A graph transformation based method for the semi-automatic generation of parametric models of shield tunnels

During the design of large infrastructural projects like inner-city subway tracks, it proves necessary to consider differing model scales, ranging from kilometers to centimeters. This problem 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 parametric modeling techniques while creating the model. However, the correct application of constraints and dependencies has shown to be too complex to be handled manually. To address this issue, this papers presents an automated detailing mechanism, which is based on the use of graphs and graph transformations. We show how procedural parametric models based on two-dimensional sketches can be represented by graphs and how refinement steps can be realized through the rule-based transformation of such a graph.