Analysis of the structural and hydrostatic characteristics of container ships in the context of their changes in longitudinal waves

This paper is devoted to the analysis of the structural and hydrostatic characteristics of container ships in the context of their changes in longitudinal waves. It is noted that the structural and hydrostatic characteristics of container ships have their own specifics, due, in particular, to the economic optimization of container transportation, and directly affect the behavior of the ship in waves. These specifics should be considered by navigators when calculating and monitoring stability during the voyage. It is emphasized that the hydrostatic characteristics of a ship in waves are constantly changing, and their consideration is a difficult task. Currently, no practical solution to this problem has been proposed. The passage of a wave along the hull of a ship assumes that different parts of it will have different draughts at different times. Based on this, this paper examines the variation and dependence of ship characteristics for different draughts. The waterline area and its completeness coefficients are considered as one of the most important parameters. To calculate them in waves, a technique is proposed, which consists in dividing the waterline into sections and determining the area of each section, taking into account its completeness coefficient, depending on the draught. Calculations performed using the characteristics of existing container ships of different tonnages have shown the dependencies and relations between such structural and hydrostatic characteristics of container ships as hull shape, relations between linear dimensions, draught, block coefficient and waterline area coefficient. It is noted that further research based on the results obtained in this work can form the basis for the development of a methodology for considering the parameters of a container ship in waves, suitable for use by navigators in practice. This will certainly contribute to improving the safety of operation of container ships.