Erep An Editable High-Level Representation for Geometric Design and Analysis

We propose a high-level, generative, textual representation for featurebased solid modeling, which we call Erep. We argue that such a representation should be independent of an underlying core solid modeler, and give some criteria it should satisfy. Such an Erep allows archiving geometric designs in a form that is both editable and translatable to any solid modeling system. Furthermore, the representation serves as a global schema by which to federate different modeling systems, and is extensible in a natural way to a representation from which to derive analysis representations and process plans. By federating with finite-element analysis packages, in particular, our approach offers closing the design-analysis feedback loop that previously required a manual link. 'Supported in part by ONR Contract N00014-90-J-1599, NSF Grant CCR 86-19817, and NSF Grant ECD 88-03017. t While on leave in the Department of Computer Sciences, Purdue University. Partially supported by a NATO Scientific Programme fellowship and by a fellowship of the Spanish Ministerio de Ed ucaci6n y Ciencia

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