Enabling Round-Trip Engineering Between P&I Diagrams and Augmented Reality Work Instructions in Maintenance Processes Utilizing Graph-Based Modelling

Round-trip engineering usually describes the synchronization between formalized documents and realizations in software engineering. Piping and Instrumentation Diagrams are commonly used in process engineering and play a major role in planning and documentation of maintenance processes. The authors propose a method for the synchronization of engineering data via a dynamic graph-based model, which offers context-sensitive work instructions utilizing smart devices and feedback from maintenance processes back into the engineering documents, thus facilitating manual consolidation afterwards. This paper elaborates the concept of graph-based modeling for hydraulic systems, the transfer of P&I Diagrams into the proposed model, utilization of the model for Augmented Reality support in maintenance processes and the feedback for added assistance in keeping engineering documents up-to-date. The authors implemented and validated the concept under laboratory conditions.