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Evaluation of plane bending fatigue damage in metallic plates using the thin-film flux-gate magnetic sensor

AIP Conference Proceedings 2002年第1期615卷 1553-1560页

作者： M. Oka T. Yakushiji Y. Tsuchida M. Enokizono 1Department of Computer and Control Engineering Oita National College of Technology 1666 Maki Oita 870-0152 Japan 2Department of Mechanical Engineering Oita National College of Technology 1666 Maki Oita 870-0152 Japan 3Faculty of Engineering Oita University 700 Dannoharu Oita 870-1192 Japan

To estimate the amount of fatigue damage in metallic plates such as steel and stainless steel, we have investigated the relationship between the amount of plane bending fatigue damage and residual magnetization. The magnetic flux density in the Z component (Bz) at 1 mm above a specimen caused by residual magnetization is measured by using a thin-film flux-gate magnetic sensor. From the results of our experiment, the magnetic flux density has clear dependence on the increase of bending stress and the number of stress cycles in austenitic stainless steel. The distribution of Bz on steel plates is changed by the amount of plane bending fatigue damage. But, the relationship between the change of Bz and the number of stress cycles is not clear in the case of steel plates. In this paper, the relationship between the amount of plane bending fatigue damage and residual magnetization in metallic plates is discussed.

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On the uniform posture map algorithm for an articulated body

On the uniform posture map algorithm for an articulated body

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IEEE International Symposium on Virtual and Intelligent Measurement Systems, VIMS 2002

作者： Kim, Jin Ok Lee, Bum Ro Chung, Chin Hyun School of Electrical and Computer Engineering SungKyunKwan University 300 Chunchun-dong Jangan-gu Suwon Kyunggi-do440-746 Korea Republic of Department of Information and Control Engineering Kwangwoon University 447-1 Wolgye-dong Nowon-gu Seoul139-701 Korea Republic of

ISBN: (纸本)0780373448

It is important to reuse existing motion capture data for reduction of the animation producing costs as well as the efficiency of the producing process. Because its motion curve has no control point, however, captured data is difficult to modify interactively. Motion transition is a useful method for reusing existing motion data It generates a seamless intermediate motion with two short motion sequences. In this paper, the Uniform Posture Map (UPM) is proposed to perform motion transitions. The UPM is organized through the quantization of various postures with an unsupervised learning algorithm;it places the output neurons with similar postures in adjacent positions. Using this property, an intermediate posture of applied two postures is generated;the generating posture is used as a key-frame to make an interpolating motion. The UPM needs fewer computational costs, in comparison with other motion transition algorithms. It provides a control parameter;an animator can not only control the motion simply by adjusting this parameter, but also produce animation interactively. The UPM prevents the generating of the invalid output neurons to present unreal postures in the learning phase;thus, it makes more realistic motion curves;finally it contributes to the making of more natural motions. The motion transition algorithm proposed in this paper can be applied to various fields such as real time 30 games, virtual reality applications, and web 30 applications. © 2002 IEEE.

关键词： Animation

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STABILIZATION AND ROBUST control OF METAL ROLLING MODELED AS A 2D LINEAR SYSTEM

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IFAC Proceedings Volumes 2002年第1期35卷 185-190页

作者： K. Galkowski W. Paszke E. Rogers D.H. Owens Institute of Control and Computation Engineering University of Zielona Gora Poland Department of Electronics and Computer Science University of Southampton Southampton SO17 1BJ UK Department of Automatic Control and Systems Engineering University of Sheffield Sheffield S1 3JD UK

Repetitive processes are a distinct class of 2D linear systems with applications in areas ranging from long-wall coal cutting and metal rolling operations through to iterative learning control schemes. The main feature which makes them distinct from other classes of 2D linear systems is that information propagation in one of the two independent directions only occurs over a finite duration. This, in turn, means that a distinct systems theory must be developed for them, which can then be translated (if appropriate) into efficient routinely applicable controller design algorithms for applications domains. In this paper, we give some new results on LMI based stabilization and robust control of so-called discrete linear repetitive processes and illustrate them by application to a metal rolling process.

关键词： 2D linear systems metal rolling robust control

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Model reference parametric adaptive iterative learning control 15th

Model reference parametric adaptive iterative learning contr...

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15th World Congress of the International Federation of Automatic control, 2002

作者： Yu, H. Deng, M. Yang, T.C. Owens, D.H. School of Engineering and Computer Science Exeter University ExeterEX4 4QF United Kingdom School of Engineering and Information Technology Sussex University BrightonBN1 9QT United Kingdom Department of Automatic Control and Systems Sheffield University SheffieldS1 3JD United Kingdom

ISBN: (纸本)9783902661746

Most of iterative learning control (ILC) methods requires that the relative degree of the plant is less than 2 for a linear system or the plant is passive for a non-linear system. A new model reference parametric adaptive iterative learning control using the command generator tracker (CGT) theory is proposed in this paper. The method can be applied to control a plant with a higher relative degree and it only requires to iteratively adjust nm + 2 parameters for an SISO plant. Therefore, the ILC control system is very simple. The proposed method is in the spirit of simple adaptive control which has received intensive researches during past two decades. Simulation results show the effectiveness and usefulness of the proposed method. Copyright © 2002 IFAC.

关键词： Model reference adaptive control

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Structure formation, tearing and merging of relativistic electron beam propagating through a laser produced plasma

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AIP Conference Proceedings 2002年第1期611卷 329-339页

作者： T. Taguchi T. M. Antonsen, Jr. C. S. Liu K. Mima Y. Sentoku H. Nagatomo H. Sakagami 1Department of Electrical Engineering Setsunan University Neyagawa Osaka Japan 2Institute for Plasma Research University of Maryland College Park Maryland 3Institute of Laser Engineering Osaka University Suita Osaka Japan 4Department of Computer Engineering Himeji Institute of Technology Himeji Hyogo Japan

Hot electron transport in a high density plasmas has been studied using a two dimensional hybrid code. The results show that the initially cylindrical solid beam evolves into a hollow, annular beam due to the Weibel instability and generates strong magnetic fields on both sides of the annular ring. The annular structure subsequently breaks up into several beamlets due to a mechanism similar to a tearing instability. It is found that the magnetic fields parallel to the direction of beam propagation also grow during the tearing process. These beamlets are attract each other and finally they merged into a single beam which carries a net electric current. The tearing and merging processes have also been analyzed by the hybrid code for a uniform initial condition to determine an asymptotic behaviors of the total number of hot electron beams. We also have performed a three dimensional particle-in-cell (PIC) simulation to compare with the results of 2D hybrid code. It shows that the spatial variation of cold electron density is much more uniform than that obtained by 2D code.

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POSITIVE REALNESS AND THE ANALYSIS OF A CLASS OF 2D LINEAR SYSTEMS

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IFAC Proceedings Volumes 2002年第1期35卷 219-224页

作者： K. Galkowski W. Paszke B. Sulikowski E. Rogers S. Xu J. Lam Z. Lin D.H. Owens Institute of Control and Computation Engineering University of Zielona Gora Poland Department of Electronics and Computer Science University of Southampton Southampton SO17 1BJ UK Departament of Electrical and Computer Engineering University of Alberta Edmonton Alberta Canada T6G 2V4 Department of Mechanical Engineering University of Hong Kong School of EEE Nanyang Technological University Nanyang Ave. 639798 Singapore Department of Automatic Control and Systems Engineering University of Sheffield Sheffield S1 3JD UK

Repetitive processes are a distinct class of 2D linear systems with applications in areas ranging from long-wall coal cutting and metal rolling operations through to iterative learning control schemes. The main feature which makes them distinct from other classes of 2D linear systems is that information propagation in one of the two independent directions only occurs over a finite duration. This, in turn, means that a distinct systems theory must be developed for them, which can then be translated into efficient routinely applicable controller design algorithms for applications domains. In this paper, we give the first significant results on a positive realness based approach to the analysis of these processes.

关键词： 2D linear systems repetitive processes positive realness

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MODEL REFERENCE PARAMETRIC ADAPTIVE ITERATIVE LEARNING control

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IFAC Proceedings Volumes 2002年第1期35卷 469-474页

作者： H. Yu M. Deng T.C. Yang D.H. Owens School of Engineering and Computer Science Exeter University Exeter EX4 4QF School of Engineering and Information Technology Sussex University Brighton BN1 9QT Department of Automatic Control and Systems Sheffield University Sheffield S1 3JD

Most of iterative learning control (ILC) methods requires that the relative degree of the plant is less than 2 for a linear system or the plant is passive for a non-linear system. A new model reference parametric adaptive iterative learning control using the command generator tracker (CGT) theory is proposed in this paper. The method can be applied to control a plant with a higher relative degree and it only requires to iteratively adjust n m + 2 parameters for an SISO plant. Therefore, the ILC control system is very simple. The proposed method is in the spirit of simple adaptive control which has received intensive researches during past two decades. Simulation results show the effectiveness and usefulness of the proposed method.

关键词： Iterative learning control Adaptive control Strictly positive real Model reference control

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Recent developments in thermosonic crack detection

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AIP Conference Proceedings 2002年第1期615卷 552-557页

作者： Xiaoyan Han L. D. Favro Zhong Ouyang R. L. Thomas 1Department of Electrical and Computer Engineering Wayne State University Detroit Michigan 48202 2Physics Department and Institute for Manufacturing Research Wayne State University Detroit Michigan 48202 3Institute for Manufacturing Research Wayne State University Detroit Michigan 48202 4Physics Department and College of Science Wayne State University Detroit Michigan 48202

We describe recent developments in thermosonic crack detection. This technique uses a single short pulse of sound to cause cracks to heat up and become visible in the infrared. A low frequency (15 to 40 kHz) ultrasonic transducer fills the sample with sound that causes frictional heating at crack interfaces. We show that the technique can be applied equally well to quite large and irregularly shaped objects, and to small delicate objects using the same apparatus. We present examples of this technology applied to cracks as small as 20 microns and as large as several inches, and to materials ranging from brittle ceramics, to soft metals and composites.

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Nondestructive evaluation of FRP composite bridge components using infrared thermography

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AIP Conference Proceedings 2002年第1期615卷 1303-1309页

作者： U. B. Halabe H. AlQennah H. V. S. GangaRao P. Klinkhachorn E. S. Sazonov 1Department of Civil and Environmental Engineering Constructed Facilities Center West Virginia University Morgantown West Virginia 26506-6103 2RBA Group 600 Old Pond Road Bldg. 500 Suite 501 Bridgeville Pennsylvania 15017 3Lane Department of Computer Science and Electrical Engineering Constructed Facilities Center West Virginia University Morgantown West Virginia 26506-6104

This paper presents the findings of an experimental study on the use of Infrared Thermography for nondestructive evaluation of subsurface delaminations in Fiber Reinforced Polymer (FRP) composite bridge decks and concrete columns wrapped with FRP jackets. Composite bridge deck specimens were constructed in the laboratory with varying delamination sizes. The infrared images from the delaminated specimens were compared with undamaged specimens to study the effect of subsurface delaminations on the infrared images. In addition, field tests were conducted using infrared thermography on composite structural members of three bridges located in West Virginia.

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control of microwave-propelled sails using delayed measurements

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AIP Conference Proceedings 2002年第1期608卷 452-456页

作者： E. Schamiloglu C. T. Abdallah D. Georgiev J. Benford G. Benford 1Department of Electrical and Computer Engineering University of New Mexico Albuquerque New Mexico 87131 2Department of Mechanical Engineering University of New Mexico Albuquerque New Mexico 87131 3Microwave Sciences Inc. 1041 Los Arabis Lane Lafayette California 94549 4Department of Physics and Astronomy University of California Irvine 4129 Frederick Reines Hall Irvine California 92697-4575

This paper is concerned with the control of carbon fiber sail structures that are being studied in a series of experiments at the Jet Propulsion Laboratory (JPL) and at the University of California, Irvine. The passive dynamic stability in the one-dimensional (1-D) case was studied in an earlier paper in terms of the fixed points of the trajectories for the governing equations of motion. The simple 1-D model introduced the possibility of controlling a microwave-propelled sail using various nonlinear control strategies, using both position and velocity measurements. In the current paper, we assume that velocity measurements are unavailable, and that the position measurements are delayed (due to the finite speed of light). We then use a novel feedback that employs delayed position measurements only to stabilize the sail about an equilibrium position. The paper will also contain preliminary results on studying the stability of the full 3-D sail model, and potential control strategies.

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