CAJ | 학술논문

薄膜型船载液化天然气储舱设计中的一个关键力学问题是对液体晃荡引起的冲击荷载的评估。晃荡冲击载荷主要包括晃荡冲击荷载的幅值，上升和持续时间以及荷载三角脉冲的偏斜度等参数。室内大比尺晃荡模型实验是评估晃荡冲击荷载的有效方法。以二维矩形液舱为模型，在大吨位六自由度运动平台开展了一系列不规则激励下的晃荡冲击荷载实验研究。研究结果表明：由于液体与气体的相互作用，导致晃荡冲击荷载具有幅值较大且冲击上升时间较短的特点，可能导致舱壁产生较大的响应。采用统计学的方法分析了晃荡冲击荷载的参数；此外，定量地提出了长期不规则激励下，由荷载峰值、上升和持续时间以及偏斜度的组成的三角脉冲荷载模型，该模型可为储舱舱壁结构设计和有限元分析提供荷载参考。
박막형선재액화천연기저창설계중적일개관건역학문제시대액체황탕인기적충격하재적평고。황탕충격재하주요포괄황탕충격하재적폭치，상승화지속시간이급하재삼각맥충적편사도등삼수。실내대비척황탕모형실험시평고황탕충격하재적유효방법。이이유구형액창위모형，재대둔위륙자유도운동평태개전료일계렬불규칙격려하적황탕충격하재실험연구。연구결과표명：유우액체여기체적상호작용，도치황탕충격하재구유폭치교대차충격상승시간교단적특점，가능도치창벽산생교대적향응。채용통계학적방법분석료황탕충격하재적삼수；차외，정량지제출료장기불규칙격려하，유하재봉치、상승화지속시간이급편사도적조성적삼각맥충하재모형，해모형가위저창창벽결구설계화유한원분석제공하재삼고。
Sloshing impact pressure is a key issue in the structural design of the membrane type Liquefied Nature Gas (LNG)carriers.The parameters of sloshing impact load includes its magnitude,rise time,duration and skewness. Experimental investigation on a large-scaled sloshing model is the most reliable approach to determine impact loads.A series of tests on a 2D rectangular tank subjected to irregular excitations were performed on a hexapod test rig.The experimental results show that due to the interaction between liquid and gas,the peak pressure exhibits large magnitude and short rise time,which might induce large structural dynamic response.The key parameters of sloshing impact load were analyzed by using a statistical method.An idealized triangular impact pressure was introduced as a quantitative long-term irregular excitation to provide a simplified model of the impact load which contains all the essectial parameters of magnitude,rise time,duration and skewness of the impact pressure.This gives a reference to the structural design of LNG tanks.