Adaptive Approximation-based Optimization of Composite Advanced Grid-stiffened Cylinder  

基于自适应近似法的复合材料先进格栅加筋结构优化设计(英文)

作　　者：吴浩[1] 燕瑛[1] 闫伟[1] 廖宝华 

机构地区：[1]航空科学与工程学院北京航空航天大学,北京100191

出　　处：《Chinese Journal of Aeronautics》2010年第4期423-429,共7页中国航空学报（英文版）

基　　金：National Basic Research Program of China (070022);Ph.D.Innovation Foundation of Beijing University of Aeronautics and Astronautics

摘　　要：An adaptive approximation-based optimization （AABO） procedure is developed for the optimum design of a composite advanced grid-stiffened （AGS） cylinder subject to post-buckling. The design taking account of post-buckling under ultimate load will be able to promote the structural efficiency compared to the conventional design in which only the linear buckling is allowed. The beam-shell offsets technique is utilized for modeling the stiffener-skin connection, and the Newton-Raphson method is employed for the post-buckling analysis. A few structural analysis efforts are carried out for establishing the Kriging model of the collapse load of the AGS cylinder for optimization to significantly increase the optimization efficiency. The multi-island genetic algorithm （MIGA） is utilized for global optimum search. An adaptive approximation framework is proposed to resolve the computational burden caused by the large domain of design variables, and it is demonstrated that much less computational expense than that of the traditional approximation-based optimization method can be achieved. The utility of making use of commercial optimization package iSIGHT in conjunction with the finite element （FE） code MSC.MARC to develop the preliminary design tool of the composite AGS cylinder is evaluated as well.An adaptive approximation-based optimization （AABO） procedure is developed for the optimum design of a composite advanced grid-stiffened （AGS） cylinder subject to post-buckling. The design taking account of post-buckling under ultimate load will be able to promote the structural efficiency compared to the conventional design in which only the linear buckling is allowed. The beam-shell offsets technique is utilized for modeling the stiffener-skin connection, and the Newton-Raphson method is employed for the post-buckling analysis. A few structural analysis efforts are carried out for establishing the Kriging model of the collapse load of the AGS cylinder for optimization to significantly increase the optimization efficiency. The multi-island genetic algorithm （MIGA） is utilized for global optimum search. An adaptive approximation framework is proposed to resolve the computational burden caused by the large domain of design variables, and it is demonstrated that much less computational expense than that of the traditional approximation-based optimization method can be achieved. The utility of making use of commercial optimization package iSIGHT in conjunction with the finite element （FE） code MSC.MARC to develop the preliminary design tool of the composite AGS cylinder is evaluated as well.

关 键 词：composite materials OPTIMIZATION POST-BUCKLING full-factorial design Kriging model multi-island genetic algorithm 

分 类 号：V214.8[航空宇航科学与技术—航空宇航推进理论与工程]