Automatic preparation of CAD-generated solid geometry for FE-meshing

• In recent years the computing power and meshing algorithms have developed to a state where FEA problems can often be solved directly using the solid geometry. However for complex geometry and complicated calculations there will for the foreseeable future be a need for geometrical idealizations.To reduce the time spent on making geometrical idealizations in repetitive FEA, a CAD-integrated KBES (Knowledge Based Engineering System) has been developed. The KBES creates a surface idealization from a thin-walled solid by utilizing generic modelling knowledge and by registering information about the CAD-specific features which the designer uses to define the solid geometry. From this information a corresponding surface idealization is created in the same CAD-system. This allows an updated and parametric geometry idealization of the complete CAD-geometry to be created with a degree of automation directly in the CAD-system.Primarily the mid-surfaces oriented in the tooling draft direction are created by evaluating the sketches which the features of the CAD-model are based on. The KBES also trims the created surfaces, thus facilitating the subsequent meshing.The KBES has been developed in CATIA V5 (Dassault systemes). It contains rules defined in CATIA knowledgeware which trigger sequential routines written in VBA (Visual Basic for Applications). An industrial application example where the system is used to automatically create a surface idealization for a die-cast part is also presented.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Tillförlitlighets- och kvalitetsteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Reliability and Maintenance (hsv//eng)

Nyckelord

TECHNOLOGY

TEKNIKVETENSKAP

Construction engineering

Konstruktionsteknik

Publikations- och innehållstyp

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