M. DJALAB Abdelhakim

MCA

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Department

DEPARTEMENT OF: ELECTRICAL ENGINEERING

Research Interests

Tribologie

Contact Info

University of M'Sila, Algeria

Email : abdelhakim.djalab@univ-msila.dz

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Recent Publications

2024-12-18

Stabilizing fuzzy controller design for quarter-vehicle suspension system

The primary aim of a vehicle's suspension system is to isolate the vehicle's main body from road irregularities, thus improving passenger comfort and ensuring optimal handling stability. This research discusses a stabilizing fuzzy control design for active vehicle suspension systems. The nonlinear model of the active suspension is then represented using a Takagi-Sugeno (TS) fuzzy model. The control approach uses a TS fuzzy controller utilizing an observer to estimate the state while reducing road disturbances. The closed-loop stability requirements of the vehicle utilizing the fuzzy controller and observer are expressed as a Linear Matrix Inequalities (LMI) problem, which can be effectively resolved through convex optimization methods. In this paper, we study the stability of the nonlinear automotive active suspension system with two degrees of freedom represented by a TS fuzzy model, where we will present the stabilization conditions by state feedback via the PDC (Parallel Distributed Compensation) control law and in the last section we introduced the TS fuzzy observer for the case of non-measurable premise variables.
Citation

M. DJALAB Abdelhakim, (2024-12-18), "Stabilizing fuzzy controller design for quarter-vehicle suspension system", [international] Studies in Engineering and Exact Sciences , Erih plus

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2024-12-06

New Lyapunov backstepping control of the mechanical power generated by an induction motor

This paper presents a new Lyapunov backstepping control law (LBC) that makes it possible to control the mechanical power generated by an induction motor (IM), while guaranteeing its robustness and stability. This induction motor is supplied by the stator variables via two converters. One, a mains converter (two-level rectifier), facilitates the control of the direct courant (DC) bus and improves the mains power factor; the other, a motor converter (two-level inverter), enables precise control and optimisation of the energy flow during motor operation. In the first part, we presented the modelling of our motor and its converters. In the second part, we presented the control structure proposed to control and optimise the mechanical energy generated by our motor (speed, torque) to achieve optimum efficiency and transfer quality. The results of the numerical simulations demonstrate the effectiveness of the new Lyapunov control system in achieving these objectives, i.e. mechanical speed outside its references and electromagnetic torque below the nominal torque.
Citation

M. DJALAB Abdelhakim, (2024-12-06), "New Lyapunov backstepping control of the mechanical power generated by an induction motor", [international] Studies in Engineering and Exact Sciences , Erih plus

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2024-11-17

MHD Of 𝑻𝒊𝑶𝟐 − 𝑬𝑮 Flow Between Convergent-Divergent Channel With Velocity Slip And Nanoparticles Aggregation

The present study investigates the combined effects of Velocity Slip and Nanoparticles aggregation on Heat transfer analysis of MHD nanofluid (ie. 𝑻𝒊𝑶 − 𝑶 ) flow between porous convergent divergent channel. The modified Krieger–Dougarty and Maxwell–Bruggeman models were utilized to nanoparticle aggregation. The modeling based on nonlinear PDEs such as continuity, momentum and heat equations, these equations transformed to a system of nonlinear ODEs using similarity transformations then solved numerically and analytically, the analytical solution has been constructed using by ADM method, the present results in particular cases are compared to results obtained by the HAMpackage and by the Runge- Kutta Fehlberg 4th–5th order (RKF-45) for validation. The effects of active parameters on the velocity, temperature and concentration, skin friction and Nusselt numbers are investigated.
Citation

M. DJALAB Abdelhakim, (2024-11-17), "MHD Of 𝑻𝒊𝑶𝟐 − 𝑬𝑮 Flow Between Convergent-Divergent Channel With Velocity Slip And Nanoparticles Aggregation", [national] The 8th National Colloquium on Inductics : University – Industry , M’sila, Algeria

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L’effet de la présence des particules polluantes sur les surfaces en contact tribologique

Il est désormais bien établi qu'une particule solide en suspension dans un lubrifiant, lorsqu'elle traverse un contact mécanique, peut entraîner une dégradation rapide des composants des machines. Nous nous sommes particulièrement intéressés à la dégradation des contacts roulants, notamment ceux entre galets cylindriques. L'étude présentée s'est principalement concentrée sur l'évolution de la rugosité de surface Ra (état de surface) en fonction de divers paramètres de fonctionnement, tels que la charge, la vitesse, le temps, la concentration de contaminants, etc. Ce document expose les résultats d'une investigation expérimentale sur la dégradation des contacts EHD dans des conditions de contamination extrême, en présence de sable. L'analyse statistique des résultats permet d'établir une relation fonctionnelle entre le paramètre y (paramètres de sortie) et les facteurs xi (paramètres d'entrée). L'objectif principal de cette étude est d'expliquer les raisons de la réduction de la durée de vie des mécanismes dans un environnement contaminé.
Citation

M. DJALAB Abdelhakim, (2024-11-17), "L’effet de la présence des particules polluantes sur les surfaces en contact tribologique", [national] The 8th National Colloquium on Inductics : University – Industry , M’sila, Algeria

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2024-10-16

Influence of operating parameters on the fatigue life of materials: a combined experimental and statistical study

Today, material fatigue is a crucial area of modern engineering because it has a
major impact on the durability and reliability of mechanical components in many
industrial systems. The understanding of fatigue mechanisms and their behaviour
under different operating conditions is essential for the design of robust and
durable systems. This experimental study focuses on the fatigue behaviour
resulting from rotational bending of nationally produced materials. The main
elements are the determination of the fatigue limit for a given fatigue cycle and the
endurance limit. To characterise the fatigue resistance of the material by testing a
group of identical specimens subjected to cycles of a given shape. To study the
effect of three operational variables, namely hardness (H), surface roughness (Ra)
and applied stress (σ), on the response under investigation, i.e. the life of the
specimen (number of cycles), experiments were carried out using a Taguchi L18
mixed experimental set. Finally, the results obtained were statistically analysed
using analysis of variance (ANOVA) and response surface methodology (RSM).
From the experimental results and the analyses carried out, the results show that
the applied stress is the statistically most dominant factor on specimen fatigue (life)
with a contribution of 38.53%, followed by the stiffness factor with a contribution of
32.81%. Finally, based on the Taguchi method and the Response Surface Model
(RSM) developed, it is judged that the higher value obtained for the coefficient of
determination (over 80%) clearly shows the strong correlation between predicted
and experimental data.
Citation

M. DJALAB Abdelhakim, (2024-10-16), "Influence of operating parameters on the fatigue life of materials: a combined experimental and statistical study", [international] Studies in Engineering and Exact Sciences , Erih plus

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2024-10-13

3D flow of Casson hybrid nanofluid under thermal radiation and shape factors

This study investigates the 3 flow characteristics of a tetra hybrid nanofluid over a stretching sheet,while accounting for thermal radiation and shape factors (i.e Sphere, Column and Lamina) and Casson base liquid (i.e Blood) effects is presented in this work. In this situation both nanoparticles are considered (i.e. and ). We derive nonlinear ODEs from the governing nonlinear PDEs utilizing the similarity transformations. The model's performance is assessed through both numerical and analytical solutions, the analytical solution has been constructed using using the Adomian Decomposition Method (ADM) and numerical using the Explicit Runge Kutta Method (ERKM) illustrating the impact of key parameters on velocity, temperature profiles, skin friction and Nusselt numbers. The present results in particular cases are compared both numerical and analytical results.
Citation

M. DJALAB Abdelhakim, (2024-10-13), "3D flow of Casson hybrid nanofluid under thermal radiation and shape factors", [national] 1er Séminaire National : Eau, Environnement et Energies renouvelables (SN3ER’24) , M’sila, Algeria

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2024-10-12

Étude Expérimentale des Effets des Contaminants solides sur les Propriétés Tribologiques des Matériaux

L'effet des particules solides sur la dégradation des surfaces de contact a fait l'objet de nombreuses études ces dernières années. En effet, la présence de ces particules indésirables entre
deux corps en mouvement relatif peut endommager les surfaces et conduire à la destruction complète des mécanismes. Dans le présent travail, nous nous intéressons à comprendre, d'une part, l'effet de la contamination solide de la lubrification sur les surfaces en contact roulant (contact entre galets cylindriques) et, d'autre part, l'influence des paramètres de fonctionnement tels que : charge, vitesse, type de contact, ... etc, sur le comportement tribologique des pièces mécaniques (évolution des pertes de côte (usure)). Dans la deuxième étape, une étude statistique de l'effet des paramètres de fonctionnement (charge, type de contact, vitesse) sur la dégradation mécanique du contact est réalisée à l'aide de la méthodologie de surface de réponse (MSR) et de l'analyse de variance (ANOVA).
Enfin, les résultats obtenus par cette étude, justifie les raisons de réduction de la durée de vie des mécanismes dans un milieu pollué.
Citation

M. DJALAB Abdelhakim, (2024-10-12), "Étude Expérimentale des Effets des Contaminants solides sur les Propriétés Tribologiques des Matériaux", [national] Séminaire Sur La Technologie Et L’industrie , Tlemcen, Algeria

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2024-07-19

Statistical Analysis of Wear in Contaminated Dry Rolling Contacts

It is well-established that the presence of solid particles between contacting surfaces can significantly degrade the lifetime of machine components. This study focuses on investigating the failure of dry rolling contacts under the influence of solid contaminants. To achieve this, the researchers conducted experiments using a custom experimental setup that closely represents the real operating conditions of gears or roller bearings. Specifically, the dry rolling contact tests were carried out using the contact between two steel disks. In order to examine the influence of three operating variables - particle size (S), rotational speed (V), and load (Q) - on the studied response, which was wear (W), the Taguchi L9 orthogonal array was utilized. The analysis of the obtained experimental results was performed using both response surface methodology (RSM) and analysis of variance (ANOVA) techniques. The results revealed that particle size (S) was the dominant factor affecting the wear of the contaminated dry rolling contact, contributing 59.93% to the observed wear. Furthermore, the developed RSM models for wear demonstrated a strong correlation between the predicted and experimental data, with determination coefficients exceeding 75
Keywords: dry rolling contact, solid particles, Taguchi technique, wear, Statistical Analysis
Citation

M. DJALAB Abdelhakim, (2024-07-19), "Statistical Analysis of Wear in Contaminated Dry Rolling Contacts", [international] 12th International Conference on Applied Analysis and Mathematical Modeling, 2024 (ICAAMM 2024), Istanbul, Turkey , Istanbul, Turkey

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2023-11-25

The Effect Of The Type Of Cooling On Tensile Stresses İn Lead Metal

In the field of mechanical manufacturing, the casting process is considered the most important process in making complex parts. We use several alloys to obtain the final product that matches the properties we want. However, when this process is inaccurate, it may have some defects. Such as the holes observed on the metal structure, which result from nitrogen gas, which contributes to reducing the density of manufactured parts. In this research, we study the effect of changing the density value of lead metal on the value of the mechanical stresses applied to it. This change in density is the result of the increase in the number of holes resulting from the cooling process. Inside a scientific laboratory, we conduct our experiments on samples measuring 20 × 5 × 5 cm3. We cool molten lead in three ways: air, water and oil .The results show that the density of lead changes between 2.4% and 3.7%. The mechanical
tension value on the samples changes between 12.6% and 17.3%. These results enable us to understand the relationship between density, type of cooling, and the tensile strength of the metal.
Keywords : Casting . Metal. Density .Mechanical stresses.
Citation

M. DJALAB Abdelhakim, Benfredj Amal, Fidjah Abdelkader, et al, , (2023-11-25), "The Effect Of The Type Of Cooling On Tensile Stresses İn Lead Metal", [international] BİLSEL INTERNATIONAL HARPUT SCIENTIFIC RESEARCHES CONGRESS, 25-26 NOVEMBER, 2023 , ELAZIĞ/TÜRKİYE

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2023-10-11

Study the effects of the presence of contaminant particles in mechanical contact

The effect of solid particles on the degradation of contact surfaces has been the subject of numerous studies in recent years. In fact, the presence of these unwanted particles between two bodies in relative motion can damage surfaces and lead to complete destruction of mechanisms. Indeed, we are particularly interested in the degradation of the rolling contact (contact between cylindrical rollers). The study presented was mainly devoted to the evolution of temperature, wear and surface roughness Ra (the surface condition) as a function of operating parameters such as load, speed, time and pollutant concentration, etc. For the contact: 100C6 steel bearing and C45 steel specimen. The processing of the results obtained also made it possible to deduce mathematical models of wear and roughness according to the parameters studied. Finally, the results obtained by this study justify the reasons for reducing the lifetime of the mechanisms in a polluted environment.
Keywords: Contact - Solid Pollution - Wear - mathematical model - surface roughness
Citation

M. DJALAB Abdelhakim, (2023-10-11), "Study the effects of the presence of contaminant particles in mechanical contact", [international] 6th International Conference on Recent Trends in Multi-Disciplinary Research (ICRTMDR-23) , Istanbul, Turkey

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2023-07-11

Effet des contaminants du sable sur l'usure des contacts élastohydrodynamiques

Dans cette étude expérimentale, nous avons tenté de répondre à des questions concernant l'influence des particules solides présentes dans les lubrifiants sur le contact mécanique. En effet, nous nous intéressons particulièrement à l'évolution de la température de fonctionnement et à l'usure des contacts roulants EHD. L'objectif principal de cette étude est d'élucider les causes de la durée de vie mécanique réduite dans des milieux pollués.
Mots-clés: Contact - Pollution solide - Lubrification – Température - Usure.
Citation

M. DJALAB Abdelhakim, (2023-07-11), "Effet des contaminants du sable sur l'usure des contacts élastohydrodynamiques", [international] 4th International Conference of Mechanics and Materials ICMM’2023 , Université farhat abbas 1 Setif

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2023-03-12

Theoretical study and DFT calculations of optoelectronic proprieties of Audoped Cu2O

Cu2O is a semiconductor material largely used in electronics filed, especially in advanced solar cells. In order to improve its proprieties, theoretical calculations of the optical and electrical properties of Au-doped Cu2O was carried out in this work through the BIOVIA materials studio by the CASTEP code, which is based on the Functional Density Theory (DFT), the PDOS (Partial Density Of States) calculations of the copper and the oxygen atoms in the cuprite Cu2O material proved that the doping of the copper atom in the cuprite has a very large influence on its optoelectronic properties than the doping of oxygen one. The increase of the replacing percentage of the copper by the gold increases improvement of these properties (permittivity, conductivity, reflectivity and absorption).The (75 %) partial replacement of copper by gold (Cu0.25Au0.75O2) leads to a significant improvement in its band structure where we find it decreasing from 2.3 to becoming 1.2 eV.
Keywords: Cu2O, solar energy, DFT, optoelectronic properties, semiconductors, doping.
Citation

M. DJALAB Abdelhakim, (2023-03-12), "Theoretical study and DFT calculations of optoelectronic proprieties of Audoped Cu2O", [national] 3 rd National Conference on Applied Physics & Chemistry (3rdNCAPC23) , Normal School of Laghouat (ENSL)

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2022

Investigating the structural, electronic, and optical properties of novel ZnO-based materials

The main objective of this present work is to theoretically study new semiconductor materials based on zinc oxide ZnO, namely the structures of the crystal lattice, the structure of electronic bands, and the general optical characteristics using the code castep (Biovia Material Studio) which is based on density functional theory DFT. The results obtained proved that the theoretical calculations of the optical and structural properties are very close to the experimental results (gap energy, optical conductivity, etc.), and also showed that the partial replacement of Zinc by titanium in the oxide of zinc leads to a significant improvement in its optoelectronics properties.
Keywords: Zinc Oxide (ZnO), Ti, DFT, CASTEP, GGA, Optoelectronics properties.
Citation

M. DJALAB Abdelhakim, (2022), "Investigating the structural, electronic, and optical properties of novel ZnO-based materials", [international] 2nd International seminar on industrial engineering and applied mathematics , Université 20 Août 1955-Skikda

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2021

Étude de l'effet du dopage sur les propriétés optiques d'un matériau semi-conducteur

Un semi-conducteur est un corps cristallin dont les propriétés de conductivité électrique sont intermédiaires entre celles des isolants et des conducteurs, elles varient sur plusieurs ordres de grandeur, sous l'effet de la température, l'éclairement, la présence d'impuretés (dopage). L’oxyde de zinc (ZnO) est un semi-conducteur présent des propriétés électriques et optiques intéressantes.
Ce présent travail a pour objectif principal d’étudier théoriquement de nouveaux matériaux semi –conducteurs à base de l’oxyde de zinc ZnO, à savoir les structures du réseau cristallin, la structure de bandes électroniques, et les caractéristiques optiques générales en utilisant le code castep (logiciel materials studio) qui est basé sur la théorie de la densité fonctionnelle DFT. Les résultats obtenus ont prouvé que les calculs théoriques des propriétés optiques et structurelles sont très proches des résultats expérimentaux (énergie de gap, conductivité optique....etc), et montré également que le remplacement partiel du Zinc par de l'argent dans l’oxyde de zinc conduit à une amélioration significative de ses propriétés optoélectronique où
l'énergie de gap devient proche de 1 eV.
Citation

M. DJALAB Abdelhakim, (2021), "Étude de l'effet du dopage sur les propriétés optiques d'un matériau semi-conducteur", [international] 1ere Conférence Internationanle sur les procédés industriels et la conservation environnementale , Université 20 Août 1955-Skikda

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2017

Dégradation des contacts mécaniques secs dans les milieux pollués

Dans ces dernières années, l'effet des particules solides sur la dégradation des surfaces en contact a fait l'objet de nombreuses études. En effet, la présence de ces particules indésirables entre deux corps en mouvement relatif, peut endommager les surfaces et conduire à la destruction totale des mécanismes.
Ce travail s’intéresse principalement aux effets de la pollution solide sur la dégradation des contacts purement secs, se traduisant par l’évolution de l’usure, et de la température de fonctionnement.
Citation

M. DJALAB Abdelhakim, (2017), "Dégradation des contacts mécaniques secs dans les milieux pollués", [international] La 4ième Conférence Internationale sur la Maintenance et la Sécurité Industrielle , Université 20 Août 1955-Skikda

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2016

Mathematical Modeling and Statistical Analysis of Wear and Surface Roughness in Contaminated Dry Rolling Contacts

Nowadays, it is well established that the degradation caused by the presence of solid particles between the contacting surfaces can severely reduce the lifetime of machine components. This study focuses on the failure of a dry rolling contact under the effect of solid contaminants. To achieve this goal, experiments have been conducted on an original experimental set-up which represents the real operating conditions of gears or roller bearings. In fact, dry rolling contact tests are carried out using the contact between two steel disks. In order to investigate the influence of three operating variables which are: Particles size (S), Rotational speed (V) and Load (Q) on the studied responses (i.e. wear (W) and surface roughness (Ra)), the Taguchi L9 orthogonal array was adopted. The analysis of the obtained experimental results is achieved using both response surface methodology (RSM) and analysis of variance (ANOVA) techniques. The results display that the particles size (S) is the dominant factor affecting the wear of a contaminated dry rolling contact (S: 59,93%), whereas it is found that the applied load (Q) has the most significant effect on the surface roughness (Ra) (Q: 69,94%). Finally, from developed RSM models of wear and surface roughness, it is judged that the obtained higher values of determination coefficient (more than 75%) show clearly the high correlation between the predicted and experimental data.
Citation

M. DJALAB Abdelhakim, (2016), "Mathematical Modeling and Statistical Analysis of Wear and Surface Roughness in Contaminated Dry Rolling Contacts", [national] Journal of the Balkan Tribological Association , Scientific Bulgarian Communications

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2015

Modélisation mathématique de l’usure et de la rugosité de surface d'un contact roulants dans un milieu pollué

L’effet de la pollution solide des lubrifiants est le centre d’intérêt de nombreuses études dans ces dernières années. En effet, la présence des particules polluantes dans les contacts mécaniques est inévitable.
La corrélation, pour sa part, définit un indice permettant de mesurer le degré de liaison ou l'intensité de la relation entre deux variables [1].
Dans ce travail, nous introduisons d'abord le modèle de régression linéaire simple, puis son estimation par la méthode des moindres carrés. Nous étendons ensuite l'analyse à la régression multiple avant de conclure par l'analyse de corrélation des modèles d'usure et de rugosité.
Citation

M. DJALAB Abdelhakim, (2015), "Modélisation mathématique de l’usure et de la rugosité de surface d'un contact roulants dans un milieu pollué", [international] La 3ième Conférence Internationale sur la Maintenance et la Sécurité Industrielle , Université 20 Août 1955-Skikda

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