Articles

Access the latest knowledge in applied science, electrical engineering, computer science and information technology, education, and health.

Advanced Search
Filter Icon

Filters article

Years

FAQ Arrow
Single Year
Range Year
0
0

Source Title

FAQ Arrow

Authors

FAQ Arrow

25,016 Article Results

A High Gain Observer Based Sensorless Nonlinear Control of Induction Machine

10.11591/ijpeds.v5.i3.pp305-314
Benheniche Abdelhak , Bensaker Bachir
In this paper a sensorless Backstepping control scheme for rotor speed and flux control of induction motor drive is proposed. The most interesting feature of this technique is to deal with non-linearity of high-order system by using a virtual control variable to render the system simple. In this technique, the control outputs can be derived step by step through appropriate Lyapunov functions. A high gain observer is performed to estimate non available rotor speed and flux measurements to design the full control scheme of the considered induction motor drive. Simulation results are presented to validate the effectiveness of the proposed sensorless Backstepping control of the considered induction motor.
Volume: 5
Issue: 3
Page: 305-314
Publish at: 2015-02-01

Similarity and Variance of Color Difference Based Demosaicing

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/4199
R. Niruban , T.Sree Renga Raja , R. Deepa
The aim of the project is to find the missing color samples at each pixel location by the combination of similarity algorithm and the variance of colour difference algorithm. Many demosaicing algorithms find edges in horizontal and vertical directions, which are not suitable for other directions. Hence using the similarity algorithm the edges are found in different directions. But in this similarity algorithm sometimes the horizontal and vertical directions are mislead. Hence this problem can be rectified using the variance of colour difference algorithm. It is proved experimentally that this new demosaicing algorithm based on similarity and variance of colouyr difference has better colour peak signal to noise ratio (CPSNR). It has better o0bjective and subjective performance. It is an analysis study of both similarity and colour variance algorithms. DOI: http://dx.doi.org/10.11591/telkomnika.v13i2.7048 
Volume: 13
Issue: 2
Page: 238-246
Publish at: 2015-02-01

Radial Basis Function Network Learning with Modified Backpropagation Algorithm

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/4215
Usman Muhammad Tukur , Siti Mariyam Shamsuddin
Radial Basis Function Network (RBFN) is a class of Artificial Neural Network (ANN) that was used in many classification problems in science and engineering. Backpropagation (BP) algorithm is a learning algorithm that was widely used in ANN. However, BP has major disadvantages of slow error rate convergence and always easily stuck at the local minima. Hence, Modified BP algorithm was proposed in this study to improve the learning speed of RBFN using discretized data. C programming language was used to develop the program for the proposed method. Performance measurement of the method was conducted and the experimental results indicate that our proposed method performs better in error rate convergence and correct classification compared to the result with continuous dataset. T-test statistical analysis was used to check the significance of the results and most were found to be satisfactorily significant. DOI: http://dx.doi.org/10.11591/telkomnika.v13i2.7032 
Volume: 13
Issue: 2
Page: 369-378
Publish at: 2015-02-01

Buck-Boost Control of Four Quadrant Chopper using Symmetrical Impedance Network for Adjustable Speed Drive

10.11591/ijpeds.v5.i3.pp424-432
Saswati Swapna Dash , Byamakesh Nayak
This paper proposes buck-boost capabilities of four quadrant chopper for wide range speed control of DC motor drives using symmetrical impedance network called Z-source network. By controlling the shoot through duty ratio from 0 to 0.5 and non-shoot through techniques, the Z-source four quadrant choppers can produce any desired DC voltage across the DC motor. The switching patterns for both buck and boost operations are presented to achieve four modes of operation of DC motor. As a result, the proposed model will have ride through capability during voltage sags, manage during voltage swells, used in any types of DC voltage sources such as fuel cell and solar cell and improve the reliability by reducing EMI noise. Analysis and simulation results are presented to demonstrate these new findings.
Volume: 5
Issue: 3
Page: 424-432
Publish at: 2015-02-01

A Universal Formula for Asymptotic Stabilization with Bounded Controls

10.11591/ijece.v5i1.pp111-118
Muhammad Nizam Kamarudin , Abdul Rashid Husain , Mohamad Noh Ahmad , Zaharuddin Mohamed
Motivated by Artstein and Sontag universal formula, this brief paper presents an explicit proof of the universal formula for asymptotic stabilization and asymptotic disturbance rejection of a nonlinear system with mismatched uncertainties and time varying disturbances. We prove the stability via Lyapunov stability criteria. We also prove that the control law satisfies small control property such that the magnitude of the control signal can be bounded without the catastropic effect to the closed loop stability. For clarity, we benchmark the proposed approach with other method namely a Lyapunov redesign with nonlinear damping function. We give a numerical example to verify the results.
Volume: 5
Issue: 1
Page: 111-118
Publish at: 2015-02-01

Performance Analysis of a DTC and SVM Based Field-Orientation Control Induction Motor Drive

10.11591/ijpeds.v5.i3.pp336-343
Md. Rashedul Islam , Md. Maruful Islam , Md. Kamal Hossain , Pintu Kumar Sadhu
This study presents a performance analysis of two most popular control strategies for Induction Motor (IM) drives: direct torque control (DTC) and space vector modulation (SVM) strategies. The performance analysis is done by applying field-orientation control (FOC) technique because of its good dynamic response. The theoretical principle, simulation results are discussed to study the dynamic performances of the drive system for individual control strategies using actual parameters of induction motor. A closed loop PI controller scheme has been used. The main purpose of this study is to minimize ripple in torque response curve and to achieve quick speed response as well as to investigate the condition for optimum performance of induction motor drive. Depending on the simulation results this study also presents a detailed comparison between direct torque control and space vector modulation based field-orientation control method for the induction motor drive.
Volume: 5
Issue: 3
Page: 336-343
Publish at: 2015-02-01

A Tactical Chaos based PWM Technique for Distortion Restraint and Power Spectrum Shaping in Induction Motor Drives

10.11591/ijpeds.v5.i3.pp383-392
V. Mohan , N. Stalin , S. Jeevananthan
The pulse width modulated voltage source inverters (PWM-VSI) dominate in the modern industrial environment. The conventional PWM methods are designed to have higher fundamental voltage, easy filtering and reduced total harmonic distortion (THD). There are number of clustered harmonics around the multiples of switching frequency in the output of conventional sinusoidal pulse width modulation (SPWM) and space vector pulse width modulation (SVPWM) inverters. This is due to their fixed switching frequency while the variable switching frequency makes the filtering very complex. Random carrier PWM (RCPWM) methods are the host of PWM methods, which use randomized carrier frequency and result in a harmonic profile with well distributed harmonic power (no harmonic possesses significant magnitude and hence no filtering is required). This paper proposes a chaos-based PWM (CPWM) strategy, which utilizes a chaotically changing switching frequency to spread the harmonics continuously to a wideband and to reduce the peak harmonics to a great extent. This can be an effective way to suppress the current harmonics and torque ripple in induction motor drives. The proposed CPWM scheme is simulated using MATLAB / SIMULINK software and implemented in three phase voltage source inverter (VSI) using field programmable gate array (FPGA).
Volume: 5
Issue: 3
Page: 383-392
Publish at: 2015-02-01

FPGA-Based Implementation Direct Torque Control of Induction Motor

10.11591/ijpeds.v5.i3.pp293-304
Saber Krim , Soufien Gdaim , Abdellatif Mtibaa , Mohamed Faouzi Mimouni
This paper proposes a digital implementation of the direct torque control (DTC) of an Induction Motor (IM) with an observation strategy on the Field Programmable Gate Array (FPGA). The hardware solution based on the FPGA is caracterised by fast processing speed due to the parallel processing. In this study the FPGA is used to overcome the limitation of the software solutions (Digital Signal Processor (DSP) and Microcontroller). Also, the DTC of IM has many drawbacks such as for example; The open loop pure integration has from the problems of integration especially at the low speed and the variation of the stator resistance due to the temperature. To tackle these problems we use the Sliding Mode Observer (SMO). This observer is used estimate the stator flux, the stator current and the stator resistance. The hardware implementation method is based on Xilinx System Generator (XSG) which a modeling tool developed by Xilinx for the design of implemented systems on FPGA; from the design of the DTC with SMO from XSG we can automatically generate the VHDL code. The model of the DTC with SMO has been designed and simulated using XSG blocks, synthesized with Xilinx ISE 12.4 tool and implemented on Xilinx Virtex-V FPGA.
Volume: 5
Issue: 3
Page: 293-304
Publish at: 2015-02-01

Robust SINS/GNSS Integration Method for High Dynamic Applications

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/4206
Falin Wu , Hengyang Zhao , Yan Zhao , Haibo Zhong
As high dynamic movement is always accompanied by colored noise which lacks of mathematical model, traditional Kalman filtering based on an assumption of white Gaussian noise always faces serious divergence. To enhance the performance in high dynamic environment with uncertain colored noise, a kind of robust filtering based on H-infinity technology isdeveloped. State model of the algorithm is derived from SINS error propagation. Both position and velocity errorsare used as the measurements. A simulation system which includes a tri-axial turntable and a GNSS signal simulator is used to verify the integration design under high dynamic environment. Simulation results proved that both the accuracy and robustness of the integration design have been improved significantly.DOI: http://dx.doi.org/10.11591/telkomnika.v13i2.6876 
Volume: 13
Issue: 2
Page: 292-299
Publish at: 2015-02-01

A Novel Approach of Position Estimation and Power Factor Corrector Converter Fed BLDC Motor

10.11591/ijpeds.v5.i3.pp415-423
S. Kaliappan , R. Rajeswari
This paper proposes a Power factor Corrected (PFC) Bridgeless Buck-Boost converter fed BLDC motor drive. The Bridgeless configuration eliminates the Diode Bridge Rectifier in order to reduce the number of components and the conduction loss. The position sensors used in BLDC drives have drawbacks of additional cost, mechanical alignment problems. These bottle necks results in sensorless technique. The Sensorless technique mostly relies on measurement of Back EMF to determine relative positions of stator and rotor for the correct coil energising sequence can be implemented. This paper introduces the offline Finite Element method for sensorless operation. The proposed sensorless scheme estimates the motor position at standstill and running condition. The obtained Power Factor is within the acceptable limits IEC 61000-3-2. The proposed drive is simulated in MATLAB/Simulink the obtained results are validated experimentally on a developed prototype of the drive.
Volume: 5
Issue: 3
Page: 415-423
Publish at: 2015-02-01

Analysis of Variable Speed PFC Chopper Fed BLDC Motor Drive

10.11591/ijpeds.v5.i3.pp326-335
A Jeya Selvan Renius , K Vinoth Kumar
This paper provides the detailed analysis of the DC-DC chopper fed Brushless DC motor drive used for low-power applications. The various methods used to improve the power quality at the ac mains with lesser number of components are discussed. The most effective method of power quality improvement is also simulated using MATLAB Simulink. Improved method of speed control by controlling the dc link voltage of Voltage Source Inverter is also discussed with reduced switching losses. The continuous and discontinuous modes of operation of the converters are also discussed based on the improvement in power quality. The performance of the most effective solution is simulated in MATLAB Simulink environment and the obtained results are presented.
Volume: 5
Issue: 3
Page: 326-335
Publish at: 2015-02-01

Dynamic RWX ACM Model Optimizing The Risk on Real Time Unix File System

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/4217
PK Patra , Padma Lochan Pradhan
The preventive control is one of the well advance controls for recent security for protection of data and services from the uncertainty. Because, increasing the importance of business, communication technologies and growing the external risk is a very common phenomenon now-a-days. The system security risks put forward to the management focus on IT infrastructure (OS). The top management has to decide whether to accept expected losses or to invest into technical security mechanisms in order to minimize the frequency of attacks, thefts as well as uncertainty. This work contributes to the development of an optimization model that aims to determine the optimal cost to be invested into security mechanisms deciding on the measure component of UFS attribute. Our model should be design in such way, the Read, Write & Execute automatically Protected, Detected and Corrected on RTOS. We have to optimize the system attacks and down time by implementing RWX ACM mechanism based on semi-group structure, mean while improving the throughput of the Business, Resources & Technology. DOI: http://dx.doi.org/10.11591/telkomnika.v13i2.7059 
Volume: 13
Issue: 2
Page: 387-398
Publish at: 2015-02-01

Design and Analysis of Drive System with Slip Ring Induction Motor for Electric Traction in India

10.11591/ijpeds.v5.i3.pp374-382
Nagamani Chandra sekara , Somanatham R , Chaitanya Kumar U
The use of Squirrel Cage for Traction has revolutionised the motive power of a Locomotive. The Asynchronous Motor is rugged with high starting Torque, has a very smooth Voltage and Speed control as compared to a DC Series Motor. When looking at the Traction perspective, a Slip Ring Induction Motor can be an alternative to the Squirrel Cage Motor as it has higher starting Torque and better efficiency than a Squirrel Cage Motor. the Slip Power Recovery scheme also plays a proactive role as ther can be substantial savings of energy in case of a Slip Ring Induction Motor. A detailed design and analysis of a Drive System with Slip Ring Induction Motor for Electric Traction is presented in this Research Paper
Volume: 5
Issue: 3
Page: 374-382
Publish at: 2015-02-01

Implementation of PI Controller for 4ф Srm Drive Using TMS320F28335

10.11591/ijpeds.v5.i3.pp283-292
Mekala N , Muniraj C
This paper presents the experimental investigation of DSP based 4Ф Switched Reluctance Motor (SRM) Drive. SRM is a doubly-salient, singly-excited machine and having very simple construction, has a low inertia and allows an extremely high-speed operation. The control system of SRM is highly complex due to non linear nature. In such a system for implementing control algorithm needs high speed processor. In this work TMS320F28335 DSP processor is used to implement the inner loop PI current controller and outer loop PI speed controller. The TMS320F28335 is highly integrated, high performance solution for challenging control applications. The various experimental tests are carried out in 1 HP 4Ф SRM. The experimental results are reported in order to verify the steady state, transient and robustness performance of the controller.
Volume: 5
Issue: 3
Page: 283-292
Publish at: 2015-02-01

A New Approach to Linear Estimation Problem in Multi-user Massive MIMO Systems

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/4212
Muhammad Ali Raza Anjum
A novel approach for solving linear estimation problem in multi-user massive MIMO systems is proposed. In this approach, the difficulty of matrix inversion is attributed to the incomplete definition of the dot product. The general definition of dot product implies that the columns of channel matrix are always orthogonal whereas, in practice, they may be not. If the latter information can be incorporated into dot product, then the unknowns can be directly computed from projections without inverting the channel matrix. By doing so, the proposed method is able to achieve an exact solution with a 25% reduction in computational complexity as compared to the QR method. Proposed method is stable, offers an extra flexibility of computing any single unknown, and can be implemented in just twelve lines of code. DOI:  http://dx.doi.org/10.11591/telkomnika.v13i2.7003 
Volume: 13
Issue: 2
Page: 337-351
Publish at: 2015-02-01
1 2 3
...
1667 1668
Show 1427 of 1668

Discover Our Library

Embark on a journey through our expansive collection of articles and let curiosity lead your path to innovation.

Explore Now
Library 3D Ilustration