Robert Kennedy Otieno1, Edward V. Odhong2 and James Mutua3, 1, 2Department of Mechanical and Mechatronic Engineering, Multimedia University of Kenya, Nairobi, Kenya, 3Department of Mechanical Engineering, Jomo Kenyatta University of Agriculture and Technology, Nairobi, Kenya
Magnesium alloys have high potential for applications in aerospace and vehicle manufacturing industries due to their low densities and possibility of achieving high specific strength and high stiffness. Due to low strength and relatively low stiffness of magnesium, their applications are impeded. This research focuses on a recipe of multicomponent alloys of magnesium with varied percentages of Mg, Al, Cu, Mn and Zn obtained from literature and optimizes the percentage compositions to obtain for high specific strength and specific stiffness. Relationships among percentage constituents of the alloy components are examined in Matlab R2022b using multiple linear regression. Optimization is achieved using genetic algorithm to determine the specific strengths and stiffness. The resulting optimal alloy component percentages by weight are used for microstructure simulation of thermodynamic properties, diffusion and phase transformations of proposed alloy is done in MatCalc software version 6.04. Results show potential for improved mechanical properties resulting from disordered structure in the high entropy magnesium alloy.
High entropy alloys, multicomponent alloy, specific strength, specific modulus.
Ahlem CHEBEL1 and Abdelouahab BENRETEM1 and Ivan DOBREV2, 1Laboratory: Electromechanical Engineering, Badji-Mokhtar-Annaba University 23000, Algeria, 3DynFluid Laboratory, Arts et Métiers-Paris Tech, 151, bd L'Hôpital, Paris, 75013, France.
This paper presents fuzzy logic control of Doubly Fed Induction Generator (DFIG) wind turbine in a sample power system. This research work involves the study of a phase in advance, to provide effective assistance, to all those who have to make decisions regarding the planning and implementation of wind energy projects. The main objective is to model the wind chain and the use of fuzzy logic for the control of this machine to ensure a good regulation we started with the modeling of the wind chain then the modeling of the DFIG and then the use of fuzzy logic for the regulation of the latter. Simulation results prove the excellent performance of fuzzy control unit as improving power quality and stability of wind turbine.
Wind Turbine, Doubly Fed Induction Generator, Fuzzy Logic, Defuzzification.
Sougata Koner1,3, Sumit2,3, R. Shukla2,3, S. K. Majumder1,3 and S. Satapathy1,3, 1Laser Biomedical Applications Division, Raja Ramanna Centre for Advanced Technology, Indore, 452013, India, 2Accelerator Physics and Synchrotrons Utilization Division, Raja Ramanna Centre for Advanced Technology, Indore, 452013, India, 3Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai-400094, India.
(2-2) LSMO/P(VDF-TrFE) bilayer and sandwiched laminated structured composites is prepared using adhesive method. ME coupling coefficient and the required bias magnetic field of tri-layer structure is higher compared to bilayer structure. Finite element method (FEM) based simulation using COMSOL Multiphysics 6.0 software supports the experimental findings. Both the experimental and simulation determination confirms the strain mediated ME effect in the bilayer and sandwiched laminated LSMO/P(VDF-TrFE) structures.
Polymer composite, magnetostriction, magnetoelectric effect, laminate structure.
Fatima SOFRANI1 and KeltoumaBOUDIA2, 1Department of Materials Science, Faculty of Science and Technology, Tissemsilt University, 38000 Tissemsilt, Algeria, 2Physical Engineering Laboratory, University of Ibn Khladoun, 14000 Tiaret, Algeria
The structural, electronic, and magnetic properties of CoFeVAs were investigated using first principle calculations, applying the full-potential linearized augmented plane waves (FP-LAPW) method based totally on functional density theory (DFT). After evaluating the results, the structural parameters and the calculations reveal that CoFeVAs compounds are most strong in their ferromagnetic configuration, in structure type III. The formation energy values showed that these compounds can be experimentally synthesized. Additionally, band structure and density of states (DOSs) measures reflect the half-metal behavior of CoFeVAs, we found that the total magnetic moment is an integer value of 3μB . The magnetic moment is especially an issue from the spin-polarization of the spin-polarization of d electrons of Co and Fe atoms for all compounds. The half-metallicity is broken when the conduction and valence bands cross the Fermi level.
Half-metallic, First-principle calculations, Quaternary Heusler.