高速船在其营运期内某些区域容易出现疲劳损伤。目前，各船级社提出的疲劳强度简化计算方法是针对常规船型，不完全适用于高速船，因此有必要开展相关研究。本文将疲劳规范与适用于高速船的载荷计算相结合，采用有限元进行应力分析，计算载荷循环次数时考虑航速影响，再结合计算工况、超越概率水平、疲劳试验等因素开展高速船纵骨节点的疲劳分析。以实船为例进行计算，并从应力方面与规范值进行对比分析，从而提出一种合理的疲劳强度简化计算方法。结果显示，该方法是在原规范基础上针对高速船型进行的合理改进，目标船疲劳校核节点满足设计使用寿命要求。采用该疲劳简化计算方法对铝合金高速船结构设计具有实际参考意义。
Certain areas of high-speed crafts are prone to appear fatigue damage during their operational lifespan. The simplified calculation methods of the fatigue strength proposed by various classification societies are aimed at conventional vessel types and are not fully applicable to high-speed crafts. Therefore, it is necessary to conduct relevant research. This article combines fatigue rules and load calculation applying to high-speed crafts, using finite element analysis for stress calculation. When calculating the number of load cycles, the influence of the sailing speed is considered. Fatigue analysis of high-speed craft longitudinal frame nodes is conducted by integrating factors such as calculation conditions, exceedance probability levels and fatigue tests. Taking a specific real craft as an example, calculations were performed and compared with the normative values from a stress perspective, proposing a reasonable simplified fatigue strength calculation method. The results show that this method is a rational improvement over the original specifications tailored for high-speed craft types. The fatigue check nodes of the target craft meet the requirements for design service life. The adoption of this simplified fatigue calculation method is practically significant for the structural design of aluminum alloy high-speed crafts.
2024,46(24): 20-27 收稿日期：2024-4-22
DOI：10.3404/j.issn.1672-7649.2024.24.004
分类号：U661.43
作者简介：王伟(1991-),男,硕士,工程师,研究方向为船体结构设计
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