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Initial Design of a Virtual Machine to Play Grafcet Models

IFAC Proceedings Volumes 2000年第17期33卷 41-46页

作者： Xoán C. Pardo Martínez Ramón Ferreiro García Systems Engineering & Automatic Control Group Electronics & Systems Department. University of A Coruña E.S. Marina Civil Paseo de Ronda 5. 15011 A Coruila

This paper introduces the architecture of a virtual machine designed to play Grafcet models. The architecture proposed is highly flexible and can be used to implement different types of Grafcet players. In addition, many of the variable aspects considered when playing a Grafcet can be completely redefined, even changed dynamically. An object-oriented static meta-model for the Grafcet language is also introduced.

关键词： design patterns discrete event dynamic systems (DEDS) Grafcet object oriented meta-model unified modeling language (UML) virtual machine (VM)

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Congress on Evolutionary Computation

作者： C. Dimopoulos N. Mort Dept. of Autom. Control & Syst. Eng. Sheffield Univ. UK Department of Automatic Control Systems Engineering University of Sheffield Sheffield UK

The cell formation problem is a classic manufacturing optimisation problem associated with the implementation of a cellular manufacturing system. A variety of hierarchical clustering procedures have been proposed for the solution of this problem. Essential for the operation of a clustering procedure is the determination of a form of similarity between the objects that are going to be grouped. The authors employ a genetic programming algorithm for the evolution of new similarity coefficients for the solution of simple cell formation problems. Evolved coefficients are tested against the well-known Jaccard's similarity coefficient on a large number of problems taken from the literature.

关键词： Cellular manufacturing group technology systems engineering and theory Genetic programming Manufacturing systems Manufacturing automation Clustering algorithms System testing Costs Modems

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Friendly interface for objects selection in a robotized kitchen

Friendly interface for objects selection in a robotized kitc...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： A. Casals X. Cufi J. Freixenet J. Marti X. Munoz Department of Automatic Control and Computer Engineering Polytechnic University of Catalonia Catalonia Spain Computer Vision and Robotics Group EIA-IIiA University of Girona Catalonia Spain

This paper presents an interface for the interaction between a human and an adapted kitchen where different elements, including a robot, have to be controlled. After the global structure of the interface is described a more detailed explanation is presented on the way the interface offers the user an easy and friendly way to select the desired objects and to provide their position to the robot for their manipulation.

关键词： Robotics and automation Robot vision systems Computer vision control engineering computing Human robot interaction automatic control Research and development Ergonomics Cameras Layout

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A comparison of different methods to assess phase-locking in auditory neurons

A comparison of different methods to assess phase-locking in...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： U. Moissl U. Meyer-Base Institute of Automatic Control Darmstadt University of Technology Darmstadt Germany Department E. & C. Engineering DSP Group University of Florida Gainesville FL USA

Proposes a method to reconstruct acoustic signals from auditory nerve firings. This is a major step in order to improve cochlear implants by demonstrating what patients perceive with such a device. A computer model of the human cochlea transforms an acoustic test signal into a train of impulses, and the place- and volley-principle of cochlear frequency coding will be evaluated in order to invert this process, i.e. to reconstruct the original signal from the impulses. Phase-locking of the impulses to an acoustic stimulus is believed to be the main information carrier of loudness and frequency in the cochlea. Four different synchronization indices, which are used to assess phase-locking in the sensory receptor cells of the ear, will be presented and compared.

关键词： Neurons Ear Frequency Hair Acoustic devices Cochlear implants Biomembranes Humans Resonance Fires

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Application of a genetic algorithm in triangulation of a 3-D object surface

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International Journal of Computers and Applications 2000年第2期22卷 73-77页

作者： Zhenyu, Chen Mbede, J.B. Yan, Zhou Dehua, Li Hanping, Hu State Commn. Res. Open Lab. Image P. Inst. Pattern Recog. Artif. Intell. Huazhong Univ. of Sci. and Technol. 430074 Wuhan China Intelligent Contr. and Robotics Lab. Dept. of Contr. Sci. and Engineering Huazhong Univ. of Sci. and Technol. 430074 Wuhan China Second Artillery Institute Huazhong Univ. of Sci. and Technol. Inst. Pattern Recog. Artif. Intell. Huazhong Univ. of Sci. and Technol. Second Artillery Institute China Wuhan University China Artificial Intelligence Department University of Edinburgh Inst. of AI and Pattern Recognition Huazhong Univ. of Sci. and Technol. China Cogn. Sci. Natl. Key Found. Res. P. Douala University Cameroon Tübingen University Germany Automatic Control Laboratory Darmstadt University Department of Service Cameroon Min. of National Education Robotics Laboratory Huazhong Univ. of Sci. and Technol. Wuhan China Assoc. Connectionnistes These-ACTH Rennes France IEEE Soc. of Robotics and Automation IEEE Society of Control Systems IASTED Assoc. Jeunes Chercheurs Robotique France Navy University of Engineering China Huazhong Univ. of Sci. and Technol. China Department of Computer Science Airforce Radar Acad. of Engineering China Inst. of P.R and AI Huazhong Univ. of Sci. and Technol.

This paper proposes a genetic-based algorithm for surface reconstruction of three-dimension (3-D) objects from a group of contours representing its section plane lines. The algorithm can optimize the triangulation of the surface of 3-D objects with a multi-objective optimization function to meet the needs of a wide range of applications. Further, a new crossover operator for triangulation and a new 3-D quadrilateral mutation operator are also introduced.

关键词： Object recognition

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Correlation methods of continuous-time state-space model identification

Correlation methods of continuous-time state-space model ide...

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1999 European control Conference, ECC 1999

作者： Johansson, Rolf Verhaegen, Michel Haverkamp, Bert R. J. Chou, Chun Tung Department of Automatic Control Lund Institute of Technology Lund University PO Box 118 LundS-221 00 Sweden Department of Electrical Engineering System and Control Engineering Group TU Delft GA DelftNL-2600 Netherlands

This paper presents theory, algorithms and validation results for system identification of continuous-time state-space models from finite input-output sequences. The algorithms developed are methods of subspace model ... 详细信息

ISBN: (纸本)9783952417355

关键词： Correlation methods

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Modelling the enamelled wire manufacturing process to improve on-line quality control

Modelling the enamelled wire manufacturing process to improv...

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American control Conference (ACC)

作者： N. Mort L.W. Bridges Department of Automatic Control & Systems Engineering University of Sheffield Sheffield UK

This paper examines the potential for using empirical models derived from real plant data for online quality control for an enamelled wire production process. Existing procedures are based around a well-established offline technique known as Tangent Delta. Using data recorded from normal production operations, models representing parameter input/output relationships are fast developed using standard linear regression. The linear models do not capture the behaviour of the process sufficiently well so other methods based on nonlinear and fuzzy methods and artificial neural networks are developed. The ability of each of these methods to capture the process characteristics are compared using test set data. The results indicate that the nonlinear models derived using the group method of data handling (GMDH) approach offer considerable promise for online quality control in this industrial application.

关键词： Wire Manufacturing processes Quality control Production Standards development Linear regression Fuzzy neural networks Artificial neural networks Testing Data handling

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Maximum likelihood estimation of models with unstable dynamics and nonminimum phase noise zeros

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IFAC Proceedings Volumes 1999年第2期32卷 3784-3789页

作者： Urban Forssell Håkan Hjalmarsson Division of Automatic Control Department of Electrical Engineering Linköping University S-581 83 Linköping Sweden Signal Processing Group Department of Signals Sensors and Systems Royal Institute of Technology S-100 44 Stockholm Sweden

Maximum likelihood estimation of single-input single-output linear time-invariant dynamic models requires that the model innovation (the nonmeasurable white noise source that is assumed to be the source of the randomness of the system) can be computed from the observed data. For many model structures, the prediction error and the model innovation coincide and the prediction error can be used in maximum likelihood estimation. However, when the model dynamics and the noise model have unstable poles which are not shared or when the noise dynamics have unstable zeros this is not the case. One such example is an unstable output error model. In this contribution we show that in this situation the model innovation can be computed by noncausal filtering. Different implementations of the model innovation filter are also studied.

关键词： Identification Output error identification Prediction error methods Maximum likelihood estimators Innovation Spectral factorization

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Robust H ∞ observers for uncertain time-delay systems: (II) the discrete-time case

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IFAC Proceedings Volumes 1999年第2期32卷 3432-3437页

作者： Zidong Wang Biao Huang H. Unbehauen Systems and Control Group Department of Mathematics University of Kaiserslautern P.O. Box 3049 D-67653 Kaiserslautern Fax: ++49/631 205 3052 Germany Department of Chemical and Materials Engineering University of Alberta Edmonton Alberta T6G 2G6 Canada Automatic Control Laboratory Faculty of Electrical Engineering Ruhr-University Bochum D-44780 Bochum Germany

In this note we consider the problem of H ∞ observer design for a class of uncertain linear discrete-time systems with delayed state and parameter uncertainties. The goal of this problem is to design a linear state observer such that, for the positive integer state time-delay and all admissible norm-bounded parameter uncertainties, the observation process remains robustly stable and the transfer function from exogenous disturbances to error state outputs meets the prespecified H ∞ norm upper bound constraint. The observer structure does not depend on the parameter uncertainties. A simple, effective algebraic methodology is developed to derive the conditions for the existence of the desired robust H ∞ observers, and the analytical expression of these observers is then characterized in terms of the matrix Riccati-like equations/inequalities. We provide a numerical example to demonstrate the validity and the applicability of the proposed approach.

关键词： Linear systems Uncertainty Time-delay Observers H-infinity control Robust stability

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Robust H ∞ observers for uncertain time-delay systems: (I) the continuous-time case

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IFAC Proceedings Volumes 1999年第2期32卷 3426-3431页

作者： Zidong Wang Biao Huang H. Unbehauen Systems and Control Group Department of Mathematics University of Kaiserslautem P.O. Box 3049 D-67653 Kaiserslautern Fax: ++49/631 205 3052 Germany Department of Chemical and Materials Engineering University of Alberta Edmonton Alberta T6G 2G6 Canada Automatic Control Laboratory Faculty of Electrical Engineering Ruhr-University Bochum D-44780 Bochum Germany

This note deals with the problem of H ∞ observer design for a class of uncertain linear systems with delayed state and parameter uncertainties. This problem aims at designing the linear state observers such that, for all admissible parameter uncertainties, the observation process remains robustly stable and the transfer function from exogenous disturbances to error state outputs meets the prespecified H ∞ on norm upper bound constraint, independently of the time-delay. The time-delay is assumed to be small but unknown, and the parameter uncertainties are allowed to be norm-bounded and appear in all the matrices of the state-space model. An effective matrix inequality methodology is developed to solve the proposed problem. We derive the conditions for the existence of the desired robust H ∞ observers, and then characterize the analytical expression of these observers. A numerical example demonstrates the validity and applicability of the present approach.

关键词： Linear systems Uncertainty Time-delay Observers H-infinity control Robust stability

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