大型LNG船液舱晃荡结构动响应研究

摘要

Tank sloshing study of large liquefied natural gas ( LNG) carriers is very important when ship size and working state change vastly. Firstly, characteristic of the NO96 type containment system of large LNG carriers is studied. Then, dynamic responses of containment system under sloshing impact loads with different pressure peak and duration times are studied using explicit method and dynamic failure characteristics at different situation are studied. Finally, critical pressure load formulae are derived based on the proportional limit and the abruptly increasing permanent deflection, suggestions for design criteria and safety evaluation are also given.%在船舶尺度和营运状态与传统条件发生很大变化的情况下,大型液化天然气(LNG)船液舱晃荡研究显得尤为重要.本文分析了NO96型LNG船液舱围护结构的特点,采用显示积分方法研究不同晃荡压力峰值和持续时间的晃荡冲击载荷作用下液舱围护系统结构动响应,得到不同工况下结构的动态失效特性.最后回归基于比例极限和突变永久变形的临界压力载荷公式,并给出液舱围护系统结构设计准则和安全性评估方法建议.