CEE

Volume 11, number 1, 2017

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Carpathian Journal of Electrical Engineering

Volume 11, Number 1 / 2017

Published papers:


Fuzzy Logic Based Automatic Door Control System

  • Harun SUMBUL, Yesilyurt D. C. Vocational School, Ondokuz Mayis University, Samsun, Turkey, Această adresă de e-mail este protejată de spamboţi; aveţi nevoie de activarea JavaScript-ului pentru a o vizualiza
  • Keywords: automatic door, fuzzy logic, rule base, control system
  • Abstract: In this paper, fuzzy logic based an automatic door control system is designed to provide for heat energy savings. The heat energy loss usually occurs in where outomotic doors are used. Designed fuzzy logic system’s Input statuses (WS: Walking Speed and DD: Distance Door) and the output status (DOS: Door Opening Speed) is determined. According to these cases, rule base (25 rules) is created; the rules are processed by a fuzzy logic and by appyled to control of an automatic door. An interface program is prepared by using Matlab Graphical User Interface (GUI) programming language and some sample results are checked on Matlab using fuzzy logic toolbox. Designed fuzzy logic controller is tested at different speed cases and the results are plotted. As a result; in this study, we have obtained very good results in control of an automatic door with fuzzy logic. The results of analyses have indicated that the controls performed with fuzzy logic provided heat energy savings, less heat energy loss and reliable, consistent controls and that are feasible to in real.

Image Steganograpfhy Tailored to Objects Contours

  • Ovidiu COSMA, Technical University of Cluj-Napoca, Această adresă de e-mail este protejată de spamboţi; aveţi nevoie de activarea JavaScript-ului pentru a o vizualiza
  • Keywords: image steganography, LSB substitution
  • Abstract: This article proposes a steganography method that uses all three components of an image in the RGB color space to store secret data. The order in which the image pixels are processed is not given by their position within the image, but by their visual significance. In order to ensure the greatest possible embedding capacity, the image container is traversed in several passes, each expanding its capacity.

Structural Monitoring of Wind Turbines using Sensors Connected via UTP Cable

  • Dumitru SPERMEZAN, Mircea I. BUZDUGAN, Horia BALAN, Technical University of Cluj-Napoca, Această adresă de e-mail este protejată de spamboţi; aveţi nevoie de activarea JavaScript-ului pentru a o vizualiza
  • Keywords: vibrometer, vibrations monitoring, piezoelectric transducer, acquisition board
  • Abstract: Unpredicted faults that may occur at the wind generators elements affect their economic operation. A promising approach that avoids these faults is the real-time vibrations monitoring. Data measured by the sensors can be transmitted to a monitoring station using wireless techniques, or optical fiber, or UTP cable. The last possibility is the cheapest, but it permits connecting the monitoring station at a limited distance with respect to the monitored turbine. The paper presents the components of the monitoring system and the experimental results related to the monitored wind turbine.

A Method for Denoising Image Contours

  • Ovidiu COSMA, Technical University of Cluj-Napoca, Această adresă de e-mail este protejată de spamboţi; aveţi nevoie de activarea JavaScript-ului pentru a o vizualiza
  • Keywords: edge detection, noise removal
  • Abstract: The edge detection techniques have to compromise between sensitivity and noise. In order for the main contours to be uninterrupted, the level of sensitivity has to be raised, which however has the negative effect of producing a multitude of insignificant contours (noise). This article proposes a method of removing this noise, which acts directly on the binary representation of the image contours.

Testing Solutions of the Protection Systems Provided with Delay Maximum Current Relays

  • Horia BALAN, Mircea I. BUZDUGAN, Ionut IANCAU, Liviu NEAMT, Technical University of Cluj-Napoca,  Această adresă de e-mail este protejată de spamboţi; aveţi nevoie de activarea JavaScript-ului pentru a o vizualiza
  • Keywords: power system protection, current relays
  • Abstract: Relay protection is one of the main forms of automation control of electro energy systems, having as primary aims fault detection and disconnection of the faulty element in order to avoid the extent of damages and the as fast as possible recovery to the normal operation regime for the rest of the system. Faults that occur in the electro energy system can be classified considering on one hand their causes and on the other their types, but in the vast majority of cases the causes of the faults are combined. Further, considering their nature, faults are classified in faults due to the insulation’s damage, in faults due to the destruction of the integrity of the circuits and faults determined by interruptions. With respect to their nature, faults are short circuits, earthing faults and phases interruptions. At the same time, considering their type, faults are divided in transversal and longitudinal ones. The paper presents a testing solution of the delayed maximal current relays using a T3000 ISA Test measuring equipment.


Decline of Active Power Loss by Improved Moth-Flame Optimization Algorithm

  • Lenin KANAGASABAIPrasad V. Potluri Siddhartha Institute of Technology, Kanuru, Vijayawada, Andhra Pradesh, India,  Această adresă de e-mail este protejată de spamboţi; aveţi nevoie de activarea JavaScript-ului pentru a o vizualiza
  • Keywords: Improved moth-flame optimization, Levy flight, optimal reactive power, transmission loss
  • Abstract: In this paper, Improved Moth-Flame Optimization (IMFO) algorithm has been proposed for solving Reactive power problem. Navigation method of moths in nature called transverse orientation is the key inspiration of the moth-flame algorithm (MFO). By maintaining a fixed angle with respect to the moon, Moths fly in the night and it’s an effective mechanism for moths travelling in a straight line for long distances. Due to very slow convergence and poor precision, an improved version of MFO algorithm based on Levy-flight strategy has been proposed to solve the reactive power problem. The diversity of the population can be increased by Levy-flight to overcome premature convergence in order to reach the global optimal solution. This methodology improves the trade-off between exploration and exploitation ability of moth-flame algorithm (MFO).The proposed Improved Moth-Flame Optimization (IMFO) algorithm has been tested in standard IEEE 30,57,118 bus test systems and simulation results show clearly about the better performance of the proposed algorithm in reducing the real power loss with control variables within the limits.


Biot-Savart Law Application in Wireless Power Transfer – Dependence of Magnetic Field to Angle Position

  • Bogdan IUGA, Radu-Adrian TIRNOVAN, Technical University of Cluj-Napoca,  Această adresă de e-mail este protejată de spamboţi; aveţi nevoie de activarea JavaScript-ului pentru a o vizualiza
  • Keywords: Biot-Savart law, exterior magnetic field, closed loop
  • Abstract: The magnetic field of a closed loop of conductive wire can be computed due to Biot-Savart law, which analyses the value of the field at an exterior point from the transversal axis. If the measure point is out of the axis then the magnetic field has completely different values. A general stated form of this law can measure the value in any point, in relation to Euclidian distance from the loop.


 
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