复合材料分区域铺层的滑橇式起落架落震性能研究OA

Drop performance is an important indicator to measure the impact resistance and buffer energy absorption of the landing gear during landing,and improving the drop performance of the landing gear can enhance its safety and stability and improve its service life.Based on the performance requirements of a certain type of unmanned helicopter,the structural design of the skid-type landing gear of this type of UAV is carried out,and its finite element model is established.In the process of finite element fall analysis,the sub-regional layup method is determined,the Hashin damage criterion is introduced to determine whether the damage failure occurs after the landing gear fall,and the maximum impact acceleration amax and the instantaneous maximum strain energy Emax are used as the research indexes of the fall.Through the analysis of the landing gear thickness of 0°,45°,-45° and 90° on the landing gear thickness on the drop performance,the optimal combination of layers in each area was obtained.The surrogate model method and NSGA-Ⅱ.algorithm were used to optimize the design of the ply in each region.The results show that compared with the initial uniform layup design,the optimized amax is reduced by 7.08％and the Emax increased by 5.42％,and the landing gear landing performance of the optimized post-layup design is improved.The research method in this paper has certain reference significance for promoting the development of aircraft structure lightweight and safety and reliability.