基于多岛遗传算法的自由曲面层合壳铺层优化

Stacking sequence optimization of free-form FRP shells based on the multi-island genetic algorithm

采用多岛遗传算法,以自振频率最大为优化目标,对自由曲面层合壳的铺层顺序进行优化研究。其中,自由曲面层合壳的几何形状通过非均匀有理B样条(NURBS)进行建模,结构有限元模型的创建和自振频率的计算通过ANSYS完成,多岛遗传算法通过软件Isight实现,并与ANSYS连接实现铺层顺序优化。最后,通过算例分别对正高斯、负高斯、正负高斯曲率自由曲面层合壳进行优化分析,获得了最优的铺层顺序。算例结果表明,提出的优化自由曲面层合壳铺层顺序方法是准确、有效的。

An approach to maximize the fundamental frequency of free-form FRP shells using the multiisland genetic algorithm is proposed in this paper.The geometry of free-form FRP shells is generated by the NURBS technique.The creation of structural finite element model and the calculation of the fundamental frequency are carried out by ANSYS.The multi-island genetic algorithm is embedded in Isight and stacking sequence of the free-form FRP shell is optimized by using Isight to integrate ANSYS.Finally,three free-form FRP shells with the positive,negative,positive and negative Gaussian surface are optimized to obtain the optimum stacking sequence.The numerical examples show that the proposed method for stacking sequence optimization of free-form FRP shells is accurate and effective.