Department of Mechanical Engineering

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Reliability Analysis of Low Alloy Ferritic Piping Materials
(Springer, Dordrecht, 2009) A. Guedri; B. Merzoug; Moe Khaleel; A. Zeghloul
The aim of this study is to improving microstructure and mechanical properties of the weldable gas pipeline steel using laboratory mill. To achieve the required microstructure and mechanical properties of thermo mechanically processed HSLA steels, it is necessary to have an idea about the role of composition and process parameters. The large numbers of parameters obtained during the production process in the plant were systematically changed to optimize the strength and toughness properties. The optimized parameters were used for the production of the API X60/X70 steel. However, the controlled cooling after rolling should result in transformed products that provide excellent combination of strength and toughness. The coiling at an appropriate temperature have the advantage of the precipitation strengthening, giving further rise to the high yield strength and also improvement in toughness of the steel. The coiling temperature is a decisive parameter because it determines the beginning of the formation of fine precipitations. Therefore, four different laboratory cooling systems were used, in this study to simulate the rolling conditions of a real industrial Thermomechanically controlled process, as close as possible and to check the possibilities of improving the mechanical properties of the welded pipeline steel.
Structural Reliability Improvement Using In-Service Inspection for Intergranular Stress Corrosion of Large Stainless Steel Piping
(InTech, 2012) A. Guedri; Y. Djebbar; Moe. Khaleel; A. Zeghloul
This paper describes probabilistic calculations that address Intergranular Stress Corrosion Cracking (IGSCC) of large stainless steel piping, a degradation mechanism of major concern to nuclear pressure boundary integrity. The first objective was to simulate the cracking of stainless steel piping under IGSCC conditions using the general methodology rec¬ommended in the modified computer program Piping Reliability Analysis Including Seismic Events (pc-PRAISE), and to characterize IGSCC by a single damage parameter (Dσ). This parameter, depends on residual stresses, environment conditions, and degree of sensitization. The second objective is to evaluate the structural reliability using remedial actions for IGSCC which are limited to benefits of in-service inspections and to identify the most effective approaches to improving piping reliability.
Analysis and Characterization of PEMFC Power Systems with Bond Graph
(2013-11) Nedjem Eddine Benchouia; Elias Hadjadj Aoual; Lakhdar Khochemane; Bouziane.Mahmah
This paper addresses the problem of bond graph methodology as a graphical approach for modeling fuel cell systems. The system consists of a Proton Exchange Membrane Fuel Cell (PEMFC) stack and an interleaved boost converter. Simulation results illustrate the simplified system response obtained using the implementation of the governing equations in MATLAB/Simulink or a bond graph
Bond graph modeling approach development for fuel cell PEMFC systems
(www.elsevier.com/locate/he, 2014-09-14) Nedjem Eddine Benchouia; Elias Hadjadj Aoul; Lakhdar Khochemane; Bouziane Mahmah
This paper addresses the problem of bond graph methodology as a graphical approach for modeling fuel cell systems. The system consists of a Proton Exchange Membrane Fuel Cell (PEMFC) stack, an interleaved boost converter, battery pack connected via a buck converter. Simulation results illustrate the simplified system response obtained using implementation of the governing equations in MATLAB/Simulink and is compared with a bond graph implementation in the simulation program 20-sim.
Determination of the predictive Reliability for PEMFC system
(IPCO, 2015) Nedjem Eddine Benchouia; Lakhdar Khochemane; Belgacem Madi
Today reliability is one of the serious requirements of fuel cell systems, and their associated cost in all applications, in general, and automotive applications, in particular when the power requirement is scaled up, is still unclear. Therefore, increasing cell lifetimes and membrane electrode assembly (MEA) durability is the technical advance that may be expected so that we can have a remarkable tendency of decreasing fuel cell costs with a significant increase in global systems safety, that best meet customer requirements. Our contribution, in this paper, focuses on the simulation method of the “Monte Carlo” over the entire reliability calculation for the PEMFC system, with the integration of the most critical elements of them and the proposition of the contrivances for their modifications, in the objective to predict the lifetime and failure rate of a system by reliability calculations: a problem formulation is given, reliability calculations of PEMFC are defined and a reliability estimation methodology is developed. We did obtain, however, some results that can help us in the prediction reliability way at the design
An adaptive fuzzy logic controller (AFLC) for PEMFC fuel cell
(www.elsevier.com/locate/he, 2015) Nedjem-Eddine Benchouia; Abdallah Derghal; Bouziane Mahmah; Belgacem Madi; Lakhdar Khochemane; Elias Hadjadj Aoul
Among the various fuel cell technologies available for use in vehicular systems, the Proton Exchange Membrane Fuel Cell (PEMFC) has drawn the most attention due to its simplicity, viability, higher power density, and operation at lower temperatures. Due to these features, PEMFC is considered to be the most suitable technology for vehicular systems, industry, and other applications. As fuel cells are likely to be used in many future applications, great efforts have recently been made for their comprehension and design. This paper focuses on a 1.2WPEM fuel cell unit and develops the models of stack voltage and stack power. While the PEM fuel cell is a nonlinear process, it is very suitable to use fuzzy control to solve the control issue of the fuel cell. The stack output power can be controlled to a given value by using a variable universe fuzzy controller by controlling the input gas flow rate. In this paper, an FLC controller has been designed to control the voltage in the presence of fluctuations. The results of the implementation of this designed FLC controller on a dynamic electrochemical model of a small size 1.2 W, PEM fuel cell have been simulated by MATLAB Simulink and compared with a traditional PID controller. Simulation results show that good control effects can be achieved by using the adaptive fuzzy control system.
Synthesis of a control law for stabilization nonlinear systems: results and discussions
(IPCO, 2015) Nedjem Eddine Benchouia; Belgacem Madi; HichamTebbikh; Mounir Benadja
Dans ce papier, nous avons étudié le problème de stabilisation des systèmes non linéaires de la forme x= F(x)+Bu au voisinage d'une position d'équilibre de F(x). La stratégie consiste en l'application de la théorie des variétés centrales, permettant de passer d'un système complexe à un système simple, de dimension réduit, facile à étudier. Des exemples illustratifs ont été discutés et valider numériquement afin de synthétiser une loi de commande stabilisatrice pour tels systèmes.
Maintenance Et Réhabilitation Des Structures Par Matériaux Composites.
(2016-05-23) Hatab Salim
Experimental study of the static behaviour of the PEM fuel cell
(IPCO, 2017) Nedjem Eddine Benchouia; Bouziane Mahmah
This work proposes and justifies an easy electric model of a power generation system based on a PEM fuel cell, the H-Tec PEM Power Module of 1.2W. This model has been developed by means of experimental data obtained in our laboratory.
Fuel Cells and Hydrogen Storage: Challenges Facing Vehicle Manufacturers
(IPCO, 2017)
The main challenge of our time is to find renewable energy sources that meet the needs of society. Nevertheless, energy must meet several criteria such as abundance, ease, and speed of use, but also the cost of production which must be low. In addition, the aspect of "clean and renewable energy" is also to be taken seriously. Today, fuel cells are a magnet for researchers because they have many advantages. First of all, these batteries have the capacity to produce a significant amount of electricity, water, and heat. In addition, the reagents of the battery are the oxygen naturally present in the atmosphere and the di-hydrogen that needs to be produced. Its production is therefore a major stake for the installation of the fuel cell. Many hopes rest on the fuel cell. As we have seen, it is one of the energy sources that have the most to become and application area. With a relatively high efficiency, and zero pollutant emissions, this fuel cell has many other advantages such as the variety of batteries that can be adapted to all current needs such as transportation, global electricity generation, or digital. Because of the benefits that flow from its use as an automobile fuel, hydrogen is expected to take precedence over other synthetic fuels in the not-too-distant future.
La fiabilité prévisionnelle d’une pile à combustible de type PEMFC
(International Conference on Maintenance and Industrial Safety CIMSI'2017, 2017-11-21) Nedjem Eddine Benchouia; Belgacem MADI; Mounir BENADJA
The objective of this paper is to propose a new method for calculating predictive reliability by applying the State Space Method (MEE) to PEMFC fuel cell systems. Our work focuses on estimating the reliability of the PEMFC fuel cell itself applied to components subject to damage, conversion systems (boost, buck), and storage systems.
Experimental study of the static behaviour of the PEM fuel cell
(5ème Conférence Internationale des Energies Renouvelables (CIER– 2017), 2017-12-22) Nedjem Eddine Benchouia; Bouziane Mahmah
This work proposes and justifies an easy electric model of a power generation system based on a PEM fuel cell, the H-Tec PEM Power Module of 1.2W. This model has been developed by means of experimental data obtained in our laboratory.
Modeling a photovoltaic pumping system
(Intternattiionall Semiinar iin Industtriiall Engiineeriing and Applliied Matthemattiics ((ISIEAM''2018), 2018-10-24) Nedjem Eddine Benchouia; Yahia BELLARAGUEB; Belgacem MADI; Mounir BENADJA
The work presented in this paper concerns the modeling and simulation of a photovoltaic panel intended to drive a motor pump through a DC-AC converter (inverter). In our analysis, we designed a PV system where the PV generator is the isofoton module producing, under standard test conditions (CST), a peak power of 110W, an optimal current of 3.38 A and an optimal voltage of 43.2V. Indeed the characteristic I (V) of the generator depends on the solar illumination and the temperature. These climatic variations cause the fluctuation of the point of maximum power. The simulation results obtained under Matlab / Simulink show the performance of the dynamic behavior of photovoltaic systems. The comparison of the results obtained by simulation with experimental ones is essential.
Elemental Analysis of Industrial Lubricants
(Intternattiionall Semiinar iin Industtriiall Engiineeriing and Applliied Matthemattiics ((ISIEAM''2018), 2018-10-24) Nedjem Eddine Benchouia; Lamia BENZAID; Azzeddine BOUZAOUIT
As the most fundamental test used in oil analysis today, elemental analysis can detect between 15 and 25 different elements that are related to wear metals, contaminant metals and oil additives. In our work we have realized a spectrometric emission analysis for the characterizations of the contamination of the industrial lubricants which are of type iso 100 and iso 32, they are used for the lubrication of the reciprocating and rotary compressors respectively.
On the Adomian Decomposition Method and its Applications to Mechanics
(5ème Conférence Internationale sur la maintenance et la sécurité Industrielle (CIMISI’2019), 2019) Nedjem Eddine Benchouia; Belgacem MADI; Mohamed Rafik SARI; Azzedine BOUZAOUIT
In this paper, we review the Adomian decomposition method (ADM). We give a general description of this method and we present some modifications for the standard Adomian decomposition method. Application is made to Blasius problem, a dissipative wave equation, and free vibration of Euler-Bernoulli beam. The results obtained have been discussed and shows the effectiveness of the method.
Reliability analysis of irregular zones in pipelines under both effects of corrosion and residual stress
(Elsevier, 2019-04-01) Nahal Mourad; Chateauneuf Alaa; Sahraoui Yacine
DEVELOPMENT AND APPLICATION OF A DECISION MAKING TOOL FOR FAULT DIAGNOSIS OF TURBOCOMPRESSOR BASED ON BAYESIAN NETWORK AND FAULT TREE
(Production Engineering Committee of the Polish Academy of Sciences, Polish Association for Production Management, 2019-06-28) Lakehal Abdelaziz; Nahal Mourad; Harouz Riadh
Fuel Cells and Hydrogen Storage: Challenges Facing Vehicle Manufacturers
(3èmeCongrès International sur les Energies Renouvelables et le Développement Durable (ERDD-2019), 2019-07-31) Bilal SOLTANI; Nedjem Eddine Benchouia
The main challenge of our time is to find renewable energy sources that meet the needs of society. Nevertheless, energy must meet several criteria such as abundance, ease and speed of use, but also the cost of production which must be low. In addition, the aspect of "clean and renewable energy" is also to be taken seriously. Today, fuel cells are a magnet for researchers because they have many advantages. First of all, these batteries have the capacity to produce a significant amount of electricity, water and heat. In addition, the reagents of the battery are the oxygen naturally present in the atmosphere and the di-hydrogen that needs to be produced. Its production is therefore a major stake for the installation of the fuel cell. Many hopes rest on the fuel cell. As we have seen, it is one of the energy sources that have the most to become and application areas. With a relatively high efficiency, zero pollutant emissions, this fuel cell has many other advantages such as the variety of batteries that can be adapted to all current needs such as transportation, global electricity generation or digital. Because of the benefits that flow from its use as an automobile fuel, hydrogen is expected to take precedence over other synthetic fuels in the not-too-distant future.
PREDICTION DU CHANGEMENT D'ETAT DE LA VISCOSITE DU LUBRIFIANT PAR LES CHAINES DE MARKOV
(5th International Conference on Maintenance and Industrial Safety CIMSI’2019, 2019-12-03) Lamia Benzaid; Nedjem Eddine Benchouia; Azzedine Bouzaouit
The quality of lubricating oil used in the engine plays an important role in extending engine life and improving engine performance. Viscosity is one of the major physicochemical factors of lubricant quality and effectiveness, Its ability to provide the effective thickness of the lubricating layer between the friction surfaces, which prevents severe wear and failure of engines. In this study, we presented the methodology which makes it possible to model the degradation of the viscosity of lubricating oils used in combustion engines, and which are operated in very severe conditions. For each oil studied, we propose to associate a Markov chain describing the transition of its viscosity from one state (i) to another state, Knowing that the viscosity of engine oils passes through the following states: good, admissible, degraded, very degraded. We have confirmed that the proposed model gives detailed results describing the different states of the oil analyzed.
Vector control of a three-level parallel structure UPS powered asynchronous machine
(5th International Conference on Maintenance and Industrial Safety CIMSI’2019, 2019-12-03) Nedjem Eddine Benchouia; Bilal SOLTANI; Belgacem MADI; Mohamed SAAIDIA
This work is dedicated to the vector control of the asynchronous machine; with orientation of the rotor flow. This technique makes it possible to decouple the control of the flow from that of the torque, similar to that of the DC machine with separate excitation. Indeed, the direct flow orientation method has been developed for conventional speed control. Through the simulation results obtained, we noted a good behavior of this one for the various tests carried out, however, shortcomings were observed concerning the sensitivity to disturbances of the load torque and their rejection time. But what strongly penalizes it is essentially its low robustness vis-à-vis the variations of the moment of inertia especially compared to those of the rotor inductance. In fact, the speed response is slightly affected, and for the changes in the rotor inductance, the decoupling of the machine deteriorates.