A flexible modular master programme in technology developped whithin a Tempus Project

In today’s competitive industry and in view of recent economic turbulences new frontiers of challenges emerge that require new educational paradigms accompanied by new tools and methodologies applicable to all aspects of engineering areas including the functional and organizational aspects. In accordance with the objectives stipulated by the Council of European Union work programme on the future of education and training, a Tempus project (2010-2013) has been mounted to develop a novel model for modular programmes to be used in education of technology specialities at master level. The model is implemented in manufacturing technology and management area and has general applicability for technology education in several fields. The main feature of this project consists in flexibility, adaptability, dynamic interactivity while consolidating theoretical and practical skills. MasTech is the name of a flexible modular master two-year programme in technology being developed according to the Bologna process that is to be adapted to the particular conditions of the universities in Algeria, Morocco and Tunisia. Three European Universities (Sweden, Germany, France) are involved in the project. This paper introduces MasTech and describes the different steps that have been followed to develop the master programme taking into account both academic and industrial needs and priorities. Results are expressed in terms of a professional master programme that has been submitted for accreditation.TEMPUS - MASTECH -2010 - 3369 / 001 - 00

Integrated Energy Management of a Plug-in Electric Vehicle in Residential Distribution Systems with Renewables

International audienceAccording to innovation in grid connected transportation industry and with ever increasing concerns on environmental issues and clean energy, electric vehicles (EVs) and hybrid electric vehicles (HEVs) with low noise, zero emission, and high efficiency have attracted more and more attention of researchers, governments and industries, they are becoming the most likely fleets to replace gasoline vehicles in future power systems. In addition to the approved advantages for transportation, EVs have the potential to provide other benefits within the connected residential distribution to micro-grids and smart grids as part of a vehicle-to-grid (V2G) system, knowing that in future systems residential distribution can be seen as an energy resource with decentralized and autonomous decisions in the energy management called smart house or prosumer. They can participate effectively in helping to balance supply and demand by valley filling and peak shaving. The EV battery can be charged during low demand and the stored power can be fed power back into the micro-grid during high-demand periods, providing a spinning reserve to dump short power demand changes. V2G may also be used to buffer renewable energy sources, such as photovoltaic generators, by storing excess energy produced during illumination periods, and feeding it back into the grid during high-load periods, thus effectively stabilizing the intermittency of solar power. In this context, this paper describes an energy management system for a smart house based on hybrid PV-battery and V2G. Keywords—Vehicle-to-grid (V2G), vehicle-to-home (V2H), residential distribution, smart house, balance supply and demand

EXPERIMENTAL STUDY ON WEAR OF MIXED CERAMIC TOOL AND CORRELATION ANALYSIS BETWEEN SURFACE ROUGHNESS AND CUTTING TOOL RADIAL VIBRATIONS DURING HARD TURNING OF AISI 52100 STEEL

Wear investigation has been conducted on mixed ceramic cutting tool (70% Al2O3 + 30% TiC) when machining hardened AISI 52100 steel (66 HRC). Experimental planning method has been used to assess the relationship between radial cutting vibrations and surface roughness as a function of the machining conditions. First, wear results show that when the cutting speed is increased 3.78 times, tool life drops of 8.75 times. When increasing the feed rate by a factor of 2.75 tool life decreases by a factor of 1.4. Then, the effect of cutting parameters (speed, feed and depth) on one hand surface roughness (Ra) and in the other hand radial tool vibrations has been determined using the multiple regression models with a coefficient of determination R² equal to respectively 95.5% and 89.3%. With regards to surface roughness, ANOVA analyses reveal that feed rate contributes of about 84% in the surface roughness. Meanwhile, looking at the vibration phenomena, the cutting speed has the most significant effect on the values of radial tool vibrations comparing to depth and feed rate effect. Finally the correlation between surface roughness and tool radial vibrations has been analyzed through the linear and nonlinear correlation coefficients. The values of Pearson and Spearman coefficient were respectively low 0.465 and 0.554 showing that above 1000 rpm of cutting speed, the machining system is no more stable generating a great effect of cutting vibrations

Contribution in the evaluation of a performance index of hot forging dies

The present paper focuses on a new concept of evaluation of a performance index of hot forging dies through the combination of a process behaviour model and a reliability approach analysis of the forging process. The process behaviour is modelled and simulated using the computer-aided engineering FORGE® tool that allowed optimizing the forging parameters and determining the stresses and strains together with temperatures during the forging process and also identifying the factors affecting the die life. The respective reliability mechanical model is developed and reliability simulations have been conducted using PHIMECASoft tool in order to evaluate the reliability index β and determine the sensitivity of the variations in the random values of the input parameters of the forging process. The concept of this contribution has been applied to real industrial dies used to forge automotive steering levers produced in the forging workshop of the Ferrovial Company of Annaba in Algeria. The performance index is given by the number of forged parts corresponding to the reliability index of the dies before failure occurs

A flexible modular master programme in technology developped whithin a Tempus Project

International audienceIn today's competitive industry and in view of recent economic turbulences new frontiers of challenges emerge that require new educational paradigms accompanied by new tools and methodologies applicable to all aspects of engineering areas including the functional and organizational aspects. In accordance with the objectives stipulated by the Council of European Union work programme on the future of education and training, a Tempus project (2010-2013) has been mounted to develop a novel model for modular programmes to be used in education of technology specialities at master level. The model is implemented in manufacturing technology and management area and has general applicability for technology education in several fields. The main feature of this project consists in flexibility, adaptability, dynamic interactivity while consolidating theoretical and practical skills. MasTech is the name of a flexible modular master two-year programme in technology being developed according to the Bologna process that is to be adapted to the particular conditions of the universities in Algeria, Morocco and Tunisia. Three European Universities (Sweden, Germany, France) are involved in the project. This paper introduces MasTech and describes the different steps that have been followed to develop the master programme taking into account both academic and industrial needs and priorities. Results are expressed in terms of a professional master programme that has been submitted for accreditation

FEM investigation of concrete silos damaged and reinforced externally with CFRP

The present work investigates the reinforcement of concrete wheat-grain silos under initial damage. The reinforcement is achieved by mounting bands of carbon fiber reinforced polymer (CFRP) on the external walls of the silo. 4 modes of reinforcement are adapted according to the width of the band, the gap between two bands, the height of reinforcement and the number of layers achieved through banding. Analytical analyses were conducted using the Reimbert method and the Eurocode 1 Part 4 method, as well as numerically through the finite element software Abaqus. Results show that the normal pressure reaches a peak value when approaching the silo hopper. Initial damage in a concrete silo was first determined using a 3D geometrical model, while the damage analyses were conducted to optimize the CFRP reinforcement by mounting 2 CFRP bands close together above and below the cylinder–hopper joint. Increasing the number of banding layers could produce better performance as the damage was slightly decreased from 0.161 to 0.152 for 1 and 4 layers respectively

Étude expérimentale des propriétés mécaniques et morphologiques dans un tube de gaz en HDPE-80

L'objectif de cette étude expérimentale est d'établir la distribution des propriétés mécaniques et morphologiques à travers la paroi d'un tube de transport du gaz naturel en polyéthylène de haute densité (HDPE). L'approche proposée utilise un filament continu et uniforme, automatiquement usiné du tube à faible vitesse de coupe et à profondeur de passe optimale afin de réduire le flux de chaleur ainsi que les modifications structurales. Des courbes typiques (σ−ε), dans chaque couche, sont obtenues sur une machine d'essai conçue pour les polymères et sont statistiquement analysées. Elles montrent que le comportement mécanique du tube en HDPE est pratiquement divisé en 3 zones distinctes dont la seconde reste la plus étendue. Le niveau de contrainte moyen exprimant l'étirage à froid pour une couche donnée est presque constant à travers l'épaisseur du tube. Les contraintes et le module d'élasticité donnent de très bonnes corrélations avec l'épaisseur indiquant une augmentation de la surface externe vers les couches internes. Ceci est expliqué par l'évolution de cristallinité durant le procédé de production faisant appel à un refroidissement échelonné dans le temps et qui génère des contraintes résiduelles. Les corrélations statistiques à l'écoulement plastique, au début de l'étirage à froid et à la rupture indiquent des relations linéaires acceptables pour une probabilité d'erreur p ≤ 0,05. D'autre part, une corrélation linéaire croissante caractérise la relation entre la contrainte limite et le module d'élasticité. Ce résultat est confirmé dans la littérature pour des éprouvettes standards obtenues par moulage en compression

A probabilistic approach to estimate the remaining life and reliability of corroded pipelines

Considering corrosion rate during the remaining life assessment of aging pipelines is fundamental to calculate the interval between two consecutive inspections. A total of 798 internal and external corrosion defects have been detected, using the Magnetic Flux Leakage intelligent inspection tool, over 48 km of a pipeline length located in the west region of Algeria. The statistical analysis has shown that there is a strong correlation between the corrosion defect length and the corrosion defect circumferential width, with a significant correlation coefficient equal to 82.87%. A probabilistic methodology is presented for the assessment of the remaining life of a corroded pipeline transporting gas, and a finite element method (FEM) was used to assess the pipeline failure pressure. The numerical FEM modeling results were compared with the commonly used codes-models for calculating limit pressure to establish a more realistic and accurate engineering model. The reliability analysis of an API 5L X60 steel made Algerian natural gas pipeline, in service for thirty years, and exposed to active corrosion attack, is presented. The sensitivity analysis of the basic random variables within the nonlinear limit state function was carried out to bring out the relative contribution of each variable affecting the remaining life of corroded pipelines. The reliability analysis is carried out by using Breitung's formula, based on the second-order reliability method (SORM). The reliability assessment of the corroded pipeline is based on the usage of the notched failure assessment diagram (NFAD), different codes for the calculation of the failure pressure, and the numerical results using the finite element analyses (FEA) software ANSYS