LNG动力船燃料罐疲劳强度分析  

Analysis of Fatigue Strength for the Fuel Tank of LNG-Fuelled Ships

作　　者：赵伟[1] 金全洲[2] ZHAO Wei;JIN Quanzhou(Jiangsu Branch,China Classification Society,Nanjing 210011,China;Wuhan Standard Research Institute,China Classification Society,Wuhan 430022,China)

机构地区：[1]中国船级社江苏分社,南京210011 [2]中国船级社武汉规范研究所,武汉430022

出　　处：《船舶工程》2024年第3期38-41,72,共5页Ship Engineering

摘　　要：为全面有效地执行国际海事组织发布的《使用气体或其他低闪点燃料船舶国际安全规则》(IGF规则),采用两参数Weibull分布表示应力范围的长期分布,基于IGF规则中液化天然气(LNG)等液化气体对B型燃料舱疲劳设计条件的相关要求,结合国际船级社协会和中国船级社相关规范及指南对疲劳评估规范的要求,推导出累积损伤计算的简化公式。算例表明,简化的计算方法能方便、有效地计算不同设计使用寿命(对应于总的波浪遭遇次数)和对应概率水平载荷下的液化气体B型燃料舱累积损伤度。在IGF规则要求框架下,所提算法可直接满足IGF规则要求的累积损伤计算要求。For the full and effective implementation of the International code of safety for gas-fuelled ships(IGF code),study of fatigue strength for the tank of LNG-fuelled ships is carried out by using a two-parameter Weibull distribution to represent the long-term distribution of stress range.Based on IGF code,and in combination with the requirements of IACS and CCS related guidelines,a simplified formula for the calculation of the cumulative damage is derived.The numerical examples show that the cumulative fatigue damage under different design life(corresponding to the total number of wave encounters)and stress range of certain probability level can be calculated by the proposed method effectively and conveniently.Under the framework of IGF code,the proposed algorithm can directly meet the cumulative damage calculation requirements of IGF code.

关 键 词：液化天然气燃料船 燃料舱 IGF规则 疲劳评估 

分 类 号：U661.43[交通运输工程—船舶及航道工程]