Requirements of intelligent CAD systems are aimed to enable them to support the designer throughout his/her entire activity, starting from conceptual design and ending with, according to given specifications, an almost complete design object description.

Current approaches featuring geometrical constraint-based systems with parametric or variational models, allow the designer to consider the realized design object description as an archetype of a family, based on a unique morphological model with unambiguous sets of parameterized rules. However, functionality for both design and reasoning, are limited to the low geometric level, leaving most of related information from the design intend and related technology unconsidered.

Our objective of given study is, to extend the present functionality of existing approaches by integrating different types of knowledge and incorporate dedicated semantics in form features and feature-based methodologies. As a basic representation, typed attributed entity structures (TAE) are used. Computation is performed over domain structured alphabets of attributed symbols using a conditional attributed rewriting system.

An application example in form of a wing rib, taken from aerospace engineering, is used, to verify and demonstrate the modeling and consistent handling of knowledge formations within our developed framework. Current limits of our new approach are discussed and a comparison related to the functionality of existing systems is undertaken, to direct the focus on further enhancements and extensions of our approach.

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