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2 results on '"ACM: J.: Computer Applications/J.6: COMPUTER-AIDED ENGINEERING"'

1. Haptic Manipulation of Deformable CAD Parts with a Two-stage Method

Author

Zhaoguang Wang, Georges Dumont, Virtual Reality for Improved Innovative Immersive Interaction (VR4I), Institut de Recherche en Informatique et Systèmes Aléatoires (IRISA), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Cachan (ENS Cachan)-Inria Rennes – Bretagne Atlantique, Institut National de Recherche en Informatique et en Automatique (Inria), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Cachan (ENS Cachan)-Inria Rennes – Bretagne Atlantique

Subjects
0209 industrial biotechnology, Engineering, business.industry, ACM: J.: Computer Applications/J.6: COMPUTER-AIDED ENGINEERING, Modal analysis, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, 020207 software engineering, 02 engineering and technology, Deformation (meteorology), Rigid body, Industrial and Manufacturing Engineering, Finite element method, [INFO.INFO-GR]Computer Science [cs]/Graphics [cs.GR], 020901 industrial engineering & automation, Modal, Mesh analysis, Modeling and Simulation, 0202 electrical engineering, electronic engineering, information engineering, business, Focus (optics), Simulation, ComputingMilieux_MISCELLANEOUS, ComputingMethodologies_COMPUTERGRAPHICS, Haptic technology
Abstract

Real-time interaction between a designer and a deformable mock-up in Virtual Reality environments is a promising paradigm to evaluate design feasibilities. In this paper we focus on the haptic-aided deformation verification process of industrial deformable parts by combining small deformations and relatively large rigid-body motions. First, concerning the modelling process of small deformations, we propose a two-stage method extended from the linear modal analysis. In this two-stage method, modal deformation sub-spaces are pre-computed in an off-line phase, and real-time deformations are quickly reproduced by superimposing the responses of certain modes which are selected depending on interaction requirements. Based on this two-stage method, we propose a mesh analysis method to enrich the off-line pre-computations corresponding to different anticipated interaction scenarios. Furthermore, we apply a real-time division scheme which divides the deformation response process into two separate modules, so that stable haptic interactions are guaranteed. Second, concerning the purpose of global deformation verifications, we combine relatively large rigid-body motions resulting from the integration of classical motion equations and small deformations resulting from the aforementioned two-stage method. We have implemented the two-stage method to model small deformations and rigid-body motions. Real-time experiments are carried out by coupling a single haptic device with a simulation framework and experimental results validate the deformation accuracy on one hand, and demonstrate a good and stable haptic interaction experience on the other.

Published
2011
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2. Converting Hybrid Wire-frames to B-rep Models

Author

Jie-Hui Gong, Jiaguang Sun, Hui Zhang, Yi-Wen Zhang, School of Software (THSS), Tsinghua University [Beijing] (THU), Computer Aided Design (CAD ), Laboratoire Franco-Chinois d'Informatique, d'Automatique et de Mathématiques Appliquées (LIAMA), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Chinese Academy of Sciences [Changchun Branch] (CAS)-Institut National de Recherche en Informatique et en Automatique (Inria)-Institute of Automation - Chinese Academy of Sciences-Centre National de la Recherche Scientifique (CNRS)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Chinese Academy of Sciences [Changchun Branch] (CAS)-Institut National de Recherche en Informatique et en Automatique (Inria)-Institute of Automation - Chinese Academy of Sciences-Centre National de la Recherche Scientifique (CNRS)-Inria Paris-Rocquencourt, Institut National de Recherche en Informatique et en Automatique (Inria), Purdue Research and Education Center for Information Systems in Engineering (PRECISE), Purdue University [West Lafayette], cgcad, Thss, Tsinghua University [Beijing], and Tsinghua, Thss

Subjects
0209 industrial biotechnology, Loop (graph theory), Computer science, ACM: J.: Computer Applications/J.6: COMPUTER-AIDED ENGINEERING, graph theory, [INFO.INFO-GR] Computer Science [cs]/Graphics [cs.GR], ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, 02 engineering and technology, Möbius rule, model conversion, ACM: G.: Mathematics of Computing/G.2: DISCRETE MATHEMATICS/G.2.2: Graph Theory/G.2.2.0: Graph algorithms, symbols.namesake, 020901 industrial engineering & automation, ACM: I.: Computing Methodologies/I.3: COMPUTER GRAPHICS/I.3.5: Computational Geometry and Object Modeling/I.3.5.0: Boundary representations, String graph, 0202 electrical engineering, electronic engineering, information engineering, Adjacency matrix, ComputingMethodologies_COMPUTERGRAPHICS, business.industry, 020207 software engineering, Graph theory, Directed graph, [INFO.INFO-IA]Computer Science [cs]/Computer Aided Engineering, [INFO.INFO-GR]Computer Science [cs]/Graphics [cs.GR], solid reconstruction, Planar graph, 2-manifold, symbols, Graph (abstract data type), Artificial intelligence, Null graph, business, Algorithm, MathematicsofComputing_DISCRETEMATHEMATICS
Abstract

International audience; Solid reconstruction from engineering drawings is one of the efficient technologies to product solid models. The B-rep oriented approach provides a practical way for reconstructing a wide range of objects. However, its major limitation is the computational complexity involved in the search for all valid faces from the intermediate wire-frame, especially for objects with complicated face topologies. In previous work, we presented a hint-based algorithm to recognize quadric surfaces from orthographic views and generate a hybrid wire-frame as the intermediate model of our B-rep oriented method. As a key stage in the process of solid reconstructing, we propose an algorithm to convert the hybrid wire-frame to the final B-rep model by extracting all the rest faces of planes based on graph theory. The entities lying on the same planar surface are first collected in a plane graph. After all the cycles are traced in a simplified edge-adjacency matrix of the graph, the face loops of the plane are formed by testing loop containment and assigning loop directions. Finally, the B-rep model is constructed by sewing all the plane faces based on the M¨obius rule. The method can efficiently construct 2- manifold objects with a variety of face topologies, which is illustrated by results of implementation

Published
2007
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