This paper presents a programmed link between the electromagnetic transients program EMTP-RV and the finite element field solver FLUX3D. The model created in FLUX3D is driven from simulation designs ...in EMTP-RV. The test cases presented in this paper demonstrate that the coupling method is numerically robust and with sufficient accuracy. This approach benefits from EMTP advantages in modeling large-scale networks and from field solver advantages for detailed representation of power transformer iron cores.
Using schematic drawings and practical experiments in explaining physics-engineering phenomena such as electric machines to students, are the common tools used in higher education. Having applied ...those instruments; still, misconceptions on grasping the nature of magnetic fields among students have been noticed. Basically, understanding the basic functional principles in these courses needs three-dimensional (3D) visual imagination that the student must have or develop. Since students come to the general courses with different theoretical backgrounds, they build their own mental representations to understand the functioning of a physical system and most of the students failed to distinguish the source of the magnetic field and others confuse magnetic force and magnetic field. Identifying students' misconceptions and correcting them at the early stages of the basic courses in the engineering program are of great importance since the student will build upon them their further knowledge of electromagnetic fields, especially in the requisite courses. This paper explores how incorporating an illustrative finite element software, namely, Flux3D in teaching, as experimental software, will let students visualize and build the correct imagination of physics theories. The studied action research has been conducted over two cycles, which comprises seven weeks and detailed investigations were analyzed with different statistical approaches. The study shows that using 3D simulations as a virtual-lab-based teaching method has positive outcomes and fosters learning, which is the main contribution of the study.
2D and 3D Numerical Models of Inductive SFCL Kozak, S.; Janowski, T.; Wojtasiewicz, G.
IEEE transactions on applied superconductivity,
06/2007, Letnik:
17, Številka:
2
Journal Article, Conference Proceeding
Recenzirano
The Superconducting Fault Current Limiter (SFCL) can be used to limit the short-circuit current level in electrical networks. The inductive SFCL works like a transformer with shorted secondary HTS ...winding. Because of the iron core, the inductive SFCL is not axially symmetrical and should be modeled in 3D geometry. On the other hand, the 2D modeling gives much more computational advantage, in comparison with 3D modeling. The paper explains in what case the 3D modeling of inductive SFCL can be replaced by much simpler 2D modeling.
Depuis plusieurs années les chiffres de l'insécurité routière montrent la nécessité de développer un outil technologique qui vise à connaitre le comportement de véhicules deux roues motorisés (2RM) ...afin d'améliorer leursécurité. De cette problématique découle nos travaux de recherche qui s'inscrivent dans le cadre de projet METRAMOTO (MEsure du TRAfic des deux-roues MOTOrisés pour la sécurité routière et l'évaluation des risques)L’objectif principal visé concerne la modélisation, le dimensionnement et l'optimisation d'un capteur hybride constitué d'une part de boucles électromagnétiques et d'autre part de capteurs de chocs piézo-électriques. L’idée consiste à utiliser les boucles électromagnétiques pour discriminer la présence des 2RM de celle des autresvéhicules, associées à des segments piézo-électriques pour détecter le choc produit par le passage des roues desdifférents véhicules, le tout associé à un algorithme de gestion et de traitement de données. Aujourd'hui redimensionnement des systèmes de détection à base de boucles électromagnétiques ou de câble piézo-électriquese fait de manière expérimentale sur des sites contrôlés en utilisant plusieurs types de véhicules. Cette technique gourmande en temps nécessite une série importante d'essais couteux et dangereux. La présente étude a pour butde modéliser les différentes interactions entre le capteur hybride étudié et les véhicules en vue de son dimensionnement. Des modèles électromagnétiques et électromécaniques sont développés pour décrire les différentes interactions se produisant entre les boucles électromagnétiques d'une part, les boucles électromagnétiques et les véhicules d'autre part ainsi que celles des roues de véhicules et le câble piézoélectrique.Sur la base de ces modèles établis, une démarche générale est élaborée conduisant au dimensionnement du capteur hybride pour une route donnée. Nous nous sommes également intéressés au traitement des données issues du capteur hybride pour lesquelles nous proposons une approche d'identification des différentes catégories de véhicules dont les 2RM. Deux configurations de capteurs pour deux routes différentes sont alors proposées.Elles sont associées à des algorithmes de traitement de données permettant l'acquisition des signaux de boucles et de câbles, la distinction des différents types de véhicules, l'estimation de la position des véhicules sur la chaussée ainsi que la mesure de la vitesse de véhicules.
For several years the road safety numbers show the need to develop a technological tool that aims to know thepowered two wheelers vehicles behavior (2PW) to improve their security. From this problematic arise our researchworks that come under the project METRAMOTO (Powered two wheelers traffic measurement for road safety andrisks assessment). The main objective is modeling, sizing and optimization of an hybrid sensor consisted ofelectromagnetic loops and piezoelectric shock sensors. The idea is to use electromagnetic loops to discriminate the2PW presence from the other vehicles, combined with piezoelectric segments to detect the shocks produced by thevehicles wheels passage, all associated with a management algorithm and data processing. Today the sizing of thedetection systems based on electromagnetic loops or piezoelectric cables is done experimentally on controlled sitesusing several vehicles types. This technique requires significant test series which are costly and dangerous. Thisstudy aims to modeling the different interactions between the studied sensor and vehicles in order to its sizing.Electromagnetic and electromechanical models are developed to describe the different interactions that take placebetween electromagnetic loops on the one hand, between electromagnetic loops and vehicles on the other handand those between vehicle wheels and piezoelectric cable. On the basis of established models, a general approachis elaborated driving to sizing the hybrid sensor for any given road. We are also interested to the data processingcoming from the hybrid sensor for which we propose an approach to identifying the different vehicle categoriesincluding the 2PW. Two sensor configurations for two different roads are then proposed. They are associated atdata processing algorithms allowing the acquisition of loops and cables signals, the distinction between the differentvehicles classes, the estimation of the vehicles positions on the road and the measuring of their speed.
Flux concentrated permanent magnet transverse flux machine (FCPM-TFM) that is designed to achieve a compact design for in-wheel applications, has been set under test experiments to verify the ...published investigations that are demonstrated in and achieved through many computer simulations via using FLUX3D, a 3D finite element (FE-) package from Cedrat. The study in this paper includes generator and motor operations of the FCPM-TFM. Starting with generator electromotive force i.e., back EMF test, where the machine is operated as a generator for different speeds. The induced voltage waveform and cogging torque have been estimated via introducing 2D grids in certain positions of a two pole pitch segment and compared to the outcome of the software. The flux linkage has been examined by using an AC method, while including core losses, where the effects of saliency are illustrated. Motor operation is done through full block control. The measured quantities have been compared to the simulations results.
