【摘要】 海洋脐带缆通常由不同的功能构件捆绑而成，而这些功能构件的力学性能差异很大，在外载荷的作用下，不合理的截面布局可能会导致较大的截面变形和构件间的接触压力，从而影响脐带缆服役寿命。本文首先利用最小化截面半径给出截面布局紧凑性的实现方法，通过基于截面构件的拉伸刚度引入虚拟重力指标来描述截面布局的对称性，同时提出可量化的指标描述易损构件钢管之间的疲劳磨损问题。然后考虑上述三个目标建立截面布局多目标优化模型，并引入遗传算法对上述模型进行求解优化，自动得到三种具有代表性的截面优化布局。最后，通过数值模拟对不同截面优化布局进行验证与分析评价，进而得到最优截面布局设计。本文所提出的脐带缆截面布局设计优化方法可提高全局最优解搜索能力，对脐带缆结构设计具有一定的指导意义。更多还原

【Abstract】 A marine umbilical is usually bundled by different functional components, the mechanical properties of which are very different. Under the action of external load, unreasonable cross-sectional layouts may lead to large cross-sectional deformation and contact pressure between components, thus affecting the umbilical service life. Firstly, a method to realize the compactness of cross-section layout was given by minimizing the cross-section radius. The symmetry of cross-sectional layout was described by introducing virtual gravity index based on the tensile stiffness of components while a quantifiable index was proposed to describe the fatigue wear problem between vulnerable components like steel pipes. Then, the multi-objective optimization model of cross-section layout was established considering the above three objectives. The genetic algorithm was introduced to solve the optimization model and three representative cross-section layouts were automatically obtained. Finally, the numerical simulation was used to verify and evaluate the different cross-sectional layouts, and then the optimal cross-section layout design was obtained. The results show that the optimization method proposed in this paper can improve the ability of global optimization, which has certain guiding significance for the cross-sectional layout design of umbilicals.更多还原