Mediterranean Journal of Modeling and Simulation

9

Authors: Mohamed HOUAS, Mihoub BOUDERBALA, Abdelkader BENALI

This paper studies the existence of solutions for Caputo fractional hybrid q-di¤erential equations. The existence obtained by using the Leray-Schauder's alternative, while the uniqueness of solutions is established by means of Banach's contraction mapping principle. An illustrative examples are also included.

11

Authors: Mohamed Bendali, Boualem Bouyahiaoui, Adel Belmecheri, Salah-Eddine Bentridi, Abdeslam Abtouta

This paper presents all stages of the gravimetric network of the upper Chelif basin, including its development and data processing. This network consists of twenty six gravimetric stations. The descriptions of the design ; the gravity survey of the network and the gravimetric stations coordinates are given. These gravimetric stations are connected to the Algerian zero order gravimetric network by means of relative gravimetric values. The measurements were performed using a terrestrial LaCoste Romberg D220 gravimeter, with an instrumental accuracy of 1¸tglas. The accuracy of the determination of gravity values at individual stations is about 13 ¸tgals. In order to ensure the uniformity of obtained results and thus avoid having several gravity values at the same station, the network has been compensated. This compensation was performed by the ginning method.

16

Authors: B. Abderezzak, M. Hinaje, J. Leveque

This work is an experimental approach regarding the opportunity to exploit Proton Exchange Membrane Fuel Cell (PEMFC) waste heat, using Thermoelectric Generator (TEG) Modules. The amount of energy recovered by TEG modules can be stored using NiMH batteries, and used for feeding the PEMFC Stack screens and LED lights once its turns on "Stand-by" mode. In fact, several combinations are envisaged to depict the optimal working conditions of the proposed system. The proposed 6A and 15A TEG modules are experienced under a 20A and 30A of load applied on the PEMFC Stack. A Re-Start mode is then investigated to observe the system response against such scenarios. The experimental result shows a promising output voltage rates generated by the TEG modules. At stack working temperature of 60µrC, the 15A TEG voltage is 500 mV and 571 mV under stack load of 20A and 30A respectively. In Re-Start mode, at same stack temperature, the output voltage is 517 mV. A numerical approach is employed for the determination of experimental Seebeck coe¢ cient and the evaluation of the thermoelectric conversion efficiency, using a one-dimensional (1-D) steady state model. A polynomial function of the experimental Seebeck coe¢ cient is then deduced.

10

Authors: Belkacem CHAOUCHI

This note is devoted to the study of Laplace equation set on a planar cusp domain. A mixed boundary conditions are imposed to our problem. The study is performed in the little Hölder spaces framework.

12

Authors: Hrishikesh D BACHCHHAV., Lokvarapu Bhaskara RAO, Pankaj SONJE

In this paper, we are present the performance of engine coolant hoses (radiator hoses) used in passenger cars by checking various physical behaviours such as hose leakage, hose burst, hose collapse or any mechanical damage as studied-thru design guidelines, CFD analysis and product validation testing and also check pressure drop of the hoses when engine will be running. The design term is more likely used for technical part modelling using CAD tool. Later on, we will focus on the transformation of the part design to process design. The process design term is more likely used for "tooling design" for manufacturing of the product using CAD Tool. Then inlet hose carries coolant from engine to radiator inlet tank, then coolant circulated in radiator and passed through radiator outlet tank to water pump of engine with the help of outlet hose. After that …nding any leakage, Burst, damage or collapse of hose and pressure drop of the hose with the help of design checklist, CFD Analysis and product validation testing.

15

Authors: Mohamed Houas

In this paper, we study existence and uniqueness of solutions for a coupled system of multi-point boundary value problems for fractional di¤erential equations. Applying principle contraction and Shaefer's fixed point theorem new existence results are obtained.

16

Authors: D. Ouamara, F. Dubas, S.A. Randi, M.N. Benallal, C. Espanet

In order to design multi-phases permanent-magnet (PM) synchronous machines (PMSMs), a simplified analytical method is used to calculate the various geometrical parameters. The winding of the machines is concentric with two layers and the PMs are mounted on the rotor surface. The sizing model is coupled to an optimization process based on genetic algorithm (AG). The Pareto front obtained from the optimization, made it possible to choose the optimal solution. The optimal variables are injected into the model to calculate the di¤erent parameters. The optimization results are then used for two-dimensional (2-D) finite-element simulation, where a power balance is established for each multi-phases PMSMs.

9

Authors: M. N. Benallal, A. C. Vataev, A. Doane, K. Hamouda, T. Nahdi

This article describes the results of experimental studies of HF input and primary parameters. A simulation model in Matlab SimulinkTM of multiphase windings as ladder circuit of coils is developed. A method for determining the primary parameters of ladder equivalent circuits is presented.

11

Authors: Mohamed Benkahla, Rachid Taleb, Zinelaabidine Boudjema

This article presents the powers control of a variable speed wind turbine (WT) based on a doubly fed induction generator (DFIG) because of their advantages in terms of economy and control. The considered system consists of a double fed induction generator whose stator is connected directly to the network and its rotor is supplied by seven-level inverter with structure NPC are well used to minimize the harmonics absorbed by the DFIG. In order to control the power owing between the stator of the DFIG and the grid. Have been studied and compared two types of controllers : Sliding Mode Control (SMC) and Fuzzy SMC (FSMC). Their respective performances are compared in terms of power reference tracking, response to sudden speed variations, sensitivity to perturbations and robustness against machine parameters variations.

18

Authors: Mohamed Zellagui, Almoataz Youssef Abdelaziz

The paper presents a new hybrid global optimization algorithm based on Chemical Reaction based Optimization (CRO) and Di¤erential evolution (DE) algorithm for nonlinear constrained optimization problems. This approach proposed for the optimal coordination and setting relays of directional overcurrent relays in complex power systems. In protection coordination problem, the objective function to be minimized is the sum of the operating time of all main relays. The optimization problem is subject to a number of constraints which are mainly focused on the operation of the backup relay, which should operate if a primary relay fails to respond to the fault near to it, Time Dial Setting (TDS), Plug Setting (PS) and the minimum operating time of a relay. The hybrid global proposed optimization algorithm aims to minimize the total operating time of each protection relay. Two systems are used as case study to check the e¢ ciency of the optimization algorithm which are IEEE 4-bus and IEEE 6-bus models. Results are obtained and presented for CRO and DE and hybrid CRO-DE algorithms. The obtained results for the studied cases are compared with those results obtained when using other optimization algorithms which are Teaching Learning-Based Optimization (TLBO), Chaotic Di¤erential Evolution Algorithm (CDEA) and Modified Di¤erential Evolution Algorithm (MDEA), and Hybrid optimization algorithms (PSO-DE, IA-PSO, and BFOA-PSO). From analysing the obtained results, it has been concluded that hybrid CRO-DO algorithm provides the most optimum solution with the best convergence rate.

10

Authors: Nabiha Brik, Mourad Chamekh

In this work we consider a nonlinear elliptic partial differential equation, which is derived from an application of a nonlinear Schrödinger equation. Using a variational approach on this problem leads to an optimization problem with a nonlinear constraint. A numerical solution based on finite-element method is used. We propose a new iterative algorithm to relax this problem to a quadratic version.

11

Authors: Bilal Abderezzak

The new world energy policies encourage the use of renewable energy sources with clean technologies, and abandon progressively the fossil fuel dependence. Another energy generation trend called commonly the “Waste-to-Energy” solution, uses organic waste as a response for two major problems: energy generation and waste management. Thanks to the anaerobic digestion, the organic waste can provide a biogas composed essentially from Carbone dioxide (CO2) and Methane (CH4). This work aims essentially to help students, researchers and even decision makers to consider the importance of biogas generation. The proposed tool is the last version of our previous tool which is enhanced and completed. It presents the potential to produce biogas of any shortlisted kind of waste, including also some energy valorization ways. A technical economical data are introduced for eventual feasibility studies.