船体建造における複数船台の効果

概要

論文の詳細を見る
Various controlling methods are being developed recently for the improvement of hull construction in the modern shipbuilding. However, the purpose of this study and development is concentrated in the levelling of the irregularity in application of the labor distribution in the course of construction of various types of ships in which each distinctive characteristics of particular working process are involved.The author adheres to the principle that the single berth construction method in the shipbuilding is not complete as if running of a wagon with one lop-sided wheel. In otherwords, the construction method by means of two or more berths of the same size is the ideal organization of a shipyard, and is preferable with higher manning efficiency in comparison with a single berth yard.Suppose we take the period on the berth indicated by M-days, and the manpower for shopworks, assembly and on-berth per ship at a certain day t after the commencing of the work indicated by f(t) men then, the total required manpower in combination with manpower required for a ship before and after the single berth F_1(t) men are given by F_1(t)=Σ^^∞--κ=-∞f(t+κM) in which F_1(t) is designated by the periodic function of period M.In spite of the fact that the required manpower can be shown by the periodic functions, the present situation at each shipyard is obliged to keep constantly the maximum or nearly equivalent manpower. The loss of manpower taking places in accordance with wave-like up and down of the periodic function gives an essential influence to the productivity. The author confirms there is a big difference in the occurrence of the manpower loss in connection with the periodic curve of F_1(t) and that the manpower loss in multi-berth always decreases from that of the single berth case. Furthermore, the auther makes it clear that developing the function into FOURIER series, the extent of such decrease gets smaller rapidly with the increase in the number of the berths such as 2,3,4,…Thus the auther authenticates the advantages in multi-berth, especially two berths.Moreover, in order to confirm this theory, by showing the abovementioned f(t) turning into simplified chart example, and by means of obtaining actual examples from outstanding shipyards in Japan, the author compares the manpower loss and shows definitely the advantages in multiberth quantitatively.
社団法人日本船舶海洋工学会の論文

船体建造における複数船台の効果

スポンサーリンク

概要

著者

関連論文

スポンサーリンク