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IEEE EUROCON

作者： Petre-Marian Nicolae Ileana-Diana Nicolae University of Craiova Faculty of Electrical Engineering University of Craiova Faculty of Automation Computer Science and Electronics

ISBN: (纸本)9781467322331

The paper analyzes the potential influence of a rectifier fully controlled with thyristors (RFCT) over some components of a power group with static switching. Problems related to the active power flows in distorting and/or non-symmetric regime are briefly presented. Also there are revealed issues related to the influence of non-linear and/or non-symmetric receivers of active powers over the active powers flows along power non-symmetric components when superior harmonics are considered. One presents a complete system with static excitation from a power group. The supplying is made from the power group's main generator terminals, through a power transformer and a RFCT. The electric quantities were recorded with data acquisition systems (DAS) specially designed and made for this application. Based on the acquired recordings one used an original dedicated software based on Fast Fourier Transform (FFT) that allowed the determination of some power quality parameters and the calculation/displaying of (re)active powers' components for each phase and respectively for the significant harmonics (whose weights are over 1%) at the RFCT's input. Analyzing the results one could conclude that the RFCT behaves like a "power converter" for the harmonic and/or non-symmetric powers. An influence of harmonic and non-symmetric powers over some components of the power group could be noticed as well. Experiments certified that these influences result into the shortening of some components' lifetimes, owing to the power flows along the superior harmonics and non-symmetric powers.

关键词： Active power flow Distorting and/or non-symmetrical regimes RFCT Static excitation system Power quality

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Hardware-based parallel firefly algorithm for embedded applications

Hardware-based parallel firefly algorithm for embedded appli...

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2013 NASA/ESA Conference on Adaptive Hardware and Systems, AHS 2013

作者： Muñoz, Daniel M. Llanos, Carlos H. Dos Santos Coelho, Leandro Ayala-Rincón, Mauricio Electronics Engineering Graduate Program Faculty of Gama University of Brasilia Brasilia DF Brazil Department of Mechanical Engineering Automation and Control Group/GRACO University of Brasilia Brasilia DF Brazil Industrial and Systems Engineering Graduate Program LAS/PPGEPS Pontifical Catholic University of Parana Curitiba Parana Brazil Departments of Computer Science and Mathematics University of Brasilia Brasilia DF Brazil

ISBN: (纸本)9781467363839

The firefly algorithm (FA) is a new population-based metaheuristic bioinspired on the behavior of the flashing characteristics of fireflies. As a population-based algorithm, the FA suffers from large execution times specifically for embedded optimization problems with computational limitations. For reducing execution times we propose a hardware parallel architecture of the FA algorithm that facilitates the implementation in Field Programmable Gate Arrays (FPGAs). In addition, this work proposes the application of the opposition-based learning (OBL) approach to the FA algorithm. The respective hardware implementation (HPOFA) was mapped into a Virtex5 FPGA device and numerical experiments using four well-known benchmark problems demonstrate that the opposition-based approach allows the FA algorithm to improve its functionality, preserving the swarm diversity and avoiding the premature convergence problem. Synthesis results point out that the HPOFA architecture is effectively mapped in hardware and is suitable for embedded applications. © 2013 IEEE.

关键词： Parallel architectures

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Very short term pitch angle optimization in wind turbines: A machine learning approach

Very short term pitch angle optimization in wind turbines: A...

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International Conference on Power engineering, Energy and Electrical Drives, POWERENG

作者： Mehmet Yesilbudak Ersan Kabalci Seref Sagiroglu Ilhami Colak Department of Electronics and Automation Vocational College of Haci Bektas Veli Nevsehir University Nevsehir Turkey Department of Electrical and Electronics Engineering Faculty of Engineering and Architecture Nevsehir University Nevsehir Turkey Department of Computer Engineering Faculty of Engineering Gazi University Ankara Turkey Department of Electrical and Electronics Engineering Faculty of Technology Gazi University Ankara Turkey

This paper proposes a pitch angle forecasting model based on the k-nearest neighbor classification. Air temperature, atmosphere pressure, wind direction, wind speed, rotor speed and wind power parameters were represented as a 6-dimensional attribute tuple in the forecasting model. Euclidean, Manhattan and Minkowski distance metrics for measuring the proximity between training and test tuples, mean absolute, mean absolute percentage, and normalized root mean square error metrics for measuring the forecasting accuracy were embedded into the forecasting model. The k-nearest neighbor classifier with Manhattan distance metric for k=1 achieved MAE, MAPE and NRMSE as 0.001°, 0.245% and 0.324%, respectively as the best forecasting accuracy. However, as the worst forecasting accuracy, MAE, MAPE and NRMSE were achieved as 0.015°, 3.236% and 2.613%, respectively for Minkowski distance metric and k=10.

关键词： Forecasting Measurement Wind turbines Predictive models Wind speed Atmospheric modeling Control systems

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Application of optimization technique for PID controller tuning in position tracking of pneumatic actuator system

Application of optimization technique for PID controller tun...

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International Colloquium on Signal Processing & Its Applications, CSPA

作者： N.H Sunar M.F. Rahmat Z. H. Ismail A. M. Faudzi Sy Najib Sy Salim Sharatul Izah Samsudin Department of Mechatronics and Control Engineering Faculty of Electrical Engineering Universiti Teknologi Malaysia Johor Malaysia Department of Control Instrument and Automation Faculty of Electrical Engineering Universiti Teknikal Malaysia Melaka Melaka Malaysia Department of Industrial Electronics Faculty of Electronics and Computer Engineering Universiti Teknikal Malaysia Melaka Melaka Malaysia

In this paper, two optimization techniques of Particle Swarm Optimization (PSO) and Firefly Algorithm (FA) is used to obtain the optimal PID control parameters. To represent the model of the system, system identification with ARX model structure is developed. The results are determined by analysis the step response characteristic of the system. It was observed that the performances of PID controller with PSO optimized parameters perform well in position tracking of the pneumatic actuator system.

关键词： Tuning Zinc Optimization Signal processing algorithms PD control Pneumatic actuators

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Design and analysis of negative value circuit components in Pspice simulation software

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computer Modelling and New Technologies 2013年第2期17卷 53-59页

作者： Ferikoǧlu, A. Sari, Ya. Köker, R. Sakarya University Technology Faculty Electrical and Electronics Engineering Department 54187 Sakarya Turkey Sakarya University Hendek Vocational High School Electronics and Automation Department Hendek Sakarya Turkey Sakarya University Technical Education Faculty Electronics and Computer Sciences Department 54187 Sakarya Turkey

This paper describes the transaction to generate and measure negative valued resistors, capacitors and inductors in Pspice simulation medium for an educational purpose. Negative circuit components are designed and their defining characteristics are produced. An op-amp based generic circuit is used for obtaining negative components. To extract characteristics, a charge-meter and a flux-meter are designed and utilized, in addition to the conventional meters (markers) in the Pspice environment. The numerical examples verify the relevant background theory and validate the designed meters, namely flux meter and charge meter, in simulation medium. The study of the paper have educational value in making clear the meaning of negative impedance by experimentation in a simulation medium, thus relating theory to practice and also exhibit that ORCAD Pspice is highly visual and effective for both understanding the mathematical theory underlying the circuits and performing measurements of flux and charge which are needed to obtain the characteristics of negative inductors and negative capacitors.

关键词： Operational amplifiers

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Tracking performance and disturbance rejection of pneumatic actuator system

Tracking performance and disturbance rejection of pneumatic ...

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Asian Control Conference

作者： Sy Najib Sy Salim Z. H. Ismail M. F. Rahmat A. A. M. Faudzi N. H. Sunar Sharatul Izah Samsudin Department of Control Instrumentation and Automation Faculty of Electrical Engineering Universiti Teknikal Malaysia Melaka Malaysia Department of Control and Mechatronic Engineering Faculty of Electrical Engineering Universiti Teknologi Malaysia Malaysia Centre for Artificial Intelligence & Robotics (CAIRO) Universiti Teknologi Malaysia Kuala Lumpur Malaysia Department of Industrial Electronics Faculty of Electronics and Computer Engineering Universiti Teknikal Malaysia Melaka Malaysia

This paper investigates several control strategies that potential to perform well in regulating and tracking set point of pneumatic actuator system and able to reject disturbance. The system consists of 5-port proportional valve with the dead-band flow and double rod cylinders that exhibit significant friction. Two control strategies of PID and NPID controllers with four different configurations with and without dead-zone compensators (DZC) are simulated. Three different input signals including step, sinusoidal and random waveforms are used to evaluate the performance of the proposed techniques. The effectiveness of NPID+DZC has been successfully demonstrated and proved through simulation and experimental studies.

关键词： Friction Pneumatic actuators Valves Simulation Pneumatic systems Force

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Intelligent Haptic Robotic Glove for patients diagnosed with cerebrovascular accidents

Intelligent Haptic Robotic Glove for patients diagnosed with...

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International Conference on System Theory, Control, and Computing (ICSTCC)

作者： Nirvana Popescu Dorin Popescu Marian Poboroniuc Cristian Dinu Popescu Computer Science Department University Politehnica of Bucharest Bucharest Romania Faculty of Automation Computers and Electronics University of Craiova Craiova Romania Faculty of Electrical Engineering GH. ASACHI Technical University of Iasi Iaşi Romania Rehabilitation Clinic Hospital of Iasi Iaşi Romania

This paper is based on a research project regarding the design and development of an Intelligent Haptic Robot-Glove (IHRG) for the rehabilitation of the patients that have a diagnosis of a cerebrovascular accident. The IHRG is an exoskeleton that supports the human hand and hand activities by using a control architecture for dexterous grasping and manipulation. This IHRG is a medical device that acts in parallel to a hand in order to compensate some lost function. A novel approach for the development of an exoskeleton assistive hand is considered, a “mechatronic approach” for the integration of the mechanical structure, the sensory, the actuation system and the virtual and control system.

关键词： Robots Thumb Exoskeletons computer architecture Sensors Medical treatment

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Complex Dynamical Behavior of a Two-Stage Colpitts Oscillator with Magnetically Coupled Inductors

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Journal of Chaos 2014年第1期2014卷

作者： V. Kamdoum Tamba H. B. Fotsin J. Kengne F. Kapche Tagne P. K. Talla Department of Physics Laboratory of Electronics and Signal Processing (LETS) Faculty of Science University of Dschang P.O. Box 67 Dschang *** Department of Telecommunication and Network Engineering IUT-Fotso Victor of Bandjoun University of Dschang P.O. Box 134 Bandjoun *** Department of Electrical Engineering Laboratory of Automation and Applied Computer (LAIA) IUT-Fotso Victor of Bandjoun University of Dschang P.O. Box 134 Bandjoun *** Department of Physics Laboratory of Mechanics and Modelling of Physical Systems (L2MPS) Faculty of Science University of Dschang P.O. Box 67 Dschang ***

A five-dimensional (5D) controlled two-stage Colpitts oscillator is introduced and analyzed. This new electronic oscillator is constructed by considering the well-known two-stage Colpitts oscillator with two further elements (coupled inductors and variable resistor). In contrast to current approaches based on piecewise linear (PWL) model, we propose a smooth mathematical model (with exponential nonlinearity) to investigate the dynamics of the oscillator. Several issues, such as the basic dynamical behaviour, bifurcation diagrams, Lyapunov exponents, and frequency spectra of the oscillator, are investigated theoretically and numerically by varying a single control resistor. It is found that the oscillator moves from the state of fixed point motion to chaos via the usual paths of period-doubling and interior crisis routes as the single control resistor is monitored. Furthermore, an experimental study of controlled Colpitts oscillator is carried out. An appropriate electronic circuit is proposed for the investigations of the complex dynamics behaviour of the system. A very good qualitative agreement is obtained between the theoretical/numerical and experimental results.

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Evaluations of different Simultaneous Localization and Mapping (SLAM) algorithms

Evaluations of different Simultaneous Localization and Mappi...

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38th Annual Conference on IEEE Industrial electronics Society, IECON 2012

作者： Tuna, Gurkan Gulez, Kayhan Cagri Gungor, V. Veli Mumcu, T. Trakya University Department of Computer Programming Edirne Turkey Yildiz Technical University Electrical-Electronics Faculty Control and Automation Eng. Dept. Istanbul Turkey Bahcesehir University Faculty of Engineering Department of Computer Engineering Istanbul Turkey

ISBN: (纸本)9781467324212

Simultaneous Localization and Mapping (SLAM) algorithms with multiple autonomous robots have received considerable attention in recent years. In general, SLAM algorithms use odometry information and measurements from exteroceptive sensors of robots. The accuracy of these measurements and the performance of the corresponding SLAM algorithm directly affect the overall success of the system. This paper presents comparative performance evaluations of three Simultaneous Localization and Mapping (SLAM) algorithms using Extended Kalman Filter (EKF), Compressed Extended Kalman Filter (CEKF) and Unscented Kalman Filter (UKF). Specifically, it focuses on their SLAM performances and processing time requirements. To show the effect of CPU power on the processing time of SLAM algorithms, two notebooks and a netbook with different specifications have been used. Comparative simulation results show that processing time requirements are consistent with the computational complexities of SLAM algorithms. The results we obtained are consistent with the CPU power tests of independent organizations and show that higher processing power decreases processing time accordingly. The results also show that CEKF is more suitable for outdoor SLAM applications where there are a lot of natural and artificial features. © 2012 IEEE.

关键词： Extended Kalman filters

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Stable signal separation algorithm for ECG signals

Stable signal separation algorithm for ECG signals

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International Symposium on INnovations in Intelligent SysTems and Applications, INISTA 2012

作者： Ilgin, Fatih Yavuz Celik, Hüsamettin Sevim, Yusuf Department of Electronics and Automation Vocational High School Erzincan University Erzincan Turkey Department of Computer Technologies Tercan Vocational High School Erzincan University Erzincan Turkey Department of Electrical and Electronics Engineering Engineering Faculty Karadeniz Technical University Trabzon Turkey

ISBN: (纸本)9781467314466

Electrocardiogram (ECG) signal has biomedical signs showing the working activity of the heart muscle by human body. Being able to take these biomedical signs from human body is important for diagnosis. Although there are a lot of Independent Component Analysis (ICA) algorithms that separate ECG signals from noises in the literature, separation qualities of them depend on initial conditions. The aim of this study is to find an ICA algorithm giving the stable separation quality for different initial conditions. Experimental results show that Kernel Independent Component Analysis algorithm (KICA) provides more accurate and stable results than the other algorithms. © 2012 IEEE.

关键词： Electrocardiograms

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