晃荡载荷作用下液化天然气船泵塔结构疲劳寿命分析方法  

Fatigue Life Analysis Methods for Pump Tower of Liquefied Natural Gas Carrier under Sloshing Load

作　　者：张爱青[1] 薛鸿祥[1] 唐文勇[1] 

机构地区：[1]上海交通大学海洋工程国家重点实验室,上海200240

出　　处：《上海交通大学学报》2012年第3期363-367,共5页Journal of Shanghai Jiaotong University

基　　金：海洋工程国家重点实验室自主研究课题(GKZD010041)资助

摘　　要：针对液化天然气船运动而产生舱内晃荡载荷,研究了泵塔结构的疲劳分析方法和规律性.船体耐波性能采用动态载荷方法求得,并按ABS规范选取对晃荡载荷最不利的船舶运动参数;应用二维晃荡程序计算流体晃荡所产生的速度与加速度,并基于Morison公式计算晃荡载荷;采用线性累计损伤理论的S-N曲线法对泵塔管节点的疲劳寿命进行分析,获得了疲劳损伤随装载率的变化规律.This paper mainly researched on the pump tower structure fatigue life under sloshing loads in liquefied natural gas carrier.The motion of the hull is calculated using the dynamic load method.Based on the seakeeping results,the critical sloshing movement of the ship is selected according to ABS rules.The sloshing load is obtained using Morison formula based on the results of velocity and acceleration calculated by 2D sloshing program.Fatigue life of the pump tower is predicted using cumulative fatigue damage theory and the relation of fatigue damage degree to loading level is concluded.

关 键 词：液化天然气船 泵塔 晃荡载荷 疲劳寿命 

分 类 号：U663[交通运输工程—船舶及航道工程]