Advanced Modelling for CAD/CAM Systems by Hans Grabowski, Reiner Anderl, Michael J. Pratt

By Hans Grabowski, Reiner Anderl, Michael J. Pratt

Reiner Anderl The complicated Modelling a part of the CAD*I undertaking aimed toward the improvement of a brand new new release of modelling ideas as a uncomplicated performance of destiny CAD/CAM platforms. The technique and ideas for complex modelling ideas, their availability within the conversation interface of a CAD/CAM process and their impression on inner interfaces within the software program structure of a CAD/CAM approach are basic result of complex modelling paintings. those effects shape the root for the improvement of a brand new iteration of CAD/CAM platforms that are referred to as product modelling platforms. CAD/CAM structures at the present time more often than not help the geometric description of a technical half or its description as a technical drawing. complicated geometric modelling functions care for parametric layout features embedded into CAD/CAM structures. although, improvement concepts for destiny CAD/CAM platforms are directed towards the next: 1. the improvement of product modelling structures and a pair of. the advance of built-in platforms in accordance with CAD, CAP (Computer Aided Planning), CAM and different CIM (Computer built-in Manu­ facturing) functionalities.

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Any user input has additional semantics depending on the current state of model. It must therefore be interpreted in connection with this semantic context_ 4. Geometric-Associative Modelling 39 3. g. geometric entities or symbols) that are recognized should be stored in the model so as to be available for further analysis. 3-1). The individual modules of the HIS perform the tasks described in the following chapters. ~ L-~ ;' ~ ... ~ ·: C-~ :: ' + J: GeometrIc EntIty TechnIcal Symbol Command Symbol --.

1 SulUect ofSpeci1ica1ion The goal of an advanced CAD-system is to provide a tool box of automated problem solving aids that allows a designer to conceive, evolve and document his design ideas. Above, it has been described a multi-level advanced modelling system. Because of the important role of geometric information in design, a requirement for an intelligent CAD-system is to store in an explicit form geometric knowledge in a model. In the following a paradigm for an advanced CAD-system is discussed based on the geometric-associative modelling approach.

The user has to prepare a list of alphanumerical commands which describe the model. This description is then used to generate a program which may require some further user input in order to compute the model of an object. Therefore, language oriented approaches require an a priori abstract definition of a model. The main advantages of this approach are that the language supports highlevel constructs and therefore the efficient description of repetition and standard parts. 2-2 shows as how this definition is used as part of a pattern.

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