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23,598 Article Results

Implementation of Fuzzy Logic controller in Photovoltaic Power generation using Boost Converter and Boost Inverter

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4903
Abubakkar Siddik A , Shangeetha M
Increasing in power demand and shortage of conventional energy sources, researchers are focused on renewable energy. The proposed solar power generation circuit consists of solar array, boost converter and boost inverter. Low voltage, of photovoltaic array, is boosted using dc-dc boost converter to charge the battery and boost inverter convert this battery voltage to high quality sinusoidal ac voltage. The output of solar power fed from boost inverter feed to autonomous load without any intermediate conversion stage and a filter. For boost converter operation duty cycle is varied through fuzzy logic controller and PWM block to regulate the converter output voltage. The ac voltage total harmonic distortion (THD) obtained using this configuration is quite acceptable. The proposed power generation system has several desirable features such as low cost and compact size as number of switches used, are limited to four as against six switches used in classical two-stage inverters.DOI: http://dx.doi.org/10.11591/ijpeds.v2i3.334
Volume: 2
Issue: 3
Page: 249-256
Publish at: 2012-09-01

Plant Watering Autonomous Mobile Robot

https://ijra.iaescore.com/index.php/IJRA/article/view/901
Hema Nagaraja , Reema Aswani , Monisha Malik
Now days, due to busy routine life, people forget to water their plants. In this paper, we present a completely autonomous and a cost-effective system for watering indoor potted plants placed on an even surface. The system comprises of a mobile robot and a temperature-humidity sensing module. The system is fully adaptive to any environment and takes into account the watering needs of the plants using the temperature-humidity sensing module. The paper describes the hardware architecture of the fully automated watering system, which uses wireless communication to communicate between the mobile robot and the sensing module. This gardening robot is completely portable and is equipped with a Radio Frequency Identification (RFID) module, a microcontroller, an on-board water reservoir and an attached water pump. It is capable of sensing the watering needs of the plants, locating them and finally watering them autonomously without any human intervention. Mobilization of the robot to the potted plant is achieved by using a predefined path. For identification, an RFID tag is attached to each potted plant. The paper also discusses the detailed implementation of the system supported with complete circuitry. Finally, the paper concludes with system performance including the analysis of the water carrying capacity and time requirements to water a set of plants.DOI: http://dx.doi.org/10.11591/ijra.v1i3.1305
Volume: 1
Issue: 3
Page: 152-162
Publish at: 2012-09-01

Improved Line Tracking System for Autonomous Navigation of High-Speed Vehicle

https://ijra.iaescore.com/index.php/IJRA/article/view/902
Yahya Zare Khafri , Ali Jahanian
Line tracking navigation is one of the most widely techniques used in the robot navigation. In this paper, a customized line tracking system is proposed for autonomous navigation of high speed vehicles. In the presented system, auxiliary information -in addition to the road path- is added to the tracking lines such as locations of turn and intersections in the real roads. Moreover, the geometric position of line sensors is re-designed enables the high rate sensing with higher reliability. Finally, a light-weight navigation algorithm is proposed allow the high-speed movement using a reasonable processing power. This system is implemented on a MIPS-based embedded processor and experimental results with this embedded system show more than 98% accuracy at 200km/h with a 1GHz processor is viable.DOI: http://dx.doi.org/10.11591/ijra.v1i3.766
Volume: 1
Issue: 3
Page: 163-174
Publish at: 2012-09-01

Modelling and Controller Design of Electro-Pneumatic Actuator Based on PWM

https://ijra.iaescore.com/index.php/IJRA/article/view/898
Behrouz Najjari , S. Masoud Barakati , Ali Mohammadi , Mohammad Javad Fotuhi , Saeid Farahat , Mohammad Bostanian
In this paper, a nonlinear model associated to the fast switching on-off solenoid valve and pneumatic cylinder was dynamically presented. Furthermore, an investigation into the electrical, magnetic, mechanical and fluid subsystems are made. Twocommon control policies to track valve position, a Proportional Integrator (PI) based on Pulse Width Modulation (PWM) and hysteresis controllers, are investigated. To control cylinder position, a Programmable Logic Controller (PLC) on a simulated unit and an experimental setup regulated with AVR microcontroller are carried out. Experimental results show effective validation to the simulation results from PLC. DOI: http://dx.doi.org/10.11591/ijra.v1i3.565
Volume: 1
Issue: 3
Page: 125-136
Publish at: 2012-09-01

Indoor Robot Localisation with Active RFID

https://ijra.iaescore.com/index.php/IJRA/article/view/899
Wei Wei , Kevin Curran
Radio Frequency Identification (RFID) is a technology of location determination and data capture. An RFID based system relies on the interaction between readers (also known as interrogator) and tags (transponders). Active RFID technology is suitable for tracking costly assets or moving objects such as mobile robots. Once affixed with RFID tags, a robot can be localised. However, there is a tendency for accuracy to vary greatly as well as delay in readings. Those problems may be enlarged in real time applications. This paper provides an overview of implementing RFID in precision tracking of mobile robots.DOI: http://dx.doi.org/10.11591/ijra.v1i3.487
Volume: 1
Issue: 3
Page: 137-144
Publish at: 2012-09-01

Kinematic Analysis of 3-DOF Planer Robot Using Artificial Neural Network

https://ijra.iaescore.com/index.php/IJRA/article/view/900
Jolly Atit Shah , S.S. Rattan , Bahadur Chand Nakra
Automatic control of the robotic manipulator involves study of kinematics and dynamics as a major issue. This paper involves the forward and inverse kinematics of 3-DOF robotic manipulator with revolute joints. In this study the Denavit- Hartenberg (D-H) model is used to model robot links and joints. Also forward and inverse kinematics solution has been achieved using Artificial Neural Networks for 3-DOF robotic manipulator. It shows that by using artificial neural network the solution we get is faster, acceptable and has zero error.DOI: http://dx.doi.org/10.11591/ijra.v1i3.511
Volume: 1
Issue: 3
Page: 145-151
Publish at: 2012-09-01

Ventilation Structure Improvement of Air-cooled Induction Motor Using Multiphysics Simulations

10.12928/telkomnika.v10i3.823
Yujiao; China Three Gorges University Zhang , Xiongfeng; China Three Gorges University Huang , Tao; Wuhan University Huang , Jiangjun; Wuhan University Ruan , Xiaowen Wu; Wuhan University Xiaowen Wu
 Optimal design of large induction motor is a process that involves electrical and mechanical skills as well as thermal and fluid dynamic skills. For recent machine layouts, one cannot rely on standard analysis methods. In multiphysics simulations which are done by weak coupling finite-element method, rotation boundary values on interface between air gap and rotor cannot be applied directly for fluid-dynamical analysis. A novel multi-component fluid method is proposed to deal with the influence of rotor rotation upon the air convection. This paper investigates a 3-D multi-physics simulation used in simulation of temperature distribution in air-cooled induction motor. The temperature rise in motor is due to Joule’s losses in stator windings and the induced eddy current in squirrel cages, and heat dissipation by air convection and solid conduction. The Joule’s losses calculated by 3-D eddy-current field analysis are used as the input for the thermal field analysis, which deeply depends on accurate air fluid field analysis. Through the coupled-field calculation, we proposed a new ventilation structure of a 15-phase motor to improve the cooling performance.
Volume: 10
Issue: 3
Page: 451-458
Publish at: 2012-09-01

Project Evaluation Method Based on Matter-Element and Hierarchy Model

10.12928/telkomnika.v10i3.841
Haifeng Li; Dalian University of Technology, Dalian Jiaotong University Haifeng Li
Project evaluation is always the key link of the engineering project management. Project evaluation is a complex work which involves many factors. The final evaluation result is always influenced directly by the definition of various evaluation indexes and the corresponding weight. Mainly study the judgment of the experts’ ability and the establishment of the project evaluation index system in the peer communication review, analyze deeply the engineering project review work, build a evaluation index system for the engineering project, and put forward a comprehensive evaluation method based on the matter-element and hierarchy model in the engineering project, at last, apply it in the actual project which proves the practicability of the paper’s theory.
Volume: 10
Issue: 3
Page: 586-591
Publish at: 2012-09-01

A Miniaturized In Situ Tensile Platform under Microscope

10.12928/telkomnika.v10i3.832
Zhichao Ma; Jilin University Zhichao Ma , Hongwei; Jilin University Zhao , Hu Huang; Jilin University Hu Huang , Kaiting; Jilin University Wang , Qinchao Li; Jilin University Qinchao Li , Xiaoqin; Jilin University Zhou , Xiaoli Hu; Jilin University Xiaoli Hu
Aiming at the mechanical testing of three-dimensional specimens with feature size of centimeter level, a miniaturized tensile platform, which presents compatibility with scanning electron microscope (SEM) and metallographic microscope, was designed and built. The platform could accurately evaluate the parameters such as elastic modulus, elongation and yield limit, etc. The calibration experiments of load sensor and displacement sensor showed the two kinds of sensors had high linearity. Testing of transmission error and modal parameters showed that the platform presented good following behaviors and separation of resonance region. Comparison tests based on stress-strain curve were carried out between the self-made platform and the commercial tensile instrument (Instron) to verify the feasibility of the platform. Furthermore, the in situ tensile experiment under metallographic microscope was carried out on a kind of manganese steel.
Volume: 10
Issue: 3
Page: 524-530
Publish at: 2012-09-01

Numerical Simulation of Chip Formation in Metal Cutting Process

10.12928/telkomnika.v10i3.827
Zhao; North University of China Yongjuan , Pan Yutian; North University of China Pan Yutian , Huang; North University of China Meixia
In order to study the chip formation mechanism in metal cutting process, based on finite element software ABAQUS, the paper established finite element model and carried out numerical simulation on serrated chip formation of Ni-base superalloy GH4169 and ribbon chip formation of 45# steel respectively. In addition, this paper also analyzed the influence law of three factors (cutting speed, feed rate, back cutting depth) on cutting force and the distribution rule of cutting heat in serrated chip formation of GH4169.
Volume: 10
Issue: 3
Page: 486-492
Publish at: 2012-09-01

A New Technology of Remote Sensing Image Fusion

10.12928/telkomnika.v10i3.836
Wei; Beifang University for Nationalities Feng , Wenxing; Beifang University for Nationalities Bao
Wavelet packet transform stands out in the field of image fusion for its good frequency characteristics, and pulse coupled neural network (PCNN) has a unique advantage in image processing. To resolve the problem of multi-spectral remote sensing image fusion, in this paper, we put forward an algorithm combined the wavelet packet and PCNN based on HIS transform.The algorithm will be carried out as follows. Firstly, the TM images will be converted into HIS space, and then the luminance component and the high-resolution image will be broken into multi-scale by wavelet packet. Secondly, according to the frequency domain characteristics of the wavelet packet decomposition, we respectively use a method of weighted average in the low-frequency domain and a method of PCNN in the high frequency domain to select reconstruction coefficient.We can get a fused luminance component by taking inverse wavelet packet transform to be reconstructed. Finally, we can obtain the fusion image by taking inverse HIS transform. The experimental results show that the algorithm can be not only to retain the spectral information, but also greatly improve the spatial resolution of multispectral images, has a good fusion effect
Volume: 10
Issue: 3
Page: 551-556
Publish at: 2012-09-01

Architecture and Fault Identification of Wide-area Protection System

10.12928/telkomnika.v10i3.822
Zhenxing Li; University of Science & Technology Zhenxing Li , Xianggen Yin; University of Science & Technology Xianggen Yin , Zhe Zhang; University of Science & Technology Zhe Zhang , Yuxue; University of Science & Technology Wang
Wide-area protection system (WAPS) is widely studied for the purpose of improving the performance of conventional backup protection. In this paper, the system architecture of WAPS is proposed and its key technologies are discussed in view of engineering projects. So a mixed structure-centralized-distributed structure which is more suitable for WAPS in limited power grid region, is obtained based on the advantages of the centralized structure and distributed structure. Furthermore, regional distance protection algorithm was taken as an example to illustrate the functions of the constituent units. Faulted components can be detected based on multi-source imformation fuse in the algorithm. And the algorithm cannot only improved the selectivity, the rapidity, and the reliability of relaying protection but also has high fault tolerant capability. A simulation of 220 kV grid systems in Easter Hubei province showed the effectiveness of the wide-area protection system presented by this paper.
Volume: 10
Issue: 3
Page: 442-450
Publish at: 2012-09-01

Nonlinear Model Predictive Controller Design for Identified Nonlinear Parameter Varying Model

10.12928/telkomnika.v10i3.831
Jiangang Lu; Zhejiang University Jiangang Lu , Jie You; Zhejiang University Jie You , Qinmin; Zhejiang University Yang
In this paper, a novel nonlinear model predictive controller (MPC) is proposed based on an identified nonlinear parameter varying (NPV) model. First, an NPV model scheme is present for process identification, which is featured by its nonlinear hybrid Hammerstein model structure and varying model parameters. The hybrid Hammerstein model combines a normalized static artificial neural network with a linear transfer function to identify general nonlinear systems at each fixed working point. Meanwhile, a model interpolating philosophy is utilized to obtain the global model across the whole operation domain. The NPV model considers both the nonlinearity of transition dynamics due to the variation of the working-point and the nonlinear mapping from the input to the output at fixed working points. Moreover, under the new NPV framework, the control action is computed via a multistep linearization method aimed for nonlinear optimization problems. In the proposed scheme, only low cost tests are needed for system identification and the controller can achieve better output performance than MPC methods based on linear parameter varying (LPV) models. Numerical examples validate the effectiveness of the proposed approach.
Volume: 10
Issue: 3
Page: 514-523
Publish at: 2012-09-01

A Model to Investigate Performance of Orthogonal Frequency Code Division Multiplexing

10.12928/telkomnika.v10i3.840
Nasaruddin; Syiah Kuala University Nasaruddin , Melinda; Syiah Kuala University Melinda , Ellsa Fitria; Syiah Kuala University Sari
Orthogonal Frequency Code Division Multiplexing (OFCDM) is an attractive multiple access scheme for high data rate application in fourth-generation (4G) wireless communication system. Several previous researches were mainly investigated the performance of OFCDM based on variable spreading factor and subcarrier allocation. However, there are also several system parameters may affected the performance of OFCDM. For that purpose, this paper developes a model to investigate the impact of several parameters on the performance system of OFCDM over Rayleigh Fading channel as a realistic channel in wireless communication system.The proposed model is then created in the form of computer simulation using MATLAB programming in order to show the impact of several parameters for OFCDM’s performance including number of carriers, size of symbol, symbol rate, bit rate, size of guard interval and spreading factor. The simulation results show that the higher number of carriers, larger size of symbol, higher symbol rate, higher bit rate and larger spreading factor are giving the better system’s performance in terms of Bit Error Rate (BER). However, the larger guard interval is giving the worst system’s performance.So all the parameters should be considered in the implementation of OFCDM for the 4G wireless communication system.
Volume: 10
Issue: 3
Page: 579-585
Publish at: 2012-09-01

Numerical Simulation of Tunneling Current in an Anisotropic Metal-Oxide-Semiconductor Capacitor

10.12928/telkomnika.v10i3.826
Fatimah A.; Institut Teknologi Bandung Noor , Ferry; Institut Teknologi Bandung Iskandar , Mikrajuddin; Institut Teknologi Bandung Abdullah , Khairurrijal; Institut Teknologi Bandung Khairurrijal
In this paper, we have developed a model of the tunneling current through a high- dielectric stack in MOS capacitors with anisotropic masses. The transmittance was numerically calculated by employing a transfer matrix method and including longitudinal-transverse kinetic energy coupling which is represented by an electron phase velocity in the gate. The transmittance was then applied to calculate tunneling currents in TiN/HfSiOxN/SiO2/p-Si MOS capacitors. The calculated results show that as the gate electron velocity increases, the transmittance decreases and therefore the tunneling current reduces. The tunneling current becomes lower as the equivalent oxide thickness (EOT) of HfSiOxN layer increases. When the incident electron passed through the barriers in the normal incident to the interface, the electron tunneling process becomes easier. It was also shown that the tunneling current was independent of the substrate orientation. Moreover, the model could be used in designing high speed MOS devices with low tunneling currents.
Volume: 10
Issue: 3
Page: 477-485
Publish at: 2012-09-01
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