【摘要】 通过集成有限元分析软件和优化程序,建立了静动态协同优化的多学科优化设计模型.在静力学学科级优化中以静水压力作用下结构质量最小为目标函数;在动力学学科级优化中以水下爆炸冲击波载荷作用下结构的最大变形值最小为目标函数.在系统级优化中以协调优化目标值和独立优化目标值之间差异最小为目标函数.采用由多岛遗传算法构成的二级优化策略,最后对加筋圆柱壳结构进行了优化设计.分析表明:优化后结构不仅具有更轻的质量,而且结构的动力响应大幅度下降,提高了结构的抗爆性能,同时仍满足强度和刚度要求.实例分析表明该模型能应用于工程结构的实际优化设计.更多还原

【Abstract】 Static and dynamic collaborative optimization model of cylindrical shell structure is constructed in this paper for combined static and dynamic properties.There are different objective functions in various subsystem-level optimization models.The objective functions are as follows: minimum structural mass in static model,minimum deformation that is the largest deformation of structure in dynamic model.In system-level optimization model,the objective function is minimum relative deviation between the collaborative objective function and subsystem-level’s.At the same time,a bilevel optimization strategy is proposed which uses the Multi-Island Genetic Algorithm.As an example,a cylindrical shell is implemented with the collaborative optimization model and strategy.The obtained optimal design indicates the great potential of decreasing structural mass and dynamic response under the strength and stiffness requirements.The result shows that the model is feasible and suitable for using in actual optimization problems of engineering structures.更多还原