Studies on the Block Positioning Supporting System for Accuracy Management

概要

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Geometrical accuracy management activities are one of most the important production technologies in shipbuilding. The block positioning operation in the erection stage is a key process in such management. The quality of block positioning determines not only the final hull accuracy, but also productivity and the cost at the in-dock jobs. The new concept of computer aided accuracy management is proposed in this report. Accuracy management activities consist of 'accuracy planning activities' and 'accuracy measurement activities'. Accuracy measurement activities involve checking and coping with inaccuracy. For the accuracy measurement, two metrics are proposed: one is accuracy for completion (e.g. straightness, flatness) and other is accuracy for construction (e.g. relative joint shapes of each part). And detailed accuracy metrics for a block positioning operation in the erection stage is discussed in this report. The quality of block positioning operation is estimated by this metrics: accuracy for completion can be evaluated by the concept of the tolerance, and accuracy for construction can be evaluated by the concept of labor cost. The prototype system of accuracy metrics system is implemented. This metrics system is combined with commercial optimization software iSIGHT to decide the optimum block positioning. Then some examples of block position optimizing process are shown.
財団法人日本海事協会の論文