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International Journal of Signal Processing, Image Processing and Pattern Recognition 2015年第6期8卷 245-252页

作者： Yu, Jintao Li, Xian Ding, Mingli Dong, Shicheng Li, Junling School of Computer and Information Engineering Harbin University of Commerce Harbin China Dept. of Automatic Test and Control Harbin Institute of Technology Harbin China

Weld seam recognition is the key technique in visual tracking research. Based on the weld image features, the image preprocessing and the linear feature extraction method of the weld seam recognition are designed. The extended adaptive median filtering method and modified Otsu adaptive threshold selection method for image segmentation are used in the image pre-processing process, to remove the noise and compress the image data. Through comparing with several other edge operators, the Roberts operator is chosen to achieve the goal of detecting the welding edge. Finally, the weld seam information is extracted through Hough transform and a satisfied result can be acquired. The study provides a theoretical support for the following designing of the weld tracking system. © 2015 SERSC.

关键词： Welds

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Online Parameter Identification Method for IPMSM Drive with MTPA

Online Parameter Identification Method for IPMSM Drive with ...

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International Conference on Electrical Machines and systems

作者： Peerasin Phowanna Sudchai Boonto Mongkol Konghirun Dept. of Electrical Engineering King Mongkut's University of Technology Thonburi Bangkok Thailand Dept. of Control System and Instrumentation Engineering King Mongkut's University of Technology Thonburi Thailand

ISBN: (纸本)9781479988068

This paper presents the online identification method for interior permanent-magnet synchronous motor (IPMSM) drive system with the maximum torque per ampere (MTPA). The inductances of the motor are identified by recursive least square (RLS) method based on mathematical model, considering the flux saturation state. Using this technique, the improvement of the MTPA trajectory for IPMSM can be implemented along with the effect of magnetic flux. This final paper presents an idea and a procedure of the proposed algorithm. The simulation results are carried out and presented.

关键词： RLS MTPA IPMSM

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Backscatter tag based on frequency selective surface for FMCW radar applications

Backscatter tag based on frequency selective surface for FMC...

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URSI Atlantic Radio Science Conference (URSI AT-RASC)

作者： J. Lorenzo A. Lazaro R. Villarino D. Girbau Dept. of Electronics Electrics and Automatic control Engineering Rovira i Virgili University Av. Paisos Catalans 26 43007 Tarragona Spain

FMCW radar has been proposed in the literature as a reader for long distance transponders for wireless local positioning systems and sensing. One of the major challenges for positioning and for RFID systems are the disturbances due to multipath propagation. In addition, low-cost FMCW radars are often based on homodyne receivers, where the minimum measurement distance is limited by the transmitter coupling and the phase noise interference in the low-frequency band of the spectrum. To mitigate these problems, backscatter transponders have been proposed. This works presents an actively-controlled frequency selective surface (FSS) to implement a backscatter transponder at X band. The FSS is composed by dipoles loaded with PIN diodes which act as switching elements. The transponder exploits the change in the radar cross section (RCS) of the FSS to modulate the field illuminated by the FMCW radar. This change is performed varying the bias of the diodes. The basic operation theory of the system will be described. An experimental setup based on a commercial 9.25–10.75 GHz FMCW radar working as a reader is proposed to measure the transponders. The transponder response can be distinguished from the interference of non-modulated clutter, modulating the transponder's RCS. Some FSS with different number of dipoles are studied, as a proof of concept. Measurements at several distances are provided with a 10 dipoles prototype. The tag distance can be obtained from the frequency offset between the peaks around the modulating frequency. The standard deviation error is 12 cm.

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Accomplish multi-robot tasks via Petri net models

Accomplish multi-robot tasks via Petri net models

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IEEE International Conference on Automation Science and engineering (CASE)

作者： Marius Kloetzer Cristian Mahulea Dept. of Automatic Control and Applied Informatics Technical University of Iasi Romania Aragon Institute of Engineering Research (I3A) University of Zaragoza Spain

This paper proposes a method for planning a team of mobile robots such that they accomplish a set of tasks. The environment and the movement capabilities of mobile robots are represented by a Petri net model. Each task is located in a given location and its accomplishment requires a certain number of robots to be present in that place. The order for serving the tasks and firing count vectors for the model result from solving an Integer Linear Programming optimization. Structural properties of the Petri net model allow us to develop an algorithm that produces robot strategies composed from movements, waiting and task serving.

关键词： Mathematical model Petri nets Collision avoidance Mobile robots Optimization Resource management

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A study on a substation static load model including the mobility of a railway load

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Transactions of the Korean Institute of Electrical Engineers 2015年第2期64卷 315-323页

作者： Chang, Sang-Hoon Youn, Seok-Min Kim, Jung-Hoon Korea Railroad Research Institute Korea Republic of Dept. of Electricity Control System Engineering Hongik University Seoul Korea Republic of School of Electrical Engineering Hongik University Korea Republic of

Nowadays, it is expected that mobility loads such as electric railways and electric vehicles will be penetrated gradually and affect on the power system stability by their load characteristics. Various researches have been carried out about electric vehicles for the recent decade though the load of electric railway could be forecasted because of the specified path and timetable, is a field with a long historic background. Some precise 5th polynomial equations are required to analyze the power system stability considering mobility load to be increased in the immediate future while the electric railway dispatching simulator uses load models with constant power and constant impedance for the system analysis. In this paper, seasonal urban railway load models are established as the form of 5th polynomial equations and substation load modeling methods are proposed merging railway station load models and general load models. Additionally, load management effects by the load modeling are confirmed through the case studies, in which seasonal load models are developed for Seoul Subway Line No. 2, Gyeongui Line and Airport Railroad and the substation load change is analyzed according to the railway load change. © The Korean Institute of Electrical Engineers.

关键词： Railroads

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A discrete-time current controller for permanent magnet synchronous motor drives

A discrete-time current controller for permanent magnet sync...

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Annual Conference of Industrial Electronics Society

作者： Türker Türker Ümit Büyükkeleş Hüseyin Meşe Faruk Bakan Dept. of Control & Automation Engineering Yildiz Technical University Istanbul Turkey Defence System Technologies ASELSAN A.S. Ankara Turkey Dept. of Electrical Engineering Yildiz Technical University Istanbul Turkey

A discrete-time current controller is presented for the current loop of the permanent magnet synchronous motor drives. Firstly, the difference equations of current errors are obtained for constant reference values. Then, a dead-beat controller is designed to drive the dq-axes currents to the desired values. Discrete-time integral action with an anti-windup scheme is added to the dead-beat structure to achieve a better steady-state behaviour. In order to improve the transient properties of the controller, a current prediction scheme based on dead-beat structure is also introduced to the controller. Finally, the proposed controller is implemented through numerical simulations to illustrate the effectiveness for both transient and steady-state responses.

关键词： Torque Pulse width modulation Delays Numerical simulation Uncertainty Current measurement Current control

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A Matlab-based interactive simulator for mobile robotics

A Matlab-based interactive simulator for mobile robotics

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IEEE International Conference on Automation Science and engineering (CASE)

作者： Ramon Gonzalez Cristian Mahulea Marius Kloetzer Aragón Institute of Engineering Research (I3A) University of Zaragoza Spain Dept. of Automatic Control and Applied Informatics Technical University of Iasi Romania

This paper presents an open-source Matlab-based interactive software tool for teaching mobile robotics in introductory courses. In particular, it deals with the subjects: modeling, path planning, and motion control. This simulator offers the advantage of testing different aspects related to these fundamental topics and instantly seeing the result in a Graphical User Interface (GUI). This fact leads to a high realism in interactivity, while no previous knowledge in Matlab or programming is required. Additionally, it constitutes an easily scalable tool, the GUI has been properly designed with just one single window with straightforward and intuitive buttons, icons, and figures. Some illustrative examples demonstrate the benefits of the proposed simulator.

关键词： Mobile robots Trajectory Wheels MATLAB

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An Inertial Sensor based Balance and Gait Analysis system

An Inertial Sensor based Balance and Gait Analysis System

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IEEE International Symposium on Circuits and systems

作者： Wei-Hsin Wang Pau-Choo Chung Guo-Liang Yang Chien-Wen Lin Yu-Liang Hsu Ming-Chyi Pai Dept. of Electrical Engineering National Cheng Kung University Tainan Taiwan (China) Dept. of Automatic Control Engineering Feng Chia University Taichung Taiwan (China) Dept. of Neurology and Alzheimer's Disease Research Center National Cheng Kung University Tainan Taiwan (China)

ISBN: (纸本)9781479983926

Time-up and Go Test (TUGT) is a common clinical motility test for the elderly. Currently it is measured manually, which is human resource consuming, less accurate, and limited in capability of measuring sophisticated parameters. In this paper, we propose a system consisting of three inertial-sensor-based measuring components, a remote controller, and an analysis software for automatic balance and gait analysis in TUGT. This system is designed to be of easy use with the software automatically measuring the time intervals of stand-up time, sit-down time, and the total time of test. In addition, the system can also obtain the gait information of stride time, swing time, and stance time. To validate the system, we compared the performance with that obtained from stopwatch using videos as the gold standard. The results indicate that the system not only provides a convenient way of measurement but also achieves higher accurate and reliable measurement results than using stopwatch. We use this system to compare the Alzheimer's disease patients (ADs) with health controllers (HCs). The results show that the ADs need longer stand-up time, sit-down time, and total time while taking the TUGT compared to the HCs. The stride time, swing time, and stance time are also longer than the HCs'. Such a friendly system provides high potential in tracking long-time patterns for diagnosis.

关键词： Time-Up and Go Test inertial sensor Alzheimer's disease

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Fuzzy control of an anaerobic digestion process

Fuzzy control of an anaerobic digestion process

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International Conference on system Theory, control, and Computing (ICSTCC)

作者： Radu-Emil Precup Claudia-Adina Bojan-Dragos Marian Barbu Sergiu Caraman Department of Automation and Applied Informatics Politehnica University of Timisoara Timisoara Romania Dept. of Automatic Control and Electrical Engineering “Dunarea de Jos” University of Galati Galati Romania

The paper proposes a simple Takagi-Sugeno PI-fuzzy controller for an anaerobic digestion process. A fifth order nonlinear model of the anaerobic digestion process is first presented. A second order linear model of the process is next proposed, and the parameters of the linear model are obtained from an optimization problem solved by a Gravitational Search Algorithm. A PI controller is designed for the linear process model using a frequency domain approach in terms of imposing the phase margin. The Takagi-Sugeno PI-fuzzy controller is designed on the basis of the linear PI controller. The Takagi-Sugeno PI-fuzzy controller is validated by simulation using the nonlinear process model in the fuzzy control system.

关键词： Mathematical model Process control control systems Fuzzy control Takagi-Sugeno model Modeling Biological system modeling

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Fault Line Identification of Single Line to Ground Fault for Non-Effectively Grounded Distribution Networks with Double-Circuit Lines

Fault Line Identification of Single Line to Ground Fault for...

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IEEE Power and Energy Society General Meeting

作者： Bo Jiang Xinzhou Dong Shenxing Shi Bin Wang State Key Lab. Of Control and Simulation of Power System and Generation Equipment Dept. of Electrical Engineering Tsinghua University Beijing 100084 China

ISBN: (纸本)9781467380416

Single Line to Ground (SLG) faults in non-effectively grounded networks are difficult to detect. Immune to neutral point grounding type, load conditions and system operation conditions, traveling-wave based method is an effective fault line identification method. However, due to the strong coupling between the double-circuit lines, the wavefront magnitude of them are the same, and the polarity of them are opposite. Thus, the mal-identification will be resulted under such condition. This paper analyzed the traveling wave characteristics of double-circuit lines, and proposed an improved fault line identification method based on the initial process of zero sequence currents and voltage traveling waves. Tests show that, the proposed method has high effectiveness in fault line identification of double-circuit lines in distribution networks.

关键词： distribution networks double-circuit fault line identification non-effectively grounded traveling wave Double circuit Power grids line down Earth faults traveling waves single line

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