Simplification of feature-based 3D CAD assembly data of ship and offshore equipment using quantitative evaluation metrics |
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| Affiliation: | 1. Division of Ocean Systems Engineering, Korea Advanced Institute of Science and Technology, 373-1 Gusong-dong, Yuseong-gu, Daejeon 305-701, South Korea;2. Department of Mechanical Engineering, Dong-A University, 37, Nakdong-daero 550beon-gil, Saha-gu, Busan, 604-714, South Korea;3. Department of Precision Mechanical Engineering, Kyungpook National University, 386 Gajang-dong, Sangju, Gyeongsangbuk-do 742-711, South Korea;1. National University of Singapore, Singapore;2. The Chinese University of Hong Kong, Hong Kong;3. Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, PR China;1. School of Civil Engineering, Polytechnic University of Valencia, 46022 Valencia, Spain;2. School of Architecture, Polytechnic University of Valencia, 46022 Valencia, Spain;3. Polytechnic College at Lugo, University of Santiago de Compostela, 27002 Lugo, Spain;1. Université de Technologie de Compiègne, Laboratoire Roberval, Rue du Dr Schweitzer, CS 60319, 60203 Compiègne Cedex, France;2. Université de Technologie de Troyes, Institut Charles Delaunay - LASMIS, 12 rue Marie Curie, 10010 Troyes Cedex, France |
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| Abstract: | In the design process for ship outfitting and offshore plants, an equipment catalog database is compiled in order for shipyards to reutilize data effectively. However, the current procedure for building such a catalog causes wastage of time because the modelers in the shipyard must perform manual modeling of the 3D CAD data in order to decrease the size of 3D CAD data and adopt a different level of detail (LOD) depending on the purpose of its use. This problem arises because equipment suppliers are not willing to give all of their 3D CAD data to shipyards, out of fear of the loss of intellectual property. Moreover, the 3D CAD data of equipment suppliers have a high LOD, while a shipyard’s 3D CAD data have a relatively low LOD. Therefore, it is necessary to introduce an automated method to simplify the 3D CAD assembly data for equipment that is received from the equipment supplier. In addressing this problem, this study first proposes criteria for a simplification process and quantitative evaluation metrics for the simplification of 3D CAD assembly data, considering the characteristics of equipment data in the shipbuilding industry. Based on these findings, a simplification system was developed, and, four experimental test cases that were conducted on-site were used to verify the proposed system. The results showed that the data to be stored could be reduced to at least 25% of the original 3D CAD assembly data while ports, outer boundaries, and connectivity between CAD parts could be maintained. |
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| Keywords: | 3D CAD assembly data Simplification LOD Equipment catalog Evaluation metrics Ship and offshore plants |
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