地质调查船月池结构局部强度评估及优化

Research on strength assessment and optimization of moon pool structure of a geological research ship

采用直接计算法对地质调查船的月池结构强度进行评估。对调查船全船建立有限元模型,并对月池结构进行细化;考虑月池区域局部载荷最大的工况,利用频域内的三维势流理论和设计波法计算地质调查船在各工况下的波浪载荷,同时考虑各工况下月池结构处井架支脚的支反力,进而计算月池结构在不同工况下的应力响应。参考散货船结构强度直接计算分析指南对月池结构强度进行评估,对不满足许用应力标准的结构给出了优化方案并进行了进一步的校核。结果表明,三维势流理论和设计波法为带有月池结构的船舶波浪载荷的计算提供了有效的技术手段,采用直接计算法所得到的评估结果可为该类船舶的设计开发提供参考。

The strength assessment of a moon pool of a geological research ship was carried out based on direct calcula-tion. First, a three-dimensional finite element model was constructed and the moon pool structure was detailed. The wave loads were computed using linear 3D hydrodynamics associated with the design wave approach and working load was also taken into account in each load condition. Then the stress responses of the moon pool structures under different load cases were calculated. Finally, the strength of the moon pool structure was assessed in accordance with the relevant rules and sug-gestions were given for improving structural members where stresses exceeded the permissible stress criterion. It can be con-cluded that the wave load computed using the design wave approach is reasonable and direct calculation is an effective tech-nical method for strength assessment of ships with moon pool structure.