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29,922 Article Results

Prediction of Load in Reverse Extrusion Process of Hollow Parts using Modern Artificial Intelligence Approaches

https://ijece.iaescore.com/index.php/IJECE/article/view/5587
M. Shariat Panahi , N. Moshtaghi Yazdani
Extrusion is one of the important processes to manufacture and produce military and industrial components. Designing its tools is usually associated with trial and error and needs great expertise and adequate experience. Reverse extrusion process is known as one of the common processes for production of hollow parts with closed ends. The significant load required in formation of a workpiece is one of the existing constraints for the reverse extrusion process. This issue becomes rather difficult especially for the parts having thin walls since its analysis using finite element softwares is exposed to some limitations. In this regard, application of artificial intelligence for prediction of load in the reverse extrusion process will not only save time and money, but also improve quality features of the product. Based on the existing data and methods suggested for variations of punching force through the reverse extrusion process, the system is trained and then performance of the system is evaluated using the test data in this paper. Efficiency of the proposed method is also assessed via comparison with the results of others.DOI:http://dx.doi.org/10.11591/ijece.v4i3.5356
Volume: 4
Issue: 3
Page: 372-377
Publish at: 2014-06-01

Control of Four Switch Three Phase Inverter Fed Induction Motor Drives Based Speed and Stator Resistance Estimation

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4991
Mohamed K Metwally
This paper presents sensorless position and speed control for a four-switch three-phase inverter (FSTPI) fed induction motor drive. Accurate knowledge of stator resistance is of utmost importance for correct operation of a number of speed sensorless induction motor control schemes in the low speed region. Since stator resistance inevitably varies with operating conditions, stable and accurate operation at near-zero speed requires an appropriate identification algorithm for the stator resistance. The paper proposes such an identification algorithm, which is developed for the rotor flux based model reference adaptive system (MRAS) type of the speed estimator in conjunction with a rotor flux oriented control scheme. In this speed estimation method only one (out of the two available) degree of freedom is utilized for speed estimation. It is utilize the second available degree of freedom as a mean for adapting the stator resistance. The parallel stator resistance and rotor speed identification algorithm is developed in a systematic manner, using Popov’s hyper stability theory. It increases the complexity of the overall control system insignificantly and enables correct speed estimation and stable drive operation at near-zero speeds. The proposed speed and position estimator with parallel stator resistance identification for FSTPI fed induction motor at very low speed under high load operation is verified by simulation and experimental results. The results show the robustness of the proposed method with FSTPI.DOI: http://dx.doi.org/10.11591/ijpeds.v4i2.5057
Volume: 4
Issue: 2
Page: 192-203
Publish at: 2014-06-01

Hard-Disk Stereo Vision Measurement System Calibration Using Light Plane Constraint

10.11591/ijeecs.v12.i6.pp4808-4813
Rui-Yin Tang , Peng-Fei Li
This paper proposed a calibration method of sheet-of-light vision measurement sensor based on light plane constraint. Through capturing 12 images of different direction from homemade circular calibration target, the center of the circle and the light stripe is extracted based on Halcon platform of Germany. The experimental results obtained the intrinsic parameters, extrinsic parameters and radial distortion coefficient of the nonlinear model. At the same time the light plane constraint equation is got based on PCA plane fitting method. The results show that the calibration method is simple and reliable, and the method does not need any auxiliary adjustment. The work laid the better foundation for hard disk planeness vision measurement.
Volume: 12
Issue: 6
Page: 4808-4813
Publish at: 2014-06-01

Stabilization of Solar-Wind Hybrid Power System by Using SMES

https://ijece.iaescore.com/index.php/IJECE/article/view/5582
S.M. Mohiuddin , M.R.I. Sheikh
The depleting fossil fuel reserves and increasing concern towards global warming created the need to surge for the renewable energy sources. Wind and solar power generation are two of the most promising renewable power generation technologies. This paper deals with the simulation of a Solar-Photovoltaic and Wind hybrid power generation system equipped with Superconducting Magnetic Energy Storage (SMES) in MATLAB/SIMULINK environment. The Solar-Photovoltaic Module and Permanent Magnet Synchronous Generator (PMSG) based wind turbine is simulated separately. Then they are connected to a dc bus. Since the intermittent nature of Solar and Wind makes the system unreliable, so an energy storage system SMES is introduced to reduce output fluctuations. Varying wind speed and solar irradiance value are taken as the input parameters. The simulation results show that a system with SMES is more reliable than a system without SMES.DOI:http://dx.doi.org/10.11591/ijece.v4i3.6039
Volume: 4
Issue: 3
Page: 351-358
Publish at: 2014-06-01

Test Data Analysis on Voltage Regulation of Proportion Relief Valve

10.11591/ijeecs.v12.i6.pp4491-4499
Pei Weichi , Cao Fukai , Zhao Shuzhong
The miniature reform design was to improve the voltage regulation of regular valve and proportional valve. LabVIEW was used to develop CAT voltage regulation of proportion relief valve with electro hydraulic proportional control and visual instrument. The content of the pressure adjustment of proportional relief valve was introduced from different angles and the steady-state. Test on voltage regulation of proportion relief valve was analyzed. The sampling data were processed and analyzed on a time domain and frequency domain basis. Related conclusions are made by analysis on current linearity, steady-state pressure, and pressure-adjusting delay. Systematic methods and references are provided for the development of other valves to improve the function and the system of proportional valve. DOI: http://dx.doi.org/10.11591/telkomnika.v12i6.5488
Volume: 12
Issue: 6
Page: 4491-4499
Publish at: 2014-06-01

A Unified Call-to-Prayer Framework in Muslim World

https://ijece.iaescore.com/index.php/IJECE/article/view/5576
Naeem Al-Oudat , Abdel Ilah Alshbatat
In many Muslim countries there are many sounds that are fired at nearly the same time via loudspeakers. This sound is a call-to-prayer (Azan). Azan is fired from the so-called mosques in many countries where, theses mosques are still using its own timing to trigger such call and its own amplifier gain regardless of other mosques in the region. This results in an out of sync call-to-prayer firing and a very noisy and distracting mix of sounds in many places at the same region. In this paper, a unified call-to-prayer framework is proposed that sheds light on these issues and gives solution directions for the above mentioned issues in the currently used systems.DOI:http://dx.doi.org/10.11591/ijece.v4i3.5758
Volume: 4
Issue: 3
Page: 314-321
Publish at: 2014-06-01

A Neural Network Based MPPT Technique Controller for Photovoltaic Pumping System

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4996
Mohammed Yaichi , Mohammed-Karim Fellah , Abdelkrim Mammeri
The article proposes a novel method using the artificial neural network (ANN) for the improvement of the performances of a photovoltaic system composed of a photovoltaic (PV) array, an inverter, a motor asynchronous and a centrifugal pump. For this type of system, different optimization strategies have been proposed to improve the over of the PV system efficiency, i.e. the PV generator is forced to operate at its maximum power point “MPPT”, generally, by the insertion of DC/DC boost converter between the photovoltaic array and the inverter. In this work we propose an approach, where optimization is realized without need adding a DC/DC converter to the chain, using field-oriented control through the monitoring of the voltage-fed inverter frequency. The motor is also ensured in all insolation conditions. A multilayer feed forward perception type NN is proposed for MPPT control, and the back-propagation algorithm is used for training. The performances of the drive with ANN-based MPPT are excellent. The maximum power point (MPP) can be easily obtained to frequency-controlled drive.DOI: http://dx.doi.org/10.11591/ijpeds.v4i2.5875
Volume: 4
Issue: 2
Page: 241-255
Publish at: 2014-06-01

Output Regulation for Saturated Systems with Nonlinear Exosystem

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3495
Huang Wei
In this brief, we investigate the output regulation problem of saturated linear system under the action of nonlinear exosystem. Particularly, for saturated systems with periodically time-dependent exosytem, the K-step asymptotically regulatable region is given, which is a set of all initial states of the plant and the ecosystem. Improved internal model principles are constructed and the feedback controller is designed to ensure exponential output regulation in the regulatable region with disturbance rejection. Simulation examples are given to illustrate the effectiveness of proposed method, the systems go into stable rapidly and periodically.DOI : http://dx.doi.org/10.11591/telkomnika.v12i6.5535
Volume: 12
Issue: 6
Page: 4222-4229
Publish at: 2014-06-01

An Optimal HSI Image Compression using DWT and CP

https://ijece.iaescore.com/index.php/IJECE/article/view/5592
D. Narmadha , K. Gayathri , K. Thilagavathi , N.Sardar Basha
The compression of hyperspectral images (HSIs) has recently become a very attractive issue for remote sensing applications because of their volumetric data. An efficient method for hyperspectral image compression is presented. The proposed algorithm, based on Discrete Wavelet Transform and CANDECOM/PARAFAC (DWT-CP), exploits both the spectral and the spatial information in the images. The core idea behind our proposed technique is to apply CP on the DWT coefficients of spectral bands of HSIs. We use DWT to effectively separate HSIs into different sub-images and CP to efficiently compact the energy of sub-images. We evaluate the effect of the proposed method on real HSIs and also compare the results with the well-known compression methods. The obtained results show a better performance when comparing with the existing method PCA with JPEG 2000 and 3D SPECK.DOI:http://dx.doi.org/10.11591/ijece.v4i3.6326 
Volume: 4
Issue: 3
Page: 411-421
Publish at: 2014-06-01

Deployment of TinyOS for Online Water Sensing

10.11591/ijeecs.v12.i6.pp4802-4807
Xin Wang , Pan Xu
Current quality assessment methods of water parameters are mainly laboratory based, require fresh supplies of chemicals, trained staff and are time consuming. Sensor networks are great alternatives for such requirements. We present a practical application of wireless networks: a remote water monitoring system running TinyOS. The contents of several chemicals in the water are sensed and transmitted. The sensor data are collected and transmitted via ZigBee and GPRS. Instead of focusing on theoretic issues such as routing algorithms, network lifetime and so on, we investigate special techniques involved in the implementation of the system while employing TinyOS and its special programming language.
Volume: 12
Issue: 6
Page: 4802-4807
Publish at: 2014-06-01

Performance Comparison between Classic and Intelligent Methods for Position Control of DC Motor

https://ijece.iaescore.com/index.php/IJECE/article/view/5586
Navid Moshtaghi Yazdani , Arezoo Yazdani Seqerloo
Controlling DC motors is mainly done by controlling either voltage or field of their armature. Numerous methods have been proposed so far for this purpose. Some intelligent methods such as XCSR and machine learning systems are used to control position of a separately excited DC motor. Having set output position of the motor to its basic position, voltage of armature becomes zero and the motor stops working. Characteristic features of the methods in this paper are resistance against changing friction and moment of inertia. Meanwhile, time to reach stability in this type of controllers is considerably lower than that of PID controller with no oscillations being observed in the responses.DOI:http://dx.doi.org/10.11591/ijece.v4i3.5355
Volume: 4
Issue: 3
Page: 366-371
Publish at: 2014-06-01

An Implementation Mechanisms of SVM Control Strategies Applied to Five Levels Cascaded Multi-Level Inverters

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4987
Mohammed Yaichi , Mohammed-Karim Fellah
In the area of the energy control with high voltage and power, the multilevel inverters constitute a relatively recent research orientation. The current applications of this technology are in the domains of the high voltage (over hundred kV), variable speed drives, transport and distribution of a good quality of electrical energy (HVDC, FACTS system, ....). To improve the output voltage for such inverters, many different modulation strategies have been developed. Among these strategies, the SVM (Space Vector Modulation). The technique provide the nearest switching vectors sequence to the reference vector without involving trigonometric functions and provide the additional advantages of superior harmonic quality. In this paper, we analyze different mechanisms of the output voltage synthesis and the problem of even order harmonic production. With the proposed a new trajectory SVM, which can eliminate all the even order harmonics for five levels inverter. Show clearly how to deduce the trajectories from the sequences allowing to have better performances among several possible trajectories. It is dedicated to the application of two particular trajectories.DOI: http://dx.doi.org/10.11591/ijpeds.v4i2.5507
Volume: 4
Issue: 2
Page: 146-155
Publish at: 2014-06-01

A New Cryptographic Strategy for Digital Images

https://ijece.iaescore.com/index.php/IJECE/article/view/5602
Nidhi Sethi , Sandip Vijay
In this paper, a new image block cipher encryption strategy for gray scale images using a different set of secret key and sizes is proposed. Initially, the swapping and dispersion is done without keys and in second stage the image is mixed with the chirikov map involving first secret key.  'N' rounds are taken to complete this process. The blended image is divided into blocks of block size 8X8.These blocks are also swapped to achieve good confusion. For making the encryption scheme more sturdy in each block the transmutation of pixels is done with the modified logistic map having three more secret keys.  The proposed scheme is simple, rapid and sensitive to the secret key. Due to the high order of substitution, common attacks such as linear and differential cryptanalysis are unattainable. The experimental results show that the proposed encryption technique is effective and has high security features.DOI:http://dx.doi.org/10.11591/ijece.v4i3.6325
Volume: 4
Issue: 3
Page: 456-462
Publish at: 2014-06-01

Application of Backstepping to the Virtual Flux Direct Power Control of Five-Level Three-Phase Shunt Active Power Filter

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4990
Bouzidi Mansour , Bouafia Saber , Bouzidi Ali Ali , Benaissa Abdelkader , Barkat Said
This paper proposes a virtual flux direct power control-space vector modulation combined with backstepping control for three-phase five-level neutral point clamped shunt active power filter. The main goal of the proposed active filtering system is to eliminate the unwanted harmonics and compensate fundamental reactive power drawn from the nonlinear loads. In this study, the voltage-balancing control of four split dc capacitors of the five-level active filter is achieved using five-level space vector modulation with balancing strategy based on the effective use of the redundant switching states of the inverter voltage vectors. The obtained results showed that, the proposed multilevel shunt active power filter with backstepping control can produce a sinusoidal supply current with low harmonic distortion and in phase with the line voltage.DOI: http://dx.doi.org/10.11591/ijpeds.v4i2.5621
Volume: 4
Issue: 2
Page: 173-191
Publish at: 2014-06-01

Ultrasonic Automatic Tracking System

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3554
Dai Juan , Zhao Zhihong , Yan Minglian
Ultrasonic ranging system has many characteristics, such as well-directionality, small volume, and low price, but fails to realize a long distance measured. In order to realize exactly locating motion objects, multiple ultrasonic sensors are adopted to measure their motion orientation so that their 2D coordinates should be located and positioned, which results in calculations complicated and meanwhile measurement subject to errors. This study addresses a measurement method to realize automatically tracking motion objects. It has a reasonable distribution structure of the ultrasonic sensors adopted, critical tracking calculation method, which makes it possible to solve complex problems of equations. As it has simple control instruction sequence, it is able to precisely control timing period and effectively solve measure error caused by irregular delay from commands. These programs and methods are well deployed in the parameters collection and status control system for a moving object. DOI: http://dx.doi.org/10.11591/telkomnika.v12i6.5449 
Volume: 12
Issue: 6
Page: 4664-4670
Publish at: 2014-06-01
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