génie Mécanique

Permanent URI for this collectionhttps://dspacee.univ-temouchent.edu.dz/handle/123456789/765

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Etude énergétique des cycles de puissance à changement de phase
(2025) DAMOU, KOUIDER; MEDJIDI, AYMEN IMAD EDDINE; HARCHOUCHE, Zine el abidine
The energy analysis of phase-change power cycles aims to analyze and optimize the heat exchanges and energy transformations associated with the vaporization and condensation of the working fluid, with the objective of improving the overall efficiency and performance of thermodynamic systems such as Rankine cycles. Organic Rankine Cycles (ORC), which are variants of traditional steam Rankine cycles using water, are employed when the heat source available for mechanical power generation is of low or medium temperature. The process was modeled using the DWSIM software and validated through a series of simulations. A sensitivity analysis was then conducted to assess the impact of variations in operating conditions—specifically steam flow rate, inlet temperature, and pressure—on the efficiency of the Rankine reheat cycle. The effect of the working fluid’s phase changes on cycle VI performance was also investigated. For optimization, the Design-Expert software was used, applying a Central Composite Design (CCD) combined with quadratic, linear, and 2FI regression models. Three input parameters were considered: steam mass flow rate, inlet temperature, and pressure. The responses analyzed were the isentropic efficiency and the net power output of the cycle. Consequently, this study adopts an integrated approach combining process simulation using DWSIM and optimization via the Response Surface Methodology (RSM), with the goal of simultaneously improving power output and overall efficiency of the Rankine reheat cycle.
Comportement dynamique d’un tube fonctionnellement gradué
(2025) BOUHAMIDI, AMIRA; TALHA, Zakaria; SAIMI, Ahmed
In this thesis, an in-depth numerical study is conducted on the free vibrational analysis and static bending of tubes made from functionally graded materials (FGM), taking into account porosity properties under the influence of thermal variations. The power-law is used to model the gradation of FGM materials, while a nonlinear temperature distribution is adopted to better reflect real-world conditions. This work is based on two classical beam theories: Euler-Bernoulli theory and Timoshenko theory, allowing for a comparative analysis of mechanical behavior. The equations of motion are derived by applying Lagrange’s principle through two distinct methods: a numerical method based on classical finite elements and an analytical approach using the Galerkin method. The natural frequencies are then calculated by solving the eigenvalue problem, considering various influencing parameters such as the FGM tube geometry, the power-law index associated with material gradation, temperature variations, porosity index, and different combinations of FG materials. This research aims to provide a deeper understanding of the vibrational and mechanical performance of FGM structures in complex environments.
Analyse numérique tridimensionnelle du comportement thermique d'un échangeur de chaleur à tube spiralé équipé de chicanes
(2025) MAGHRAOUI, Fatna Loudjine; BOUHASSIDA, Souad Nourelhane; BENZENINE, Hamidou
Heat exchangers are essential engineering devices widely used across various industrial sectors to facilitate heat transfer between two fluids In this study, a shell-and-tube heat exchanger is taken as the reference model. A numerical investigation was carried out using ANSYS Fluent software on two spiral tube heat exchanger configurations with identical outer dimensions. The first configuration features a simple spiral tube design, while the second includes five baffles, added to enhance heat transfer performance. The study focuses on the variation of outlet temperature with respect to fluid velocity, with a comparative analysis between the two models.
Analyse de l'influence de la rigidité des patchs composites sur la résistance en fatigue des plaques réparées en alliage d'aluminium 6061-T6
(2025) BENTOUILA, Mohammed Said; BOURAS, Reda mohamed Riad; Bahram, Kaddour
The durability of materials subjected to repeated cyclic loading is a major challenge, particularly in industrial sectors. Composite patch repairs are used to extend their service life, but their effectiveness depends on factors such as patch rigidity, overload ratio, and adhesive properties. This study explored the influence of repair patch rigidity, cyclic overload, and adhesive types on the fatigue life of the 6061-T6 aluminum alloy. Simulations were conducted with patches of varying rigidity (80%, 100%, 120%, 140%), overload ratios ranging from 1.5 to 3.5, and three different adhesive types (Graphite/Epoxy, Boron/Epoxy, Glare). The main objective was to measure the impact of these factors on crack propagation rate and the lifespan of the repaired material. The results show that a patch with 140% rigidity (relative to the substrate) delays cracking the most, increasing the lifespan by 40%. A moderate overload ratio (t=2.5) slows crack propagation by 25%, while excessive overload (t=3.5) prematurely damages the repair. Finally, the Graphite/Epoxy adhesive stands out, improving durability by 30-50% compared to other tested adhesives due to its resistance to delamination. These insights guide the development of optimized repair strategies for demanding industrial environments.
Etude technico-économique d’un système de ventilation solaire photovoltaïque
(2025) KADRI, Mohamed Aimen; KADID, Abderrahmane Farouk; HADJ, Abderrahmane Fayçal; BENSAAD, bourassia
Solar ventilation represents an innovative and sustainable solution for improving thermal comfort and indoor air quality while reducing building energy consumption. This thesis explores solar ventilation as an innovative solution to improve thermal comfort and indoor air quality while contributing to energy efficiency in buildings. It presents the basic principles of ventilation, its different types (natural, mechanical, and hybrid), before focusing on solar ventilation and its main components: fans, photovoltaic panels, batteries, charge controllers, etc A dimensioning methodology is developed through a concrete case study in a classroom in Algeria, allowing for the assessment of air flow requirements, fan power, and the design of an adapted photovoltaic installation. Finally, a market study and a business model are proposed for the creation of a startup specializing in the sale and installation of solar ventilation systems. The analysis shows that this technology is not only enviro
Conception et analyse de prothèse de hanche de type spacer
(2025) MEHALLI, MOUHAMED ABDELRAHMEN; BELHADJI, MEHDI; SALAH, Hichem
This thesis focuses on the mechanical study of a temporary hip prosthesis, known as a spacer, used primarily in two-stage treatments for periprosthetic infections. Typically made of bone cement (PMMA), this type of implant exhibits low mechanical strength, which can compromise its stability and durability, particularly in the absence of internal reinforcements. In this context, the work aims to analyze and compare three configurations of spacer femoral stems : one without reinforcement, one with a cylindrical reinforcement, and one with a flat reinforcement. The approach adopted combines 3D geometric modeling using SolidWorks and mechanical simulation using the finite element method via Abaqus. The prosthesis is inserted into a bone environment composed of cancellous bone surrounded by cortical bone, modeled to faithfully reproduce anatomical reality. The applied stresses reproduce physiological forces, including axial load due to body weight and abductor muscle strength. The results are analyzed for several stress components (σXX, σYY, σZZ, σXY, σXZ, σYZ, and Von Mises) on the outer and inner surfaces of the stem, distinguishing three functional zones: proximal, medial, and distal. The analyses show that the unreinforced configuration generates high stresses, particularly in the proximal zone. The cylindrical reinforcement partially reduces these stresses, while the flat reinforcement allows for a significant improvement in force distribution and a significant reduction in critical stresses, particularly in tension and shear. This thesis thus demonstrates the importance of a reinforced spacer design to ensure its mechanical performance and clinical safety. It highlights the value of digital tools for optimizing the design of medical devices and paves the way for more robust temporary prostheses, possibly 3D printed or reinforced with composite structures.
Endommagement des joints soudés
(2025) AID Yousra, Rihem; BERAKNE, Khadidja; Dr ELAHMAR Kadi, Adel
Welding is a very well-known assembly process in the mechanical industry, for this reason various studies and research are interested in this area, the variation of the processes has allowed researchers to deepen their research into the rupture and damage of welded structures. To this end, the aim of our thesisis the study of damage to welded joints of A48-AP steel. The objective of this manuscript is to highlight the influence of the heterogeneity of the microstructure of the welded joints on the mechanical behavior of the structure, as well as a numerical simulation by finite elements is applied on notched axisymmetric specimens to model the effect of heterogeneity on the damage of the welded structure.
Wind power prediction using Machine Learning models: A comparative study
(2025) Amar Bensaber Houssam, Amar Bensaber Houssam; Haddou Benderbal Mohammed Amjed, Haddou Benderbal Mohammed Amjed
This study addresses the challenge of integrating wind energy into power systems due to its natural variability by employing machine learning techniques to predict wind power generation using real field data from a Senvion MM82 wind turbine in France. Five algorithms—Random Forest, Decision Tree, XGBoost, CatBoost, and Linear Regression—were evaluated using standard performance metrics, with Linear Regression emerging as the most accurate. The research highlights the critical role of data preprocessing, feature engineering, and the inclusion of meteorological and operational parameters, ultimately demonstrating the potential of machine learning to enhance forecasting accuracy, support grid integration, and improve the reliability of renewable energy systems.
Impact du soudage sur les propriétés mécaniques des joints en C48.
(2025) SIBACHIR, Abderrahmane; BENDAHMANE, Youcef; Dr. CHERIET Nour EL HOUDA, Adel
This study analyzes the mechanical behavior of a welded assembly by combining finite element modeling (FEM) under static loading (via ABAQUS) and cyclic loading (via AFGROW). The objective is to identify critical zones—especially the heat-affected zone (HAZ)—and assess their impact on mechanical strength. The results reveal that the HAZ exhibits stress concentrations, plastic deformations, and damage significantly higher than those in the base metal, making it the most vulnerable region. Localized stress gradients were also detected there, confirming the influence of microstructural heterogeneities induced by welding. These observations emphasize the importance of optimizing welding design and process to mitigate stress concentrations in the HAZ, thereby improving the durability of welded structures.
Etude le bilan frigorifique d’une chambre à température négative
(2025) Bensaad, Mounia; DR. Nehari Tayeb; Benghorzi, Adel
In this we did a study of a cold room at a negative temperature, which allowed us to understand the importance and the necissitance to take into account all the elements that intervene in the study and dimension of a cold room, and we cited the components of the cold room. Also the study is used to choose the best refrigerant that works in a negative temperature
Fabrication par matériaux composites d'un échantillon de la coque d'une embarcation destinée aux petits métiers.
(2025) BENMANSOUR, Nabil; Abdelkrim, SIDI IKHLEF; DR.Amine Beloufa
As part of our PFE STARTUP project, we manufactured a boat hull sample using composite materials (E- type Mat fiberglass and polyester resin). We performed several mechanical tests to measure the permeability, hardness, and Young's modulus of our specimens. We also measured the chemical properties to determine the glass transition temperatures (Tg, Tc, Tf ). We aimed to demonstrate that our boat hull sample made from composite materials possesses the mechanical and chemical properties recommended in the maritime safety and boat construction specifications and standard regulations.
Optimisation d’un système solaire photovoltaïque pour la Médiathèque de l’université de Ain-Temouchent à l’aide de PVSYST
(2025) Benmedjahed, Hayet; Kribi, Souad; DR.Berrezoug Hiba Imane
This thesis focuses on the design and sizing of a photovoltaic system intended to supply electricity to the media library of the University of Aïn Témouchent. The study begins with a general overview of renewable energy sources, with a particular emphasis on photovoltaic (PV) energy and the operating principle of solar cells. A detailed description of the various components of a PV system—such as solar panels, batteries, and inverters—is then provided. To assess the system's performance, simulations were carried out using the PVSYST software. These simulations allowed us to generate production curves and analyze key indicators such as the annual specific yield and overall system efficiency. The study also considers meteorological conditions at the installation site, including solar irradiance and ambient temperature, which directly affect the system‘s performance. Finally, an economic assessment of the project was conducted to evaluate its feasibility and profitability. This work thus aims to demonstrate the technical and economic viability of using photovoltaic solar energy in the university sector.
Contribution à l’étude numérique du comportement énergétique des pompes centrifuges
(2025) BOUGUERRA, Kouider; BENSAOULA, Sidahmed; DR.HARCHOUCHE Zine el abidine
This study focuses on the modeling, simulation, and analysis of the hydrodynamic behavior of a centrifugal pump using Computational Fluid Dynamics (CFD) through the ANSYS Fluent software. Following a general overview of pumps and their classification, particular emphasis is placed on the operating principles of centrifugal pumps. The study then proceeds with the establishment of characteristic curves, which are essential for understanding pump performance. The numerical approach includes geometric modeling, meshing, the selection of physical models (turbulence, cavitation), and the definition of boundary conditions. Simulations are carried out for four fluids (water, salt water, methanol, and gasoline) under two flow regimes: without cavitation and with cavitation. The main objective is to analyze and compare pressure distribution and cavitation effects based on the nature of the fluid. The results obtained help assess the influence of fluid properties on pump operation and identify the conditions that promote cavitation.
Effets des défauts sur le comportement mécanique d'une structure fissurée
(2025) BENZIDANE, Manel; BERDAH, Adel; DR.Bouafia Farida
This final year project focuses on the field of fracture mechanics, with the main objective of analyzing the effect of defects on the mechanical behavior of cracked structures. The presence of flaws—such as cracks, notches, or voids—either resulting from manufacturing processes or service conditions, can lead to high local stress concentrations that may critically affect structural integrity. To better understand and predict crack propagation, this work relies on the fundamentals of Linear Elastic Fracture Mechanics (LEFM), using key parameters such as the Stress Intensity Factor (K) .This parameter enable the quantification of a crack's severity and the evaluation of a material’s resistance to brittle fracture. This study highlights the importance of integrating fracture mechanics in the design phase to improve the reliability, safety, and durability of mechanical components, especially in critical applications.
Simulation de mini-réseaux autonomes : Intégration des énergies renouvelables avec des éoliennes, des piles à combustible et des électrolyseurs.
(2025) BOUROUIS, Mebarek; EMTIR, Noreddine
In line with technological developments in the field of renewable energies and the growing need for electricity in isolated areas, off-grid systems represent a sustainable energy solution. The analysis and parametric study of these systems allow for improved performance and optimized energy production. To this end, this work focuses on the simulation of an off-grid system integrating wind turbines, electrolyzers, fuel cells, and a hydrogen storage system. The study is conducted under the climatic conditions of the Aïn Témouchent region, across two typical days: February 21 (winter) and July 21 (summer). The simulation was performed using TRNSYS software, which allows for accurate system modeling. This work provided a better understanding of the operation of a wind-hydrogen mini-grid and suggested optimization options to improve its energy autonomy.
Comportement élastique d’une fissure réparée sous chargement de traction biaxial pour une plaque aéronautique fissurée.
(2025) DAHO, Zouaouia
This thesis investigates the elastic behavior of a cracked aluminum plate (2024-T3 alloy) subjected to different types of loading (uniaxial and biaxial), with the objective of analyzing and enhancing its mechanical performance through repair solutions. The finite element method, implemented using Abaqus software, was used to simulate the fracture behavior and evaluate the stress intensity factors (KI, KII, KIII) along with the T-stress. Two repair strategies were studied: the first involved a Boron/Epoxy composite patch bonded to the plate with FM73 adhesive; the second used a functionally graded material (FGM) patch made of Ni–Al2O3, with five different Young's modulus distribution profiles. Numerical results showed that biaxial loading significantly increases mixed-mode crack propagation and stress concentrations. Compared to the conventional composite patch, FGM-based patches provided a better reduction of stress intensity factors and a more uniform distribution of stresses along the crack front. This study demonstrates the potential of FGM patches to improve the durability and reliability of repaired aerospace structures subjected to multiaxial stresses, and provides a numerical framework for further developments in smart repair technologies.
Modélisation de mini-réseaux autonomes : Intégration des piles à combustible, des électrolyseurs et des panneaux photovoltaïques avec des systèmes de batteries de secours.
(2025) KOURI, Abdessamad; KEBAILI, Oussama
With the rapid advancement of renewable energy technologies and the growing electricity demand in isolated regions, autonomous mini-grids have emerged as a sustainable and practical solution to current energy challenges. Parametric analysis applied to these systems contributes to enhancing overall performance and improving design accuracy. This study aligns with that objective by simulating an autonomous mini-grid that integrates photovoltaic panels, electrolyzers, fuel cells, a hydrogen storage system, and backup batteries. The analysis is conducted under the specific climatic conditions of the Aïn Témouchent region, using two representative days: December 14th (winter) and June 14th (summer). System modeling was performed using the TRNSYS software, known for its precision in simulating complex energy systems. The results provided a better understanding of the behavior of a solar-hydrogen mini-grid and helped identify potential optimization strategies to improve its energy autonomy.
Une étude comparative sur la prédiction de la production de l’énergie photovoltaïque à l’aide des méthodes d’apprentissage automatique
(2025) M.MOHAMMED KRACHAI, Saïd Yacine.; BENZEGUIR, Aicha Chahrazed.; Dr. DORBANE Abdelhakim
This Master’s thesis presents a comparative study of various machine learning algorithms used to predict photovoltaic energy production. Using the Orange3 software, models such as linear regression, decision trees, AdaBoost, and PLS were evaluated based on classification performance metrics. The main objective is to identify the most effective models for forecasting solar energy output using environmental data. The study highlights the growing role of artificial intelligence in the smart management of renewable energy and suggests future directions, including the use of real-time weather data and advanced techniques such as Machine Learning.
Étude statique et vibratoire d’une pale d’hélicoptère par le logiciel ANSYS
(2025) SAADALLAH, Yekhlef Ilies; ABID, Abdallah
The study of helicopter blade vibrations is essential to ensure flight safety and performance. This thesis aims to analyze the static and vibrational behavior of a helicopter blade with a NACA 0012 airfoil, using the ANSYS APDL software, version 17.2.The static analysis evaluates the mechanical resistance of the blade under aerodynamic lift and drag forces. The modal analysis identifies the natural frequencies and mode shapes of the blade, modeled using two different materials: aluminum 7075-T6 and carbon-epoxy composite. Finally, the harmonic analysis investigates the dynamic response of the blade to a periodic harmonic excitation, both with and without the inclusion of a damping system. The results demonstrate the effectiveness of the damper in reducing the vibrational amplitudes of the helicopter blade.
Impact du soudage sur les propriétés mécaniques des joints en C48.
(2025) SIBACHIR, Abderrahmane; BENDAHMANE, Youcef; Dr. CHERIET Nour EL HOUDA
This study analyzes the mechanical behavior of a welded assembly by combining finite element modeling (FEM) under static loading (via ABAQUS) and cyclic loading (via AFGROW). The objective is to identify critical zones—especially the heat-affected zone (HAZ)—and assess their impact on mechanical strength. The results reveal that the HAZ exhibits stress concentrations, plastic deformations, and damage significantly higher than those in the base metal, making it the most vulnerable region. Localized stress gradients were also detected there, confirming the influence of microstructural heterogeneities induced by welding. These observations emphasize the importance of optimizing welding design and process to mitigate stress concentrations in the HAZ, thereby improving the durability of welded structures.

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