Interoperability between CAD and simulation models

No abstract availabl

Method, models and tools for finite element model preparation integrated into a product development process

Les phases de conception et d'analyse par Elements Finis sont deux disciplines signi ficativement différentes nécessitent des représentations et des descriptions différentes du produit. Un processus entièrement automatique pour la conversion de modèles de Conception Assistée par Ordinateur (CAO) en modèles FE n'est pas possible puisqu'il n'écessite une séquence de simplifications de forme et de changements de représentations destinées a définir une description qui peut être acceptée par des solveurs EF en un temps plus court que les approches actuelles. Cette thèse pro pose une nouvelle approche pour la préparation de modèles de simulation. Ce travail s'inscrit dans un contexte de lien CAO-Calcul dont l'objectif est d'établir un lien fort entre les modèles mis en jeux lors de la préparation de modèles de simulation pour l'analyse par éléments finis. Une nouvelle représentation topologique nommée topologie de haut niveau (HLT) est proposée afin de traiter les modèles manifold et non-manifold souvent nécessaires au cours de la phase de préparation de simulation. Cette représentation maintien la sémantique CAO ainsi que le lien avec la représentation polyédrique. Sur cette base, des processus de facéttisation et de mise en conformité automatiques ainsi qu'une méthode d'identification de formes caractéristiques pour la localisation de rayons de raccordement et de trous débouchant ont été mis en place et appliques sur le modèle polyédrique.GRENOBLE1-BU Sciences (384212103) / SudocSudocFranceF

Software environment for CAD/CAE integration

International audienceComputer Aided Design (CAD) and Computer Aided Engineering (CAE) are two significantly different disciplines, and hence they require different shape models representations. As a result, models generated by CAD systems are often unsuitable for Finite Element Analysis (FEA) needs. In this paper, a new approach is proposed to reduce the gaps between CAD and CAE software's. It is based on new shape representation called mixed shape representation. This later, supports simultaneously the B-Rep (manifold and non-manifold) and polyhedral representation, and creates a robust link between the CAD model (B-Rep NURBS) and the polyhedral model. Both representations are maintained on the same topology support called the High Level Topology (HLT), which represents a common requirement for simulation model preparation. A new software environment for CAD/CAE integration based on the mixed representation is presented in this paper, thus a set of necessary tools is associated to the mixed shape representation which contribute to reduce as much as possible the time of model preparation process

Falcidieno B. From cad models to fe simulations through a feature-based approach. In: ASME 2004 international design engineering technical conferences and computers and information in engineering conference. American Society of Mechanical Engineers

ABSTRACT The preparation of simulation models from CAD models is still a difficult task since shape changes are often required to adapt a component or a mechanical system to the hypotheses and specifications of the simulation model. Detail removal or idealization operations are among the current treatments performed during the preparation of simulation models. In this paper we introduce the concept of simplification features, which allows a user to improve the efficiency of the analysis model generation process. Therefore Form Feature semantics and simulation data are attached to a polyhedral model during the preparation phase, to ease the Finite Element (FE) details identification and removal. The process flow corresponding to the insertion of the FE model preparation phase into the CAD/FEA framework is described in detail to highlight the versatility of the process according to the category of the input model as well as the main steps of the simplification process. This process flow stresses also the influence of the different information sources involved in the preparation task. They consist of the geometric and feature data of the object and the mechanical data of related to the process under examination. The need of a topological model able to represent non-manifold components is discussed as well as the need for the to user to specify the analysis attributes over the boundary of components either isolated or part of an assembly The proposed topological representation of allows the software application to combine several geometric representations such as Form feature and polyhedral representations; therefore it is possible to propagate the B-Rep information from a STEP file, as well as feature information into the polyhedral representation used during the simplification process

Computer Aided Design and Finite Element Simulation Consistency

International audienceComputer Aided Design (CAD) and Computer Aided Engineering (CAE) are two significantly different disciplines, and hence they require different shape models representations. As a result, models generated by CAD systems are often unsuitable for Finite Element Analysis (FEA) needs. In this paper, a new approach is proposed to reduce the gaps between CAD and CAE software's. It is based on new shape representation called mixed shape representation. The latter simultaneously supports the B-Rep (manifold and non-manifold) and polyhedral representation, and creates a robust link between the CAD model (B-Rep NURBS) and the polyhedral model. Both representations are maintained on the same topology support called the High Level Topology (HLT), which represents a common requirement for simulation model preparation. An innovative approach for the Finite element simulation model preparation based on the mixed representation is presented in this paper, thus a set of necessary tools is associated to the mixed shape representation. They help to reduce the time of model preparation process as much as possible and maintain the consistency between the CAD and simulation models

Method, Models and Tools for CAD-CAE Integration

International audienceComputer Aided Design (CAD) and Computer Aided Engineering (CAE) are two significantly different disciplines, and hence they require different shape models representations. As a result, models generated by CAD systems often need to be submitted to shape transformations for Finite Element Analysis (FEA). In this paper, a new approach is proposed to ease integration between CAD and CAE also outlining some patents. It is based on new shape representation called 'mixed shape representation' that supports simultaneously a B-Rep (manifold and non-manifold) and a polyhedral representation to create a robust link between the CAD and CAE environments. Both representations are maintained through the same topology description called the High Level Topology (HLT), which represents a common requirement for simulation model preparation. An innovative approach to FE model preparation based on the mixed representation is presented in this paper. Thus a set of necessary tools is associated to the mixed shape representation, which contributes to reduce, as much as possible, the time of a model preparation process

Method, Models, and tools for computer aided design and computer aided engineering integration

International audienc

Interfacing product views through a mixed shape representation: Data structures and operators

International audienc

Interfacing product views through a mixed shape representation. Part 1: Data structures and operators

International audienceCurrently, the product development process being collaborative and distributed, it relies on multiple skills and representations of the product. Obtaining the digital representation of the product model required for each product view is time consuming because component shapes and their associated data need to be adapted. In this part 1 paper, an analysis of the requirements for this shape adaptation process is performed that leads to the concepts and organization of the so-called mixed shape representation. Here, we show how B-Rep NURBS CAD models and polyhedral models combined with the concept of High Level Topology introduced enable the explicit and intrinsic description of the concepts needed to efficiently transform shapes between product views. A set of operators briefly outlined illustrates the effect of the proposed approach on the possibilities of shape transformations needed in product view interfaces. The corresponding examples demonstrate their efficiency