Shape And Size Of The High Aspect Ratio Wing Structure Topology Optimization Design

Recently, layout optimization is the most challenging and hot, as well as difficult research topic in structure optimization. It places a very large effect on the result of aircraft design and can be obtained much more benefit. In this paper, the full composite aircraft structures of a flying-wing configuration design optimization problems has inevitably led to the growth in the size of optimization problem with large numbers of design variables and constraints being required in a design with strong interaction between the various structural parameters.In order to reduced the degree of complexity and the numbers of design variables, we mainly solve the layout optimization of spars, with the strategy of hierarchy optimization, present a two-level approach in which topology, shape and sizing optimization were included. In the first level an improved ESO(evolutionary structural optimization) and variable density method was used to determined the optimal number and position of spars and in the second one hybrid algorithm which consists of complex method and MSC.NASTRAN were used to determined the precise position and the size of all wing components. The complex method is used to optimize the shaping design variables and MSC/NASTRAN used to optimize the sizing design variables.During the optimization process, topology optimization is independent and the other two optimization were interacted with each other. The second level optimization is based on the first level and the advancement of the first one. The optimization results of the flying-wing structure in this paper indicate that the two level optimization is effective and feasible for solving complex optimization and has good efficiency in the cutting of weight.