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  • 1
    Electronic Resource
    Electronic Resource
    An integrated NMT-based CAE environment — Part I: Boundary-based feature modeling utility (1993)
    Springer
    Engineering with computers 9 (1993), S. 210-219 
    Details
    ISSN: 1435-5663
    Keywords: Features ; Geometry-Based reasoning ; Geometry modeling utility ; Non-Manifold topology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract The integration of CAD, CAM and CAE is far from a commercial reality. Feature technology has been identified as a key element in bridging many of the integration gaps. This two-part paper emphasizes an integrated NMT-based environment that serves the needs of both geometry and feature-based applications. Part I describes a feature modeling utility that coexists with commercial CAD systems by providing external feature-based functionality and making it available to application programs. A non-manifold topologybased system, called TAGUS, is used to represent the model geometry and provide the foundation for features representation. The architecture of a feature-based analysis system is described and, finally, the automated design of the feed system for injection molds is presented as an example to illustrate the application of the feature modeling utility. A detailed description of this application is the focus of the companion paper (Part II).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01201901
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    An integrated NMT-based CAE environment — Part II: Applications to automated gating plan synthesis for injection molding (1993)
    Springer
    Engineering with computers 9 (1993), S. 220-230 
    Details
    ISSN: 1435-5663
    Keywords: Automated gating design ; Features ; Geometry-based reasoning ; Non-manifold topology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract The focus of this paper is on the application of the integrated non-manifold-topology-based CAE environment described in the companion paper (Part I). The need for both a geometry-based and a feature-based environment is illustrated through the application of the features modeling utility to automate the procedure for injection mold design and, more specifically, gating design. The gating plan synthesis system described in this paper automatically determines an initial gating configuration based on a features representation of the part and a knowledge-base that captures some of the design rules used in practice. The Features Modeling Utility (FMU), a Topology And Geometry Utility System (TAGUS) and an automatic mesh generator, OCTREE, are used to identify and query features and to perform geometric reasoning about the part. The methodology used, implementation details and examples of test cases are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01201902
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Automatic mesh generation from solid models based on recursive spatial decompositions (1989)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 28 (1989), S. 2469-2501 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: This paper introduces a two-stage algorithm for the automatic conversion of solid models into finite element meshes. In Stage 1 the solid is approximated by a collection of variably sized cells generated by recursive spatial decomposition and stored in a logical tree. In Stage 2 the approximating cell structure, which includes cells that are wholly inside the solid (IN) as well as cells that are neither inside nor outside (NIO), is transformed into a finite element model. IN cells are directly mapped into finite elements while NIO cells are decomposed according to their topologically complexity through either template mapping or recursive element extraction. Although specifically designed for adaptive remeshing, the algorithm is of general use and can be implemented in any Solid Modelling System that supports Boolean operations on solids and maintains a complete boundary representation. Core algorithms for Stages i and 2 are rigorously developed to insure their applicability within a genuinely automatic procedure. Specific issues related to boundary evaluation and decomposition procedures are identified and discussed. The implementation of the algorithm into an experimental system based on the PADL-2 solid modeller is described. The paper concludes with a comparative study of existing meshing algorithms based on recursive spatial decompositions.
    Additional Material: 21 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620281102
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  • 4
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    An integrated NMT-based CAE environment ? Part I: Boundary-based feature modeling utility (1993)
    Springer
    Details
    Publication Date: 1993-12-01
    Print ISSN: 0177-0667
    Electronic ISSN: 1435-5663
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Published by Springer
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    PAPER CURRENT
  • 5
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    An integrated NMT-based CAE environment ? Part II: Applications to automated gating plan synthesis for injection molding (1993)
    Springer
    Details
    Publication Date: 1993-12-01
    Print ISSN: 0177-0667
    Electronic ISSN: 1435-5663
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Published by Springer
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    PAPER CURRENT
  • 6
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    Geometrical and topological issues in octree based automatic meshing (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Finite element meshes derived automatically from solid models through recursive spatial subdivision schemes (octrees) can be made to inherit the hierarchical structure and the spatial addressability intrinsic to the underlying grid. These two properties, together with the geometric regularity that can also be built into the mesh, make octree based meshes ideally suited for efficient analysis and self-adaptive remeshing and reanalysis. The element decomposition of the octal cells that intersect the boundary of the domain is discussed. The problem, central to octree based meshing, is solved by combining template mapping and element extraction into a procedure that utilizes both constructive solid geometry and boundary representation techniques. Boundary cells that are not intersected by the edge of the domain boundary are easily mapped to predefined element topology. Cells containing edges (and vertices) are first transformed into a planar polyhedron and then triangulated via element extractor. The modeling environments required for the derivation of planar polyhedra and for element extraction are analyzed.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: Rensselaer Polytechnic Inst., Workshop on the Integration of Finite Element Modeling with Geometric Modeling; 15 p
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    A hierarchical structure for automatic meshing and adaptive FEM analysis (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A new algorithm for generating automatically, from solid models of mechanical parts, finite element meshes that are organized as spatially addressable quaternary trees (for 2-D work) or octal trees (for 3-D work) is discussed. Because such meshes are inherently hierarchical as well as spatially addressable, they permit efficient substructuring techniques to be used for both global analysis and incremental remeshing and reanalysis. The global and incremental techniques are summarized and some results from an experimental closed loop 2-D system in which meshing, analysis, error evaluation, and remeshing and reanalysis are done automatically and adaptively are presented. The implementation of 3-D work is briefly discussed.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: Rensselaer Polytechnic Inst., Workshop on the Integration of Finite Element Modeling with Geometric Modeling; 34 p
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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