Tekniska Högskolan Stockholm Sweden

A formal mapping between static information models and dynamic models is presented. The static information models are given according to an international standard for product, process and resource information exchange. The dynamic models are described as discrete event systems. The product, process and resource information is automatically converted into product routes and used for simulation, controller synthesis and verification. The focus in this paper is on resource booking problems. A high level language, which combines Petri nets and process algebra, is presented and used for specification of desired routes. A main implication of this methodology is to enable the reuse of process information when creating dynamic models for process control. This method also enables simulation and verification to be conducted early in the development.

关键词： Process planning Process control Automatic control Manufacturing systems Petri nets Algebra Signal mapping Manufacturing automation Computer aided manufacturing Manufacturing processes

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GLOBAL controlLER OPTIMIZATION USING HOROWITZ BOUNDS

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IFAC Proceedings Volumes 2002年第1期35卷 247-252页

作者： Carl-Magnus Fransson Bengt Lennartson Torsten Wik Kenneth Holmström Michael Saunders Per-Olof Gutman Control and Automation Laboratory Department of Signals and Systems Chalmers University of Technology Sweden Center for Mathematical Modeling Department of Mathematics and Physics Mälardalen University Västerås Sweden Systems Optimization Laboratory Department of Management Science and Engineering Stanford University Stanford CA USA Faculty of Agricultural Engineering Technion Haifa Israel

A procedure for global optimization of PID type controller parameters for SISO plants with model uncertainty is presented. Robustness to the uncertainties is guaranteed by the use of Horowitz bounds, which are used as constraints when low frequency performance is optimized. 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. The trade-off between stability margins, high frequency robustness and low frequency performance is then elucidated and, hence, the final choice of parameters is facilitated. The optimization problems are non-convex and ill-conditioned and we use a combination of new global and standard local optimization algorithms available in the TOMLAB optimization environment to solve the problem. The method does not rely on a good initial guess and converges fast and robustly. It is applied to a controller structure comparison for a plant with an uncertain mechanical resonance. For a given control activity and stability margin as well as identical tuning parameters it is shown that a PID controller achieves slightly improved low frequency performance compared to an ℋ ∞ controller based on loop-shaping. The reason for this somewhat surprising result is the roll-off in the ℋ ∞ controller, which adds additional high frequency robustness compared to the PID controller. Computationally, a factor of 10–20 has been gained compared to an earlier, less general, version of the procedure.

关键词： ℋ ∞ PID global optimization Horowitz bounds performance robustness

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INPUT RECONSTRUCTION BY MEANS OF SYSTEM INVERSION: APPLICATION TO FAULT DETECTION AND ISOLATION

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IFAC Proceedings Volumes 2002年第1期35卷 13-18页

作者： F. Szigeti J. Bokor A. Edelmayer Department of Control Engineering Faculty of Engineering University of Los Andes Mérida A.p. 11 La Hechicera Venezuela Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences Budapest Kende u. 13–17 H-1111 Hungary

This paper attempts to look at the fundamental problem of fault detection and isolation (FDI) in nonlinear systems. Using the idea of input reconstruction by means of dynamic inversion the authors first discuss the properties of input (or fault) observability in linear systems. The extension of the results to nonlinear systems as well as the mathematical conditions of the calculation of the inverse system, which provides the inverse in finite algorithmic steps, are given. The applicability of the inversion process to fault reconstruction in nonlinear systems is demonstrated.

关键词： Fault detection and isolation Input observability Input reconstruction Inverse system Linear and non-linear systems

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ROBUST STRICTLY POSITIVE REAL SYNTHESIS BASED ON GENETIC ALGORITHM

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IFAC Proceedings Volumes 2002年第1期35卷 349-354页

作者： Liangjun Xie Long Wang Wensheng Yu Yuhuang Qiu Laboratory for Complex Systems Institute of Automation Chinese Academy of Sciences Beijing 100080 P. R. China Center for Systems and Control Department of Mechanics and Engineering Science Peking University Beijing 10087 P. R. China

In this paper, a new numerical method based on Genetic Algorithm (GA) for robust Strictly Positive Real (SPR) synthesis is presented. The algorithm works well in coefficient space of continuous-time systems and is computationally efficient for some types of polynomial families, such as polynomial segments, interval polynomials and polytopic polynomials et al. The method can be easily extended to the discrete-time systems. Illustrative examples are provided showing that the method is rather effective for arbitrary given high-order systems.

关键词： Key words: Robustness Strict Positive Realness (SPR) Genetic Algorithm (GA) Robust Analysis and Synthesis

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MILESTONE REPORT COORDINATING COMMITTEE ON COMPUTER control

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IFAC Proceedings Volumes 2002年第1期35卷 217-225页

作者： Henk B. Verbruggen Jaehyun Park Wolfgang Halang George Irwin Janusz Zalewski Faculty of Information Technology and systems Delft University of Technology Delft the Netherlands Department of Automation Engineering Inha University Inchon Korea Faculty of Electrical Engineering Fern Universität Hagen Germany Intelligent Control and Systems Group School of Electrical and Electronic Engineering Queen's University Belfast UK Department of Electrical and Computing Engineering University of Central Florida Orlando USA

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On complex non-linear systems with symmetries: controllability preserving decomposition

On complex non-linear systems with symmetries: controllabili...

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IEEE International Conference on Electronics, Circuits and systems (ICECS)

作者： G.M. Dimirovski Y.-W. Jing J. Zhao T.D. Kolemisevska-Gugulovska Institute of Automation & Systems Engineering Faculty of Electrical Engineering Ss Cyril and Methodius University Skopje Macedonia Department of Computer Engineering Faculty of Engineering Dogus University Istanbul Turkey Institute of Control Science School of Information Science & Engineering Northeastern University Shenyang Liaoning China Institute of Automation & Systems Engineering Faculty of Electrical Engineering Ss Cyril and Methodius University Skopje Macedonia

In this paper, the problems of isomorphic decomposition and controllability of a class of nonlinear systems possessing symmetries, on the basis of quotient systems, is studied. The isomorphic decomposition formations of these systems are derived. Finally, it is shown that controllability of the original systems can be determined by that of the subsystems, which are obtained through isomorphic decomposition. The corresponding sufficient and necessary conditions are given. Two new theoretical results have been proved.

关键词： controllability Nonlinear control systems control systems Nonlinear systems Automatic control Information science automation systems engineering and theory Feedback Mathematical model

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An H/sub /spl infin// approach to fault detection for sampled-data systems

An H/sub /spl infin// approach to fault detection for sample...

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American control Conference (ACC)

作者： P. Zhang S.X. Ding G.Z. Wang D.H. Zhou E.L. Ding Department of Automation Tsinghua University Beijing China Institute for automatic control and complex systems University of Duisburg-Essen Duisburg Germany Department of Physical Engineering University of Applied Sciences Gelsenkirchen Germany

This paper studies fault detection problems for sampled-data (SD) systems. At first a discrete-time residual generator is constructed in two steps. With the help of introduced operators, the residual is analyzed quantitatively. Following the principle of integrated design, the design of fault detection system is then formulated as an optimization problem. Finally, two design procedures using H/sub /spl infin// optimization technique are provided and full decoupling problem is discussed.

关键词： Fault detection Design optimization Signal design Robust control Sampling methods Frequency domain analysis Transfer functions Centralized control control systems Signal analysis

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Decomposition of complex linear systems via hierarchical similarity structure

Decomposition of complex linear systems via hierarchical sim...

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IEEE International Conference on Electronics, Circuits and systems (ICECS)

作者： Y.-W. Jing G.M. Dimirovski J. Zhao M.J. Stankovski Institute of Control Science School of Information Science & Engineering Northeastern University Shenyang Liaoning China Institute of Automation & Systems Engineering Faculty of Electrical Engineering Ss Cyril and Methodius University Skopje Macedonia Department of Computer Engineering Faculty of Engineering Dogus University Istanbul Turkey

In this paper, the problem of system decomposition of complex linear dynamical systems, by exploiting the similarity property, is studied. System decompositions were sought in terms of similarity hierarchical structures. Three new theoretical results were proved. A method for constructing the transformation has been derived. The conditions for such decomposition of complex linear systems are given.

关键词： Linear systems control systems systems engineering and theory Design engineering Interconnected systems Robots Automatic control Information science automation Modems

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