基于一个二维水弹塑性方法和极限强度评估的集装箱船结构优化研究

海上极端波过去常常导致船舶结构的极限破坏,而船舶的极限崩溃涉及到船体结构的动态极限强度和结构非线性.该文通过二维的水弹塑性方法研究了集装箱船在极端波中的非线性动态强度,该方法考虑了船体的极限强度以及船体结构的非线性和波浪之间的耦合.并通过该二维水弹塑性方法和极限评估方法研究了船体结构的结构优化.文中还通过二次规划法(SQP)来优化基于非线性的动态强度的集装箱船体结构.最少的结构成本是本优化的目标函数,约束条件保证船体的强度要小于结构的极限强度,并且结构设计尺寸要满足规范的要求.随着设计波高的变化,这些优化的设计变量的变化趋势得以发现,一些研究的结论可用于船舶规范的参考.

Structural Optimization of Containership Based on a 2D Hydroelasto-plasticity Method and Ultimate Strength Evaluation

Generally, extreme waves used to lead to ultimate collapse of ship structure, actural ulti-mate collapse involves the dynamic ultimate strength and structural nonlinearity of ship. In this pa-per, a 2D hydroelasto-plasticity method is used as a means of studying the nonlinear dynamic strength of a containership in extreme waves, while considering the ultimate strength of the ship. The hydroelasto-plasticity is able to consider the coupling of ship structural nonlinearity and waves. The structural optimization of a containership is studied by using the 2D hydroelasto-plasticity method to carry out ultimate strength evaluation. Sequential quadratic programming (SQP) method is used to optimize the structural members of the containership based on nonlinear dynamic ultimate strength. The least structural cost is objective function, constraint condition is that structural strength is thought to be smaller than ultimate strength, and the structural size of each structural members should be satisfy with the CSR. As the extreme wave height is changed, the tendency of optimal design vari-ables is discovered. Several studying conclusions can be referred by rules of ship classification.