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Time-based Damaged Ship Survivability: A Quasi-static Equivalent Method

机译：基于时间的破损船舶生存能力：准静态等效方法

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This paper presents a series of ideas to make a step forward in the assessment of flooded ship survivability on a time-dependent basis. An extension of the SEM (Static Equivalent Method) to a Quasi-Static Equivalent method (QSEM) is proposed to take into account the time variable and to address the case of multiple compartments. A capsize index based, conceptually, on static calculations is defined as a function of time and sea state. Capsize is considered in terms of both a first-excursion problem concerning the wave amplitude, and as the persistence of high-runs of waves above a critical level. An example of the proposed methodology is presented for the analysis of the flooding a two decks. Using the same hydraulic model, comparisons are carried out between the presented approximate analytical methodology and direct numerical simulations of the flooding process to assess the effect of downflooding means. A discussion is given on how the time-based approach to ship survivability links with the evacuation process, in order to obtain the probability density function of the number of evacuated passengers.
机译：本文提出了一系列思路，以便在依赖时间的基础上进一步评估淹没船舶的生存能力。建议将SEM（静态等效方法）扩展为准静态等效方法（QSEM），以考虑时间变量并解决多个隔室的情况。从概念上讲，基于静态计算的倾覆指数被定义为时间和海况的函数。考虑到与波幅有关的一阶偏移问题以及在临界水平以上的高阶波的持续性，均考虑了容量上限。给出了所提出方法的一个示例，用于分析两个甲板的洪水。使用相同的水力模型，在所提出的近似分析方法和注水过程的直接数值模拟之间进行了比较，以评估下注方法的效果。讨论了基于时间的船舶生存能力方法与疏散过程的关系，以便获得疏散乘客人数的概率密度函数。

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