菱形独立液舱晃荡载荷分析及强度评估研究  

Study on the Sloshing Load Analysis and Strength Assessment of Type A Independent Liquid Tank

作　　者：秦斌[1] 李小灵[1] 王冰[1] 

机构地区：[1]江南造船(集团)有限责任公司,上海201913

出　　处：《船舶与海洋工程》2015年第5期34-38,共5页Naval Architecture and Ocean Engineering

摘　　要：液化气船菱形独立液舱的设计要求为无装载高度限制,因此菱形独立液舱的结构设计必须重视最为危险的部分装载的工况,并考虑各种载荷。当船体在波浪中运动的频率与液舱内液体振动的固有频率相近时,舱内液体会发生剧烈的运动,此时液体晃荡对液舱结构产生的冲击载荷,在结构设计初期必须予以足够的考虑。以超大型液化气船的一个菱形独立液舱为研究对象,在对船舶固有运动周期和舱内液体的晃荡频率进行评估的基础上,运用二维有限差分法对不同液位高度下菱形独立液舱内部的晃荡载荷进行了研究和计算,获得了舱内液体的运动状态,速度及压力分布,并以此为基础,对菱形独立液舱的结构强度进行了评估,确保了全冷式液化气船菱形独立液舱结构设计的可靠性。Type A liquid tanks of liquefied gas carriers have no design restraint on loading height, so Type A structural design must consider the most dangerous partial loading conditions and takes into account various loads. When the ship motion frequency in waves is close to the natural frequency of liquid inside the tank, violent sloshing motion will occur to the liquid and cause impact load on the tank structure, which must be fully considered in the early design stage. Taking one of the Type A tanks of a super large liquefied gas carrier as the study object, and based on the evaluation of ship motion natural frequency and liquid sloshing frequency, the sloshing loads inside the Type A tank under different loading heights are studied and calculated using 2D finite difference method, to obtain the motion of liquid, the velocity and pressure distribution, and to perform the structural strength analysis, which ensures the structural design reliability of the Type A tank of the fully cooled liquefied gas carriers.

关 键 词：菱形独立液舱 晃荡 冲击载荷 结构 强度评估 

分 类 号：U661.43[交通运输工程—船舶及航道工程]