Сargo carrying capacity calculation for combined ships in optimization problem for ship’s main elements

This article is devoted to the development of the cargo carrying capacity evaluation method for a combined ship of tanker/platform type. A specific feature of cargo carrying capacity calculation for such ships lies in the fact that they have two cargo compartments of different structure. The compartments are interconnected, including dimensions, and influence each other. This fact leads to the need to update the existing calculation methods when justifying the main dimensions both of tankers and of platform ships. It is proposed to include the parameters which affect the cargo carrying capacity and take into account the above mentioned influence into the cargo carrying capacity equations. This article also specifies the determination methods for these parameters in the early stages of ship designing. All this made it possible to obtain relations, the inclusion of which into the mathematic model of optimization problem for main elements of a combined ship (tanker/platform type) allows proper evaluation of all available options of main dimensions in terms of their compliance with carrying capacity for each specific cargo as well as exclusion of improper options from consideration.