Browsing by Author "Belaid, Siham"

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Condition-based maintenance for the optimization of smart manufacturing processes using infrared thermography
(Université M'Hamed Bougara Boumerdes: Faculté de Technologie, 2019) Belaid, Siham; Adjerid, Smail(Promoteur)
In The framework of European Union initiative, ERASMUS + program, Capacity Building in the field of Higher Education project entitled "Algerian National Laboratory for Maintenance Education” ANLMED, project no. 586035-EPP-1-2017-1-DZ EPPKA2-CBHE-JP (https://anlmed.com/) was funded and implemented starting March 2018. One of the objectives of this project is related to the mobilities of students from four Algerian universities, including the Université M’Hamed Bougara de Boumerdes (UMBB) to European universities. During the mobility in “Dunarea de Jos” University of Galati (UDJG) was elaborated and completed the Master thesis entitled “Conditional Based-Maintenance for the Optimization of Intelligent Manufacturing Processes by Infrared Thermography” (Maintenance conditionnelle pour l'optimisation des procédés de fabrication intelligents par thermographie infrarouge). In the thesis are elaborated and developed, in the theoretical part, the basics of maintenance, in general, and the in particular the fundamental concepts Conditional Based-Maintenance (CBM). Later on, the concept related to condition monitoring (CM) techniques, in different industrial applications are presented, such as: oil analysis, infrared thermography (IRT), vibration analysis, ultrasonic analysis, acoustic analysis and electrical analysis. An entire chapter is dedicated to infrared thermography. This choice is appointed by the potential and efficiency of this diagnostic method, that allows to detect temperature variation, revealing the appearance of major defects that may affect the operational safety of the production equipment. The experimental part was conducted in the Mechatronics Laboratory of "Dunarea de Jos" University of Galati - Faculty of Engineering, Department of Manufacturing Engineering and included the conditional monitoring of smart manufacturing process, in this case of Additive Manufacturing (AM) process using Fusion Deposit Modelling (FDM) technology, performed using two 3D printers: Creality CR-10S Pro and Ultimaker 2+. The main purpose of the research was to analyse and test three different methods of conditional-based maintenance using three types of conditional monitoring, namely: vibration (by vibrometers), sound (by sound level meters) and temperature (by thermal camera and infrared thermography). Moreover, a probabilistic model using Bayesian Networks was designed, in order to develop a condition-based maintenance model for the AM process. This technique and approach can represent a successful integration of a large number of data monitoring sets and complex modelling and analysis capabilities are achieved that can lead in the end at an optimisation of the AM process. In conclusion, the thesis addresses complex fundamental and experimental researches with wide application in Industrial Engineering field, and specifically in Condition-Based Maintenance
Damage diagnostic of ball Bearing using vibration analysis
(Université M'Hamed Bougara Boumerdes : Faculté de Technologie, 2021) Belaid, Siham; Lecheb, Samir; Chellil, Ahmed; Djellab, Amira; Mechakra, Hamza; Kebir, Hocine
Maintenance of any machinery is very important in view of downtime of machinery. The bearing sector is one of the examples without which not single rotating machinery work, Our work is devoted first to a study of static behavior by determining the stress, strain and displacement, then dynamic behavior by determining the first four naturals frequencies. Secondly the dynamic analysis of the Bearing with defect as a function of crack size and location. Finally, the analysis of the results obtained in terms of residual parameters, allow us to draw a roadmap for the diagnosis and maintenance of bearings.
Maintenance conditionnelle par analyse vibratoire : application aux roulements à bille
(Université M'Hamed Bougara : Faculté de Technologie, 2023) Belaid, Siham; Lecheb, Samir(Directeur de thèse)
On sait que les roulements à billes ont des effets considérables sur les vibrations du système de transmission, surtout en présence de défauts locaux ainsi que de fissures. ? cet effet, le présent document est consacré sur le diagnostic de la croissance des fissures dues aux chocs et aux vibrations des roulements à billes à l'aide d'une analyse vibratoire. Notre travail est d'abord consacré à l'étude du comportement statique du roulement à billes en déterminant les contraintes et les déplacements, puis l'étude de son comportement dynamique en déterminant les cinq premières fréquences naturelles. Ensuite, une étude d'analyse dynamique du roulement a été effectuée avec des défauts en fonction de la longueur et de l'emplacement des fissures. Les résultats obtenus, ont montré clairement que les fréquences naturelles diminuent de manière non-linéaire avec la croissance de la longueur de la fissure, d'autre part les contraintes augmentent avec la présence des points singuliers de la fissure. Cette diminution des fréquences naturelles peut être utilisée comme indicateur de l'état de défaillance, c'est-à-dire utilisée comme paramètre de diagnostic et de dépistage, ainsi que pour mettre en évidence la durée de vie en fatigue du roulement