4 results on '"Gaha, Raoudha"'
Search Results
2. Proposal of a new process of products environmental assessment/ improvement on CAD phase
- Author
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Gaha, Raoudha, YANNOU, Bernard, Benamara, Abdelmajid, Laboratoire de Génie Mécanique [Monastir] (LGM / ENIM), École Nationale d’Ingénieurs de Monastir (ENIM), Laboratoire Génie Industriel - EA 2606 (LGI), and CentraleSupélec
- Subjects
[SPI.OTHER]Engineering Sciences [physics]/Other ,[INFO.INFO-IA]Computer Science [cs]/Computer Aided Engineering ,[INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation ,[INFO.INFO-AI]Computer Science [cs]/Artificial Intelligence [cs.AI] - Abstract
International audience; Most of methodologies, concepts and tools, which integrate Computer Aided Design (CAD) and Life Cycle Assessment (LCA) systems and aim at ecodesigning, are generally oriented to the environmental assessment. The environmental improvement is treated only in a few works; however it is a pivotal phase in the eco-design process. In this paper, we propose a new environmental improvement process based on the remaining Degrees of Freedom (DoFs) for CAD designer on which he can act to eco-design his/her CAD model. The originality in this process is the expression of a CAD model environmental impacts in function of CAD designer DoFs, aiming at help non environment experiment designer to eco-design products in CAD phase. For this, first, we present the concept of DoFs and we use it to identify the CAD designer action zone. Second, we establish the impact matrix of DoFs in each life phase, then; we develop the global impact matrix .The assembly of EIs by linear summation of the matrix columns shows the most impacting ones. Finally, we consider a case study to valid our proposed approach and results are shown in function of DoFs.
- Published
- 2017
3. Comparison between CAD models based on geometric information
- Author
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Letaief, Montasser, Billah, Tlija, Mehdi, Gaha, Raoudha, LOUHICHI, Borhen, and Association Française de Mécanique
- Subjects
Up ,comparison ,geometric entity ,CAD Model ,[PHYS.MECA]Physics [physics]/Mechanics [physics] ,geometric information ,Digital Mock - Abstract
Colloque avec actes et comité de lecture. Internationale.; International audience; The development of complex products is based on the exploitation of powerful Digital Mock-Up (DMU). Indeed, the three-dimensional geometric modeling of mechanical components constitutes an indispensable activity for the design. Computer-aided design (CAD) tools allow faithful and accurate representation of the product shape. This shape is the basic support used in the design phase and subsequent processes. In order to satisfy customer needs and ensure the best ratio price-quality, the geometric definition evolves, i.e., changes are made to the product shape according the product life cycle. Different models used and maintained by the specialists must also evolve in a coherent way. In fact, this evolution impacts the technical data specific to each discipline, as manufacturing , calculation and assembly models. Thus, for each contribution of a multidisciplinary participant, the geometric model data accumulate. This conducts industrial companies to retain and reuse data corresponding to reliable and approved products. The company knowledge and experience are capitalized as well as skills are better exploited. The proposed work in this paper proposes a tool for comparing geometric models. The comparison is founded on two main steps. The first step constitute an aggregation and filtering step. The studied model is selected as a reference one. Similar models are automatically determined according to the geometric information of CAD entities. The second step is based on geometric entity characteristic as comparison criterion to refine results. The entity identity comprises the Boundary Representation (B-Rep) model. The proposed tool is required a comparison between the studied model and the library of models already realized and approved by the company as well as to choose the most similar product. This choice allows to take advantage of acquired experiences as cost of production, problems encountered, etc. Several services will benefit from the difference characterization based on geometric information: the engineering to standardize the components, using similar models for calculation or manufacturing, etc. Otherwise, the proposed tool allows to reduce production time that decreases product cost.
- Published
- 2017
4. ECO-CONCEPTION ET CAO PARAMETRIQUE
- Author
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Gaha, Raoudha, Laboratoire de Génie Mécanique [Monastir] (LGM / ENIM), École Nationale d’Ingénieurs de Monastir (ENIM), Ecole Nationale d'ingénieurs de Monastir (Tunisie), Abdemajid BENAMARA, and Bernard YANNOU
- Subjects
scenarios ,scénario ,Degrés de liberté ,[INFO.INFO-IA]Computer Science [cs]/Computer Aided Engineering ,CAO ,[SPI.MECA.GEME]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanical engineering [physics.class-ph] ,eco-design ,Eco-conception ,degrees of freedom ,Eco-feature ,environmental assessment ,CAD ,Evaluation environnementale ,ACM: I.: Computing Methodologies - Abstract
To assess and attempt to curb the ever-increasing environmental impacts (EIs) of industrial products throughout their life cycle, eco- design solutions have been implemented and have evolved considerably during the last decade. A lot of research works have taken EIs into account in the early design stages. However, few studies have focused on the reduction of EIs in the final stages of design such as the detailed design phase of CAD (Computer Aided Design). This is probably due to the few possibilities of designers to practically act so as to reduce EIs of its product. However,the detailed design phase is a key step in the realization of eco-products. On the one hand, the choices made during this phase are responsible for generating more than 60% of EIs of a product throughout of its life cycle and, on the other hand, this phase embeds a large amount of information that allows accurate quantifications of EIs. The objective of this thesis is therefore to develop a new eco-design methodology aimed at reducing the EIs of a product during CAD phase. A general methodology is presented, which is based on the «ELA» process (Evaluate - Locate, Act). This methodology consists in, first, environmentally assessing a given geometry and, then, locating impactful sources for finally acting on target areas to result in an eco- designed geometry with an optimal life cycle scenario in terms of ecology. The geometry’s environmental evaluation is primarily based on the information linked to differentassigned features. Therefore, eco-feature concept and the corresponding environmental assessment model based on the eco-features have been developed. This model allows the designer to evaluate in real time the environmental impacts of its geometric model with possible life scenarios by allowing him/her to locate the most influence parameters related to eco-features on the eco-design of its product. This model forms the first part of the «ELA» process, since it is necessary to act on the sources of impacts in order to achieve an eco-designed geometric model, once sourceshave been located. To that end, a model determining the degrees of freedom oriented eco-design is developed. This model forms the second part of the «ELA» process. A software platform named ELA Green-CAD has been developed based on these models.; Pour évaluer et tenter de juguler l’augmentation continue des impacts environnementaux (IEx) des produits industriels tout au long de leur cycle de vie, des solutions d’éco-conception ont été mises en oeuvre et ont considérablement évolué durant cette dernière décennie. La prise en compte des IEx dès les premières phases de conception fait l’objet d’un grand nombre des travaux de recherche. Cependant, peu de recherches se sont intéressées à la réduction des IEx lors des dernières phases de conception comme celle de la phase de conception de détail en CAO (conceptionassistée par ordinateur). Cela est probablement dû à la zone d’action assez réduite du concepteur pour agir et réduire les IEx de son produit. Pourtant, la phase de conception de détails est une phase clé dans la réalisation des écoproduits ; d’une part parce que les choix effectués lors de cette phase sont responsables de la génération deplus de 60% des IEx d’un produit tout au long de son cycle de vie et, d’autre part, parce que cette phase contient une grande quantité d’informations qui permet une quantification précise des IEx. L’objectif de cette thèse est, par conséquent, de développer une nouvelle méthodologie d’éco-conception ayant pour but de réduire les IEx d’un produit lors de la phase de CAO. Une méthodologie générale est présentée, qui est basée sur le processus « ELA » (Evaluer-Localiser, Agir). Cette méthodologie consiste, d’abord, à évaluer environnementallement une géométrie donnée et, par la suite, à localiser les sources d’impacts et, enfin, à agir sur les zones cibles pour aboutir à une géométrie éco-conçue avec un scénario de vie optimal en termes d’environnement. L’évaluation environnementale d’une géométrie est basée essentiellement sur les informations attribuées aux différents features qui la composent. De ce fait, le concept d’éco-feature ainsi que le modèle d’évaluation environnementale basée sur ces éco-features ont été développés. Ce modèle permet au concepteur d’évaluer en temps réel les impacts environnementaux de son modèle géométrique avec les différents scénarios de vie possibles tout en lui permettant de localiser les paramètres liés aux éco-features les plus influençant sur l’éco-conception de son produit. Ce modèle forme la première partie du processus « ELA », puisqu’il est nécessaire d’agir sur les sources d’impacts afin d’aboutir à un modèle géométriqueéco-conçu, une fois les sources localisées. Pour cela un modèle déterminant les degrés de liberté orientés éco-conception est développé. Ce modèle forme la deuxième partie du processus « ELA ». Une Plateforme de validation du processus d’éco-conception basée sur les features est développée sous forme d’une interface homme/machine.Cette plateforme, dénommée ELA Green-CAD, rassemble les modèles développés en un seul logiciel.
- Published
- 2014
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