波激振动对超大型集装箱船疲劳强度的影响研究  

Research on Effect of Springing on Fatigue Strength for Ultra Large Container Ship

作　　者：张志康 李丹丹[1] 林焰[2] 韩钰[1] 王伟飞 彭亚康 ZHANG Zhikang;LI Dandan;LIN Yan;HAN Yu;WANG Weifei;PENG Yakang(Marine Design & Research Institute of China,Shanghai,200011,China;Dalian University of Technology,Dalian 116024,China)

机构地区：[1]中国船舶及海洋工程设计研究院,上海200011 [2]大连理工大学船舶CAD工程中心,大连116024

出　　处：《中国造船》2019年第1期1-10,共10页Shipbuilding of China

基　　金：高技术船舶科研项目(工信部联装(2016)25号)

摘　　要：超大型集装箱船具有开口大、刚度低和航速快等特点,导致其波激振动现象突出,增加了疲劳破坏风险。论文以18, 000TEU箱船为研究对象,考虑对称与反对称模态的共同作用,采用有限元法进行干模态分析。基于三维线性频域水弹性理论,对其进行水弹性效应分析。然后采用谱分析法,通过直接计算求解热点应力响应,结合线性累积损伤法,求得疲劳损伤值和疲劳年限,并将其与刚体理论结果对比,分析波激振动对舱口角隅疲劳的影响。研究表明:当遭遇频率接近船体湿固有频率时,波激振动效应会引起船体载荷高频响应及应力高频响应,使得舱口角隅疲劳累计损伤度大幅增加,疲劳寿命普遍降低约30%～40%,部分节点甚至高达50%多。Due to characteristics of ultra large container ships such as large opening, low stiffness and high speed, springing effect becomes more serious and risk of fatigue failure increases. A modal analysis is done for a 18,000 TEU container ship by FE method with consideration of both symmetric modal and unsymmetrical modal. Based on 3D linear hydro-elastic method in frequency domain, elastic effect of wave load is analyzed. Spectral analysis method and linear cumulative damage method are adapted to calculate fatigue damage and fatigue life, in which the stress response at the hot spot is gained through direct calculation. Fatigue on the hatch corner with and without consideration of springing effect is calculated and compared each other. It is found that when the encounter frequency meets wet natural frequency of the hull, springing will lead to high-frequency response of wave loads and structure stress, which may generally increase fatigue damage by about 30%~40%, and even up to more than 50% for some details.

关 键 词：超大型集装箱船 波激振动 谱分析 疲劳强度 

分 类 号：U661.4[交通运输工程—船舶及航道工程]