Publications

2021
Nezzar H, FERROUDJI F, OUTTAS T, Saihi L, Roummani K. Simulation Analysis on The Strength Of Composite VAWT Blade. The First International Conference on Renewable energy Advanced Technologies and Applications 28-30 June, 2021At: Research Unit for Renewable Energies in Saharan Region, [Internet]. 2021 :303. Publisher's VersionAbstract

As a key wind turbine element, the blade is a determining factor for reliability and efficiency of the turbine system and a main source of complicated and critical loads. In this present investigation, the strength behavior of a small composite blade for H-type Darrieus wind turbine was studied. Firstly, three-dimensional (3D) modelling of the blade structure with NACA 0018 airfoil profile was established. Secondly, the Finite element analysis (FEA) technique was conducted to perform the strength analysis of the blade structure subjected to extreme climatic conditions by means SOLIDWORKS SIMULATION software. This analysis was performed to identify the resistance, stiffness and reliability of the composite blade structure. The results from FEA identify that the structure of the blade will not be subjected to structural failure during WT operation (0 ~ 19 m/s) according to maximum principal stress equivalent (von Mises) and maximum displacements.

Nezzar H, FERROUDJI F, OUTTAS T, Saihi L, Roummani K. Simulation Analysis on The Strength Of Composite VAWT Blade. The First International Conference on Renewable energy Advanced Technologies and Applications 28-30 June, 2021At: Research Unit for Renewable Energies in Saharan Region, [Internet]. 2021 :303. Publisher's VersionAbstract

As a key wind turbine element, the blade is a determining factor for reliability and efficiency of the turbine system and a main source of complicated and critical loads. In this present investigation, the strength behavior of a small composite blade for H-type Darrieus wind turbine was studied. Firstly, three-dimensional (3D) modelling of the blade structure with NACA 0018 airfoil profile was established. Secondly, the Finite element analysis (FEA) technique was conducted to perform the strength analysis of the blade structure subjected to extreme climatic conditions by means SOLIDWORKS SIMULATION software. This analysis was performed to identify the resistance, stiffness and reliability of the composite blade structure. The results from FEA identify that the structure of the blade will not be subjected to structural failure during WT operation (0 ~ 19 m/s) according to maximum principal stress equivalent (von Mises) and maximum displacements.

Nezzar H, FERROUDJI F, OUTTAS T, Saihi L, Roummani K. Simulation Analysis on The Strength Of Composite VAWT Blade. The First International Conference on Renewable energy Advanced Technologies and Applications 28-30 June, 2021At: Research Unit for Renewable Energies in Saharan Region, [Internet]. 2021 :303. Publisher's VersionAbstract

As a key wind turbine element, the blade is a determining factor for reliability and efficiency of the turbine system and a main source of complicated and critical loads. In this present investigation, the strength behavior of a small composite blade for H-type Darrieus wind turbine was studied. Firstly, three-dimensional (3D) modelling of the blade structure with NACA 0018 airfoil profile was established. Secondly, the Finite element analysis (FEA) technique was conducted to perform the strength analysis of the blade structure subjected to extreme climatic conditions by means SOLIDWORKS SIMULATION software. This analysis was performed to identify the resistance, stiffness and reliability of the composite blade structure. The results from FEA identify that the structure of the blade will not be subjected to structural failure during WT operation (0 ~ 19 m/s) according to maximum principal stress equivalent (von Mises) and maximum displacements.

Nezzar H, FERROUDJI F, OUTTAS T, Saihi L, Roummani K. Simulation Analysis on The Strength Of Composite VAWT Blade. The First International Conference on Renewable energy Advanced Technologies and Applications 28-30 June, 2021At: Research Unit for Renewable Energies in Saharan Region, [Internet]. 2021 :303. Publisher's VersionAbstract

As a key wind turbine element, the blade is a determining factor for reliability and efficiency of the turbine system and a main source of complicated and critical loads. In this present investigation, the strength behavior of a small composite blade for H-type Darrieus wind turbine was studied. Firstly, three-dimensional (3D) modelling of the blade structure with NACA 0018 airfoil profile was established. Secondly, the Finite element analysis (FEA) technique was conducted to perform the strength analysis of the blade structure subjected to extreme climatic conditions by means SOLIDWORKS SIMULATION software. This analysis was performed to identify the resistance, stiffness and reliability of the composite blade structure. The results from FEA identify that the structure of the blade will not be subjected to structural failure during WT operation (0 ~ 19 m/s) according to maximum principal stress equivalent (von Mises) and maximum displacements.

Nezzar H, FERROUDJI F, OUTTAS T, Saihi L, Roummani K. Simulation Analysis on The Strength Of Composite VAWT Blade. The First International Conference on Renewable energy Advanced Technologies and Applications 28-30 June, 2021At: Research Unit for Renewable Energies in Saharan Region, [Internet]. 2021 :303. Publisher's VersionAbstract

As a key wind turbine element, the blade is a determining factor for reliability and efficiency of the turbine system and a main source of complicated and critical loads. In this present investigation, the strength behavior of a small composite blade for H-type Darrieus wind turbine was studied. Firstly, three-dimensional (3D) modelling of the blade structure with NACA 0018 airfoil profile was established. Secondly, the Finite element analysis (FEA) technique was conducted to perform the strength analysis of the blade structure subjected to extreme climatic conditions by means SOLIDWORKS SIMULATION software. This analysis was performed to identify the resistance, stiffness and reliability of the composite blade structure. The results from FEA identify that the structure of the blade will not be subjected to structural failure during WT operation (0 ~ 19 m/s) according to maximum principal stress equivalent (von Mises) and maximum displacements.

ZARROUKI MBE, Benaggoune S, Abdessemed R. STRATÉGIE DE CONTRÔLE NON LINÉAIRE OPTIMISÉE POUR LE GÉNÉRATEUR SYNCHRONE À AIMANT PERMANENT (GSAP) DANS LE SYSTÈME DE CONVERSION DE L'ÉNERGIE ÉOLIENNE (SCEE). U.P.B. Sci. Bull., Series C [Internet]. 2021;83 (1). Publisher's VersionAbstract

L'article décrit la conception et la mise en œuvre en temps réel d'une commande non linéaire appliquée à un système de conversion de l'énergie éolienne (SCEE). La commande backstepping a été mise en œuvre pour améliorer les performances du système de conversion éolienne basé sur un générateur synchrone à aimants permanents (PMSG) connecté au réseau. Deux convertisseurs statiques assurent la connexion au réseau et sont contrôlés par la modulation de largeur d'impulsion (MLI). L'algorithme de contrôle proposé assure un contrôle de vitesse adéquat pour extraire la puissance maximale. Une description détaillée des lois de contrôle du backstepping basées sur la technique de stabilité de Lyapunov a été exposée. Les résultats obtenus par l'application de cette approche ont clairement répondu aux exigences de robustesse et de suivi des références même dans des conditions de vent fluctuants, et ont confirmé l'efficacité d'un tel contrôle dans les modes de fonctionnement statique et dynamique.

ZARROUKI MBE, Benaggoune S, Abdessemed R. STRATÉGIE DE CONTRÔLE NON LINÉAIRE OPTIMISÉE POUR LE GÉNÉRATEUR SYNCHRONE À AIMANT PERMANENT (GSAP) DANS LE SYSTÈME DE CONVERSION DE L'ÉNERGIE ÉOLIENNE (SCEE). U.P.B. Sci. Bull., Series C [Internet]. 2021;83 (1). Publisher's VersionAbstract

L'article décrit la conception et la mise en œuvre en temps réel d'une commande non linéaire appliquée à un système de conversion de l'énergie éolienne (SCEE). La commande backstepping a été mise en œuvre pour améliorer les performances du système de conversion éolienne basé sur un générateur synchrone à aimants permanents (PMSG) connecté au réseau. Deux convertisseurs statiques assurent la connexion au réseau et sont contrôlés par la modulation de largeur d'impulsion (MLI). L'algorithme de contrôle proposé assure un contrôle de vitesse adéquat pour extraire la puissance maximale. Une description détaillée des lois de contrôle du backstepping basées sur la technique de stabilité de Lyapunov a été exposée. Les résultats obtenus par l'application de cette approche ont clairement répondu aux exigences de robustesse et de suivi des références même dans des conditions de vent fluctuants, et ont confirmé l'efficacité d'un tel contrôle dans les modes de fonctionnement statique et dynamique.

ZARROUKI MBE, Benaggoune S, Abdessemed R. STRATÉGIE DE CONTRÔLE NON LINÉAIRE OPTIMISÉE POUR LE GÉNÉRATEUR SYNCHRONE À AIMANT PERMANENT (GSAP) DANS LE SYSTÈME DE CONVERSION DE L'ÉNERGIE ÉOLIENNE (SCEE). U.P.B. Sci. Bull., Series C [Internet]. 2021;83 (1). Publisher's VersionAbstract

L'article décrit la conception et la mise en œuvre en temps réel d'une commande non linéaire appliquée à un système de conversion de l'énergie éolienne (SCEE). La commande backstepping a été mise en œuvre pour améliorer les performances du système de conversion éolienne basé sur un générateur synchrone à aimants permanents (PMSG) connecté au réseau. Deux convertisseurs statiques assurent la connexion au réseau et sont contrôlés par la modulation de largeur d'impulsion (MLI). L'algorithme de contrôle proposé assure un contrôle de vitesse adéquat pour extraire la puissance maximale. Une description détaillée des lois de contrôle du backstepping basées sur la technique de stabilité de Lyapunov a été exposée. Les résultats obtenus par l'application de cette approche ont clairement répondu aux exigences de robustesse et de suivi des références même dans des conditions de vent fluctuants, et ont confirmé l'efficacité d'un tel contrôle dans les modes de fonctionnement statique et dynamique.

Khalid F, Rabah M, Salah S, Hacene A. A Study of the Thermo-Mechanical Behavior of a Gas Turbine Blade in Composite Materials Reinforced with Mast A Study of the Thermo-Mechanical Behavior of a Gas Turbine Blade in Composite Materials Reinforced with Mast. Revue des Composites et des Matériaux Avancés [Internet]. 2021 :101-108. Publisher's VersionAbstract

The turbine blades are subjected to high operating temperatures and high centrifugal tensile stress due to rotational speeds. The maximum temperature at the inlet of the turbine is currently limited by the resistance of the materials used for the blades. The present paper is focused on the thermo-mechanical behavior of the blade in composite materials with reinforced mast under two different types of loading. The material studied in this work is a composite material, the selected matrix is a technical ceramic which is alumina (aluminum oxide Al2O3) and the reinforcement is carried out by short fibers of high modulus carbon to optimize a percentage of 40% carbon and 60% of ceramics. The simulation was performed numerically by Ansys (Workbench 16.0) software. The comparative analysis was conducted to determine displacements, strains and Von Mises stress of composite material and then compared to other materials such as Titanium Alloy, Stainless Steel Alloy, and Aluminum 2024 Alloy. The results were compared in order to select the material with the best performance in terms of rigidity under thermo-mechanical stresses. While comparing these materials, it is found that composite material is better suited for high temperature applications. On evaluating the graphs drawn for, strains and displacements, the blade in composite materials reinforced with mast is considered as optimum.

Khalid F, Rabah M, Salah S, Hacene A. A Study of the Thermo-Mechanical Behavior of a Gas Turbine Blade in Composite Materials Reinforced with Mast A Study of the Thermo-Mechanical Behavior of a Gas Turbine Blade in Composite Materials Reinforced with Mast. Revue des Composites et des Matériaux Avancés [Internet]. 2021 :101-108. Publisher's VersionAbstract

The turbine blades are subjected to high operating temperatures and high centrifugal tensile stress due to rotational speeds. The maximum temperature at the inlet of the turbine is currently limited by the resistance of the materials used for the blades. The present paper is focused on the thermo-mechanical behavior of the blade in composite materials with reinforced mast under two different types of loading. The material studied in this work is a composite material, the selected matrix is a technical ceramic which is alumina (aluminum oxide Al2O3) and the reinforcement is carried out by short fibers of high modulus carbon to optimize a percentage of 40% carbon and 60% of ceramics. The simulation was performed numerically by Ansys (Workbench 16.0) software. The comparative analysis was conducted to determine displacements, strains and Von Mises stress of composite material and then compared to other materials such as Titanium Alloy, Stainless Steel Alloy, and Aluminum 2024 Alloy. The results were compared in order to select the material with the best performance in terms of rigidity under thermo-mechanical stresses. While comparing these materials, it is found that composite material is better suited for high temperature applications. On evaluating the graphs drawn for, strains and displacements, the blade in composite materials reinforced with mast is considered as optimum.

Khalid F, Rabah M, Salah S, Hacene A. A Study of the Thermo-Mechanical Behavior of a Gas Turbine Blade in Composite Materials Reinforced with Mast A Study of the Thermo-Mechanical Behavior of a Gas Turbine Blade in Composite Materials Reinforced with Mast. Revue des Composites et des Matériaux Avancés [Internet]. 2021 :101-108. Publisher's VersionAbstract

The turbine blades are subjected to high operating temperatures and high centrifugal tensile stress due to rotational speeds. The maximum temperature at the inlet of the turbine is currently limited by the resistance of the materials used for the blades. The present paper is focused on the thermo-mechanical behavior of the blade in composite materials with reinforced mast under two different types of loading. The material studied in this work is a composite material, the selected matrix is a technical ceramic which is alumina (aluminum oxide Al2O3) and the reinforcement is carried out by short fibers of high modulus carbon to optimize a percentage of 40% carbon and 60% of ceramics. The simulation was performed numerically by Ansys (Workbench 16.0) software. The comparative analysis was conducted to determine displacements, strains and Von Mises stress of composite material and then compared to other materials such as Titanium Alloy, Stainless Steel Alloy, and Aluminum 2024 Alloy. The results were compared in order to select the material with the best performance in terms of rigidity under thermo-mechanical stresses. While comparing these materials, it is found that composite material is better suited for high temperature applications. On evaluating the graphs drawn for, strains and displacements, the blade in composite materials reinforced with mast is considered as optimum.

Khalid F, Rabah M, Salah S, Hacene A. A Study of the Thermo-Mechanical Behavior of a Gas Turbine Blade in Composite Materials Reinforced with Mast A Study of the Thermo-Mechanical Behavior of a Gas Turbine Blade in Composite Materials Reinforced with Mast. Revue des Composites et des Matériaux Avancés [Internet]. 2021 :101-108. Publisher's VersionAbstract

The turbine blades are subjected to high operating temperatures and high centrifugal tensile stress due to rotational speeds. The maximum temperature at the inlet of the turbine is currently limited by the resistance of the materials used for the blades. The present paper is focused on the thermo-mechanical behavior of the blade in composite materials with reinforced mast under two different types of loading. The material studied in this work is a composite material, the selected matrix is a technical ceramic which is alumina (aluminum oxide Al2O3) and the reinforcement is carried out by short fibers of high modulus carbon to optimize a percentage of 40% carbon and 60% of ceramics. The simulation was performed numerically by Ansys (Workbench 16.0) software. The comparative analysis was conducted to determine displacements, strains and Von Mises stress of composite material and then compared to other materials such as Titanium Alloy, Stainless Steel Alloy, and Aluminum 2024 Alloy. The results were compared in order to select the material with the best performance in terms of rigidity under thermo-mechanical stresses. While comparing these materials, it is found that composite material is better suited for high temperature applications. On evaluating the graphs drawn for, strains and displacements, the blade in composite materials reinforced with mast is considered as optimum.

Kadache N, Seghir R. A New Social Volunteer Computing Environment With Task-Adapted Scheduling Policy (TASP). International Journal of Grid and High Performance Computing (IJGHPC) [Internet]. 2021;13 (2) :39-55. Publisher's VersionAbstract

Volunteer computing (VC) has become a relatively mature technique of distributed computing. It is based on exploiting the idle time of ordinary online machines with the consent of their owners. Target applications are generally scientific projects requiring a huge amount of computational resources. Existing VC platforms raise several challenges. This work attempts to bring solutions for two defeats. The first one is the involvement of volunteers; the decreasing of participants affects the global performances. To cope with this, a new social volunteer computing environment is proposed in order to involve more volunteers. The second addressed problem is the task scheduling, which aims to optimize the use of resources. The proposed algorithm generates for each resource's class, a number of tasks whose cost of execution reflects the momentary capacity of the resources. The new solutions are validated through a theory of number's project, called “Collatz Conjecture.”

Kadache N, Seghir R. A New Social Volunteer Computing Environment With Task-Adapted Scheduling Policy (TASP). International Journal of Grid and High Performance Computing (IJGHPC) [Internet]. 2021;13 (2) :39-55. Publisher's VersionAbstract

Volunteer computing (VC) has become a relatively mature technique of distributed computing. It is based on exploiting the idle time of ordinary online machines with the consent of their owners. Target applications are generally scientific projects requiring a huge amount of computational resources. Existing VC platforms raise several challenges. This work attempts to bring solutions for two defeats. The first one is the involvement of volunteers; the decreasing of participants affects the global performances. To cope with this, a new social volunteer computing environment is proposed in order to involve more volunteers. The second addressed problem is the task scheduling, which aims to optimize the use of resources. The proposed algorithm generates for each resource's class, a number of tasks whose cost of execution reflects the momentary capacity of the resources. The new solutions are validated through a theory of number's project, called “Collatz Conjecture.”

2020
Diab L, Bahloul A. The Generic Structure Of The Conclusion Section In The Algerian Linguistics Research Articles Published In English. Revue des sciences humaines de l'université Oum El Bouaghi [Internet]. 2020;7 (3) :1554-1567. Publisher's VersionAbstract

The emergence of the genre tradition contributed a lot in improving and facilitating the academic writing process for EFL researchers. One of the first genres that received much attention is the research article with its different sections. Accordingly, the present study aims at revealing the generic or rhetorical structure of some Algerian research articles conclusion section written in the field of linguistics. In other words, it attempts to investigate the structural organization of the conclusion section written by Algerian researchers. The study used Yang and Allison’s (2003) move framework to analyze the research articles conclusion. In order to carry out this study we adopted a genre analysis approach to academic texts. Fourteen (14) research articles conclusions, written in English in the field of linguistics, were analyzed in this study. The research articles were published in the scientific journal ‘Language and Translation’. The findings of the study showed that the Algerian linguistic research articles conclusions written in English seemed to violate the model suggested by Yang and Allison (2003). That is because only one move appeared in the whole corpus with total absence of some moves and steps. In addition, the study unveiled the structure of these conclusions following the obtained results. Finally, the study puts some recommendations and might have some pedagogical implications. Key Terms: EFL researchers, Genre, Structural, Move Analysis, Step

Diab L, Bahloul A. The Generic Structure Of The Conclusion Section In The Algerian Linguistics Research Articles Published In English. Revue des sciences humaines de l'université Oum El Bouaghi [Internet]. 2020;7 (3) :1554-1567. Publisher's VersionAbstract

The emergence of the genre tradition contributed a lot in improving and facilitating the academic writing process for EFL researchers. One of the first genres that received much attention is the research article with its different sections. Accordingly, the present study aims at revealing the generic or rhetorical structure of some Algerian research articles conclusion section written in the field of linguistics. In other words, it attempts to investigate the structural organization of the conclusion section written by Algerian researchers. The study used Yang and Allison’s (2003) move framework to analyze the research articles conclusion. In order to carry out this study we adopted a genre analysis approach to academic texts. Fourteen (14) research articles conclusions, written in English in the field of linguistics, were analyzed in this study. The research articles were published in the scientific journal ‘Language and Translation’. The findings of the study showed that the Algerian linguistic research articles conclusions written in English seemed to violate the model suggested by Yang and Allison (2003). That is because only one move appeared in the whole corpus with total absence of some moves and steps. In addition, the study unveiled the structure of these conclusions following the obtained results. Finally, the study puts some recommendations and might have some pedagogical implications. Key Terms: EFL researchers, Genre, Structural, Move Analysis, Step

Belouz S, Boubakour S. Lecture Mythique Des Désorientés D’amin Maalouf. El-Tawassol [Internet]. 2020;25 (1) :195-206. Publisher's VersionAbstract

Mythe et littérature ont toujours entretenu des relations complexes, qui ont été étudiées selon diverses approches. L’objectif du présent article est de présenter une analyse, sous l’angle mythique, des Désorientés d’Amin Maalouf, où l’exil sera mis en exergue en tant que thème fondateur de l’écriture maaloufienne ; le roman sera lu à travers le mythe d’Ulysse qui a voué son existence pour retourner auprès des siens. A travers la mythocritique durandienne, qui reste fondamentalement symbolique, nous établirons le parallèle d’une part, entre le récit maaloufien et le récit homérique, et d’autre part entre l’exil en tant que perte de la patrie et le vécu de l’auteur et la situation historique et sociale du Liban.

Belouz S, Boubakour S. Lecture Mythique Des Désorientés D’amin Maalouf. El-Tawassol [Internet]. 2020;25 (1) :195-206. Publisher's VersionAbstract

Mythe et littérature ont toujours entretenu des relations complexes, qui ont été étudiées selon diverses approches. L’objectif du présent article est de présenter une analyse, sous l’angle mythique, des Désorientés d’Amin Maalouf, où l’exil sera mis en exergue en tant que thème fondateur de l’écriture maaloufienne ; le roman sera lu à travers le mythe d’Ulysse qui a voué son existence pour retourner auprès des siens. A travers la mythocritique durandienne, qui reste fondamentalement symbolique, nous établirons le parallèle d’une part, entre le récit maaloufien et le récit homérique, et d’autre part entre l’exil en tant que perte de la patrie et le vécu de l’auteur et la situation historique et sociale du Liban.

Houamed H, Saidi L, Srairi F. ECG signal denoising by fractional wavelet transform thresholding. Research on Biomedical Engineering [Internet]. 2020;36 :349–360. Publisher's VersionAbstract

Introduction

The analysis of electrocardiogram (ECG) signals allows experts to diagnose several cardiac disorders. However, the accuracy of such diagnosis depends heavily on the signal quality. In this paper, an efficient method based on fractional wavelet decomposition coupled with thresholding techniques is proposed for noise removal.

Methods

The usual low-pass and high-pass filters of the wavelet transform are replaced by fractional-order ones. Thus, fractional wavelets are proposed, simulated, and compared to other wavelets for ECG denoising. The denoising process was made operational by the means of an appropriate choice of the wavelet transform coefficient thresholding and the wavelet decomposition level of the signal.

Results

Considering the relative error metrics, the best wavelet function for efficient denoising is the fractional one. In our study, we have used eight real ECG signals from the Physionet MITBIH. In order to prove the effectiveness of our method, we investigated the filtering of two types of noises, namely Gaussian white noise and power-line interference (PLI) noise. The proposed method removed the Gaussian white noise completely and had better performance on the PLI noise. Considering classical metrics of assessment, results show the advantage of the proposed method compared to other types of wavelets.

Conclusion

The proposed method is the most suitable one for removing PLI and Gaussian white noise from ECG signals with superior performance than other wavelets. Also, it can be applied for high-frequency denoising even without a priori frequency knowledge.

Houamed H, Saidi L, Srairi F. ECG signal denoising by fractional wavelet transform thresholding. Research on Biomedical Engineering [Internet]. 2020;36 :349–360. Publisher's VersionAbstract

Introduction

The analysis of electrocardiogram (ECG) signals allows experts to diagnose several cardiac disorders. However, the accuracy of such diagnosis depends heavily on the signal quality. In this paper, an efficient method based on fractional wavelet decomposition coupled with thresholding techniques is proposed for noise removal.

Methods

The usual low-pass and high-pass filters of the wavelet transform are replaced by fractional-order ones. Thus, fractional wavelets are proposed, simulated, and compared to other wavelets for ECG denoising. The denoising process was made operational by the means of an appropriate choice of the wavelet transform coefficient thresholding and the wavelet decomposition level of the signal.

Results

Considering the relative error metrics, the best wavelet function for efficient denoising is the fractional one. In our study, we have used eight real ECG signals from the Physionet MITBIH. In order to prove the effectiveness of our method, we investigated the filtering of two types of noises, namely Gaussian white noise and power-line interference (PLI) noise. The proposed method removed the Gaussian white noise completely and had better performance on the PLI noise. Considering classical metrics of assessment, results show the advantage of the proposed method compared to other types of wavelets.

Conclusion

The proposed method is the most suitable one for removing PLI and Gaussian white noise from ECG signals with superior performance than other wavelets. Also, it can be applied for high-frequency denoising even without a priori frequency knowledge.

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