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Gaye K.,University of Ziguinchor | Coulibaly A.,LGECO | Gardoni M.,LIPPS
IEOM 2015 - 5th International Conference on Industrial Engineering and Operations Management, Proceeding | Year: 2015

This paper proposes an approach to semantic modeling of products based on an extended version of the DSM Design Structure Matrix (DSM), called here, X-DSM (extended DSM) and on the SysML formalism. This metamodel is intended to take into account the structural characteristics of the product and its behavior along the life cycle, from the design phase to its end of life. For that, first, we proposed 4 types of X-DSM matrices that are used to represent the components, design parameters, activities and the associated project's stakeholders. And then, we use SysML language diagrams to represent the behavioral views of the product at different stages of its lifecycle. The proposed metamodel complies with the SysML formalism including both the 7 UML4SysML views and 2 additional views aimed to the care of Specifications and Parametric settings. These last two views are key factors for modeling products with multiple configurations. In the second part of the article, we propose implementation architecture to exploit the functionalities of such a metamodel in collaborative design. © 2015 IEEE.

Louhichi B.,LIPPS | Abenhaim G.N.,LIPPS | Tahan A.S.,LIPPS
The International Journal of Advanced Manufacturing Technology | Year: 2014

The improvement of the simulation process requires an integration of the design and analysis models. There are two essential tasks in the design analysis process: (i) computer-aided design (CAD) which provides the geometric description of the model and (ii) the finite element method (FEM) used for mechanical behaviour simulations. The interoperability between these two tasks reduces costs and improves product quality through the acceleration of design analysis loops. Our activity fits into this research orientation by providing a method to link the FE analysis and the CAD model. This is done by reconstructing the CAD model from the FE analysis results (deformed mesh). This paper proposes a method to update the CAD geometry from the deformed mesh. This approach allows for rebuilding the CAD model after analysis by extracting geometric information from the deformed mesh. An illustration of the developed method is discussed at the end of this paper. © 2014 Springer-Verlag London.

Louhichi B.,University of Monastir | Louhichi B.,University of Sousse | Tlija M.,University of Monastir | Tlija M.,University of Sousse | And 2 more authors.
CAD Computer Aided Design | Year: 2014

For several years, Digital Mock-Up (DMU) has been improved by the integration of many tools as Finite Element (FE) Analysis, Computer Aided Manufacturing (CAM), and Computer Aided Tolerancing (CAT) in the Computer Aided Design (CAD) model. In the geometrical model, the tolerances, which specify the requirements for the proper functioning of mechanical systems, are formally represented. The nominal modeling of the parts and assemblies does not allow the prediction of the tolerance impacts on the simulation results as the optimization of mechanical system assemblability. So, improving the CAD model to be closer to the realistic model is a necessity to verify and validate the mechanical system assemblability. This paper proposes a new approach to integrate the tolerances in CAD model by the determination of the configurations with defects of a CAD part, used in a mechanical system. The realistic parts are computed according to the dimensional and geometrical tolerances. This approach provides an assembly result closer to the real assembly of the mechanical system. The Replacement of the nominal parts by the realistic ones requires the redefinition of the initially defined assembly mating constraints. The update of the mating constraints is performed by respecting an Objective Function of the Assembly (OFA). Integrating tolerances in CAD allows the visualization and simulation of the mechanical assemblies' behavior in their real configuration and the detection of possible interference and collision effects between parts which are undetectable in the nominal state. © 2014 Elsevier Ltd. All rights reserved.

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