VDAFS—An interface to transfer surface description data between CAD systems

Rehwald, Peter

doi:10.1016/0097-8493(85)90012-3

Cited by 4 publications

(2 citation statements)

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“…Such models are named discrete models. The accuracy of a full 3D master used in metrology is determined by the quality of the process used to translate the CAD model into a data exchange file (STL: CAD models in stereo-lithography or solid freeform fabrication technologies, IGES: Initial Graphics Exchange, ASME Y14.26M [102], VDAFS: Verband der Automobilindustrie-Flächenschnittstelle or "automotive industry association -surface data interface" [149], STEP: Standard for the Exchange of Product model data, ISO 10303 [13]). The native model implemented in a CAD system is the representation used the most in discrete models, since it does not require any translation and thus leads to the best accuracy.…”

Section: Aimmentioning

confidence: 99%

Modelling and traceability for computationally-intensive precision engineering and metrology

et al. 2018

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In contrast to measurements of the dimensions of machined parts realized by machine tools and characterized by CMMs, software results are not fully traceable and certified. Indeed, a computer is not a perfect machine and binary encoding of real numbers leads to rounding of successive intermediate calculations that may lead to globally false results. This is the case for poor implementations and poorly conditioned algorithms. Therefore, accurate geometric modelling and implementations will be detailed. Based on the works of National Metrology Institutes, the problem of software traceability will also be discussed. Some prospects for this complex task will finally be suggested.

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Section: Aimmentioning

confidence: 99%

Modelling and traceability for computationally-intensive precision engineering and metrology

et al. 2018

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“…Later versions of IGES such as IGES 2.0 and IGES 3.0, published in 1982 and 1986 respectively, laid the foundation for extended and further refined later versions up to IGES 5.0 and IGES 5.x, which contain now, besides the original two and three dimensional wireframe models and associated standard dimensioning formats, also rational B-spline based curves and surfaces, solid models, finite element modeling data and a limited set of product specific data [9,10,11]. Further details and references on other standards developed in parallel to IGES, such as VDA-FS, VDA-PS and SET for the exchange of CAD data and partial product data, can be found in [12,13,14].…”

Section: Development and Current Situation In Research And Practicementioning

confidence: 99%

Solid Model Reconstruction From Trimmed Surfaces Based on B-Rep Face Sewing

Otto¹,

Ficco²,

Mandorli³

2000

Int. J. Shape Model.

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Despite international efforts to support specification and exchange of CAD data through acknowledged standards and data interfaces, in practice several problems still remain. One type of problem is related to the reconstruction and verification of CAD data containing defects. Major problems causing such defects are related to differences in the internal modeling accuracy of systems. Generated models that sometimes contain degenerated edges and faces having either almost zero length or zero area exacerbate the situation. Defects in the topology and / or the geometry of such geometric models have a severe impact on computeraided post-design processes such as finite element analysis, STL file generation, tool path generation, etc. In the meantime, until improvements can be made in the processes that generated those corrupted CAD data, correction of possible errors in CAD data can be achieved by introducing an intermediate post-processing step aimed at reconstructing an error-free, valid solid model. Within the given scope of this paper, we introduce and investigate the application of a face-sewing operator, which can be applied to CAD data based either on surface models or on solid models. Operation and quality of the model reconstruction are determined by the tolerances of spatial model space points located on the face boundaries and their distances apart. Due to the use of reference kernel architecture featuring a Brep scheme within an integrated multi-dimensional topology supporting both surface models and solid models, a CAD data interface based on a standard data exchange format and an internal translator that classifies, converts and correlates pure geometric entities, sub-setting geometric entities and topological entities, open and highly flexible system architecture in respect to considered CAD data and geometric models can be maintained.

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Neutral formats for product data exchange: The current situation

Owen¹,

Bloor²

1987

Computer-Aided Design

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VDAFS—An interface to transfer surface description data between CAD systems

Cited by 4 publications

References 0 publications

Modelling and traceability for computationally-intensive precision engineering and metrology

Modelling and traceability for computationally-intensive precision engineering and metrology

Solid Model Reconstruction From Trimmed Surfaces Based on B-Rep Face Sewing

Neutral formats for product data exchange: The current situation

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