Geometric assessment for fabrication of large hull pieces in shipbuilding

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Geometric assessment for fabrication of large hull pieces in shipbuilding

Park, Jung-Seo / Shin, Jong-Gye / Ko, Kwang-Hee

In this paper we propose a geometric assessment method in order to establish a theoretical foundation for the automation of fabricating curved steel plates through the line-heating process in shipbuilding. We focus on measurement, comparison and the measurement data process in the overall system which was developed at Seoul National University, Korea, Shin et al. (Shin JG, Ryu CH, Lee JH, Kim WD. A user-friendly, advanced line-heating automation for accurate plate fabrication. Journal of Ship Production 2003;19(1):8-15). The measurement is performed using a scanning device, which provides the digitized geometric data of a curved plate. The measured data are then positioned against a design plate so that comparison between them is made to determine whether we have obtained the desired shape. If not, the data are approximated in B-spline surface form and the approximated surface and the measured data are processed to extract necessary information for computing heating lines for the next iteration. Experiments are performed with a real ship hull plate and the result shows the potential of the proposed procedure for the automation of the line-heating manufacturing process at the shipyard.