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Introduction to Mesh Based generated Lumped Parameter Models for Electromagnetic Problems using Triangular Elements

CES Transactions on Electrical Machines and Systems 2023年第1期7卷 21-34页

作者： Haidar Y.diab Salim Asfirane Nicolas Bracikowski Frédéric gillon Yacine Amara UniversitéLe Havre Normandie Le Havre76600France département génie industriel et maintenance Nantes UniversitéSt-Nazaire44602France Ecole Centrale de Lille Hauts-de-France59651France IEEE

This paper is an introduction to mesh based generated reluctance network modeling using triangular *** contributions on mesh based generated reluctance networks using rectangular shaped elements have been published,but very few on those generated from a mesh using triangular *** use of triangular elements is aimed at extending the application of the approach to any shape of modeled *** concepts of the approach are presented in the case of electromagnetic *** procedure for coding the approach in the case of a flat linear permanent magnet machine is *** developed under MATLAB environment are also included.

关键词： Lumped parameter modeling Finite element method Mesh Triangular elements Electromagnetic devices Modeling

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Comparative Study of Available Solar Potential for Six Stations of Sahel

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Smart grid and Renewable Energy 2023年第8期14卷 153-167页

作者： Serigne Abdoul Aziz Niang Ahmed gueye Astou Sarr dialo diop Saka goni Bado Nebon FST Département de Physique Université Cheikh Anta Diop de Dakar Dakar Sénégal département de génie industriel et maintenance Université Polytechnique de Mongo Mongo Tchad Laboratoire d’Energies Thermiques Renouvelables Université Joseph KI-ZERBO Ouagadougou Ouagadougou Burkina Faso

Sahel is an African area with high solar potential. However, this potential is not uniform across the region. This paper examines the spatial distribution of the available solar potential by using six stations across the Sahel area. This comparative study was based on the analysis of in situ measurements in dakar in Senegal, Niamey in Niger, Ouagadougou, gaoua, dori in Burkina Faso and N’djamena in Chad. The results showed the presence of a good global solar potential with an average value of about 5.43 kWh/m2/day. The maxima of global potential are noted in the northern part in Niamey with a value of 6.24 kWh/m2/day while the minima are recorded in the south-eastern part in N’djamena with an irradiation close to 4.71 kWh/m2/day. Then, the monthly evolution of this potential shows similar trends for all stations. Indeed, two maximums are observed during the year in Spring (March) and Autumn (October). However, for most of these stations, the minima of global potential are recorded in Winter (November, February) and during the rainy season (July, October). Moreover, the direct normal potential also shows seasonal trends for the two stations (dakar, Niamey) where it was measured. The maxima of direct normal irradiation (dNI) are observed between February and May with a value of 5.5 kWh/m2/day in dakar and in Niamey with a value around 5.32 kWh/m2/day between February and November.

关键词： Solar Potential Pyranometer Sahel Comparative Study Sunlight Analysis

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Long-Term Variation of Sunshine duration and Their Inter-Action with Meteorogical Parameters over Chad, Central Africa

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Natural Resources 2019年第3期10卷 47-58页

作者： Saka goni Haroun Ali Adannou dialo diop Mamadou S. drame Bienzeube Tikri Mahamat Barka Aboubaker Cheidikh Beye groupe de Laboratoire de Physique des Solides et Sciences des Matériaux Faculté des Sciences et Techniques Université Cheikh Anta Diop de Dakar Dakar Sénégal département de génie industriel et maintenance Université Polytechnique de Mongo Mongo Tchad département génie Chimique Institut National Supérieur de Pétrole de Mao Mao Tchad Faculté des Sciences Exactes et Appliquées Université de Ndjamena Ndjamena Tchad

This study aims to evaluate the long-term variations of sunshine duration and to estimate its interaction with meteorogical parameters from 1950 to 2010 in Chad, Central Africa. The results show that Chad is the one of world’s sunniest countries. Each year, Chad receives more than 3030.91 ± 176.33 hours of sunning corresponding to 8.9 hours daily. Likewise, a strong north-south gradient is noted over Chad. For instance, the daily insolation is 10 ± 0.41 hours in the north, 8.85 ± 1.1 hours in the center and 7.75 ± 1.8 hours in the south. Furthermore, there is a marked seasonality of sunshine duration with maximums in dry season and minimums during the rainy season. The lowest values of sunshine duration are found in August. On the contrary, maximums are recorded from November to February with values greater than 9.5 hours per day. Moreover, the annual anomalies study allowed determining three great periods in terms of sunshine variability in Chad. Firstly, the period between 1950 to 1970 (named humid period) is characterized by the lowest values of sunshine duration in Chad. Secondly, from 1970 and 1990, the region suffered an unprecedented drought which resulted in an increase of sunstroke duration in Chad. And finally, the period from 1990 to 2010 called the return period is characterized by a rapid year-to-year fluctuations of insolation duration. Unlike to surface temperature, we have also shown that there is a direct relation between the duration of insolation and the meteorological parameters such as precipitations and relative humidity.

关键词： Sunshine duration Solar Energy Climate Variability Chad Central Africa

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Pure Condition of Both 6R Serial and 3-PRS Parallel Robots Using grassmann-Cayley Algebra

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Modern Mechanical Engineering 2018年第4期8卷 233-248页

作者： Luc djimon Clément Akonde Alain Adomou Tognon Clotilde guidi département du génie industriel et maintenance (gIM) Institut Universitaire de Technologie (IUT) de Lokossa Université Nationale des Sciences Technologies Ingénierie et Mathématiques (UNSTIM) d’Abomey Benin Institut Universitaire de Technologie (IUT) de Lokossa Université Nationale des Sciences Technologies Ingénierie et Mathématiques (UNSTIM) d’Abomey Benin

This research presents Pure Condition approach, which has used in analyzing simultaneously the singularity configuration and the rigidity of mechanism. The study cases analysis is implemented on variable joints orientation of 6R (Revolute) Serial Manipulators (SMs) and variable actuated joints position of 3-PRS (Prismatic-Revolute-Spherical) Parallel Manipulators (PMs) using grassmann-Cayley Algebra (gCA). In this work we require in Projective Space both Twist System (TS) and global Wrench System (gWS) respectively for serial and parallel manipulators which represent the Jacobian Matrix (J) in symbolic approach to Plücker coordinate vector of lines and unify framework on static and kinematics respectively. This paper, works, is designed to determine geometrically at symbolic level the vanished points of inverse form of this Jacobian Matrix (J) which called superbracket in gCA. The investigation vary to those reported early by introducing gCA approach on the singularity of serial robot, variable joints orientation and actuated positions on robot manipulators (RMs) to analyze rigidity frame work and singularity configuration which involve simultaneously Pure Condition. And the results also revealed a single singularity condition which contains all particulars cases and three general cases such as the shoulder, elbow and wrist singularity for SMs while double, single and undermined singularities respectively for 3-PRS, 3-PRS and 3-PRS PMs which contain all generals and particulars cases.

关键词： Pure Condition 6R SMs 3-PRS PMs Superbrackets gCA

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