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International Conference on Electrical Machines and Systems (ICEMS)

作者： Seung-Kil Choi Jae-Hak Shim Kwang-Cheol Ko Cheon Lee Hyung-Boo Kang Department of Electrical Engineering Ansan Technical College Kyunggi South Korea Department of Mechanical and Electrical Control Suncheon First College Choongnam South Korea Division of Electrical and Computer Engineering Hanyang University Seoul South Korea Department of Electrical Engineering Inha University Incheon South Korea

The characteristics of corona discharge in needle to plane electrodes have been simulated by a two-dimensional fluid method. It was assumed that the transport coefficients of nitrogen gas were only the function of reduced electric field. In this discharge mechanism, Townsend first ionization and a secondary electron emission were considered. The spatio-temporal distributions of electron and ion densities at three discharge steps were obtained by solving continuity equations using FCT algorithm. This paper also describes the effect of space charge on the electric field distribution.

关键词： Corona Electrons Electrodes Nitrogen Needles Ionization Poisson equations Computational modeling Educational institutions Space charge

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Geodesic Paths Approach to Color Image Enhancement

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Electronic Notes in Theoretical computer Science 2001年 46卷 146-160页

作者： M. Szczepanski B. Smolka D. Slusarczyk K.N. Plataniotis A.N. Venetsanopoulos Department of Automatic Control Silesian University of Technology Akademicka 16 Str 44-101 Gliwice Poland Edward S. Rogers Sr. Department of Electrical and Computer Engineering University of Toronto 10 King's College Road Toronto Canada

New filter class for multichannel image processing is introduced and analyzed. The new technique of image enhancement is capable of reducing impulsive and Gaussian noise and it significantly outperforms the standard methods of noise reduction. In the paper a smoothing operator, based on a random walk model and a fuzzy similarity measure between pixels connected by a digital geodesic path is introduced. The efficiency of the proposed method was tested on the standard color images using the objective image quality measures. Obtained results show that the new method not only outperforms standard noise reduction algorithms, but has some interesting features useful for segmentation of noisy color images.

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Feedback control for electromagnetic vibration feeder (application of two-degrees-of-freedom proportional plus integral plus derivative controller with nonlinear element)

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JSME International Journal, Series C: Mechanical Systems, Machine Elements and Manufacturing 2001年第1期44卷 44-52页

作者： Doi, Tomoharu Yoshida, Koji Tamai, Yutaka Kono, Katsuaki Naito, Kazufumi Ono, Toshiro Department of Systems and Control Engineering Faculty of Engineering Osaka Prefectural College of Technology 26-12 Saiwai-cho Neyagawa Osaka 572-8572 Japan Department of System Engineering Faculty of Computer Science and System Engineering Okayama Prefectural University 111 Kuboki Soja Okayama 719-1197 Japan Research and Development Department Ishida Co. Ltd. 959-1 Shimomagari Ritto-cho Kurita-gun Shiga 520-3026 Japan Department of Mechanical Systems Engineering College of Engineering Osaka Prefecture University 1 1 Gakuen-cho Sakai Osaka 599-8531 Japan

An electromagnetic-type vibratory feeder of is a typical transportation device used in automatic weighers. As existing feeders are driven by feedforward control, the so-called "firing angle control", the driver cannot negate sudden disturbances. In this study, we consider applying a feedback control for such a feeder system. First, we give the two details of modelings for the vibration part and for the electromagnetic force part. Next, a feedback control system is constructed for the electromagnetic vibration feeder for which we propose a two-degrees-of-freedom proportional plus integral plus derivative (PID) controller with nonlinear elements. Next, we apply the feedback control to the feeder with a standard trough. Finally, we consider a method compatible with many varieties of troughs by adjusting a nonlinear element. On the basis of the results of some experiments, we confirm that the two-degrees-of-freedom PID control is more effective than the conventional firing angle control.

关键词： Mechanics

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Effect of cavitation in water hydraulic poppet valves

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International Journal of Fluid Power 2001年第3期2卷 5-13页

作者： Oshima, Shigeru Leino, Timo Linjama, Matti Koskinen, Kari Tapio Vilenius, Matti Juhani Numazu College of Technology Control and Computer Engineering department Numazu Shizuoka 410-8501 3600 Ooka Japan Tampere University of Technology Institute of Hydraulics and Automation Tampere 33101 P.O. Box 589 Finland

In this paper, cavitation in water hydraulic poppet valves is investigated by an experimental method with a half cut test model. The situation of cavitation appearance, the effects of cavitation on the characteristics of flow rate, noise level, pressure distributions and the boundary of inception of the cavitation are investigated. Comparison between a poppet valve with sharp edged seat and another, which has a length on the seat, is made. The effects of change in the shape of the seat are discussed as well as the effect of cavitation appearance. As a result, it is revealed that the sharp edged seat valve is less influenced by the cavitation on its characteristics. © 2001 Taylor & Francis Group, LLC.

关键词： Cavitation Experimental study Half cut model Hydraulics Poppet valve Shape of valve seat Water

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The planning of solution to Istanbul's transportation problem with the coordination of transportation subsystems by the aid of GPS

The planning of solution to Istanbul's transportation proble...

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SICE Annual Conference

作者： A. Demirbilek H. Pastaci College of Electrical and Computer Engineering Electrical Engineering Control and Command Systems Department Turkish State Railways USA College of Electrical and Computer Engineering Electrical Engineering Control and Command Systems Department Yildiz Technical University Turkey

The Istanbul Transportation Information System has been established for the purpose of processing and storing data in a computer environment to arrange, in its most general sense, management service, coordination and planning activities related to transportation. The information system for this objective is one that is composed of a series of hardware and software components including data storage, data processing, data analysis and representation functions. A database called the transportation information system for evaluating the graphical and non-graphical data for the city of Istanbul has been formed. Moreover, some analyses are performed toward design and optimization based on a single intersection. Up-to-date data are accessed with an appropriate interrogation easily and efficiently.

关键词： Transportation Management information systems Environmental management Process planning Hardware Memory Data processing Data analysis Databases Cities and towns

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Design of coded targets and automated measurement procedures in industrial vision metrology 19

Design of coded targets and automated measurement procedures...

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19th International Congress for Photogrammetry and Remote Sensing, ISPRS 2000

作者： Hattori, Susumu Akimoto, Keiichi Fraser, Clive Ono, Tetsu Imoto, Harutaka Fukuyama University Dept. of Computer Science Japan Shikoku Polytechnic College Dept. of Control Engineering Japan University of Melbourne Dept. of Geomatics Australia Kyoto University Dept. of Global Engineering Japan Ishikawajima-Harima Heavy Industries Co. Ltd. Dept. of Production Engineering Japan

In industrial photogrammetric measurement with CCD cameras, the number of target images may amount to several hundred when large and complex objects are involved. It is therefore impractical to use solely manual means to identify these image points. This paper reports on a further design for coded targets, which can be automatically located and identified, and it also discusses special arrangements of reference targets called exterior orientation devices. These can be employed in conjunction with new computational schemes for sensor orientation to facilitate automated data processing. Procedures adopted to ensure sufficient speed and reliability in automated off-line digital photogrammetric measurements employing these developments, which have been found in practise to reduce data processing time by as much as 93%, are discussed and experimental results are reported. © 2000 International Society for Photogrammetry and Remote Sensing. All rights reserved.

关键词： CCD cameras

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Space resolution of adjacent reverse-side cracks using rotational magnetic flux sensor and neural network

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AIP Conference Proceedings 2000年第1期509卷 2029-2036页

作者： M. Oka M. Enokizono Department of Computer and Control Engineering Oita National College of Technology 1666 Maki Oita 870-0152 Japan Faculty of Engineering Oita University 700 Dannoharu Oita 870-1192 Japan

Nondestructive Evaluation (NDE) is very useful technology to prevent accidents. Since previous magnetic sensors for NDE cannot clearly distinguish adjacent reverse-side cracks on a metallic plate, existence of adjacent reverse-side cracks is a serious problem. Up to now, there are not many discussions about space resolution of the magnetic sensor. So, it is important that adjacent small reverse-side cracks are clearly resolved in to two cracks by the magnetic sensor. The rotational magnetic flux sensor with a differential search coil is characterized by the rotational excitation and three differential output signals. And, it shows high sensitivity and high signal-to-noise ratio (S/N) to detection of a small reverse-side crack on a 5 mm thick steel plate (SS400). In this paper, we present the new NDE system such as the rotational magnetic flux sensor with the differential search coil with the neural network. And, space resolution of this NDE system is discussed. It can clearly separate adjacent reverse-side cracks (the depth of cracks is 2 mm, the distance between two cracks is 2 mm). The new NDE system shows a good capability for separation of adjacent reverse-side cracks on a 5 mm thick steel plate.

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control strategy of one link flexible arm for contact motion to moving object

Control strategy of one link flexible arm for contact motion...

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International Workshop on Advanced Motion control (AMC)

作者： Y. Morita Y. Shimada H. Ukai H. Kando N. Matsui Department of Electronic Control Engineering Gifu National College of Technology Gifu Japan Department of Electrical & Computer Engineering Nagoya Institute of Technology Nagoya Japan

Presents a control strategy of a one link flexible arm for the contact motion with a moving object. Our purpose is to accomplish the smooth transition from the free space to the constraint space without changing control laws at collision. We design the controller based on the model following servo system with two additional compensators. One is the stabilizing compensation based on strain feedback and the other is the approaching velocity compensation based on a relative displacement feedback. In order to improve the force tracking performance, we determine the relative displacement feedback gain so as to minimize a performance index. Moreover, we virtually adjust the desired force to realize the high-speed approaching motion. Some experimental results show the effectiveness of the proposed controller.

关键词： Motion control Force control Space technology Servomechanisms Velocity control Capacitive sensors Force feedback Elasticity Manipulators Educational institutions

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Application of a neural predictive controller in boost converter input current control

Application of a neural predictive controller in boost conve...

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IEEE International Symposium on Intelligent control (ISIC)

作者： I. Petrovic M. Baric A. Magzan N. Peric Fac. of Electr. Eng. Zagreb Univ. Croatia Faculty of Electrical Engineering and Computing Department of Control and Computer Engineering in Automation University of Zagreb Zagreb Croatia College of Electrical Engineering Polytechnics College of Zagreb Zagreb Croatia

The application of a nonlinear predictive controller in the cascade control structure of a boost converter is investigated. The neuro-predictive controller is realized as a nonlinear optimizer, using the Levenberg-Marquardt unconstrained optimization procedure. For the prediction of future process responses, two MLP neural networks are used. One network is used for modeling the converter dynamics and the other for online estimation of the converter's input voltage. This structure ensures good system performance in all operating regions and inherent compensation of ripples in the converter's input current caused by variations of the input voltage. The advantages of the proposed control structure are demonstrated through experimental comparison with a linear GPC with manually adjusted feedforward compensator.

关键词： Current control Voltage control control systems Automatic control Pulse width modulation Switches Rail transportation Current measurement Electric current control Application software

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Stability issues of finite precision state estimate feedback controller realizations for discrete time systems

Stability issues of finite precision state estimate feedback...

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American control Conference (ACC)

作者： Jun Wu Sheng Chen Gang Li R.H. Istepanian Jian Chu J.F. Whidborne National Laboratory of Industrial Control Tech Institute of Advanced Process Control University of Zhejiang Hangzhou China Department of Electronics and Computer Science University of Southampton Southampton UK The school of EEE Nanyang Technological University Singapore Department of Electrical and Computer Engineering Ryerson Polytechnic University Toronto ONT Canada National Laboratory of Industrial Control Tech. Institute of Advanced Process Control University of Zhejiang Hangzhou China Department of Mechanical Engineering King''s College London UK

This paper present a new effective algorithm for the optimal realization of state estimate feedback controller structures for discrete time systems subject to finite-word-length constraints. The problem is formulated as a nonlinear programming to provide an easy and efficient optimization tool to solve such a complex problem. Simulation results of the optimum realizations of state estimate feedback controller structures are presented to illustrate the effectiveness of the proposed strategy.

关键词： Stability State estimation Adaptive control control systems Digital control Industrial control Process control Educational institutions Discrete time systems Signal design

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