After the hull variation, the ship''s compartment design is carried out to create necessary spaces such as cargo tanks, ballast tanks, and fuel tanks, taking into account the shipowner''s requirements, regulations, and types of cargo, and to calculate whether the volumes of the compartments are similar to those estimated through the performance line. Subsequently, it is calculated whether the regulations related to the partition design are satisfied. Depending on the conditions of each ship''s operation, the ship''s posture and external force are calculated according to the amount of displacement under the draft line, the volume of the compartment, the cargo loading, etc. to check whether the restoration performance is satisfied in case of intact and damage stability according to the ship regulations. If each condition is not met in the design process, design changes are made to the hull or to the compartment model, and the process of performing the ship calculation is repeated to produce a final result when all requirements are met.
Current parcel design requires an understanding of ship regulations based on the company''s internal baseline and a deep understanding of the high difficulty and 3D space of the script-based existing parcel design program, so the designer''s experience is very important. In the case of unskilled people, it takes a lot of time to put into work and perform practical tasks. In addition, the number of design personnel at shipyards is gradually decreasing, and the opportunity for unskilled people to learn compartment design from skilled designers is gradually decreasing.
In the case of NAPA, an existing ship compartment design program mainly used in shipyards, surface-based compartment modeling is conducted, but in actual calculation, the cross-sectional area is calculated by integrating wire frames densely cut in the longitudinal direction using Simpson''s Rule, and then calculating the cross-sectional area value again in the same way. Therefore, errors occur in the corresponding process.
In this study, a three-dimensional solid-based optimal compartment design system was developed to solve this problem. First, we developed a three-dimensional solid-based spatial modeling function and an arithmetic function for spatial modeling. Using the Boolean operation, complex ship compartments can be defined. Second, the functions of calculating hydrostatics, calculating tank capacity, and calculating the equilibrium posture of the ship, which correspond to the basic calculation of the ship, were developed. Third, in consideration of the characteristics of each ship type, the design problem of the tanker''s cargo warehouse compartment was formalized, and this was formalized as an optimization problem. A program with a visualization and analysis GUI was developed using the developed function. After that, the error of the functions was confirmed by comparing with the existing program, and the optimization problem was applied to Suezmax Tanker.