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5th International Conference on control and Automation, ICCA'05

作者： Zhang, Huanshui Duan, Guangren Xie, Lihua Harbin Institute of Technology HIT Campus Shenzhen University Town Xili Shenzhen 518055 China Center for Control Theory and Guidance Technology Harbin Institute of Technology Harbin 150001 China BLK S2 School of Electrical and Electronic Engineering Nanyang Technological University Singapore 639798 Singapore

ISBN: (纸本)0780391381

Although the problem of linear quadratic regulation has been well studied for discrete linear systems without delays or with only a single input delay in the past decades, the same problem for systems with multiple input delays remains to be solved. This paper aims to present a complete solution to the LQR problem for systems with multiple input delays. It shall be shown that the problem is dual to that of fixed-lag smoothing for a backward system without involving delays. Thus, the optimal LQR controller can be obtained by computing the gain matrices of the standard fixed-lag smoothing. An explicit solution for the LQR problem is given in terms of the solution of a Riccati difference equation. © 2005 IEEE.

关键词： Linear systems

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Delay dependant H∞ control for neural systems with mixed delays

Advances in Modelling and Analysis C

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Advances in Modelling and Analysis C 2005年第5-6期60卷 13-23页

作者： Yang, Fan Zhang, Quing-Ling Institute of Systems Science Northeastern University Shenyang Liaoning 110 004 China Dept. of Mathematics Tonghua Teachers' College Tonghua Jilin 134 002 China Northeastern University Department of Control Theory and Control Engineering

A delay-dependent H∞ control problem for linear neutral systems with mixed delays is investigated. The purpose is to design a state-feedback control laws such that the closed-loop system is asymptotically stable and the H∞ norm of the closed-loop transfer function from the disturbance to the controlled output is not more than a prescribed upper bound. In terms of linear matrix inequality and taking a new Lyapunov-Krasovsii functional, a new sufficient condition which guarantees the asymptotical stability of the closed-loop system is given. Furthermore, one sufficient condition for the existence of a new delay-dependent H ∞ state -feedback controller is also shown. A numerical example is given to demonstrate that our new results are less conservative than existing results and effectiveness. Naturally, the results which we obtained are the extended of some results for existing linear delay system.

关键词： control theory

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Fractional polynomials and nD systems

Fractional polynomials and nD systems

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： K. Galkowski A. Kummert Faculty of Electrical Information and Media Engineering Communication Theory University of Wuppertal Germany Institute of Control and Computation Engineering University of Zielona Gora Poland

In this paper, the possibility of employing the 2D, and more generally nD systems approach for the analysis of fractional (more generally real) degree systems in both the commensurate and non-commensurate cases is shown. This approach effects in the significant reduction of a problem overall dimensionality, and in the second case, a 2D approach even opens the possibility of a stability analysis.

关键词： Polynomials Neodymium Transfer functions Communication system control control systems control engineering computing Information analysis Stability analysis Mathematics Difference equations

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Analysis of One and Two Dimensional Fuzzy controllers

Analysis of One and Two Dimensional Fuzzy Controllers

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IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： Xiaojun Ban X.Z. Gao Xianlin Huang T.B. Wu Department of Control Theory and Engineering Harbin Institute of Technology Harbin China Institute of Intelligent Power Electronics Helsinki University of Technology Espoo Finland

In our paper, the analytical structures and properties of the one and 2D fuzzy controllers are first investigated in details. The nature of these two kinds of fuzzy controllers is next probed from the viewpoint of control engineering. For the one dimensional fuzzy controller, it is concluded that this controller is a combination of a saturation element and a nonlinear proportional controller, and the system that employs the one dimensional fuzzy controller is the combination of an open-loop control system and a closed-loop control system. On the other hand, the 2D controller is a hybrid controller, which comprises the saturation part, zero-output part, nonlinear derivative part, nonlinear proportional part, as well as nonlinear proportional-derivative part, and the 2D fuzzy controller-based control system is a loop-varying system with varying number of control loops

关键词： Fuzzy control Proportional control Nonlinear control systems control systems Open loop systems Pi control PD control Three-term control control theory Paper technology

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Robust control design for stiffness measurement of flexible joint

Robust control design for stiffness measurement of flexible ...

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International Conference on Machine Learning and Cybernetics (ICMLC)

作者： Guang-Lin Wang Yun-Feng Li Yun-Li Wu Department of Mechanical Engineering and Automation Harbin Institute of Technology Harbin China Center for Control Theory and Guidance Technology Harbin Institute of Technology Harbin China

Flexible joint, one kind of force-sensing element, is a key part of flexible gyro. Its stiffness is very small such that it is easily disturbed by noises in working environment. During the development of the instrument of its stiffness measuring, instability is the main factor affecting the measuring precision. This paper firstly presents a model for stiffness measuring system subjected to disturbance. Based on the model, robust H/sub /spl infin// control design for stiffness measurement of flexible joint is proposed by using a complete parametric approach of eigenstructure assignment to stabilize the stiffness measuring system and guarantee the specified H/sub /spl infin//-norm upper-bound constraint. Finally, the results of simulation show the effect of the proposed approach.

关键词： Robust control control design Neck Instruments Riccati equations Force sensors Mechanical engineering Automation control theory Working environment noise

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Web-based MATHEMATICA platform for systems and control education

Web-based MATHEMATICA platform for systems and control educa...

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20th IEEE International Symposium on Intelligent control, ISIC '05 and the13th Mediterranean Conference on control and Automation, MED '05

作者： Kujan, Petr Hromčík, Martin Šebek, Michael Department of Control Engineering Faculty of Electrical Engineering Czech Technical University in Prague Karlovo nam. 13 12135 Prague 2 Czech Republic Centre for Applied Cybernetics Faculty of Electrical Engineering Czech Technical University in Prague Karlovo nam. 13 12135 Prague 2 Czech Republic Centre for Applied Cybernetics Institute of Information Theory and Automation Pod vodarenskou vezi 4 18208 Praha 8 Czech Republic Institute of Information Theory and Automation Pod vodarenskou vezi 4 18208 Praha 8 Czech Republic

ISBN: (纸本)0780389360

Computer algebra software tools in general, and the MATHEMATICA system in particular, are increasingly employed during the controls and systems graduate and undergraduate courses at FEE CTU in Prague. MATHEMATICA benefits from its high-level user interface, graphical abilities, as well as numerical and symbolic computational power and dedicated packages for control systems analysis and design (control Systems Professional and Advanced Numerical Methods). In addition, MATHEMATICA provides a web-based platform for publication of results and presenting user-callable routines (webMATHEMATICA). In the Czech Republic a project financed by the Ministry of Education and called PUMA (Power User Mathematic Array) has been started recently, focused on creation of webaccessible software tools to support education at technical universities. The authors have been involved in these efforts and would like to contribute by creating a web site based on webMATHEMATICA dedicated to numerical and symbolic computations for systems and controls. This paper is the first report on this topic. The work is in rapid progress now and the paper summarizes the authors' plans and first results. ©2005 IEEE.

关键词： Computer aided software engineering

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Analysis of different crystalliser configurations to perform preferential crystallisation

Analysis of different crystalliser configurations to perform...

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作者： Elsner, M.P. Muslera, E. Alonso Angelov, I. Fernaśndez Menéndez, D. Lorenz, H. Polenske, D. Vollmer, U. Raisch, J. Seidel-Morgenstern, A. Max Planck Institute for Dynamics of Complex Technical Systems Physical and Chemical Foundations of Process Engineering Sandtorstr. 1 39106 Magdeburg Germany Max Planck Institute for Dynamics of Complex Technical Systems Systems and Control Theory Group Sandtorstr. 1 39106 Magdeburg Germany Otto von Guericke University Department of Chemical Engineering Universitätsplatz 2 39106 Magdeburg Germany Otto von Guericke University Department of System Theory of Process Engineering PO Box 4120 39106 Magdeburg Germany

The intention of this paper is the analysis of general concepts for preferential crystallisation with the focus on aspects of quantification. In this preliminary examination, the amino acid threonine was used as a model system. The use of on-line polarimetry in combination with on-line densimetry as well as microscopic investigation enables to obtain some indispensable information about the crystallisation kinetics. Taking these estimated values into consideration a simplified mathematical description as a first approach including a population balance model was established for the simulation of the time changes of liquid phase composition during the preferential crystallisation process. Based on this simplified model different crystalliser configurations were investtigated.

关键词： Crystallization

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Femlab-based output regulation of nonhyperbolically nonminimum phase system and its real-time implementation

Femlab-based output regulation of nonhyperbolically nonminim...

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作者： Rehák, Branislav Orozco-Mora, Jorge Čelikovský, Sergej Ruiz-León, Javier Department of Control Engineering Faculty of Electrical Engineering Czech Technical University Technická 2 166 27 Praha 6 Czech Republic CINVESTAV-IPN Unidad Guadalajara Plaza la Luna 44550 Guadalajara Jalisco Mexico Institute of Information Theory and Automation Academy of Sciences of the Czech Republic P.O. Box 18 182 08 Prague Czech Republic

ISBN: (纸本)008045108X

The aim of this paper is twofold. It provides another option how to obtain a universal easily implementable method for the solution of the regulator equations using the FEMLAB package. The regulator equation originates from the output regulation problem. The main idea is making a slight change of the regulator equation. It is then solved using the finite-element method. Some theoretical aspects concerning solvability of the equations and convergence to the original problem are introduced. Secondly, to demonstrate viability of our approach, the results were applied to the real-time control of a gyroscope. Both simulations and real-time laboratory experiments are included. Copyright © 2005 IFAC.

关键词： Gyroscopes

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ON COMPUTING DETERMINANTS OF LARGE SYLVESTER TYPE MATRICES

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IFAC Proceedings Volumes 2005年第1期38卷 880-885页

作者： Petr Kujan Martin HromĈík Michael Ŝebek Department of Control Engineering Faculty of Electrical Engineering Czech Technical University in Prague Centre for Applied Cybernetics Faculty of Electrical Engineering Czech Technical University in Prague Karlovo nam. 13 12135 Prague 2 Czech Republic Centre for Applied Cybernetics Institute of Information Theory and Automation Institute of Information Theory and Automation Pod vodarenskou vezi 4 18208 Praha 8 Czech Republic

This work is devoted to computation of large n-D polynomial determinants with a special structure. Applications involve n-D systems theory (e.g. coprimeness test for two n-D polynomials or the theory of algebraic equations. More specifically, these determinants were exploited in (Chiasson et al. , 2003 b ; Chiasson et al. , 2003 a ) to solve the practical problem of multilevel converter by a special computational procedure. To tackle the concerned problem it is essential to solve a system of polynomial equations with many unknowns. An algorithm was chosen based on elimination theory using resultants leading to the fundamental problem of computing determinants of large Sylvester type matrices with n-D polynomial entries. The aim of this work is to propose and test new numerical algorithms that would make it possible to solve the concerned problems more effectively.

关键词： Polynomial methods Numerical methods Fast Fourier Transform

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The influence of feedback/feedforward control on relaxed pass profile controllability of discrete linear repetitive processes

The influence of feedback/feedforward control on relaxed pas...

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International Workshop on Multidimensional (nD) Systems

作者： L. Hladowski K. Galkowski E. Rogers A. Kummert D.H. Owens Institute of Control and Computation Engineering University of Zielona Gora Zielona Gora Poland University of Wuppertal Germany School of Electronics and Computer Science University of Southampton Southampton UK Faculty of Electrical Information and Media Engineering Communication Theory University of Wuppertal Germany Department of Automatic Control and Systems Engineering University of Sheffield Sheffield UK

Repetitive processes are a distinct class of 2D systems (i.e. information propagation in two independent directions) of both systems theoretic and applications interest. They cannot be controlled by direct extension of existing techniques from either standard (termed 1D here) or 2D systems theory. Here we give the first results on how feedback/feedforward control action can be used to influence one form of controllability for processes with discrete dynamics.

关键词： Linear feedback control systems controllability Integrated circuit modeling control engineering computing Vectors Communication system control Computer science Systems engineering and theory State-space methods Multidimensional systems

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