A Product Modeling, System that Supports the Maintenance of Large-Scale Manufacturing Facilities

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This research project aims to develop an as-built modeling system, which provides 3D models of large manufacturing facilities, such as ships, manufacturing plants, maritime structure, and chemical plants.Such facilities are measured using laser scanners and acquired large amount of point data are process ed and converted to 3D models. We developed the following techniques:(1) Streaming points-processors, which enable to manage huge point -clouds in the limited memory;(2) Robust surface estimators, which generate smooth mesh models from very noisy point data;(3) Segmentation techniques for extracting parts;(4) Surface fitting tools for calculating equations; and(5) A unified modeling platform, which can manages point-clouds, mesh models, and solid models.In addition, we developed mesh deformation tools for modifying 3D models acquired from the current facility and evaluating facilities to be updated. This technique enables to interactively deform existing3D models in trial-and-error while preserving engineering constraints.