ENP Engineering Science Journal //enpesj.enp.edu.dz/index.php/enpesj <p>Ecole Nationale Polytechnique (ENP) is an academic and research institution where thousands of Engineers and PhDs have been educated during the last 6 decades. Its alumna and alumnus have had a positive impact on industry and science all over the world. ENP aims to disseminate high-quality academic work to contribute to technology and science advances for humanity.</p> <p>The ENP Engineering Science journal (ENPESJ) is a peer-reviewed open-access journal. It bi-annually publishes reviews and full original research papers covering all aspects of recent advances in engineering dealing with: </p> <ul> <li> Electrical and Computer Engineering</li> <li>Industrial Engineering</li> <li>Mechanical and Materials Engineering</li> <li>Civil and Hydraulic Engineering</li> <li>Chemical and Environmental Engineering</li> </ul> <p>The journal would focus also on technology with industry applications, it plans to publish special issues on up-to-date emerging technologies and new research directions. ENPESJ Promotes Open Science through truly free open access peer-reviewed journal articles.</p> en-US <p>Articles published under a Publisher Office user license are protected by copyright. Users may access, download, copy, translate, text and data mine the articles for non-commercial purposes provided that users:</p> <ul> <li>Cite the article using an appropriate bibliographic citation (i.e. author(s), journal, article title, volume, issue, page numbers, DOI and the link to the definitive published version)</li> <li>Maintain the integrity of the article</li> <li>Retain copyright notices and links to these terms and conditions so it is clear to other users what can and cannot be done with the article</li> <li>Ensure that, for any content in the article that is identified as belonging to a third party, any re-use complies with the copyright policies of that third party</li> <li>Any translations, for which a prior translation agreement with Publisher Office has not been established, must prominently display the statement: <em>"This is an unofficial translation of an article that appeared in a Publisher Office publication. Publisher Office has not endorsed this translation."</em></li> </ul> <p>This is a non commercial license where the use of published articles for commercial purposes is prohibited. Commercial purposes include: </p> <ul> <li>Copying or downloading articles, or linking to such postings, for further redistribution, sale or licensing, for a fee </li> <li>Copying, downloading or posting by a site or service that incorporates advertising with such content</li> <li>The inclusion or incorporation of article content in other works or services (other than normal quotations with an appropriate citation) that is then available for sale or licensing, for a fee</li> <li>Use of articles or article content (other than normal quotations with appropriate citation) by for-profit organizations for promotional purposes, whether for a fee or otherwise.</li> <li>Use for the purposes of monetary reward by means of sale, resale, license, loan, transfer or other form of commercial exploitation.</li> </ul> mourad.adnane@g.enp.edu.dz (Prof. Mourad ADNANE) ouiza.satour@g.enp.edu.dz (Ouiza SATOUR) Wed, 28 Dec 2022 11:54:06 +0000 OJS 3.3.0.13 http://blogs.law.harvard.edu/tech/rss 60 A review of Stall Delay Models and their Application on Hybrid Methods //enpesj.enp.edu.dz/index.php/enpesj/article/view/65 <p>This paper is a review on the stall delay phenomenon that Horizontal Axis Wind Turbines (HAWT) encounter under typical flow conditions and its numerical modelling. Aerodynamic performance predictions of HAWT have been often carried out through Computational Fluid Dynamics method with the combination of the concept of actuator disk i.e. hybrid method. For this purpose, the hybrid method is presented in details together with the numerical modelling of such stall delay phenomenon. Despite modern wind turbines are equipped with sophisticated control systems for avoiding stall, nevertheless, stall is still inevitable in the near root region of the rotor blade. This paper focuses on recent research development materials which have been undertaken on the stall delay phenomenon where the engineering models (stall delay models) of the literature being presented and criticized based on the predictions obtained from the NREL Phase VI wind turbine experiments.</p> Mohammed Nadjib Hamlaoui, Arezki Smaili, Hachimi Fellouah Copyright (c) 2022 ENP Engineering Science Journal https://creativecommons.org/licenses/by-nc-sa/4.0 //enpesj.enp.edu.dz/index.php/enpesj/article/view/65 Wed, 28 Dec 2022 00:00:00 +0000 Speed estimation of a Doubly Fed Induction Machine controlled by a Field Oriented Control Strategy //enpesj.enp.edu.dz/index.php/enpesj/article/view/77 <p>This paper studies the estimation problem of speed in a Doubly Fed Induction Machine (DFIM) controlled by a Field Oriented Control (FOC) Strategy. The DFIM is the most responsive in variable speed. The chosen configuration uses two voltage inverters connected to the stator and rotor windings, to adopt the power distribution between them through the pulses distribution of the stator and the rotor in motor operating mode. It is necessary to model the DFIM in three-phase equations and then in two-phase equations faithfully representing the characteristics of the machine. From this model, we can design and simulate the control. The control by oriented rotor flux can be realized by using the speed provided by sensors or estimators. In this paper, we have used the Extended Kalman Filter (EKF) in order to avoid problems caused by the motor speed sensor and improve the robustness of the control and its performance without using any speed sensor.</p> Tahar Djellouli, Mohamed Seghir Boucherit Copyright (c) 2022 ENP Engineering Science Journal https://creativecommons.org/licenses/by-nc-sa/4.0 //enpesj.enp.edu.dz/index.php/enpesj/article/view/77 Wed, 28 Dec 2022 00:00:00 +0000 Production of hydrogen and carbon nanofilaments using a novel reactor configuration: hydrodynamic study and experimental results //enpesj.enp.edu.dz/index.php/enpesj/article/view/115 <p>A novel reactor configuration combining two beds, a central fluidized bed and an annular mobile bed, was designed for the production of hydrogen and carbon nanofilaments via dry reforming of gases produced from the pyrolysis of plastic waste. This combination allows for easy recovery of these nanomaterials and, since the mixture of catalyst and carbon formed is continuously fluidized, it also prevents blockage. Understanding the hydrodynamics is crucial for choosing the optimal operating conditions. Thus, a cold mock-up unit of the same size has been built and used. Since the gases produced by plastic pyrolysis are mainly composed of unsaturated hydrocarbons, the prototype reactor setup has been operated using ethylene as a surrogate molecule. The preliminary experimental results of the reactor operation with ethylene obtained so far are very promising and confirm the operability of the process. Next step is to operate continuously for longer time and reach a production of 1kg/h of carbon nanofilaments.</p> Abir Azara, Jasmin Blanchard, Faroudja Mohellebi, EL Hadi Benyoussef, François Gitzhofer, Nicolas Abatzoglou Copyright (c) 2022 ENP Engineering Science Journal https://creativecommons.org/licenses/by-nc-sa/4.0 //enpesj.enp.edu.dz/index.php/enpesj/article/view/115 Wed, 28 Dec 2022 00:00:00 +0000 Microstructural, Mechanical and Electrochemical Characterization of a Flame Sprayed NiFeCrBSi/WC Cermet Coating //enpesj.enp.edu.dz/index.php/enpesj/article/view/107 <p>To increase the lifetime of drilling bits, these components are usually covered with hard metal matrix composites. Nowadays, nickel based metal matrix composites arise as substitutes to cobalt-based ones. The challenge now is to provide an efficient coating with low cost. The aim of this paper is to exploit the characteristics of a newly designed flame sprayed NiFeCrBSi-WC composite coatings. The experimental activities were carried out using the scanning electron microscopy, for the microstructural analysis of coating. Additionally, micro-hardness and nano-indentation tests were carried out to evaluate the resistance of the coatings against penetration. Moreover, the electrochemical behavior was assessed in NaCl and Na<sub>2</sub>SO<sub>4</sub> aqueous solutions. The ionic concentrations were varied between 1 g/l to 35 g/l. The results show that the microstructure is dendritic and characterized by the presence of hard chromium carbides and nickel grains in the inter-dendritic space. The coating was subject to a slight decarburization. The presence of carbides and the decarburization make the microhardness of the matrix fluctuates between 300 HV to 900 HV. For the electrochemical response, the increase in ion concentration induces a decrease in the corrosion resistance. In Na<sub>2</sub>SO<sub>4</sub> aqueous solutions, the charge transfer is roughly constant for the concentrations above 1 g/l.</p> Rabah Azzoug, Yamina Mebdoua, Fatah Hellal Copyright (c) 2022 ENP Engineering Science Journal https://creativecommons.org/licenses/by-nc-sa/4.0 //enpesj.enp.edu.dz/index.php/enpesj/article/view/107 Wed, 28 Dec 2022 00:00:00 +0000 Mesophilic anaerobic co-digestion of cheese whey with cow manure in batch reactor //enpesj.enp.edu.dz/index.php/enpesj/article/view/171 <p class="Abstract" style="margin-bottom: 11.0pt;"><span lang="EN-US">Anaerobic digestion is a biological process that takes place under very strict operating conditions, including a pH close to neutrality. This experimental work aims to study the effect of pH control on CH<sub>4</sub> production in mesophilic anaerobic co-digestion of cheese whey with cow manure. Two experiments were conducted in batch reactor, the first without pH adjustment and the second with pH adjustment. The results of the first co-digestion revealed an inhibition of the methanization process by acidification of the medium and accumulation of volatile fatty acids; whereas during the second co-digestion with pH adjustment by sodium bicarbonates (1M), the process was improved with methane levels (&gt; 50%) in the biogas. The accumulated biogas volume was two times higher for the same operating time in the digester.</span></p> Nassima Tirichine, Meryem Saber, Mohamed Khitous, Hakim Lounici, Rabah Bouarab Copyright (c) 2022 ENP Engineering Science Journal https://creativecommons.org/licenses/by-nc-sa/4.0 //enpesj.enp.edu.dz/index.php/enpesj/article/view/171 Wed, 28 Dec 2022 00:00:00 +0000 Survey and Classification of Hybrid GMPPT Techniques for Photovoltaic System under Partial Shading Conditions //enpesj.enp.edu.dz/index.php/enpesj/article/view/116 <p>A maximum power point tracking process is a very important task to harvest the maximum power available from a photovoltaic generator. For this reason, resorting to the development of new and more effective methods is an absolute necessity. Numerous advanced methods have been successfully employed to extract the real maximum point, such as neural networks and metaheuristic techniques. These techniques deal effectively in such conditions. However, the use of the algorithm alone has some limitations. In order to solve these drawbacks, the combination of two or more different techniques provides more advantages over single MPPT algorithms and improves the performance of the overall system. This paper mainly focus in reviewing the most important and recent hybrid global MPPT techniques proposed in the literature and proposes a classification of these methods with a comparison of their performances. All surveyed hybrid GMPPT methods are divided into four categories according to algorithms types involved in the MPPT method. This review study intends to make it easier for the user to make the convenient selection of which method to adopt especially in the presence of a variety of methods which are continuously developing in the literature. For this reason, resorting to the development of new and more effective methods is an absolute necessity to avoid the aforementioned problems. In the same context, numerous advanced methods have been successfully employed to extract the real maximum point, such as neural networks and metaheuristic techniques. These techniques deal effectively in such conditions. However, the use of the algorithm alone has some limitations. In order to solve these drawbacks, the combination of two or more different techniques provides more advantages over single MPPT algorithms and improves the performance of the overall system. This paper mainly focus in reviewing the recent hybrid global MPPT techniques proposed in the literature and proposes a classification of these methods with a comparison of their performances. All surveyed hybrid GMPPT methods are divided into four categories according to algorithms types involved in the MPPT method. This review study intends to make it easier for the user to make the convenient selection of which method to adopt especially in the presence of a variety of methods which are continuously developing in the literature.</p> Faiza Belhachat, Cherif Larbes Copyright (c) 2022 ENP Engineering Science Journal https://creativecommons.org/licenses/by-nc-sa/4.0 //enpesj.enp.edu.dz/index.php/enpesj/article/view/116 Wed, 28 Dec 2022 00:00:00 +0000 Objective Evaluation of the Pathological Voice Based on Deep Learning Neural Networks in an Algerian hospital environment //enpesj.enp.edu.dz/index.php/enpesj/article/view/170 <p>In this study, we propose a method based on Recurrent Neural Networks, to objectively evaluate the process of rehabilitation of the pathological voice, in an Algerian clinical environment. We choose Unilateral Laryngeal Paralysis as the pathology of the voice. In this paper, we used a Deep Learning system of pathological voice detection by Long Short Term Memory neural model (LSTM). As the dysphony studied in our work concerns essentially the laryngeal vibration, we choose the acoustic parameters based on the instability of the frequency and the amplitude of the laryngeal vibration: Jitter and Shimmer, Noise parameters and Cepstraux MFCC coefficients (Mel Frequency Cepstral Coefficients). A pathological voice detection rate of 88.65% shows important results brought by the rehabilitation technique adopted in Algerian clinical setting. The exclusive and abusive use of hearing to evaluate the effect of speech rehabilitation in the Algerian hospital environment remains insufficient. It is important to correlate perceptual data with objective methods based on detection and classification methods by introducing relevant acoustic parameters, for an effective and objective management of vocal pathology assessment.</p> Mahraz Kabache, Mhania Guerti Copyright (c) 2022 ENP Engineering Science Journal https://creativecommons.org/licenses/by-nc-sa/4.0 //enpesj.enp.edu.dz/index.php/enpesj/article/view/170 Wed, 28 Dec 2022 00:00:00 +0000 Breakout Stocks Identification using Machine Learning Approaches //enpesj.enp.edu.dz/index.php/enpesj/article/view/173 <p>Stock market offers a platform for people to engage in trading. It contributes to the growth of nation. Decision making regarding investments needs to be done very carefully so that an investor does not suffer massive loss. Since the share market is susceptible to experience huge change at any given moment, with the probability of profit comes huge risks of losing a fortune. In our research, we have worked on prediction of breakout stocks. If identified properly, it can help one to invest efficiently. We have used multiple machine learning approaches as ML models can offer more effective predictions compared to other methods due to the ability to learn and adapt from dataset information. In our experiment, the models have yielded very good results.</p> Md. Siam Ansary Copyright (c) 2022 ENP Engineering Science Journal https://creativecommons.org/licenses/by-nc-sa/4.0 //enpesj.enp.edu.dz/index.php/enpesj/article/view/173 Wed, 28 Dec 2022 00:00:00 +0000 An Overview on the Recent Advances of the Voltage Source Converter Control Modes in Terms of their Roles in Transmission Grid Ancillary Services //enpesj.enp.edu.dz/index.php/enpesj/article/view/147 <p>Voltage Source Converters (VSC) are expected to be one of the major actors in future AC transmission grids. Their role includes the interconnection of renewable energy, from distributed sources such as residential PV to large Offshore Wind Farms (OWF) using HVDC. With the ongoing decommissioning of traditional power plants with their synchronous generators, VSCs must now bring support functions to the grid. The aim of this paper is to review the different grid services that can be achieved through VSCs and discuss their compatibility with the state-of-the-art VSC controls especially the so-called grid-following and grid-forming controls. After presenting the upcoming issues of future grids and classifying the main VSC controls, this paper deals with the different additional control laws which make it possible to support the AC grid. Some recommendations regarding future grid services classifications and power and energy requirements are given. A comparative table is also proposed to assess the role of the different control modes.</p> Rayane Mourouvin, Jing Dai, Seddik Bacha, Didier Georges, Abdelkrim Benchaib Copyright (c) 2022 ENP Engineering Science Journal https://creativecommons.org/licenses/by-nc-sa/4.0 //enpesj.enp.edu.dz/index.php/enpesj/article/view/147 Wed, 28 Dec 2022 00:00:00 +0000 Beneficiation of Oolitic Iron Ore Sourced from Gara Djebilet using Coal-Based Direct Reduction prior to Magnetic Separation //enpesj.enp.edu.dz/index.php/enpesj/article/view/66 <p>A process involving coal-based direct reduction followed by wet low-intensity magnetic separation is presented in this paper with the objective of promoting the Fe content and reducing the P assay of phosphorus-rich oolitic iron ore. A final direct reduced iron powder assaying 92.5 wt% Fe and 0.2wt % P at a recovery rate of 95.9% was obtained when a mixture of ore-coal-CaO was reduced at 1200°C during 60 min in the presence of 7.5% sodium sulfate. In addition, microscopic analyses reported that the oolitic texture was completely destroyed, and most of the iron occurred in the metallic state. These findings suggest the ease utilisation of the ore mined from Gara Djebilet in the steelmaking industry as a substitute to scrap steel in electric arc furnace.</p> Farid Aghilasse Mansour, Malek Ould Hamou, Amira Merchichi, Nabil Babahoum Copyright (c) 2022 ENP Engineering Science Journal https://creativecommons.org/licenses/by-nc-sa/4.0 //enpesj.enp.edu.dz/index.php/enpesj/article/view/66 Wed, 28 Dec 2022 00:00:00 +0000