Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK

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Das CAD-Referenzmodell als Gestaltungsleitlinie für humanorientierte aufgabenbezogene CAD-Systeme

1992 , Jansen, H.

By reason of the rather complicated handling of today's CAD systems well qualified and trained users are required. A sufficient support of the entire design work for product development is currently not yet possible. Future CAD systems based on new concepts, like the Reference Model for CAD systems, must be able to support the whole design process, dealing with the special demands of a company and its products and offering optimized working conditions for the individual design engineer.

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Wissensbasierte Rekonstruktion von Volumenmodellen

1990 , Spur, G. , Schiller, U. , Timmermann, M. , Jansen, H. , Krause, F.-L.

Limited system consistency in handling 2-D and 3-D modelers is among the serious critical aspects of modern-day CAD systems. The reconstruction method enables straightforward and familiar 2-D input methods for orthogonal views to be conveniently interlinked with the well-known virtues of solid modelling. One problem associated with his technique is, however, the unavoidable generation of excess 3-D elements resulting from projections and only barely identifiable using algorithmic techniques. An approach is described which, with the aid of knowledge-based methods, enables a far-reaching automatic reconstruction of volume models and thus helps to reduce the problem of generating inconsistent models.

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Automatic scanning and interpretation of engineering drawings

1989 , Großmann, G. , Jansen, H. , Krause, F.-L.

Successful future product development will be closely connected to an effective way of using CAD-facilities integrated in a CIM-environment. The integration aspect cannot be seen without concentrating on information processing and information acquisition problems. Todays CAD-systems do not provide possibilities for automatic capture of engineering drawing information. The increasing amount of existing engineering drawings - which in large part contain companies' know how - cannot be modified or accessed by CAD-systems, but may not be neglected in design processes using CAD-systems: Therefore, a real demand for convenient conversion methodes for engineering drawings can be stated. In this paper actual and new possibilities for the automated conversion of engineering drawings into CAD-models are discussed. After a global description of the conversion process, problems as well as existing and future solutions of processing substeps are explained in detail. The structure in principal and c omponents of conversion systems are described. The paper closes with an outlook on future trends and improvements using special hardware, parallel processing features and knowledge based methodes.

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