大型升船机船厢门有限元优化设计

Finite element optimization design of the door in the large ship elevator

构建了某大型升船机弧形船厢门Ansys有限元模型,定义了16个参数化设计变量。采用最优梯度法,分析了各参数化设计变量对结构质量、最大VonMises应力、最大综合位移及结构第1阶固有频率的灵敏度,筛选了设计变量,评估了状态变量的变化趋势。以船厢门质量为优化目标,以船厢门结构应力、位移及结构第1阶固有频率为状态变量,采用子问题近似法进行有限元优化计算,得到了1组圆整的结构设计参数,满足结构刚度和强度要求,总质量降低22.19%,第1阶固有频率提高4.4%。

The paper establishes the Ansys finite element model for the arc door of a certain large ship elevator,and defines 16 parameterized design variables.The optimum gradient method is adopted to analyze each parameterized design variable＇s sensitivity to structural mass,maximum Von Mises stress,maximum comprehensive displacement and the stage I natural frequency of the structure,thus the design variables are determined,and the changing trend of the status variables are evaluated.With door quality as the optimizing target,the structural stress,displacement and the stage I natural frequency of the structure as the status variables,sub-problem approximation method is adopted to perform the finite element calculation,thus a whole set of the structural design parameters are obtained,which meet the structural rigidity and strength requirement.The total mass is reduced by 22.19%,and the stage I natural frequency is increased by 4.4%.