Development of the ship hull assembly sub-process
Objective: The development of the ship hull assembly process is possible by changing the method of assembly of basic parts at the building site, which would shorten the duration of the process and lead to cost reduction. One of the possibilities is to increase the dimensions and mass of basic building units, as well as the crane capacity at the building site.
Methods: Ship hull assembly methods involving sections, blocks and modules are used in the hull assembly phase. In the world’s best shipyards, ships are built from blocks or modules, in which as much equipment as possible is installed. This paper uses the finite element method (FEM) for structural analysis, and its results serve to define the optimal technological instructions for the vertical transport of ship hull structure blocks.
Results: The development of the ship hull assembly sub-process can be achieved by using the hull block assembly method instead of the hull section assembly method. For the ship presented in this paper, the mass of a block transported to the building site was increased 3 times, so the number of building units was reduced by 65%. This reduces transport activities on the building site and shortens the duration of the assembly process by 20%. This paper shows that strengthening the block structure with temporary stiffeners is necessary for safe transport. It is possible to optimize their number and layout by using structural analysis.
Conclusion: The development of numerical finite element methods, software packages, and computers allow wider use of structural analysis in solving engineering problems in shipbuilding technology. The simulation of realistic situations, a wide range of analyses and a large number of results become possible, and they raise the level of knowledge and enable better decision-making in the production process.
Copyright (c) 2022 Stipe Antunović, Boris Ljubenkov, Karmela Prlac
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