基于Kriging代理模型的加筋柱壳结构优化

Optimization Design of Stiffened Cylindrical Shell Structures Based on Kriging Model

基于Kriging代理模型,研究了加筋柱壳型飞行器舱体结构形状和尺寸优化方法。对加筋柱壳结构建立了三维参数化模型,参数化设计变量包括纵向加强筋数量、尺寸和环向加强筋的位置、尺寸,利用试验设计法选取设计变量采样点,使用有限元静力分析和线性屈曲分析得到采样点的应力、变形、屈曲强度因子等响应值,依据设计变量和响应建立Kriging代理模型,使用优化算法对代理模型进行寻优,获得最优设计结果。整个优化过程在Workbench平台中实现,最优结构比初始模型重量减少了11.91%。加筋柱壳结构优化结果分析表明,所使用优化方法优化效果明显、工作流程清晰、优化效率高,具有较大的工程应用价值。

The shape and size optimization method for Stiffened Cylinder Shell Structures of vehicle cabin based on Kriging surrogate model was investigated. A three-dimensional parameterized modal of Stiffened Cylindrical Shell Structures was established. The parameterized design variables include the number and size of longitudinal stiffeners and the location and size of circumferential Stiffeners. The sampling of design variables were selected by experimental design method, and the finite element method which include static analysis and buckling analysis was used to obtain the response values of stress, deformation and buckling intensity factor at the sampling point. The Kriging surrogate model was established based on the data. The genetic algorithm was used to optimize the Kriging surrogate model to obtain the optimal solution. The whole optimization process was realized with ANSYS/Workbench software, and the result shows that the weight of the structures was reduced by 11.91% compared with the initial modal. The results of optimization focused on Stiffened Cylinder Shell Structures show that the optimization has obvious effect, clear workflow and high optimization efficiency, and the optimization method has great engineering application value.