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Proceedings of CAD'17, 2017, 232-236
Graph Centrality Analysis of Feature Dependencies to Unveil Modelling Intents

Zhengrong Cheng, Yanan Xie, Yongsheng Ma, university of Alberta

Abstract. CAD model reuse boosts product development process. However, most of the CAD models are not well reusable. Even with the visually the same resulting CAD geometry, the modelling procedures and operations applied might be quite diverse. Without standard way of model construction, it is hard to modify CAD models to cater to new design requirements. In some cases, even a single alteration of certain value in the model could render the whole part unusable, which is even worse if it is not visually identifiable. The reason behind it, the authors believe, is that the non-optimal and implicit modelling strategy. In order to reach a more robust CAD modeling strategy, a better understanding of the nature of the CAD model construction is necessary. The authors believe the key lies in the understanding of modeling intents. Modeling intents are what behind the CAD model construction, i.e., what users wish the model to be. There are two levels of modelling intents, i.e., the reasons why models are constructed in certain ways to, firstly, conform to the physical structure, and secondly, comply with the functional design considerations. One of the generally-expected structural modeling intents is that minor (auxiliary) features should be built on top of major features that contribute to the general shape of the product.

Keywords. Modelling intents; Feature dependency graph; Network analysis; Feature-based design

DOI: 10.14733/cadconfP.2017.232-236