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Selecting sensor for on load tap changer contacts degree of wear diagnostics

Selecting sensor for on load tap changer contacts degree of ...

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作者： Cichoń, A. Boruckia, S. Bergerb, P. Faculty of Electrical Engineering Automatic Control and Computer Science Opole University of Technology Prószkowska 76 45-758 Opole Poland TurboCare Poland S.A. Powstańców slĄskich 85 42-701 Lubliniec Poland

Results of scientific research works considering selection of measuring transducer applied for registration of acoustic emission signals generated by on load tap changers are presented in the paper. During the coupling process acoustic emission signals are generated by: the mechanical setup of tap changer, contacts operation, and other phenomena. For most on load tap changers types, the working medium is insulation oil in which the acoustic wave being formed propagates to the steal tank. There exists a possibility to register acoustic emission signals with a piezoelectric transducer attached to the outer tank surface or with a hydrophone immersed in the oil. Acoustic emission signal obtained in such manner contains information which describes operation of the power tap changer and the selector. A comparative analysis of acoustic emission signals generated by on load tap changers working under laboratory conditions, with applied measuring transducers with different transmittances, is presented in the paper. The comparative analysis was performed in order to determine their suitability for on load tap changers technical condition diagnosis. Based on the results achieved, one transducer which allows the registration of acoustic events generated during on load tap changers operation was selected.

关键词： Tanks (containers)

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Development of parallel manipulator sit to stand assistive device for elderly people

Development of parallel manipulator sit to stand assistive d...

引用

2013 IEEE Workshop on Advanced Robotics and Its Social Impacts, ARSO 2013

作者： Salah, Omar Asker, Ahmed Fath El-Bab, Ahmed M. R. Assal, Samy M. F. Ramadan, Ahmed A. Sessa, Salvatore Abo-Ismail, Ahmed Egypt-Japan University of Science and Technology New Borg-El-Arab city Alexandria Egypt Mechanical Engineering Department Faculty of Engineering Assiut University Egypt Department of Production Engineering and Mechanical Design Faculty of Engineering Tanta University Alexandria Egypt Computer and Automatic Control Dept. Faculty of Engineering Tanta University Tanta Egypt Mechatronics and Robotics Dept. Egypt-Japan University of Science and Technology Egypt School of Creative Science and Engineering Waseda University Tokyo 168-8480 Japan

ISBN: (纸本)9781479923694

This paper describes a novel mobility assistive device under development in the Egypt-Japan University of science and Technology (E-JUST). The proposed system can help patients who do not have enough physical strength on the lower limbs during sit to stand due to aging, diseases such as polymyositis and myopathy, and joint replacement surgery complications. It can follow the natural pattern of human motion during sit to stand providing assistance force under the shoulder. The overall device is compact and employees a parallel mechanism which provide more stiffness. Several experiments were carried out in a VICON room to calculate the human motion posture while sit to stand motion in addition estimate the trajectory of the end effector during assisting. computer simulation was built to verify the performance of the proposed system with the reference trajectory. © 2013 IEEE.

关键词： Mechanisms

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Efficient fractal method for texture classification

Efficient fractal method for texture classification

引用

International Conference on Systems and computer science (ICSCS)

作者： Andreea Lavinia Popescu Dan Popescu Radu Tudor Ionescu Nicoleta Angelescu Romeo Cojocaru Faculty of Automatic Control and Computer Science Politehnica University of Bucharest Bucharest Romania Faculty of Mathematics and Computer Science University of Bucharest Bucharest Romania Faculty of Electrical Engineering Valahia University of Targoviste Targoviste Romania

This paper presents an alternative approach to classical box counting algorithm for fractal dimension estimation. Irrelevant data are eliminated from input sequences of the algorithm and a new fractal dimension, called efficient fractal dimension (EFD), which is based on the remaining sequences is calculated. The discriminating capacity and the time efficiency of EFD are evaluated in comparison with fractal dimension (FD) computed by box counting both theoretically and empirically. The results revealed that EFD is better than FD for texture identification and classification.

关键词： Fractals Vectors Accuracy Feature extraction Estimation Correlation

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Estimation of nonstationary harmonic signals and its application to active control of MRI noise

Estimation of nonstationary harmonic signals and its applica...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Maciej Niedźwiecki Michał Meller Yoshinobu Kajikawa Dawid Łukwiński Faculty of Electronics Telecommunications and Computer Science Department of Automatic Control Gdańsk University of Technology Gdansk Poland Department of Electrical and Electronic Engineering Faculty of Engineering Science Kansai University Suita Osaka Japan

A new adaptive comb filtering algorithm, capable of tracking the fundamental frequency and amplitudes of different frequency components of a nonstationary harmonic signal embedded in white measurement noise, is proposed. Frequency tracking characteristics of the new scheme are studied analytically, proving (under Gaussian assumptions and optimal tuning) its statistical efficiency for quasi-linear frequency changes. Laboratory tests show that the proposed algorithm can be successfully used for active control of MRI noise.

关键词： Noise Harmonic analysis Magnetic resonance imaging Adaptation models Signal processing algorithms Estimation Power harmonic filters

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Implementation of an inexpensive EEG headset for the pattern recognition purpose

Implementation of an inexpensive EEG headset for the pattern...

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IEEE International Workshop on Intelligent Data Acquisition and Advanced Computing Systems: Technology and Applications

作者： Aleksandra Kawala-Janik Michal Podpora Mariusz Pelc Pawel Piatek Jerzy Baranowski University of Greenwich School of Computing and Mathematical Sciences London United Kingdom Faculty of Electrical Engineering Automatic Control and Informaics Opole Poland Faculty of Electrical Engineering Automatics Computer Science and Biomedical Engineering Krakow Poland

There are many types of bio-signals with various control application prospects. In this work possible control application domain of electroencephalographic signal obtained from an easily available, inexpensive EEG headset - Emotiv EPOC was presented. This work also involved application of an embedded system platform. That solution caused limits in choosing an appropriate signal processing method, as embedded platforms characterise with a little efficiency and low computing power. Potential implementation of the embedded platform enables to extend the possible future application of the proposed BCI. It also gives more flexibility, as the platform is able to simulate various environments. In this work traditional, statistical methods were neither used nor described.

关键词： Electroencephalography Headphones Signal processing Electrodes Noise measurement Pattern recognition MATLAB

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QUESTOR -- automatic Searching for Reports

QUESTOR -- Automatic Searching for Reports

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International Conference on control Systems and computer science (CSCS)

作者： Andrei Vasilateanu Nicolae Goga Tudor Sutu Marius Nastasescu Alin Moldoveanu Victor Asavei Cristian Taslitchi Faculty of Engineering in Foreign Languages University POLITEHNICA of Bucharest Romania Romania Faculty of Automatic Control and Computer Science University POLITEHNICA of Bucharest Romania Romania Info World Romania Romania

ISBN: (纸本)9781467361408

Vast arrays of reporting are nowadays in use, allowing ever increasing flexibility and control over the displayed results. However, as IT developed and became available to all business domains, the number of reports used by companies started to challenge the possibility of good management. The European funded project Questor aims to create a revolutionary product that will eliminate the complexities inherent in the report management workflow. The motivation of this project is to substitute the time consuming manual search for information in reports with an automatic one. The final purpose is to make querying the report database as simple as addressing a question in natural language. This paper gives an overview over the concept of the Questor project, its software architecture and its preliminary results.

关键词： Servers Ontologies Engines Semantics Databases Natural languages Surgery

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Structured coprime factorizations description of Linear and Time-Invariant networks

Structured coprime factorizations description of Linear and ...

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IEEE Conference on Decision and control

作者： Şerban Săbau Cristian Oară Sean Warnick Ali Jadbabaie Stevens Institute of Technology Hoboken NJ US Faculty of the Automatic Control Dept. University “Politehnica” Bucharest Romania The Faculty of the Computer Science Department Brigham Young University Faculty of the Electrical and Systems Engineering Dept University of Pennsylvannia

In this paper we study state-space realizations of Linear and Time-Invariant (LTI) systems. Motivated by biochemical reaction networks, Gonçalves and Warnick have recently introduced the notion of a Dynamical Structure Functions (DSF), a particular factorization of the system's transfer function matrix that elucidates the interconnection structure in dependencies between manifest variables. We build onto this work by showing an intrinsic connection between a DSF and certain sparse left coprime factorizations. By establishing this link, we provide an interesting systems theoretic interpretation of sparsity patterns of coprime factors. In particular we show how the sparsity of these coprime factors allows for a given LTI system to be implemented as a network of LTI sub-systems. We examine possible applications in distributed control such as the design of a LTI controller that can be implemented over a network with a pre-specified topology.

关键词： Transfer functions Equations Indium phosphide Mathematical model Network topology Topology Electronic mail

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Methodology for identifying quadrotor parameters, attitude estimation and control

Methodology for identifying quadrotor parameters, attitude e...

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IEEE/ASME (AIM) International Conference on Advanced Intelligent Mechatronics

作者： M. Elsamanty A. Khalifa M. Fanni A. Ramadan A. Abo-Ismail Mechatronics and Robotics Engineering Department School of Innovative Design Engineering Egypt-Japan University of Science and Technology Alexandria Egypt Production. Engineering & Mechanical Design Department Faculty of Engineering Mansoura University Mansoura Egypt Computer & Automatic Control Department Faculty of Engineering Tanta University Tanta Egypt

ISBN: (纸本)9781467353199

This paper describes a methodology to identify all the parameters of a quadrotor system including the structure parameters and rotor assembly parameters. A CAD model is developed using SOLIDWORKS to calculate the mass moment of inertia and all the missing geometrical parameters. A three simple test rigs are built and used to identify the relationship between the motor input Pulse Width Modulation (PWM) signal and the angular velocity, the thrust force, and drag moment of the rotors. A simple algorithm is implemented to an inertial measurement unit (IMU) for estimating the attitude and altitude of the quadrotor. Experimental set up is built to verify and test the accuracy of these proposed techniques. A controller is designed based on the feedback linearization method such that the quadrotor attitude can be stabilized. Finally, the experimental results show the effectiveness of the proposed techniques and the controller design.

关键词： Rotors Pulse width modulation Propellers Force Drag Angular velocity Assembly

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Admissible modeling disturbances for the control of a road sector

Admissible modeling disturbances for the control of a road s...

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7th IEEE International Symposium on Applied Computational Intelligence and Informatics, SACI 2012

作者： Dimon, Catalin Popescu, Dumitru Department of Automatic Control and Systems Engineering Faculty of Automatics and Computer Science University Politehnica of Bucharest Bucharest Romania

ISBN: (纸本)9781467310116

Usually when modeling a real process the effects of nonlinearities must be taken into account. A road traffic sector is one such process. Considering it from a macroscopic point of view, the sector is modeled both as a nonlinear and as a linearized process. An I/O model is proposed and a RST control algorithm is used to ensure the imposed performances for the closed loop system. The robustness of the system is obtained by determining the modulus margin and based upon it the admissible nonlinearities are analyzed in order to determine the limits between which the system maintains its stability. ©2012 IEEE.

关键词： Closed loop systems

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A comparison of particle swarm optimization and differential ant stigmergy algorithm

A comparison of particle swarm optimization and differential...

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2012 16th International Conference on System Theory, control and Computing, ICSTCC 2012

作者： Şerbencu, A.E. Şerbencu, A. Control Systems and Electrical Engineering Departament Automatic Computer Science Electrical and Electronic Engineering Faculty Dunarea de Jos University of Galati Romania

ISBN: (纸本)9786068348483

Differential Ant Stigmergy Algorithm (DASA) is a recent meta-heuristic method which represents an adaptation of Ant Colony Optimization (ACO) to continuous optimization problems. Other adaptations of ACO to continuous optimization exist but DASA seems to be very efficient for the class of highdimension real-parameters optimization problems, becoming a competitor to more classical methods such as Particle Swarm Optimization (PSO). The PSO is a meta-heuristic which is also inspired from insects' life as ACO. Even both methods use a population of entities, the memory of PSO is larger as those of DASA. DASA uses just one current solution around which the population search and the difference that generated last improvement. PSO stores the previous best position and velocity of every particle. This paper attempts to examine if an elitist version of DASA has at least the same effectiveness (finding the true global solution) as PSO, but with significantly better efficiency (less function evaluation). The performance comparison of DASA and PSO is implemented using a set of six test functions well known for their difficulty. © 2012 Dunarea de Jos University.

关键词： Ant colony optimization

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