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IEEE Conference on Decision and control

作者： K.-E. Arzen A. Cervin J. Eker L. Sha Department of Automatic Control Lund Institute of Technology Sweden Department of Computer Science University of Illinois Urbana-Champaign USA

ISBN: (纸本)0780366387

The paper presents the emerging field of integrated control and CPU-time scheduling, where more general scheduling models and methods that better suit the needs of control systems are developed. This creates possibilities for dynamic and flexible integrated control and scheduling frameworks, where the control design methodology takes the availability of computing resources into account during design and allows online trade-offs between control performance and computing resource utilization.

关键词： Processor scheduling Centralized control Real time systems control system synthesis Availability Resource management control systems Kernel Operating systems Time factors

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On the poles of a class of 2D linear systems

On the poles of a class of 2D linear systems

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IEEE Conference on Decision and control

作者： E. Rogers J. Wood D.H. Owens Department of Electronics and Computer Science University of Southampton UK Department of Automatic Control and Systems Engineering University of Sheffield Sheffield UK

ISBN: (纸本)0780366387

Repetitive processes are a distinct class of 2D systems of both practical and theoretical interest. We use work in behavioral theory for nD linear systems to characterize poles for the case of so-called discrete linear repetitive processes. A unique feature is that the resulting poles lead to a physically based interpretation of stability for these processes.

关键词： Linear systems Asymptotic stability Polynomials computer science automatic control Systems engineering and theory Time measurement Sufficient conditions Kernel Frequency

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Iterative learning control-recent progress and open research problems

Iterative learning control-recent progress and open research...

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IEE Seminar Learning Systems for control (Ref. No. 2000/069)

作者： D.H. Owens E. Rogers Head of the Department of Automatic Control and Systems Engineering University of Sheffield UK Department of Electronics and Computer Science University of Southampton UK

The emergence of intelligent control has seen a focus of attention on the ideas of learning control. This paper introduces the current state of the art in the area of iterative learning control (ILC). Together with a general description of the problems that must be addressed, the paper explores the relationship between the performance of learning algorithms and the structure of the system to be controlled. The importance of system's relative degree (pole-zero excess) and the system's zeros are described and the role of prediction in improving performance is stated.

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Stability tests for a class of differential linear repetitive processes with dynamic boundary conditions

Stability tests for a class of differential linear repetitiv...

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IEEE Conference on Decision and control

作者： S.E. Benton E. Rogers D.H. Owens Department of Electronics and Computer Science University of Southampton Southampton UK Department of Automatic Control and Systems Engineering University of Sheffield Sheffield UK

ISBN: (纸本)0780366387

Repetitive processes are a distinct class of 2D systems of both practical and theoretical interest. Their essential characteristic is repeated sweeps, termed passes, through a set of dynamics defined over a finite duration with explicit interaction between the outputs, or pass profiles, produced as the process dynamics evolve. Experience has shown that these processes cannot be studied/controlled by direct application of existing theory. This fact, and the growing list of applications areas, has prompted an ongoing research programme into the development of a 'mature' systems theory for these processes for onward translation into reliable generally applicable controller design algorithms. This paper develops stability tests for a sub-class of so-called differential linear repetitive processes in the presence of a general set of initial conditions, where it is known that the structure of these conditions is critical to their stability properties.

关键词： Testing Stability analysis Stability criteria Boundary conditions computer science automatic control Systems engineering and theory Linear systems Delay Machining

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Fast algorithms for identification of rapidly fading channels

Fast algorithms for identification of rapidly fading channel...

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European Signal Processing Conference (EUSIPCO)

作者： Maciej Niedźwiecki Tomasz Kłaput Faculty of Electronics Telecommunications and Computer Science Department of Automatic Control Technical University of Gdańsk ul. Narutowicza 11/12 Gdańsk Poland

The problem of identification/tracking of rapidly fading communication channels is considered. When the channel coefficients vary rapidly with time the most frequently used weighted least squares (WLS) and least mean squares (LMS) algorithms are not capable of tracking the changes satisfactorily. To obtain good estimation results one has to use more specialized adaptive filters, such as the basis function (BF) algorithms which are based on explicit models of parameter changes. Unfortunately, estimators of this kind are numerically very demanding. The paper introduces a new class of recursive algorithms which combine low computational requirements, typical of WLS and LMS filters, with very good tracking capabilities, typical of BF filters.

关键词： Mean square error methods

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Fast recursive basis functions estimators for identification of time-varying processes

Fast recursive basis functions estimators for identification...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： M. Niedzwiecki T. Klaput Faculty of Electronics Telecommunications and Computer Science Department of Automatic Control Technical University of Gdańsk Gdansk Poland Politechnika Gdanska Gdansk WojewÃ³dztwo pomorskie PL

When system parameters vary rapidly with time the weighted least squares filters are not capable of following the changes satisfactorily-some more elaborate estimation schemes, based on the method of basis functions, have to be used instead. The basis functions estimators have increased tracking capabilities but are computationally very demanding. The paper introduces a new class of adaptive filters, based on the concept of postfiltering, which have improved parameter tracking capabilities, typical of the basis functions algorithms, but, at the same time, have pretty low computational requirements, typical of the weighted least squares algorithms.

关键词： Recursive estimation Least squares approximation Least squares methods Finite impulse response filter Time varying systems computer science Adaptive filters Noise measurement White noise History

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Strong practical stability for a class of 2D linear systems

Strong practical stability for a class of 2D linear systems

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： K. Galkowski E. Rogers A. Gramacki J. Gramacki D. Owens Institute of Robotics and Software Engineering Technical University of Zielona Gora Poland Department of Electronics and Computer Science University of Southampton Southampton UK Institute of Computer Science and Electronics Technical University of Zielona Gora Poland Department of Automatic Control and Systems Engineering University of Sheffield UK

Linear repetitive processes are a distinct class of 2D linear systems of both theoretical and practical interest. The stability theory for these processes currently consists of two distinct concepts termed asymptotic stability and stability along the pass respectively where the former is a necessary condition for the latter. Recently applications have arisen where asymptotic stability is too weak and stability along the pass is too strong for meaningful progress to be made. This paper develops the concept of strong practical stability for such cases.

关键词： Linear systems Asymptotic stability computer science State-space methods Robotics and automation Software engineering Systems engineering and theory Metals industry Iterative algorithms Electrical equipment industry

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An effective uniform genetic algorithm for hard optimization problems

An effective uniform genetic algorithm for hard optimization...

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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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On-line Reconfiguration of Real-Time Robot Motion and Force control

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IFAC Proceedings Volumes 2000年第27期33卷 171-176页

作者： A. Robertsson A. Valera K. Nilsson R. Johansson Dept. of Automatic Control Lund University SE-22100 Lund Sweden Dept. of Systems Engineering & Automation Valencia Technical University ES-46022 Valencia Spain Dept of Computer Science Lund Institute of Technology Lund University SE-22100 Lund Sweden

Combining position and force control is highly desirable in many robot applications. Many years of extensive research has resulted in a number of promising control approaches, but often too much engineering effort is required in order to evaluate a low level (high performance) control scheme on a real manipulator. The new control system we have obtained has two main advantages: first it provides a total open control architecture, and second it is the simplicity and the interactivity of the platform developed. Using this new control architecture, any force and motion control strategy can be programmed and implemented in a graphical and easy way.

关键词： Robot control Force control Embedded systems Rapid prototyping Non-linear control

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Chaotification of continuous-time systems via time-delay feedback

Chaotification of continuous-time systems via time-delay fee...

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International Conference on control of Oscillations and Chaos

作者： Xiao Fan Wang Guanrong Chen Xinghuo Yu Department of Automatic Control Nanjing University of Science and Technology of PLA Nanjing China Department of Electrical and Computer Engineering University of Houston Houston TX USA Department of Information and Communication Central Queensland University Rockhampton QLD Australia

ISBN: (纸本)0780364341

In this paper, a systematic design approach based on time-delay feedback is developed for chaotification of a continuous-time, feedback linearizable system. The chaotification is accomplished based on nonlinear control theory and an approximate relationship between a time-delay differential equation and a discrete map. An example is given to illustrate the systematic design procedure.

关键词： Chaos Chaotic communication Differential equations control systems control theory State feedback Delay Difference equations Ear Feedback control

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