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RISS 인기검색어
- 검색키워드
- 저자 : Mounir Hamdi (검색결과 4 건)
- 무료
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CAD model simplification using a removing details and merging faces technique for a FEM simulation
Hamdi Mounir,Aifaoui Nizar,Benamara Abdelmajid 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.11
The simulation process is currently used in the design and dimensioning of mechanical parts. With the progress of computer materials,the finite elements method (FEM) becomes the most used approach in the simulation of mechanical behaviour. The simulation process needs multiple Design-FEM loops. In order to accelerate those analysis loops, an adaptation of computer aided design (CAD) model is necessary. The adaptation step consists in the simplification of the CAD model geometry by eliminating details (holes, chamfers, fillet,etc.) and faces. In this paper, a novel technique of simplification of the CAD geometry is developed. This technique is a hybrid method based on a combination of the elimination details and merging faces. The merging of faces is based on the energetic method. With this approach, the computing time is reduced by the elimination of geometric details which do not boundary conditions. An implementation of the proposed algorithm on the Open Cascade platform is also presented. The results of the developed method are compared with a previous publication. The reduction of the computing time and the amelioration of the result precision highlight the efficiency of the presented method.
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Louhichi, Borhen,Aifaoui, Nizar,Hamdi, Mounir,BenAmara, Abdelmajid,Francois, Vincent Society for Computational Design and Engineering 2009 International Journal of CAD/CAM Vol.9 No.1
For several years, researchers have focused on improving the integration of the CAD, CAM and Analysis through a better communication between the various analysis tools. This tendency to integrate the CAD/Analysis and automation of the corresponding processes requires data sharing between the various tasks using an integrated product model. We are interested in this research orientation to CAD/CAM/Analysis integration by rebuilding the CAD model (BREP), starting from the Analysis results (deformed mesh). Because this problem is complex, it requires to be split into several complementary parts. This paper presents an original interoperability process between the CAD and CAE. This approach is based on a new technique of rebuilding the CAD surface model (Nurbs, Bezier, etc.) starting from triangulation (meshed surface) as a main step of the BREP solid model. In our work, the advantages of this approach are identified using a centrifugal pump example.
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Parametric analysis of the damage characterization tests of aluminum bulk material
Chaima Hammami,Nouha Kammoun,Hamdi Hentati,Mounir Ben Amar,Mohamed Haddar 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.10
Several models have been developed to study materials behaviors under different states of stress. In manufacturing processes, several types of stresses are observed in workpieces. In this context, this paper presents an analysis of the failure behavior of aluminum bulk specimens through parametric characterization tests covering most of these solicitations. The goal is to choose better configuration to reduce experimental tests costs later. First, numerical models used for damage characterization tests are described and validated. Johnson Cook models and stress triaxiality parameter are introduced to study the ductile damage mechanism in the material. Second, the influence of specimens geometries on characterization tests results is under investigation. Tension, compression, shear, torsion, and combined torsion-tension tests are carried out using finite element models and thermo-mechanical coupling method.
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Ramesh T.R.,Vijayaragavan M.,Poongodi M.,Mounir Hamdi,Huihui Wang,Sami Bourouis 한국통신학회 2022 ICT Express Vol.8 No.3
Vehicular ad hoc network (VANETs) has gained wide popularity such that it is necessary to incorporate trust among each node in the network. However, trust management among vehicles is a challenging task as malicious nodes are prone to disturb data transmission among different vehicles. The aim of this work is to establish the truth of consensus, to identify the malicious nodes with no further delay, by considering the decision of each vehicle on finding the trust values. The experimental analysis for the proposed approach done using the NS3 with CAIDA data set, the proposed scheme shows superior results compared to the other existing schemes for the detection rate of malicious nodes. It enhances the attack Detection Rate (DR) as 96.5% for the projected dual weighted trust evaluation technique. But, DR for the triumphing technique firecol is 74.9% and AODV is 60%. Thus, it is experimentally proved that dual weighted trust mechanism has high attack detection rate, comparatively. Also, proposed method outperforms very well with respect to the data transmission parameters like packet delivery ratio, energy Consumption and average latency comparatively over the existing mechanisms.
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