Papers by abdelhalim zaoui
Bioelectricity, Apr 19, 2024
IEEE Transactions on Plasma Science
HAL (Le Centre pour la Communication Scientifique Directe), Dec 13, 2017
HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific re... more HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.
HAL (Le Centre pour la Communication Scientifique Directe), Oct 2, 2016
The objective of this work is based on the use of artificial neural networks (ANN) and the analys... more The objective of this work is based on the use of artificial neural networks (ANN) and the analysis by the finite elements method (FEM) to solve the inverse problem encountered in the detection of metals. The approach is used to identify the metal objects buried in the soil. The methodology used in this work is to compute the signals presenting the response of the metals detector according to the variation of the geometrical and physical parameters of the buried metal objects. This computation is performed using the finite elements method. The results obtained are used to generate a set of vectors for the training of multilayer perceptron neural network (MLP).
HAL (Le Centre pour la Communication Scientifique Directe), Nov 15, 2017
Nous proposons une méthode sans contact pour l'identification du tenseur de conductivité électr... more Nous proposons une méthode sans contact pour l'identification du tenseur de conductivité électrique d'une plaque en matériau composite à fibre de carbone (MCFC) à l'aide d'un nouveau capteur à courant de Foucault multibobines utilisant un champ magnétique tournant. Le processus de l'inversion est basé sur l'utilisation des réseaux de neurones artificiels (RNA). Le calcul direct associé aux RNA, utilise la méthode des éléments finis 3D (MEF-3D). I.
2022 2nd International Conference on Advanced Electrical Engineering (ICAEE)
HAL (Le Centre pour la Communication Scientifique Directe), Jul 3, 2018
Frequenz
Conductive flexible polypyrrole-silver (PPy-Ag) composite films were prepared on Biaxial Oriented... more Conductive flexible polypyrrole-silver (PPy-Ag) composite films were prepared on Biaxial Oriented Polyethylene Terephthalate (BOPET) substrate with surfaces treated by (3-aminopropyl) trimethoxysilane (APTMS). The surface treatment was carried out to improve the adhesion, morphology, and electrical properties of the deposited film to enhance the Electromagnetic Interference Shielding Effectiveness (EMI-SE). APTMS grafting on the BOPET substrate was confirmed by X-ray Photoelectron Spectroscopy (XPS) and Atomic Force Microscopy (AFM) analyses. All structural, morphological, and electrical features of PPy-Ag raised from different AgNO3 molar ratio were investigated. The shielding effectiveness properties, experimentally determined for the synthesized PPy-Ag films were compared to those simulated analytically and numerically based on the transmission line matrix method (TLM). Both analytical and numerical models showed a good agreement with experimental measurements. The obtained resul...
As the information age matures, a biometric identification technology will be at the heart of com... more As the information age matures, a biometric identification technology will be at the heart of computer interaction with humans and the biosphere in which they reside. Hence, the reliable information security mechanisms are needed to combat the rising magnitude of identity theft. While cryptography is a powerful tool to achieve information security, one of the main challenges in cryptosystems is to maintain the secrecy of the cryptographic keys. Template protection techniques prevent stored reference data from revealing private biometric information and enhance the security of biometric systems against attacks such as identity theft and cross matching. A critical issue in biometric systems is to protect the template of a user which is typically stored in a database or a smart card. The fuzzy vault construct is a challenging biometric cryptosystem that secures both the secret key and the biometric template by binding them within a cryptographic framework. The helper data itself do not...
─ In this work, we suggest an approach of signal inversion from sensors used in eddy current (EC)... more ─ In this work, we suggest an approach of signal inversion from sensors used in eddy current (EC) nondestructive testing (NDT). The aim is to characterize surface cracks from the EC signal. A methodology that combines 3D finite element (FEM) simulation and a data inversion by neural networks (NN) is proposed. We show that the use of a set of numerical measurements representing the EC signature of surface crack enables to remedy of the unicity problem. The obtained results show that the developed approach leads to the quantification of the crack. Index Terms ─ 3D finite element simulation, eddy current NDT, neural network, surface cracks.
Microelectronics Reliability, 2020
As everyone knows, the electromagnetic interference (EMI) modeling becomes more important over ti... more As everyone knows, the electromagnetic interference (EMI) modeling becomes more important over time. So far, many EMI models have been developed in power electronics. Almost all of them are composed of two to three impedances as well as two current or voltage sources. What distinguishes a model from another is especially its identification method, which in fact determines the most of its performances. In this paper, a new three-terminal EMI model is proposed for DC-DC converters. This model is very easy to identify, and takes into account the converter impedance behavior. The model thus proposed is a complete representation of the conducted emission behavior of the converter, where it takes not only the level of the interfering line and neutral signals, but also the complete impedance behavior of the converter. Experimental illustrations are also included to verify the validity of the proposed model. Comparison between measured and predicted results under different operating conditions with and without filter, shows that the proposed model is able to successfully predict conducted emissions up to 100 MHz with an error not exceeding 6 dB in the worst case.
Progress In Electromagnetics Research B, 2019
Since electromagnetic compatibility studies intend to predict the compliance with electromagnetic... more Since electromagnetic compatibility studies intend to predict the compliance with electromagnetic standards, an accurate computation of both common and differential mode conducted noises is necessary. Modern networks such as in automobiles that are known for supplying many electrical actuators-include many power converters and long cables (conductors) to efficiently manage power transfer. However, the presence of both converters and cables creates new electromagnetic compatibility issues. For example, the interaction between cables and converters becomes a noise source. For this reason electromagnetic compatibility study becomes more complex. Therefore, the purpose of this paper is an attempt to propose an analytical model that computes noise sources by generating conducted signals within the network at any site, meaning all along the cable according to the CISPR16 standard. Our approach primarily consists of modeling conducted noise sources generated by converters connected to the DC-network which are extracted and identified in both frequency and time domains. The electromagnetic compatibility modelling of converter's behaviour is performed by defining a mathematical switching function. The model is assessed with time domain simulations and identified by experimental measurements. Secondly, the extracted converter's model, based on equivalent noise sources, is used to predict the conducted noise inside a defined network at any location of the cable. The process of the network's modelling is realised through using the Multi-Transmission Line Method of lossless lines. This network's model is crucial for EMC analysis in order to evaluate the interaction degree between noise sources and cable parameters.
The European Physical Journal Applied Physics, 2018
This paper proposes a contactless method for the identification of the electrical conductivity te... more This paper proposes a contactless method for the identification of the electrical conductivity tensor of a carbon fiber composite materials plate using a rotating magnetic field and multi-coil eddy current sensor. This sensor consists of identical rectangular multi-coil, excited by two-phase sinusoidal current source in order to generate a rotating magnetic field and to avoid the mechanical rotation of the sensor. The fibers orientations, the longitudinal and transverse conductivities in each ply of carbon fiber composite material plate were directly determined with analysis of the impedance variation of each coil as function of its angular position. The inversion process is based on the use of artificial neural networks. The direct calculation associated with artificial neural networks makes use of 3D time-harmonic finite element method based on the A, V–A formulation.
International Journal of Remote Sensing, 2014
ABSTRACT We discuss the identification and localization of a buried object using B-scan response ... more ABSTRACT We discuss the identification and localization of a buried object using B-scan response of a ground penetration radar (GPR). We use the Finite Difference Time Domain (FDTD) and an Improved Particle Swarm Optimization (IPSO) methods association as an inverse problem. The A-scan response of the soil without the presence of any object is used in this inverse problem to estimate the physical characteristics of this soil. Then, we included these parameters into the inverse problem to characterize a cylindrical buried object from its GPR B-scan response. This response is simulated using the FDTD method. Several simulated cases of cylindrical object were tested with different radius, electrical conductivity, and depth. The proposed method allowed us to locate and identify buried objects (plastic and metal) at different depths.
Acta Electrotechnica et Informatica, 2016
Meshless methods have attracted considerable interest to the flexibility of adding or removing no... more Meshless methods have attracted considerable interest to the flexibility of adding or removing nodes in the domain of study without any need to remeshing with elements. In this paper the meshless local Petrov Galerkin (MLPG) method is applied to electromagnetic field with a moving structure. The method is an effective truly meshless method for solving PDEs. Formulations are based on a local weak form using the moving least square (MLS) for interpolation schemes. This paper focuses on the application of this method to electromagnetic linear actuators which are finding increasing use in various fields. The device presents an axisymmetric structure with a moving part displaced longitudinally with a constant step. The global magnetic force was calculated using the meshless magnetic potential solutions. Numerical results were compared to the FEM ones considering the structure both in pause and movement cases.
Frontiers of Electrical and Electronic Engineering, 2012
Induction cooking has several advantages compared to traditional heating system; however, to obta... more Induction cooking has several advantages compared to traditional heating system; however, to obtain best efficiency, it is essential to have an inductor giving homogeneous temperature on the pan bottom. For this aim, we propose a structure of inductor with four throats containing coils and optimize their distribution. In this paper, first we model magneto-thermal phenomenon of the system by a finite element method (FEM) for the mean to determine the distribution of temperature on the pan bottom by taking the nonlinearity of system. This study shows that a temperature distribution is not homogeneous. Second, with the aim to have homogeneous temperature distribution on the pan bottom, the optimal determination of throats distribution and their dimensions is obtained by genetic algorithms (GAs). The optimized structure permits to satisfy our aim.
Considering the transitory character of its operation, the linear induction launcher has dynamic ... more Considering the transitory character of its operation, the linear induction launcher has dynamic performances such as the propulsion force and the projectile velocity which are significantly dependent not only on its geometrical dimensions but also on its feeding. In this paper, the effect of the latter, which is undoubtedly of capital importance, on the performances of the device is studied thanks to a model obtained by an analytical method called the coupled circuits method which we implemented. Our study related to two different prototypes. The first is a low speed laboratory prototype which comprises only one section of inductive reels and which was used to us as practical model on which tests were carried out for the validation of the adopted method. Let us note that the results obtained with these tests are given in this present paper. As for the second prototype, of which the geometrical data are fixed by holding account of the study undertaken on the first prototype, it comp...
2014 17th International Conference on Electrical Machines and Systems (ICEMS), 2014
This paper proposes an optimal design of a middle motor integrated into a mid-drive unit for peda... more This paper proposes an optimal design of a middle motor integrated into a mid-drive unit for pedal electric cycles. This middle motor is an axial-flux permanent magnet brushless DC motor with a stator plate. Facing this plate is a rotor plate that acts as an eccentric component of a cycloidal reducer next to the stator. Both the middle motor and cycloidal reducer are easily installed on the same axle of the bike crankset. In the preliminary design, driving requirements are used to make the middle motor specifications. The numbers of stator slots and magnet poles on the rotor were chosen to achieve the best winding factor, and the winding layout was determined accordingly. A one-dimensional magnetic circuit model of the middle motor was built, and its shape was optimized utilizing a multifunctional optimization system tool. Finally, the resulting design was verified and refined by a finite element analysis. A prototype of the middle motor was fabricated with a stator made of a soft magnetic composite and integrated with a cycloidal reducer. Experimental results show that the motor has a sinusoidal back electromotive force. Additionally, it is easily controlled by sinusoidal currents with acceptable torque and speed curves.
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Papers by abdelhalim zaoui