Abstract
For the design of large infrastructure projects such as inner-city subway tracks, it proves necessary to consider differing model scales, ranging from the scale of several kilometers down to a few millimeters. This challenge can be addressed by using multi-scale product models comprising multiple levels of detail (LoD). Ensuring consistency across the different LoDs can be achieved by applying procedural and parametric modeling techniques while creating the model. This results in a flexible multi-scale model that can be easily modified on one scale while other scales are automatically updated. However, the correct application of parametric constraints and procedural dependencies has shown to be a very complex and time-consuming process. To address this issue, this papers presents a semi-automated detailing mechanism, which is based on formal procedures based on graphs and graph transformations. This paper discusses how procedural parametric models based on two-dimensional sketches can be represented by graphs and how detailing steps in the form of parametric modeling operations can be formalized by using rule-based graph rewriting.
Highlights
The ongoing digitization of planning processes in the building sector has become a major improvement for the AEC industry and is being expanded into the infrastructure domain [10]
The approach presented in this paper as well as most of the methods listed above use the advantages of graph based representations and graph rewriting, but these methods aim at assisting a designer by generating sets of possible design variants, from which he can choose
The presented research introduces a concept for the graphbased representation of product models and their automatic detailing by performing graph rewrite operations based on formal rules defined in a graph rewriting system
Summary
The ongoing digitization of planning processes in the building sector has become a major improvement for the AEC industry and is being expanded into the infrastructure domain [10]. One conclusion of this research is that the manual definition of the required parametric dependencies is a very complex, time-consuming and errorprone task, which could strongly benefit from automation mechanisms [6] To address this challenge, this paper presents an approach to realize these automation mechanisms. We see the proposed approach as a contribution to the fields of knowledge-based engineering [43,31,1] and knowledge-driven design synthesis [35,26,46] This proposed methodology is demonstrated by applying it to the modeling process of a shield tunnel. Based on the general introduction of a graph rewriting system designed to represent and manipulate elementary parametric and procedural modeling operations as well as the corresponding geometric objects, a set of exemplary rules describing the detailing process of the tunnel model is presented as proof of concept. The paper ends with a conclusion discussing the development of our research, the major findings including known limitations and its possible generalization as well as topics for future research
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