By Hans Grabowski, Reiner Anderl, Michael J. Pratt
Reiner Anderl The complicated Modelling a part of the CAD*I venture geared toward the improvement of a brand new new release of modelling options as a simple performance of destiny CAD/CAM structures. The method and ideas for complex modelling ideas, their availability within the communique interface of a CAD/CAM approach and their impact on inner interfaces within the software program structure of a CAD/CAM method are basic result of complex modelling paintings. those effects shape the foundation for the advance of a brand new iteration of CAD/CAM platforms that are known as product modelling structures. CAD/CAM structures this present day quite often aid the geometric description of a technical half or its description as a technical drawing. complex geometric modelling features care for parametric layout services embedded into CAD/CAM platforms. even though, improvement thoughts for destiny CAD/CAM platforms are directed towards the next: 1. the improvement of product modelling structures and a pair of. the improvement of built-in structures in keeping with CAD, CAP (Computer Aided Planning), CAM and different CIM (Computer built-in Manu facturing) functionalities.
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A second approach is based on on-line processing of geometric constraints and interactive updating of the current shape definition. 3-2 shows an interaction sequence of a design process. The process evaluates the design at every step, recognizes overdetermined cases and allows any constraint to be modified during the design process. The approach described by Aldefeld /ALD-88/ is also based on an expert system. 3-3). The computing process is subdivided in two phases: 4. 3-2: 50 Add constraining distance value of 2S --I Example of the Interactive Definition of Geometric Constraints / BJO-87 / • preprocessing of the design and building a symbolic description • computation of the numeric values of the design.
5. 2 59 The D'lT·Modeller (Design by Technical Terms) The DTT-Modeller has been developed as a prototype modeller to illustrate research results. DTT stands for Design by Technical Terms and represents a system which is able to demonstrate the principles of technical and especially technical-associative modelling. e. ). Technical-associative modelling is defined as the modelling of relationships between these engineering elements. These relationships often allow the parameter or attributes to be determined of engineering elements.
Assoc. Entities GA-List 12 13 by Modified Model constraints A232 fail ..... 01 ... 3-9 11 model modification .. e. Assoc. ---. 3-10 . n Modified Model A232 Model Modification by Constraints 5. 1 State of the Art Since the CAD*I project started in 1984 a number of systems have become available which realize some aspects of the modelling concepts, described in Chapter 3. 1-1. 1-1: Advanced Modelling: List of Implementations Obviously, it cannot be guaranteed, that the list is complete. The first point is that only 3D-systems have been considered as possible members of the list.