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Estimation of Fatigue Damage for an Austenitic Stainless Steel (SUS304) Using Magnetic Methods

AIP Conference Proceedings 2007年第1期894卷 1290-1297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 3Department of Electrical and Electronic Engineering Faculty of Engineering Oita University 700 Dannoharu Oita 870‐1192 Japan

There are some fatigue damage estimation methods of the austenitic stainless steel that uses the martensitic transformation. For instance, they are the remanent magnetization method, the excitation method, and so on. Those two methods are being researched also in our laboratory now. In the remanent magnetization method, it is well known that the relation between fatigue damage and the remanent magnetization is simple, clear, and reproducible. However, this method has the disadvantage to need a special magnetizer. This method cannot be easily used on the site such as the factory. On the other hand, because the special magnetizer is unnecessary, the excitation method can use easily on the site. The output signal of this method is small. In this paper, two fatigue evaluation methods such as the remanent magnetization method and the excitation method are introduced. In addition, we report on the result of comparing the fatigue evaluation performances of two methods.

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Parameter estimation using biologically inspired methods

Parameter estimation using biologically inspired methods

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IEEE International Conference on Robotics and Biomimetics

作者： Weixing Lin Rong Liu Peter X. Liu Max. Q.-H. Meng Faculty of Information Science and Technology Ningbo University Ningbo China Department of Systems and Computer Engineering Carleton University Ottawa ONT Canada Department of Biomedical Engineering Dalian University of Technology Dalian China Department of Electronic Engineering Chinese University of Hong Kong Hong Kong China

ISBN: (纸本)9781424417612

Identification of nonlinear systems has drawn much attention in recent years. This paper presents a new identification algorithm for Hammerstein models based on bacterial foraging. In specific, the biomimicry of the bacterial chemotaxis algorithm is used to identify model parameters. A flowchart of this identification algorithm is given. Simulation and Comparison studies show that the proposed bacterial foraging based approach outperforms the particle swarm optimization in terms of both convergence and precision.

关键词： Parameter estimation Microorganisms Biomedical engineering Nonlinear systems Particle swarm optimization Ant colony optimization Biomimetics Optimization methods System identification Robots

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Stability of the Line-Start Permanent Magnet Synchronous Motor Sensorless Drive

Stability of the Line-Start Permanent Magnet Synchronous Mot...

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AFRICON Conference

作者： D. Stoia D. Ilea M. Cernat Al.B. Dezsi A. Jimoh Faculty of Electrical Engineering and Computer Science Blvd. Transilvania University of Brasov Brasov Romania CD Electric Limited Brasov Romania Graduate School of Electrical and Electronic Engineering Tshwane University of Technology TUT Pretoria South Africa

An analysis and experimental verification of the operating point stability of the line-start permanent synchronous machine (LSPMSM) supplied from a current source provided with power factor control is presented. The control system acts to inject the stator currents at a controlled angle related to the stator voltages. The machine parameters are varying because of magnetic saturation and as a result the control performances are affected by saturation. The effects of magnetic saturation and inverter imperfections are included.

关键词： Permanent magnet motors Sensorless control Voltage control Control systems Stators Saturation magnetization Magnetic analysis Stability analysis Synchronous machines Current supplies

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Self-tuning Regulator for Order-varying Systems Based on Particle Swarm Optimization

Self-tuning Regulator for Order-varying Systems Based on Par...

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IEEE International Conference on Mechatronics and Automation

作者： Weixing Lin Chao Ou Peter X. Liu Max Q.-H. Meng Faculty of Information Science and Technology Ningbo University Ningbo Zhejiang China Department of Systems and Computer Engineering Carleton University Ottawa ONT Canada Department of Electronic Engineering Chinese University of Hong Kong New Territories Hong Kong China

A novel design method of the self-tuning control algorithm is introduced for order-varying systems. In specific, the self-tuning regulator is optimized by the particle swarm optimization algorithm. The system error can be tracked by an implicit identification fashion in order to increase precision and decrease computation time. This method is suitable for typical industrial process control, especially for order-varying and large-time-delay systems. Simulations and comparisons show its advantages over traditional methods which are based on least-squares algorithms in terms of robustness and tracing precision.

关键词： Adaptive control Particle swarm optimization Control systems Resonance light scattering Artificial intelligence Electrical equipment industry Robustness Delay effects Colored noise Testing

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World-wide lightning location using VLF propagation in the earth-ionosphere waveguide

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URSI Radio Science Bulletin 2008年第327期2008卷 39-53页

作者： Richard L. Dowden James B. Brundell Robert H. Holzworth Abram R. Jacobson Erin Lay Craig J. Rodger Neil R. Thomson Jádnos Lichtenberger Thomas J. Lyons Steven O'Keefe Zen Kawasaki Colin Price Victor Prior Pascal Ortéga James Weinman Yuri Mikhailov Oscar Veliz Xiushu Qie Gary Burns Andrew Collier Osmar Pinto Ricardo Diaz Claudia Adamo Earle R. Williams Sushil Kumar G. B. Raga Jose M. Rosado Eldo E. Avila Mark A. Clilverd Thomas Ulich Peter Gorham Thomas J. G. Shanahan Thomas Osipowicz Gregory Cook Yang Zhao Low Frequency Electromagnetic Research Ltd. 161 Pine Hill Road Dunedin 9010 NZ Dept of Earth and Space Sciences University of Washington Box 351310 Seattle WA 98195-1310 USA Physics Department University of Otago PO Box 56 Dunedin NZ Eötvös Lorand University Space Research Group Pazmany Peter s. I./A. H-1117 Budapest Hungary Environmental Science Murdoch University Murdoch WA 6150 Australia School of Engineering Griffith University Nathan QLD 4111 Australia Department of Electrical Electronics and Information Engineering Faculty of Engineering Osaka University Yamada-Oaka2-1 Suita Osaka 565-0871 Japan Department of Geophysics & Planetary Sciences Tel Aviv University Ramat Aviv 69978 Israel Instituto de Meteorologia Rua Cao Aeroporto 1749-077 Lisboa Portugal University of French Polynesia BP 6570 98 702 Faaa Centre French Polynesia ATG Building University of Washington Box 351640 Seattle WA 98195-1640 USA IZMIRAN Troitsk Moscow Region 142190 Russia Institute Geofsico del Peru Calle Badajoz No. 169 Urb. Mayorazgo IV Etapa Ate Vitarte Lima 03 Peru Lab. for Middle Atmosphere and Global Environment Observation (LAGEO) Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China (CIE) Ice Ocean Atmosphere & Climate Australian Antarctic Division 203 Channel Highway Kingston Tasmania 7050 Australia Hermanus Magnetic Observatory PO Box 32 Hermanus 7200 South Africa Chefe do Grupo de Eletricidade Atmosférica (ELAT) DGE/INPE Av. Astronautas 1758 S.J. Campos SP 12240-540 Brazil Laboratorio Alta Tension Universidad Nacional Tucuman Av. Independencia 1800-(4000) S.M. de Tucuman Argentina Institute of Atmospheric Sciences and Climate ISAC-CNR Area di Ricerca di Tor Vergata Via del Fosso del Cavaliere 100 00133 Roma Italy Massachusetts Institute of Technology Parsons Lab Rm. 48-319 Cambridge MA 02139-4307 USA Physics Department University of the South Pacific Suva Fiji Centro de Ciencias de la Atmosfera Universidad Nacio

Worldwide lightning location (WWLL) using only 30 lightning sensors has been successfully achieved by using only VLF propagation in the Earth-ionosphere waveguide (EIWG). Ground propagation or mixed “sky” and ground propagation is avoided by requiring evidence of Earth-ionosphere waveguide dispersion. A further requirement is that the lightning strike must be inside the perimeter defined by the lightning sensor sites detecting the stroke. Under these conditions, the time and the location of the stroke can be determined, along with the rms errors. Lightning strokes with errors exceeding 30 ps or 10 km are rejected. To assist with identifying impulses from the same lightning stroke, the lightning sensor threshold is automatically adjusted to allow an average detection rate of three per second. This largely limits detection to the strongest 4% of all lightning strokes, of which about 40% meet the accuracy requirements for time and location.

关键词： Lightning electronic mail Electric fields Antennas Sensors Buildings Australia

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Linguistic Fuzzy Modelling of An Asynchronous Motor

Linguistic Fuzzy Modelling of An Asynchronous Motor

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2007 International Aegean Conference on Electrical Machines and Power electronics, vol.2

作者： L. Barazane A. Khwaldeh M. Jumah R. Ouiguini Faculty of Electronic & Computing University of Science and Technology of Houari Boumedienne Algiers Algeria Depatrment of Computer Science Faculty of Engineering Philadelphia University Jordan Centre de Developpement et des Technologies Avancées Haouch Oukil Laboratoire de Robotique et d'Intelligence Artificielle Algiers Algeria

Sliding mode control and fuzzy logic control have been combined together in order to optimize the performance given by conventional sliding mode control;especially against the effect causes by the chattering phenomenon. One approach taken by many researchers is to use fuzzy logic to smooth the chattering in sliding mode control. In this paper, a novel direction to design the fuzzy sliding controllers is proposed. In fact, the control design is based on the fuzzy model of an induction motor using the approach of Ben-Ghalia. The aim of the proposed modelling approach is to provide a fuzzy set based representation of the cascade sliding mode control of an induction motor fed by PWM voltage source inverter, which operates in a fixed reference frame. For this purpose, a new decoupled and reduced model is first proposed. Then, a set of simple surfaces and associated control laws are synthesised. A piecewise smooth control function with a threshold is adopted. However, the magnitude of this function depends closely on the upper bound of uncertainties, which include parameter variations and external disturbances. This bound is difficult to obtain prior to motor operation. To solve this problem, a fuzzy modelling approach is presented to improve the design and tuning of a fuzzy logic controller using variable structure control theory. The fuzzy controller, is designed in order to improve the control performances and to reduce the control energy and the chattering phenomenon. Simulation results reveal some very interesting features.

关键词： Feedback linearization control Sliding mode control Induction motor Cascade structure Fuzzy modelling control Fuzzy sliding mode control

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Extensional methods and application in the robot navigation

Extensional methods and application in the robot navigation

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1st International Symposium on Systems and Control in Aerospace and Astronautics

作者： Jieqiong, Han Bi, Zeng Guangchang, Liu Zengyuan, Bian Faculty of Computer Department Guangdong University of Technology Guangzhou CO 510090 China Faculty of Electronic Engineering Department Jinan University Guangzhou CO 510632 China

The purpose of this paper mainly introduces the concepts of Extension Transformation, which could change the incompatible problems into compatible problems. On the basis of experiments, this paper shows the achievemen... 详细信息

ISBN: (纸本)0780393953

关键词： Navigation systems

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A subregion expansion method for computational electromagnetics

A subregion expansion method for computational electromagnet...

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INTERMAG 2006 - IEEE International Magnetics Conference

作者： Chen, D. Shao, K. Hu, X. Guo, Y. Lavers, J. College of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan Hubei Province China Faculty of Engineering University of Technology Sydney NSW Australia Department of Electrical and Computer Engineering University of Toronto Toronto ON Canada

No abstract available

ISBN: (纸本)1424414792

No abstract available

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Modeling of random access channel for limited user network

Modeling of random access channel for limited user network

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2006 IFIP International Conference on Wireless and Optical Communications Networks

作者： Karim, Md. Shahriar Islam, Md. Imdadul Hossain, A.B.M. Siddique Motorola Inc. Bangladesh Branch Office Dhaka Bangladesh Faculty Dept. of Computer Science and Engineering Jahangirnagar University Savar Bangladesh IEEE Bangladesh Dept. of Electrical and Electronic Engineering Bangladesh University of Engineering and Technology Dhaka Bangladesh

ISBN: (纸本)1424403405

ALOHA based random multiple access schemes have been in use for some time as access control protocol in mobile network. In pure and slotted ALOHA system random access technique is modeled considering Poisson's arrival traffic. In case of small network, users and also the coverage area are limited. Hence limited users traffic model is pertinent for such network. In the paper performance parameters of a limited user network have been exclusively studied. This paper will depict an analysis of probability of successful capture of packet, blocking probability and throughput for a limited source random access channel network. © 2006 IEEE.

关键词： Channel capacity

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Time-significant wavelet coherence for the evaluation of schizophrenic brain activity using a graph theory approach

Time-significant wavelet coherence for the evaluation of sch...

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28th Annual International Conference of the IEEE engineering in Medicine and Biology Society, EMBS'06

作者： Sakkalis, Vangelis Oikonomou, Theofanis Pachou, Ellie Tollis, Ioannis Micheloyannis, Sifis Zervakis, Michalis IEEE Department of Electronic and Computer Engineering Technical University of Crete Chania 73100 Greece Institute of Computer Science Foundation for Research and Technology Heraklion 71110 Greece Institute of Computer Science Foundation for Research and Technology Heraklion Greece Department of Computer Science University of Crete Heraklion 71409 Greece Faculty of Medicine University of Crete Heraklton 71409 Greece

ISBN: (纸本)1424400325

Among the various frameworks in which Eleetroencephalographic (EEG) signal synchronization has been traditionally formulated, the most widely studied and used is the coherence that is entirely based on frequency analysis. However, at present time it is possible to capture information about the temporal profile of coherence, which is particularly helpful in studying non-stationary time-varying brain dynamics, like the Wavelet Coherence (WC). In this paper we propose a new approach of studying brain synchronization dynamics by extending the use of WC to include certain statistically significant (in terms of signal coherence) time segments, to study and characterize any disturbances present in the functional connectivity network of schizophrenia patients. Graph theoretical measures and visualization provide the tools to study the "disconnection syndrome" as proposed for schizophrenia. Specifically, we analyzed multichannel EEG data from twenty stabilized patients with schizophrenia and controls in an experiment of working memory (WM) using the gamma band (i.e., the EEG frequency of ca. 40 Hz), which is activated during the connecting activity (i.e., the "binding" of the neurons). The results are in accordance with the disturbance of connections between the neurons giving additional information related to the localization of most prominent disconnection. © 2006 IEEE.

关键词： Wavelet transforms

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