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2005 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2005

作者： Kim, Jeong Woo Hwang, Jong-Sun Lee, Seon-Ho Min, Kyung Duck Kim, Hyung Rae Dept. of Geoinformation Engineering Sejong University Korea Republic of Dept. of Earth System Sciences Yonsei University Korea Republic of Satellite Control System Department Korea Aerospace Research Institute Korea Republic of Goddard Space Flight Center NASA Greenbelt MD United States

ISBN: (纸本)0780390504

We estimated the geomagnetic field from KOMPSAT-1 Three-Axis Magnetometer (TAM) measurements that control the attitude. Initial processing involved transforming the TAM's telemetry data from Earth-Centered Inertial Frame to Earth-Centered Earth-Fixed Frame and then to spherical coordinates. The magnetic field of the satellite body produces symmetric signature in the ascending and descending data sets and thus can be readily removed. To further eliminate the induced external fields and noise related to solar activity, spectral correlation filtering was applied for extracting these dynamic components. The ascending and descending data were then spectrally reconstructed to estimate the total magnetic field with minimum track-line noise. The KOMPSAT-1 field correlates with the Ørsted and IGRF2000 models at coefficients of 0.97 and 0.96, respectively. The spherical harmonic coefficients were then calculated from the KOMPSAT-1 model to degree and order of 19 by conjugate gradient inversion method. The KOMPSAT-1's coefficients are strongly coherent with the Ørsted, CHAMP, and IGRF2000 coefficients through degree 7. © 2005 IEEE.

关键词： Magnetometers

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Snubberless switching-off characteristics of IGCTs equipped in high power three-level neutral point clamped converters

Snubberless switching-off characteristics of IGCTs equipped ...

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International Conference on Electrical Machines and systems (ICEMS)

作者： Liqiang Yuan Zhengming Zhao Haitao Zhang Zhi Yang Bing Li Jianzheng Liu Department of Electrical Engineering Tsinghua University Beijing China Department of Frequency-Converter and Control System Guodian Nanjing Automation Company Limited Nanjing China

Along with the improved design and broad applications of multi-level topologies, as a new commercial power switch device in recent years, IGCT has led the rapid development of high power converters in many applications, such as medium voltage adjustable speed drive and FACTs. Since the power electronic device is the base of these converters, the switching-off characteristics of IGCTs have become one of the key points in converters' design and analysis, especially when snubber circuits are absent. This paper focuses on the snubberless switching-off characteristics of IGCTs equipped in the high power three-level neutral point clamped (NPC) converter. According to the physical characteristics of switch devices and commutating mechanism between different switching processes in the converter, the switching-off characteristics of IGCTs in different topology positions under different switching conditions are described, simulated and tested. The results of simulation and experiments are compared, especially the voltage spikes by IGCTs' switching off. The relation between the switching-off characteristics and the other elements of the converter is also discussed in detail, such as topology position, PWM strategy and mechanical structure. Finally, some helpful conclusions for high power converters' design and analysis are drawn

关键词： Switching converters Circuit topology Switches Medium voltage Variable speed drives Power electronics Switching circuits Snubbers Testing Pulse width modulation

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Dynamic system control of Gas Jet Flames Distribution by Predictive control Method

Dynamic System Control of Gas Jet Flames Distribution by Pre...

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IEEE International Symposium on Intelligent control (ISIC)

作者： Xubin Sun Hong Wang Institute of Automation Chinese Academy and Sciences Beijing China Control System Centre School of Electrical and Electronics Engineering University of Manchester Institute of Science and Technology Manchester UK

ISBN: (纸本)0780389379

This paper presents a predictive control method to the output probability density function (PDF) control for a dynamic flame system. The system consists of a static temperature model of gas jet flames and a second order actuator which leads the closed loop system to be a second order dynamic one. At first, the temperature distribution of the flame along the cross section is approximated. Then the flame energy distribution (FED) is obtained as the output to be controlled as approximated by a B-spline expansion. A singular state space model is used to describe the dynamic system with the weights of the B-spline functions as the state variables. Finally, a predictive control algorithm is designed for such an output PDF system. A case study has been included in this paper on the closed loop control of the combustion flames distribution systems

关键词： control systems Fires Predictive control Spline Probability density function Actuators Closed loop systems Temperature distribution State-space methods Prediction algorithms

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Analog baseband filtering realized using switched capacitor finite impulse response filter

Analog baseband filtering realized using switched capacitor ...

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International Symposium on VLSI Design, automation and Test

作者： A. Dabrowski R. Dlugosz P. Pawtowski K. Iniewski V. Gaudet Institute of Control and System Engineering Poznan University of Technology Poznan Poland Department of Electrical and Computer Engineering University of Alberta Edmonton Alberta Canada

Design of analog baseband filtering topology for application in multiple standard wireless systems has been evaluated. Two versions of GSM channel filter implemented as finite impulse response (FIR) discrete time filter in switched capacitor (SC) technique are presented. The GSM baseband channel filters have been realized in CMOS 0.8/spl mu/m and subsequently re-designed in 0.35/spl mu/m process for GSM/WCDMA application.

关键词： Finite impulse response filter Baseband Filtering Capacitors Operational amplifiers Topology GSM Digital filters Multiaccess communication Design engineering

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Applying the SEEP method in the design of a real-time embedded control system for a motorized wheelchair

Applying the SEEP method in the design of a real-time embedd...

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International Conference on Emerging Technologies and Factory automation (ETFA)

作者： M.A. Wehrmeister L.B. Becker C.E. Pereira Computer Science Institute UFRGS Brazil Automation and Control Systems Department UFSC Brazil Electrical Engineering Department UFRGS Brazil

This paper presents the object-oriented platform-based design process for embedded real-time systems (SEEP). More specifically, it includes a case study to highlight the main design steps proposed by SEEP. Details regarding embedded system modeling and its transition to the programming level are presented. Moreover, it describes the embedded system generation and provides data obtained from the hardware synthesis and the application execution. Moreover, it discusses how projects can be optimized according to requirements priorities. It finishes by highlighting the main advantage of SEEP in comparison to other existing methodologies for embedded systems design

关键词： Design methodology Real time systems control systems Wheelchairs Embedded system Hardware Embedded software Object oriented modeling Application software Process design

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Fuzzy temperature controller based on PMV

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Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) 2005年第SUPPL.期36卷 630-635页

作者： Duan, Chen-Xu Li, Jian-Xin Li, Hui Sun, Hao Duan, Pei-Yong Department of Information and Electrical Engineering Shandong University of Architecture and Engineering Ji'nan 250014 China Automation Institute Shandong Academy of Sciences Ji'nan 250014 China Department of Air-Conditioning Engineering Shandong University of Architecture and Engineering Ji'nan 250014 China College of Control and Information Shandong University Ji'nan 250061 China

A method was provided to control the temperature of the room by setting a parameter of PMV (Predicted mean vote). PMV presents as a setting value by controller, while feedback value was calculated through PMV model based on temperature and humidity measured directly. The comparison between setting and model calculated value of PMV gives rise to a PMV error signal which after calculated by Fuzzy controller can control the PMV through controlling the temperature of the room. This method, compared with the traditional method of temperature control based on temperature setting, takes into account the influence of humidity parameter on the PMV, so it can raise or lower the temperature of the room properly according to different seasons, on the premise of assuring the PMV, to achieve the aim of saving energy sources.

关键词： Energy savement Fuzzy control Predicted mean vote Temperature control

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ON THE EQUIVALENCE OF A MINIMAL ORDER MPC AND A GTDOF control OF TIME-DELAY PLANTS

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IFAC Proceedings Volumes 2005年第1期38卷 183-188页

作者： L. Keviczky Cs. Bányász Computer and Automation Research Institute of the H. Ac. of Sc. Control Engineering Research Group of the H. Ac. of Sc. at the Department of Automation and Informatics TU of Budapest

It is shown that for open-loop stable plants the task of an MPC can be solved by identifying the plant model only instead of the redundant prediction model. Interesting structural considerations can be derived from comparison of the topologies and structural forms of regulators obtained by pole-placement design, the GTDOF scheme and the MPC . A new simple method is also introduced for adaptive and combined iterative identification and control for time-delay plants.

关键词： time-delay pole-placement model predictive control two-degree of freedom regulator

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Novel contour extraction algorithm for a moving target based on image fusion

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Guangdianzi Jiguang/Journal of Optoelectronics Laser 2005年第8期16卷 973-977页

作者： Zhao, Peng Cao, Jun Pu, Zhao-Bang Zhang, Tian-Wen Department of Automation Measurement and Control Harbin Institute of Technology Harbin 150001 China Mechanic and Electronic Institute Northeast Forestry University Harbin 150040 China Department of Computer Science and Engineering Harbin Institute of Technology Harbin 150001 China

A contour extraction algorithm for a moving target is proposed. This algorithm consists of three steps. Firstly, motion segmentation is applied respectively to infrared and visible image sequences to get an initial contour of a moving target. Secondly, a dynamic contour is applied to make the initial contour converge to the target's contour. Finally, two novel image fusions are applied. The first fusion minimizes L2 norm's square of the difference of control point vectors in two modal images without image registration. The second fusion is realized by the modified differential coupling with image registration. Contrasting detection experiments indicate the second fusion is better. Meanwhile, a fast iteration algorithm of dynamic contour based on the Newmark method is devised. A contrasting experiment indicates its iteration time for stable convergence decreases by 21.01% compared with the Wilson-θ method.

关键词： Object recognition

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Survey of explicit approaches to constrained optimal control

Survey of explicit approaches to constrained optimal control

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European Summer School on Multi-Agent control

作者： Grancharova, Alexandra Johansen, Tor Arne Department of Engineering Cybernetics Norwegian University of Science and Technology N-7491 Trondheim Norway Institute of Control and System Research Bulgarian Academy of Sciences Acad. G. Bonchev str. B1.2 Sofia 1113 Bulgaria

This chapter presents a review of the explicit approaches to optimal control. It is organized as follows. Section 1 gives a summary of the main results of the optimal control theory. Section 2 presents briefly the methods for unconstrained optimal state feedback control of linear systems. Sections 3, 4 and 5 consider in details the explicit methods for constrained linear quadratic regulation (LQR) together with several examples. The main motivation behind the explicit solution is that it avoids the need for real-time optimization, and thus allows implementation at high sampling frequencies in real-time systems with high reliability and low software complexity. These sections include formulation of the constrained LQR problem, summary of the implicit approaches, basics of the model predictive control (MPC), description of the exact and the approximate approaches to explicit solution of MPC problems and the experimental evaluation of explicit MPC controller performance for laboratory gas-liquid separation plant. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Optimal control systems

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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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