Reliability Based Optimization of Composite Laminates for Frequency Constraint  

复合材料层合结构频率约束的可靠性优化设计(英文)

作　　者：吴浩[1] 燕瑛[1] 刘玉佳[1] 

机构地区：[1]北京航空航天大学航空科学与工程学院,北京100083

出　　处：《Chinese Journal of Aeronautics》2008年第4期320-327,共8页中国航空学报（英文版）

基　　金：National Natural Science Foundation of China (51412060104HK0123)

摘　　要：The reliability based optimization （RBO） issue of composite laminates trader fundamental frequency constraint is studied. Considering the tmcertainties of material properties, the frequency constraint reliability of the structure is evaluated by the combination of response surface method （RSM） and finite element method. An optimization algorithm is developed based on the mechanism of laminate frequency characteristics, to optimize the laminate in terms of the ply amount and orientation angles. Numerical examples of composite laminates and cylindrical shell illustrate the advantages of the present optimization algorithm on the efficiency and applicability respects. The optimal solutions of RBO are obviously different from the deterministic optimization results, and the necessity of considering material property uncertainties in the composite structural frequency constraint optimization is revealed.The reliability based optimization （RBO） issue of composite laminates trader fundamental frequency constraint is studied. Considering the tmcertainties of material properties, the frequency constraint reliability of the structure is evaluated by the combination of response surface method （RSM） and finite element method. An optimization algorithm is developed based on the mechanism of laminate frequency characteristics, to optimize the laminate in terms of the ply amount and orientation angles. Numerical examples of composite laminates and cylindrical shell illustrate the advantages of the present optimization algorithm on the efficiency and applicability respects. The optimal solutions of RBO are obviously different from the deterministic optimization results, and the necessity of considering material property uncertainties in the composite structural frequency constraint optimization is revealed.

关 键 词：fundamental frequency reliability based optimization （RBO） response surface method （RSM） basic random variable （BRV） failure probability deterministic optimization 

分 类 号：V229.7[航空宇航科学与技术—飞行器设计]