HWB中央机体结构非线性分析与方案优化设计方法研究

As one of the most potential large-scale civil aircraft in the next generation, hybrid wing body (HWB) civil aircraft has attracted much attention, but low loading efficiency and poor stability caused by non-circular cross section fuselage structure had been main structure design problem restricting development of this type aircraft, central section structure based on PRSEUS concept put forward by Boeing Company and NASA provides a technological approach to solve this problem. In order to further investigate the load-bearing characteristics, nonlinear analysis method and optimization strategy of the central section structure of HWB civil aircraft, for HWB central body structure on basis of PRSEUS concept, high fidelity finite element model, boundary and loading application are presented in this paper according to geometrical design requirements and complicated loading characteristics. Then, non-linear analyses of HWB central body structure are carried out based on representative loading conditions. Finally, scheme optimization design of HWB central body structure is conducted by multi-island genetic optimization algorithm. The non-linear analyses method of HWB central body structure is proven to be of better prediction ability for deformation distribution by comparing with references. The proposed optimization design strategy has certain value in applications of engineering.