大开口深拖母船全船强度有限元分析

某深拖母船为实现作业功能，在船舯位置设有上下贯通的大开口结构，该结构特性会严重削弱目标船的总纵强度和弯扭强度，因此在针对该开口区域进行详细设计后，还有必要采用全船结构有限元分析方法来评估结构强度和变形水平。通过设计波法得到波浪载荷，计算全船在各种工况下结构的应力、变形结果，总结出该船型的受力特点，并结合全船结构强度直接计算结果，选取的典型节点进行疲劳强度评估，得到各个典型节点的疲劳寿命。计算结果对目标船的结构优化具有参考意义。

Finite Element Strength Analysis of Deep-towed System on Mother Ship with Large Open-hatch

In order to realize the operation function of a deep-towed system on mother ship, a large opening structure is designed through the midship, the features of structure will seriously weaken its longitudinal strength and bending-torsion strength. Therefore, after the detailed design of the opening area, it is necessary to carry out the global ship finite element analysis to evaluate its structure strength and deformation. the wave loads are obtained based on the design wave method, the stress and deformation of the global ship structure under various working conditions are calculated, and the feature of stress for this type of ships are summarized, Combined with the direct calculation results of the structure strength of the global ship, the fatigue strength of the selected typical hot spots are evaluated, and the fatigue life of each hot spot is obtained. The results of the analysis can be used for reference in the structure optimization of the target ship.