Analysis of hydrostatic characteristics and justification of the select superfull hull form of the subsea construction vessels

Abstract

Within the research the analysis of hydrostatic characteristics such as volumetric and weight displacement, buoyancy center abscissa, buoyancy center appliqué, waterline area, waterline area center of gravity abscissa, waterline area transverse moment of inertia, waterline area longitudinal moment of inertia, transverse metacentric radius, block coefficient, waterline area coefficient, midshipsection coefficient, and justification of the choice of a superfull hull form of the subsea construction vessel was made. At the same time, the system analysis and mathematical model of justification of the select of a superfull shell was developed considering influence on the main dimension of the vessel of load-lifting devices, a diving complex, a mobile drilling complex, a pipelaying complex, the cablelaying equipment and hydrostatic characteristics. The block diagram reflecting an algorithm of a research and justification of a superfull shell is made. The mathematical model describing researches of justification of a superfull shell of the subsea construction vessels is made. Dependences of hydrostatic characteristics of the studied shell of the subsea construction vessel were developed for justification of the select of a shell of a superfull form and comparison with a superfull shell is executed. At the same time, a systematic analysis and mathematical model were developed to justify the choice of ansuperfull hull form, taking into account the impact on the main dimensions of the vessel of lifting devices, diving complex, mobile drilling complex, pipe- laying complex, cable-laying equipment, and hydrostatic characteristics. A structural diagram was drawn up reflecting the algorithm for researching and justifying the super- full hull form. A mathematical model was developed describing the research to justify the superfull hull form of a vessel for underwater construction work. The dependencies of the hydrostatic characteristics of the vessel's hull were developed to justify the contours of the superfull hull form. Analysis of the hydrostatic characteristics of the studied superfull hulls allowed us to make an informed choice of hull shape for a vessel for underwater construction work. A calculation method was developed, the main characteristics were determined, and preliminary estimates of the required power of the main engines of a vessel with a superfull hull for underwater construction work were made. To confirm the reliability of the calculation model, a comparative diagram of calculations was developed using the CFD model of an existing vessel with an overfilled hull shape that is in operation, and a calculation of the superfull hull shape of a vessel for underwater construction work. As a result of the study, the superfull hull shape of the vessel for underwater construction work was confirmed.