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Proceedings of CAD'15, 2015, 203-209
Explicit 3D Functional Dimensioning to Support Design Intent Representation and Robust Model Alteration

Ferruccio Mandorli, Harald E. Otto, Polytechnic University of Marche
Roberto Raffaeli, eCampus University

Abstract. Development of computer-aided design systems for mechanical engineering (MCAD systems) has mostly been oriented towards the feature-based modeling paradigm. This trend is reflected in the modeling functionality and data structures provided by the majority of current commercially available MCAD systems. The concept of form features, coupled with parametric functionality and feature history trees, has been the foundation for enhancing CAD systems. Based on that foundation, efforts in both academia and industry took decades to drive developments from pure geometric modeling systems, which were based on the instantiation of geometric primitives and Boolean operations, to integrated and more efficient design support systems. Within this context, features were meant to be the concept capable of capturing the design intent, while parametric functionality was supposed to provide a means for making model alteration and reuse easier. However, without knowledge relating to the original design intent and the initial use of features, feature history trees tend to become complex and ambiguous to the point of being incomprehensible.

Keywords. Functional Dimensioning, 3D Explicit Modeling, Design Intent, Technical Product Documentation Standard

DOI: 10.14733/cadconfP.2015.203-209