基于多岛遗传算法的自由曲面层合壳铺层优化
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摘要
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.
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.
引文
[1]唐文艳,顾元宪,赵国忠.复合材料层合板铺层顺序优化遗传算法[J].大连理工大学学报,2004,44(2):186-189.
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[8]CHEN H,OOKA R,KATO S.Study on optimum design method for pleasant outdoor thermal environment using genetic algorithms(GA)and coupled simulation of convection,radiation and conduction[J].Building&Environment,2008,43(1):18-30.
[2]修英姝,崔德刚.复合材料层合板稳定性的铺层优化设计[J].工程力学,2005,22(6):212-216.
[3]LE-MANH T,LEE J.Stacking sequence optimization for maximum strengths of laminated composite plates using genetic algorithm and isogeometric analysis[J].Composite Structures,2014,116(1):357-363.
[4]冯鹏.复合材料在土木工程中的发展与应用[J].玻璃钢/复合材料,2014(9):99-104.
[5]马晓永,范召林,吴文华,等.基于NURBS方法的机翼气动外形优化[J].航空学报,2011,32(9):1616-1621.
[6]沈世钊,武岳.结构形态学与现代空间结构[J].建筑结构学报,2014,35(4):1-10.
[7]HU X,CHEN X,ZHZO Y,et al.Optimization design of satellite separation systems based on Multi-Island Genetic Algorithm[J].Advances in Space Research,2014,53(5):870-876.
[8]CHEN H,OOKA R,KATO S.Study on optimum design method for pleasant outdoor thermal environment using genetic algorithms(GA)and coupled simulation of convection,radiation and conduction[J].Building&Environment,2008,43(1):18-30.