Characteristics of dynamic response of Mark III LNG containment subjected to idealized triangular sloshing impact

초록

Dynamic response of LNG cargo containment subjected to sloshing impact is very complex because of high variability of sloshing load and insulation materials. During the structural strength assessment of the cargo containment in response to the sloshing impact, it requires careful investigations to the structural behavior of the containment. In this study, dynamic characteristics of Mark III type containment subjected to the sloshing impact are investigated with the variation of parameters in the pattern of sloshing load that are assumed from the pressure history. Characteristics of dynamic structural responses to various sloshing impacts are investigated in detail based on the results of implicit-transient finite element analysis. The dynamic behavior of containment are analyzed for the variation of duration time and skewness, and the peak pressure which represents the sloshing load assumed from the model test or computational fluid dynamic analysis. An important observation is that although the maximum pressure and the impulse are similar, the dynamic response of the containment shows significant variations if the duration time and rising time is different. Copyright © 2011 by the International Society of Offshore and Polar Engineers (ISOPE).