Comparison of Safety Levels Required by Adequate Regulations for Cargos Ships of Different Types (original) (raw)
During the currently ongoing development of methods for assessment of safety of ships it is imperative that a compromise between the accuracy of the results and the accessibility of obtaining results is reached. In this paper calculations of a theoretical hull against damage stability regulations as included in SOLAS 2020, ICLL 66/88 as amended in 2003 and MARPOL 78 are shown. The rules included in the currently valid regulations require certain righting arm curve properties from vessels before and after potential damage, which does not pose a high difficulty level to engineers. However, for many engineers, as well as scientists working with these rules, it is unclear to what kind of behaviour (particularly roll motion) these righting arm curve parameters correspond. In this paper a correlation between the required GZ properties and the actual roll motion of a ship in waves, as calculated with the well-established method proposed by the ITTC, is revealed and a comparison of the results to the currently in use regulations as well as comparison between the methods themselves is made. The comparison reveals impact of the GZ curve parameters on the roll motion of the ship.
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