【摘要】 基于S-N曲线和Miner线性累计损伤理论,采用谱分析方法对16万立方薄膜型LNG船典型节点的疲劳寿命进行了评估。建立全船结构有限元分析模型及典型装载工况下的水动力计算模型,给出不同浪向角及波浪频率下典型节点的热点应力传递函数及分布带宽系数,采用北大西洋波浪散布图,得到各典型节点的疲劳寿命结果,并对各节点的疲劳寿命进行评估和分析。分析结果可为同类LNG船的开发设计提供参考依据。更多还原

【Abstract】 Based on Miner′s rule of linear damage accumulation and S-N curves,the fatigue life of 160 000m3 LNGC is predicated by employing the spectral-based analysis.First,a finite element model of the ship structure was built.Then,the principal stress transfer functions of hot spots and the distribution coefficient of band width are calculated at different wave frequencies in several wave headings.The fatigue lives of the hot spots are evaluated and assessed using wave scatter diagrams for the North Atlantic as wave loading spectrum.The result can offer the reference for the similar LNG ship design and development.更多还原