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Partial Discharge Activity Diagnosis in Electrical Cable Terminations Using Neural Networks
Abdelkader Elaggoune,Tahar Seghier,Boubakeur Zegnini,Belkheiri Mohammed 한국전기전자재료학회 2021 Transactions on Electrical and Electronic Material Vol.22 No.6
The electrical cable is an essential equipment in electricity transportation and distribution which are generally carried out using its types consisting in overhead lines or underground cables. The terminations are among the primordial accessories in electrical cable, they are intended to cover and protect the ends presenting the weak point of failure of an electrical cable because in these zones the electrical stress increases so much. Consequently, partial discharge activity will eventually occur and develop into arcing (Elaggoune et al. in Deuxième Conférence Internationale Sur La Maintenance, La Gestion, La Logistique Et L’électrotechnique, Enset D’oran, Algeria pp 1–5, 2012; Elaggoune in Localisation des sources potentielles des décharges parasites créées, par un dispositif expérimental de détection des Décharges Partielles dans un câble de l’énergie électrique.mémoire de magister, Université de Laghouat, Algérie, 2012; Goyal in Ind Eng Lett 4:15–20, 2014). Therefore, the terminations must be diagnosed periodically in order to avoid an insulation system breakdown, which causes a power outage and consequently excessive economic losses. The objective of this work is to assess the health of electrical cable terminations usingthedissolved gas analysis which is an eff ective chemical method toguarantee a detection of partial discharges in cable terminations (Samsudin et al. in Incipient fault detection in 33/11kV power transformers by using combined dissolved gas analysis technique and acoustic partial discharge measurement and validated through untanking, Modern Electric Power Systems (MEPS), Wroclaw, Poland, pp 1–6, 2010; Faisal et al. in Int J Electr Eng Inform 4: 186–201, 2012; Kumpulainen in Aspects and directions of internal arc protection, Doctoral Thesis, University Of Vaasa, Finland 2016; Vähämäki in Arc protection as integrated part of line protection relays, See http://www.cigaproject.ch/wp/docs/Arc% 20pro tection%20integrated%20in%20protection%20relays.pdf, 2020). However, this method failed to identify this phenomenon in some cases. To remedy with this problem, Radial Basic Functions neural network is applied as simulation tool. Therefore, the Radial Basic Functions neural network, based on dissolved gas analysis, can be used successfully in monitoring electrical cable terminations against partial discharges phenomenon.
Abdelkader Saoula,Sid Ahmed Meftah 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.4
This paper treats the distortional and shear deformation eff ects on the elastic lateral torsional buckling of thin-walled box beam elements, under combined bending and axial forces. For the purpose, a nonlinear kinematic model based on higher order theory is used applicable to both short and long thin-walled box beams. Because in the kinematic model of the higher order theory integrates additional fl exibility terms related to shear, distortion and warping eff ects, it accurately predicts the lateral torsional buckling of the straight box beams. Ritz’s method is adopted as solution strategy in order to obtain the nonlinear governing equilibrium equations, then the buckling loads are computed by solving the eigenvalue problem basing on the singularity of the tangential stiff ness matrix. Owing to fl exural–torsional and distortional couplings, new matrices are obtained in both geometric and initial stress parts of the tangent stiff ness matrix. The proposed method with the new stiff ness terms, is effi cient and accurate in lateral torsional buckling predictions, when compared with the commercial FEM code ABAQUS results. Based on the existing European guidelines EC3, an extensive numerical investigation is performed to demonstrate the eff ects of both shear and distortional deformations on the moment carrying capacity. The convenience of the model is outlined and the limit of models developed without shear and distortion deformation eff ects on lateral buckling loads evaluation is discussed.
Abdelkader Stouti 원광대학교 기초자연과학연구소 2017 ANNALS OF FUZZY MATHEMATICS AND INFORMATICS Vol.14 No.2
In this paper, we first introduce the notion of (α, β)-intuitionistic fuzzy order relation for any two positive reals numbers α and β such that (α, β) ∈]0, 1] × [0, 1[ with α + β ≤ 1. Secondly, we prove the existence of a maximal and a minimal (α, β)-intuitionistic fuzzy fixed points. Also, we establish the existence of the greatest and the least (α, β)-intuitionistic fuzzy fixed points. Furthermore, we give an (α, β)-intuitionistic fuzzy version of Tarski’s fixed point Theorem.
Abdelkader Karas,Mohamed Bouzit,Mustapha Belarbi,Redha Mazouzi 국제구조공학회 2015 Steel and Composite Structures, An International J Vol.19 No.6
This paper presents a contribution to improving an analytical thermo-mechanical modeling of Oxley's machining theory of orthogonal metals cutting, which objective is the prediction of the cutting forces, the average stresses, temperatures and the geometric quantities in primary and secondary shear zones. These parameters will then be injected into the developed model of Karas et al. (2013) to predict temperature distributions at the tool-chip-workpiece interface. The amendment to Oxley's modified model is the reduction of the estimation of time-related variables cutting process such as cutting forces, temperatures in primary and secondary shear zones and geometric variables by the introduction the constitutive equation of Johnson-Cook model. The model-modified validation is performed by comparing some experimental results with the predictions for machining of 0.38% carbon steel.
Secure Authentication Approach Based New Mobility Management Schemes for Mobile Communication
Abdelkader, Ghazli,Naima, Hadj Said,Adda, Ali Pacha Korea Information Processing Society 2017 Journal of information processing systems Vol.13 No.1
Mobile phones are the most common communication devices in history. For this reason, the number of mobile subscribers will increase dramatically in the future. Therefore, the determining the location of a mobile station will become more and more difficult. The mobile station must be authenticated to inform the network of its current location even when the user switches it on or when its location is changed. The most basic weakness in the GSM authentication protocol is the unilateral authentication process where the customer is verified by the system, yet the system is not confirmed by the customer. This creates numerous security issues, including powerlessness against man-in-the-middle attacks, vast bandwidth consumption between VLR and HLR, storage space overhead in VLR, and computation costs in VLR and HLR. In this paper, we propose a secure authentication mechanism based new mobility management method to improve the location management in the GSM network, which suffers from a lot off drawbacks, such as transmission cost and database overload. Numerical analysis is done for both conventional and modified versions and compared together. The numerical results show that our protocol scheme is more secure and that it reduces mobility management costs the most in the GSM network.
STOCHASTIC ACTIVITY NETWORKS WITH TRUNCATED EXPONENTIAL ACTIVITY TIMES
ABDELKADER, YOUSRY H. 한국전산응용수학회 2006 Journal of applied mathematics & informatics Vol.20 No.1
This paper presents an approach for using right-truncated exponentially distributed random variables to model activity times in stochastic activity networks. The advantages of using the right-truncated exponential distribution are discussed. The moments of a project completion time using the proposed distribution are derived and compared with other estimated moments in literature.
Abdelkader Nour,Samir Lecheb,Nouredine Chikh,M. Ouali Si-Chaïb 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.7
This work concerns the characterization of the thermodynamic behavior of the superalloy Airsist 215 (PN 3601669-7) containing cobalt. Such superalloys are used in aeronautical construction, in the hot parts of the turbine. They are frequently used for the production of the paddles. The parts in service are subjected to dynamic solicitations and thermal fluctuations over the course of time. They are responsible for modification and degradation of material properties. This can lead to the appearance of cracks and, in the long term, to the rupture of these parts. In this paper, a preliminary physical study is made on the appearance of the cracks, followed by experiments using shocks at ambient temperature and under a heating situation which simulates combustion. It is found that these dynamic loads have a significant impact on the development of the cracks that appear on the segments of the turbine nozzle. The study is devoted to the elastic shock of Hertz-Boussinesq extended to viscoelastic bodies by direct convolution of Riemann-Stielges. The interest resides in the local convolution and the distribution of stresses in the contact zone. The shock excitation method includes a deduced force in the load and disload phases. This force is an impulse which approaches a Dirac function. The sample can be modeled approximately by a system of one degree of freedom for natural frequency, damping and transfer function. The spectral response of the specified shock allows calculation of the damping. Every point of this spectrum gives the response for the linear system of the transfer function. Then, viscoelastic shock parameters are deduced.