Comparative analysis of different loading conditions on large container ships from the perspective of the stability requirement

Modern Technologies in Industrial Engineering 2015

Stanca, C.^1 ; Acomi, N.^1 ; Ancuta, C.^1 ; Georgescu, S.^1

Constanta Maritime University, Navigation Department, Mircea cel Btran Street, No. 104, Constanta

900663, Romania^1

关键词: Comparative analysis;    Compressive loads;    Double bottom structure;    Large container ships;    Panamax container ships;    Stability requirements;    Vertical bending moments;    Volumetric capacity;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/95/1/012072/pdf
DOI  :  10.1088/1757-899X/95/1/012072

来源: IOP

【 摘 要 】

Container ships carry cargoes that are considered light from the weight point of view, compared to their volumetric capacity. This fact makes the still water vertical bending moment to be in hogging condition. Thus, the double bottom structure is permanent subject to compressive load. With the enlargement of container ships to the Post Panamax vessels, the breadth to depth ratio tends to be increased comparative to those of Panamax container ships that present restriction related to maximum breadth of the ship.The current studies on new build models reveal the impossibility for Panamax container ships to comply with the minimum metacentric height value of stability without loading ballast water in the double bottom tanks. In contrast, the Post-Panamax container ships, as resulted from metacentric height calculation, have adequate stability even if the ballast water is not loaded in the double bottom tanks. This analysis was conducted considering two partially loaded port-container vessels. Given the minimization of ballast quantities, the frequency with which the still water vertical bending moment reaches close to the allowable value increases.This study aims to analyse the ships' behaviour in partially loaded conditions and carrying ballast water in the double bottom tanks. By calculating the metacentric height that influences the stability of the partially loaded port container vessels, this study will emphasize the critical level of loading condition which triggers the uptake of ballast water in the double bottom tanks, due to metacentric height variation..