Abstract
This paper describes the development of a novel automatic FEM mesh generation system based on the fuzzy knowledge processing technique. Here, a number of local-optimum nodal patterns for stress concentration fields are stored in a nodal pattern database. The closeness of each nodal location to the stress concentration field is expressed in terms of a membership function. In mesh generation process, several nodal patterns are first placed in an analysis domain, and extra-nodes are removed by the fuzzy knowledge processing technique. Then, either triangular or tetrahedron elements are generated in the two-or three-dimensional domain, respectively. The major advantages of the present method are summarized as follows: the ambiguity appeared in mesh generation processes is naturally taken into account, and by controlling a fewer input data, a user can generate a quasi global-optimum mesh for a whole analysis domain including several stress concentration fields. The system is developed with Smalltalk-80 on Macintosh II for the purpose of easy management as well as future extension. The performance of the present method is demonstrated through the mesh generation of several two-and three-dimensional domains.
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