考虑液货晃荡的液货船动力响应研究

发布时间：2018-04-09 12:26

本文选题：势流理论　切入点：液舱晃荡　出处：《浙江海洋大学》2016年硕士论文

【摘要】：海洋油气资源开采和运输量日益增加,且液货船具备运输效率高效而运输费用较低的优势,当前国际市场对液货船的需求也日益增长。液货船具有宽度较大、装载深度高的特性,在一定频率范围的波浪作用下,船体运动会导致剧烈的液舱晃荡,而晃荡载荷对船体结构和运动响应都将造成重大影响,进而影响液货船在运营中的效率和安全性。因此,在液货船设计阶段,有效预报液货船与液舱晃荡的耦合运动,开展考虑液货晃荡影响的结构强度评估,具有重要的应用价值。论文研究工作主要包括以下几部分。(1)基本原理与数值模拟方法研究。基于势流理论,将船壳外面以及液舱内表面统一生成湿表面,对液货船内外流场统一进行线性频域面元法计算,把晃荡载荷影响转化为运动方程中的附加质量项进行考虑。通过以荷兰MARINE实验室完成的FPSO实验为算例,数值模拟了不同浪向不同装载工况下液舱与船体耦合运动,验证本文的数值方法的计算精度和计算效率。(2)考虑晃荡影响液货船的水动力运动规律研究。针对11000DWT液货船,数值模拟了不同载液率、不同浪向角和不同纵舱壁形式下是否考虑液舱晃荡载荷的液货船运动。对比研究了有无晃荡载荷对液货船运动响应影响以及不同的装载率对液货船运动响应的影响。(3)考虑晃荡影响液货船的结构强度评估研究。对11000DWT液货船开展了波浪诱导载荷的长期预报,并采用设计波法研究了有无液货晃荡载荷的整船结构响应,研究了液舱晃荡载荷对液舱结构响应的影响规律。采用谱分析法对船中货舱典型节点进行疲劳损伤预报,研究了液舱晃荡载荷对液舱结构疲劳强度的影响规律。
[Abstract]:The exploitation and transportation of offshore oil and gas resources are increasing day by day, and the tanker has the advantages of high efficiency and low transportation cost, so the demand for tankers in the international market is increasing day by day.The tanker has the characteristics of large width and high loading depth. Under the action of waves in a certain frequency range, the ship sports will cause violent sloshing of the tank, and the sloshing load will have a significant impact on the structure and the response of the ship's motion.Furthermore, the efficiency and safety of tankers in operation are affected.Therefore, in the design stage of tankers, it is of great value to effectively forecast the coupling motion of tankers and tank sloshing and to carry out structural strength evaluation considering the influence of liquid cargo sloshing.The research work mainly includes the following parts: 1) basic principle and numerical simulation method.Based on the potential flow theory, the wet surface is uniformly generated from the outside of the ship's shell and the inner surface of the tank, and the uniform flow field inside and outside the tanker is calculated by the linear frequency-domain panel method, and the influence of the sloshing load is transformed into the additional mass term in the motion equation.The coupled motion of tank and hull under different wave directions and different loading conditions is numerically simulated by taking the FPSO experiment completed by MARINE Laboratory in the Netherlands as an example.The computational accuracy and efficiency of the numerical method in this paper are verified. (2) the hydrodynamic motion of tankers considering the influence of sloshing on the hydrodynamic motion is studied.For 11000DWT tankers, the motion of tankers with different liquid loading rates, different wave angles and different longitudinal bulkheads is numerically simulated.The effects of sloshing load on the dynamic response of tankers and the effects of different loading rates on the response of tankers are compared. 3) the structural strength evaluation of tankers considering the influence of sloshing on the structural strength of tankers is studied.The long-term prediction of wave-induced loads on 11000DWT tankers is carried out, and the structural response of the whole ship with or without liquid sloshing load is studied by design wave method, and the influence of tank sloshing loads on the structural responses of tanks is studied.In this paper, the fatigue damage prediction of typical nodes of cargo tank is carried out by spectrum analysis, and the influence of tank sloshing load on fatigue strength of tank structure is studied.
【学位授予单位】：浙江海洋大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U674.133

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