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Lecture Notes in control and Information Sciences 2005年 312卷 273-292页

作者： Prajna, Stephen Papachristodoulou, Antonis Seiler, Peter Parrilo, Pablo A. Control and Dynamical Systems California Institute of Technology Pasadena CA 91125 United States Mechanical and Industrial Engineering Dept. University of Illinois at Urbana-Champaign Urbana IL 61801 United States Automatic Control Laboratory Swiss Federal Institute of Technology CH-8092 Zürich Switzerland

In this chapter we present SOSTOOLS, a third-party MATLAB toolbox for formulating and solving sum of squares optimization problems. Sum of squares optimization forms a basis for formulating convex relaxations to computationally hard problems such as some that appear in systems and control. Currently, sum of squares programs are solved by casting them as semidefinite programs, which can in turn be solved using interior-point based numerical methods. SOSTOOLS helps this translation in such a way that the underlying computations are abstracted from the user. Here we give a brief description of the toolbox, its features and capabilities (with emphasis on the recently added ones), as well as show how it can be applied to solving problems of interest in systems and control. © Springer-Verlag Berlin Heidelberg 2005.

关键词： MATLAB

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Modelling of peroxide-bleaching of pulp using Gaussian processes

Modelling of peroxide-bleaching of pulp using Gaussian proce...

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作者： Lenz, Henning Horn, Joachim Runkler, Thomas Dinkel, Markus Schmidt, Thomas Sieber, Albrecht Mickal, Volkmar Department Information and Communications Siemens AG Corporate Technology Otto-Hahn-Ring 6 81730 Munich Germany Dept. of El. Eng. Helmut-Schmidt-University of Federal Armed Forces Inst. of Automatic Control Holstenhofweg 85 22043 Hamburg Germany Department of Technology Gebr. Lang GmbH Papierfabrik Fabrikstrabe 4 86833 Ettringen Germany Industrial Plants Pulp and Paper Technologies Siemens AG Schuhstrabe 60 91052 Erlangen Germany

ISBN: (纸本)008045108X

Recycling of paper is typically performed in a chain of processes. an important process is the peroxide bleaching implementing the means to achieve a high brightness quality. As this process step requires consumption of various chemicals, it is quite cost intensive. This paper presents means to optimize the bleaching stage to achieve an (adaptable) trade-off between cost and brightness: First, the time-varying deadtime of the bleaching stage is estimated using a Kalman filter. Second, the bleaching stage is modelled by Gaussian processes aiming to be used for optimization of the bleaching stage by application of a model predictive controller. Copyright © 2005 IFAC.

关键词： Bleaching

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The effect of variation resistance broken bars in induction motor using stator current signature analysis

Modelling, Measurement and Control A

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Modelling, Measurement and control A 2005年第3-4期78卷 33-46页

作者： Menacer, A. Said, M. S. Nait Benakcha, A.H. Moreau, S. Drid, S. Biskra Electronic Engineering Laboratory Electrotechnics Dept. Biskra University B.P. 145 Biskra 07000 Algeria Electromagnetic Propulsion-Induction Laboratory Electrical Engineering Dept. Batna University 05000 Batna Algeria Industrial Informatics and Automatic Control Laboratory ESIP 40 Recteur Pineau Avenue 86022 Poitiers Cedex France

In all mechanical devices, motors are subject to failures, which can sometimes lead to the shutting down of an entire industrial process. That is the reason why predictive maintenance and prognosis are necessary. Motor current signature analysis is a condition monitoring technique that is now widely used to diagnose problems such as broken rotor bars, abnormal levels of airgap eccentricity, shorted turns in low voltage stator windings and some mechanical problems. This paper presents the effect of the broken bar time evolution since the created incipient fault on the various characteristics of the induction machine such as torque, speed and currents. The methods used for analysis are based on: the Lissajous representation of Park vector current components spectral analysis of stator current and the modulus of Park vector current.

关键词： Induction motors

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MODELLING OF PEROXIDE-BLEACHING OF PULP USING GAUSSIAN PROCESSES

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IFAC Proceedings Volumes 2005年第1期38卷 489-494页

作者： Henning Lenz Joachim Horn Thomas Runkler Markus Dinkel Thomas Schmidt Albrecht Sieber Volkmar Mickal Siemens AG Corporate Technology Department Information and Communications Otto-Hahn-Ring 6 81730 Munich Germany Helmut-Schmidt-University of the Federal Armed Forces Dept. of El. Eng. Inst. of Automatic Control Holstenhofweg 85 22043 Hamburg Germany Gebr. Lang GmbH Papierfabrik Department of Technology Fabrikstraße 4 86833 Ettringen Germany Siemens AG Industrial Solutions and Services Industrial Plants Pulp & Paper Technologies Schuhstraße 60 91052 Erlangen Germany

Recycling of paper is typically performed in a chain of processes. An important process is the peroxide bleaching implementing the means to achieve a high brightness quality. As this process step requires consumption of various chemicals, it is quite cost intensive. This paper presents means to optimize the bleaching stage to achieve an (adaptable) trade-off between cost and brightness: First, the time-varying deadtime of the bleaching stage is estimated using a Kalman filter. Second, the bleaching stage is modelled by Gaussian processes aiming to be used for optimization of the bleaching stage by application of a model predictive controller.

关键词： Paper Industry Process Models Nonlinear Models Gaussian Processes Optimization Quadratic Programming

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Research on the DRNN-based inverse control for a servo system

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Xi Tong Gong Cheng Yu Dian Zi Ji Shu/Systems engineering and Electronics 2005年第8期27卷 1456-1458页

作者： Wang, Wei-Hong Yu, Lei Yao, Guang Dept. of Automatic Control Beijing Univ. of Aeronautics and Astronautics Beijing 100083 China Automation Inst. Qingdao Univ. of Science and Technology Qingdao 266053 China

To resolve the influence of uncertainty and nonlinearity on the high-precision turntable servo system, an inverse control method based on diagonal recurrent neural network (DRNN) is presented. The inverse controller is composed of two DRNNs, the DRNNI is used to identify the system inverse model on line, the copy of the DRNNI is used as the controller (DRNNC). The proposed controller combines the advantages of neural network and inverse system control, and can compensate the influence of uncertainty and nonlinearity. The simulation result on the servo system indicates that the control method above improves effectively dynamic tracking performance of the servo system and has good robustness. The calculation time of the controller is reduced, thus, the requirement of real-time control is better satisfied.

关键词： Diagonal recurrent neural network Inverse control Robustness Servo system Tracking control Turntable

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Stability analysis and H∞ synthesis for linear systems with time-varying delays

Stability analysis and H∞ synthesis for linear systems with...

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Proceedings of the 2004 American control Conference (AAC)

作者： Xue, Anke Cao, Yong-Yan Pi, Daoying Dept. of Automation Hangzhou Inst. of Electron. Eng. Hangzhou 310037 China Dept. of Electrical Engineering University of Virginia Charlottesville VA 22903 Dept. of Control Zhejiang University Hangzhou 310027 China

ISBN: (纸本)0780383354

This paper is devoted to stability analysis and synthesis of the linear systems with time-varying delays. Some new stability conditions are developed for the systems based on Lyapunov-Razumikhin theorem. Then a design method for the general state feedback controllers is proposed for the systems with multiple delays by the LMI optimization based approach. Numerical examples are used to demonstrate the effectiveness of the proposed design technique.

关键词： Linear systems

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SOSTOOLS: control applications and new developments

SOSTOOLS: Control applications and new developments

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2004 IEEE International Symposium on Computer Aided control System Design

The developments and control applications of SOSTOOLS, a free third-party MATLAB toolbox for formulating and solving sum of squares programs was discussed. The technique was based on the sum of squares decomposition for multivariate polynomials which can be effectively computed using semidefinite programming. The nonlinear stability analysis, parametric robustness analysis, safety verification, and nonlinear controller synthesis was also considered in the control applications. A sparsity structure was used while considering infinitely constrained linear matrix inequalities (LMI).

关键词： control theory

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The application of directional wavelets in multiscale representation of pulp fibre image

The application of directional wavelets in multiscale repres...

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Proceedings of 2004 International Conference on Machine Learning and Cybernetics

作者： Hou, Bei-Ping Zhu, Wen Natl. Lab. Indust. Contr. Technol. Inst. of Industrial Process Control Zhejiang University Hangzhou 310027 China Dept. of Information Engineering Zhejiang Univ. of Sci. and Technol. Hangzhou 310023 China

ISBN: (纸本)0780384032

This paper proposes a novel algorithm to decompose fibre image and extract its edge characteristics. Because the characteristics of the paper fibre such as length and width play an important role in papermaking industry, so how to measure its related characteristics is important to improve the paper quality and production. An online fibre analyzer is designed based on the computer vision theory, and the distribution structure of the online fibers on image presents the multi-directional properties, so the multi-direction and multi-scale algorithm is proposed, and the directional wavelet transform is applied to the analysis of fibre image. Our analysis shows that directional wavelet transform can better reflect the edge information of images, because direction and texture information of fibre image can be better expressed. The experiment proves that the directional characterizations of fibre image can be extracted effectively.

关键词： Image processing

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Optimizing the structure of hierarchical mixture of experts using genetic algorithms

Optimizing the structure of hierarchical mixture of experts ...

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2004 2nd International IEEE Conference 'Intelligent Systems' - Proceedings

作者： Karras, Dimitrios A. Vlitakis, Constantinos E. Boutalis, Yiannis S. Mertzios, Basil G. Chalkis Institute of Technology Dept. Automation Hellenic Open University Rodou 2 Ano Iliupolis Athens 16342 Greece Democritus University of Thrace Dept. Electrical Engineering 67100 Xanthi Greece Department of Automation Thessaloniki Inst. Technol. Thessaloniki Hellas Democritus University Lab. of Automatic Control System Xanthi Hellas

ISBN: (纸本)0780382781

This study is an effort to give a practical solution in the problem of optimizing the structure of the Hierarchical Mixture of Experts model, which is a natural extension of the Associative Gaussian Mixture of Experts system. We present two novel methods for optimizing such structures using Genetic Algorithms. Special concern is taken for reducing the computational time so as to efficiently allow the structure to "grow" while it evolves with the Genetic Algorithm. The main contribution of the paper lies on the efficient, topologically oriented, representations of such architectures so as to be optimized through involving genetic algorithms.

关键词： Expert systems

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Fast prototype simulation system based on Matlab

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Xitong Fangzhen Xuebao / Journal of System Simulation 2004年第12期16卷 2741-2742+2746页

作者： Su, Kui-Feng Su, Yong-Zhi Lu, Qiang Geng, Qing-Feng Dept. of Control Eng. Armored Army Engineer Inst. Beijing 100072 China Dept. of Experiment Engineering Inst. of Command and Tech. of Equip. Beijing 101416 China

The fast prototype is most basically used to design system project and test hardware quickly and easily. It can avoid many weakness of the literal criterion and improve the item's inheritable character and continuity because it adopts the frame diagram construction which is easily understood to describe the whole system. In particular, it is introduced primarily the realization of the collection and process of digital signal based on software Matlab and digital signal processor C6000. In addition, automatic code generator is applied to combine software Matlab with C6000 and it realizes the connection between high-level arithmetic and applied hardware of digital signal process which provides a favorable means to prophase development and arithmetic validity of the item.

关键词： DSP Fast prototype Hardware in loop Matlab Voice processing

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