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International Conference on Electrical and control engineering (ICECE)

作者： Kuan-Chen Lin Yi-Ming Tsao Yao-Lun Tseng Department of Control and Automation Engineering Far East University Tainan County Taiwan Institute of Mechanical Engineering Far East University Tainan County Taiwan

This paper proposes a novel feedrate control scheme utilized in real-time non-uniform rational B-spline (NURBS) interpolation algorithm for the contouring control purpose. The objective is to improve the contour error performance to achieve high-precision standard. The proposed structure can provide the action that once the contour error is large in the relative sense, then the feedrate will be adequately reduced to provide sufficient time for controller to settle. By real-time adjusting the feedrate, contour error will not accumulate such that the precision can be effectively improved. Experiments are conducted to validate the effectiveness of the proposed method and comparison with other control methods is also arranged. All the obtained results indeed demonstrate the effectiveness of this method.

关键词： Spline Real time systems Surface topography Surface reconstruction Interpolation Trajectory Heuristic algorithms

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Delay-fractioning-dependent Robust stabilization of nonlinear networked control systems

Delay-fractioning-dependent Robust stabilization of nonlinea...

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Chinese control and Decision Conference, CCDC

作者： Engang Tian Dong Yue Chen Peng School of Electrical and Automation Engineering Nanjing Normal University Nanjing China Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan China

A Delay-fractioning-dependent method is proposed to investigate the stability and stabilization for nonlinear networked control systems (NNCSs), which are presented in the form of T-S fuzzy model with time-varying input delay. Different from the existing method in dealing with the time-varying delay, the whole variation interval of the delay is divided into two subintervals with equal length. Respecting for the delay belonging to different subintervals, new criteria on stability analysis of the NNCSs are obtained by checking the variation of the derivative of the Lyapunov functional in the two subintervals. Then, criteria for the stability of the NNCSs are obtained by using the convexity properties of the matrix inequality and some other new analysis techniques, which are shown in terms of nonlinear matrix inequalities and can be solved by using a cone complementarity liberalization method. Numerical examples show that the proposed method can reduce the conservativeness greatly.

关键词： Robust control Networked control systems Stability analysis Delay effects Nonlinear control systems Fuzzy systems Linear matrix inequalities Fuzzy control Delay systems Communication system control

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Dynamics and modal control of piezoelectric tube actuators

Dynamics and modal control of piezoelectric tube actuators

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5th IFAC Symposium on Mechatronic Systems, MECHATRONICS 2010

作者： Van Hulzen, Jan R. Schitter, Georg Van Den Hof, Paul M.J. Van Eijk, Jan Delft Center for Systems and Control Delft University of Technology Mekelweg 2 2628 CD Delft Netherlands Automation and Control Institute Vienna University of Technology Gusshausstrasse 27-29 1040 Vienna Austria Department of Precision and Microsystems Engineering Delft University of Technology Mekelweg 2 2628 CD Delft Netherlands

ISBN: (纸本)9783902661760

In piezoelectric positioning systems the achievable bandwidth is often limited by weakly damped resonant modes. System performance may be improved by avoiding the excitation of these modes. If sufficient mechanical damping is present this can be done by shifting resonant modes towards anti-resonant modes through manipulation of the mechanical boundary conditions. In a second approach the anti-resonances may be shifted towards the resonances by the application of modal actuation. Using this method the excitation of the second and higher order modes is avoided by changing the distribution of actuation forces. This paper investigates and compares the application of modal control techniques in systems based on piezoelectric tube actuators such as atomic force microscopes using finite element analysis and experimental verification. © 2010 IFAC.

关键词： Finite element method

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Editorial Special issue on approximate dynamic programming and reinforcement learning

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控制理论与应用（英文版） 2011年第3期 309-309页

作者： Silvia Ferrari Jagannathan Sarangapani Frank L. Lewis Laboratory for Intelligent Systems and Control(LISC)Department of Mechanical Engineering & Materials Science Box 90300 Duke University Durham NC 27708-0005 Department of Electrical & Computer Engineering University of Missouri-Rolla MO 65401 U.S.A. Automation and Robotics Research Institute The University of Texas at Arlington 7300 Jack Newell Blvd. S Ft. Worth Texas 76118-7115 U.S.A.

We are extremely pleased to present this special issue of the Journal of control Theory and *** dynamic programming (ADP) is a general and effective approach for solving optimal control and estimation problems by adapting to uncertain environments over *** optimizes the sensing objectives accrued over a future time interval with respect to an adaptive control law,conditioned on prior knowledge of the system,its state,and uncertainties.A numerical search over the present value of the control minimizes a Hamilton-Jacobi-Bellman (HJB) equation providing a basis for real-time,approximate optimal control.

关键词： reinforcement learning dynamic programming optimal control effective approach prior knowledge control Theory real-time control law problems special search future ADP basis

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Observer-based estimation of pressure signals in hydrostatic transmissions

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IFAC Proceedings Volumes 2010年第7期43卷 425-430页

作者： Horst Schulte Patrick Gerland University of Applied Science Berlin (HTW) Department of Engineering I Electrical Engineering and Automation Wilhelminenhofstr. 75A 12459 Berlin Germany University of Kassel Faculty of Mechanical Engineering Measurement and Control Moenchebergstr. 7 34125 Kassel Germany

Hydrostatic transmissions, also called hydrostatic gears, have been widely used in mobile working machines and off-road vehicles such as construction and agricultural machines. This kind of transmission offers important advantages like continuously variable transmission with high power density, maximum tractive force at low speeds and reversing without changing gear. The automatic electronic control of hydrostatic transmissions, which depend on a number of measurable values, has become more common in industrial practice. To ensure the reliability and safety at least a two-channel redundant system for the measuring channels is required. In this paper, a general model-based approach using a Takagi-Sugeno (T-S) fuzzy observer for analytical redundancy of the oil pressure measuring process in hydrostatic transmissions is developed. It has been shown by experimental results that this approach can be used to estimate the pressure values under varying load conditions and different driving situations.

关键词： observer design failure detection hydraulic systems

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Big bang - big crunch learning method for fuzzy cognitive maps

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World Academy of Science, engineering and Technology 2010年 71卷 815-824页

作者： Yesil, Engin Urbas, Leon Institute of Automation Dresden University of Technology D-01062 Dresden Germany Faculty of Electrical and Electronics Engineering Control Engineering Department Istanbul Technical University Maslak TR-34469 Istanbul Turkey

Modeling of complex dynamic systems, which are very complicated to establish mathematical models, requires new and modern methodologies that will exploit the existing expert knowledge, human experience and historical data. Fuzzy cognitive maps are very suitable, simple, and powerful tools for simulation and analysis of these kinds of dynamic systems. However, human experts are subjective and can handle only relatively simple fuzzy cognitive maps;therefore, there is a need of developing new approaches for an automated generation of fuzzy cognitive maps using historical data. In this study, a new learning algorithm, which is called Big Bang-Big Crunch, is proposed for the first time in literature for an automated generation of fuzzy cognitive maps from data. Two real-world examples;namely a process control system and radiation therapy process, and one synthetic model are used to emphasize the effectiveness and usefulness of the proposed methodology.

关键词： Fuzzy Cognitive Maps

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Automatic estimation of light sleep level during short nap

Automatic estimation of light sleep level during short nap

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15th International Symposium on Artificial Life and Robotics, AROB '10

作者： Wang, Bei Sugi, Takenao Wang, Xingyu Shirakawa, Shuichiro Nakamura, Masatoshi Department of Automation East China University of Science and Techonology Shanghai China Department of Electrical and Electronic Engineering Saga University Saga Japan National Centre of Neurology and Psychiatry Tokyo Japan Research Institute of Systems Control Institute for Advanced Research and Education Saga University Saga Japan

ISBN: (纸本)9784990288044

Short nap is a good relaxation way when people feel sleepy and tired during the day time. An automatic light sleep level estimation technique was presented for short nap sleep evaluation. Parameters were extracted from the polysommnographic sleep record. Sleep stages of open eyes awake, close eyes awake, and stage 1 were determined automatically based on the conditional probability. The conditional probability indicated the possibility of occurrence of sleep stages during short nap. The light sleep level was estimated based on the continuous change of conditional probability of awake. The developed technique can be usable for comfortable short nap sleep control. © 2010 ISAROB.

关键词： Probability

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Fault isolation for shipboard decision support

Fault isolation for shipboard decision support

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作者： Lajic, Zoran Blanke, Mogens Nielsen, Ulrik Dam Technical University of Denmark Department of Mechanical Engineering Section of Coastal Maritime and Structural Eng.Build. 403 2800-Kgs. Lyngby Denmark Technical University of Denmark Department of Electrical Engineering Automation and Control Group Build. 326 2800-Kgs. Lyngby Denmark Norwegian University of Technology and Science Centre for Ships and Ocean Structures 7491 Trondheim Norway

ISBN: (纸本)9783902661876

Fault detection and fault isolation for in-service decision support systems for marine surface vehicles will be presented in this paper. The stochastic wave elevation and the associated ship responses are modeled in the frequency domain. The paper takes as an example fault isolation of a containership on which a decision support system has been installed and it will be demonstrated that all the faults can be isolated. The paper shows how a shipboard decision support system could become highly reliable and comprise built-in supervision of the quality of the sensor signals that are crucial to the quality of decisions given to navigators. Copyright © 2010 IFAC.

关键词： Decision support systems

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Effects of interfacial pressure on tracking failure at XLPE cable joint by analyzing discharge light distribution

Effects of interfacial pressure on tracking failure at XLPE ...

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IEEE International Conference on Solid Dielectrics (ICSD)

作者： B. X. Du L. Gu Key Laboratory of Power System Simulation and Control of Ministry of Education Department of Electrical Engineering School of Electrical Engineering and Automation Tianjin University TJU Tianjin China

This paper investigated the effects of interfacial pressure on the discharge and tracking failure at the interface between XLPE and silicon rubber by analyzing the distribution of discharge light emitted during the failure process. The test sample was made by pressing together a piece of XLPE and a piece of transparent silicon rubber with the pressure of 20 kN/cm 2 , 100 kN/cm 2 and 300 kN/cm 2 , respectively. Test voltage was applied to a pair of plate-needle electrodes sandwiched at the interface with the insulation distance of 10 mm. The initial discharge voltage, the discharge light from discharge to tracking failure and the tracking patterns after failure were recorded with a digital camera. Then the discharge light was analyzed with an image processing method. Results show that the initial discharge voltage increases with the increase of pressure, which significantly influences the distribution characteristics of the discharge light and tracking pattern at the interface. The analysis of discharge light distribution is helpful in understanding the failure process and its mechanism at the interface between XLPE and silicon rubber found in prefabricated cable joint.

关键词： Discharges Insulation life Degradation Brightness Power cables Rubber Silicon

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Effect of temperature on electrical tree in silicone rubber

Effect of temperature on electrical tree in silicone rubber

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IEEE International Conference on Solid Dielectrics (ICSD)

作者： B. X. Du Z. L. May Gao T. Han Key Laboratory of Power System Simulation and Control of Ministry of Education Department of Electrical Engineering School of Electrical Engineering and Automation Tianjin University TJU Tianjin China

In this paper, room temperature vulcanized (RTV) silicone rubber (SiR) was employed as test sample to investigate the relationship between electrical tree propagation characteristics and the experiment temperature. Both the structures and growth characteristics of electrical tree in SiR were observed by using a digital camera and a microscope system. Obtained results show that electrical tree in RTV SiR is white gap tree channel, which all initiate from single branch, and the width of initiative single branch channel varies a lot with the electrical tree structure. The structure of electrical tree at experiment temperature from 30°C to 90°C in RTV SiR can be classified into four categories. They are branch, bush, pine branch and bush-pine mixed tree. The distribution of tree structures changes with the experiment. At the temperature of 30°C, branch tree take up a great proportion, however, bush tree becomes the dominant structure when the temperature rise up to 60°C and 90°C. The probability of tree initiation decreases obviously with the rise of the experiment temperature from 30°C to 90°C. All kinds of electrical tree grow rapidly in the first beginning of the treeing propagation, and this process lasts only a few minutes. In addition, a new parameter, the treeing proportion is introduced to describe propagation characteristics of bush tree.

关键词： Electrodes Rubber Temperature distribution Needles Power cables Cable insulation

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