考虑入水冲击过程的舱段结构优化  

Optimization of a Cabin Structure Considering the Water⁃Entry Process

作　　者：何子懿 王晨[1] 胡奇 董松文 张雨[1] 沈星[1] 张军[1] HE Ziyi;WANG Chen;HU Qi;DONG Songwen;ZHANG Yu;SHEN Xing;ZHANG Jun(College of Aerospace Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,P.R.China;China Special Vehicle Research Institute,Jingmen 448035,P.R.China)

机构地区：[1]南京航空航天大学航空学院,南京210016 [2]中国特种飞行器研究所,荆门448035

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2024年第3期359-371,共13页南京航空航天大学学报（英文版）

基　　金：The work was supported by the National Natural Science Foundation of China(No.52305262);the Starting Grant of Nanjing University of Aeronautics and Astronautics(No.1001-YQR22056).

摘　　要：水陆两栖飞机的舱段结构在入水过程中需要承受入水冲击力的作用,对水陆两栖飞机的结构性能有着重要影响。本文建立了水陆两栖飞机的初始舱段结构模型,基于该结构通过数值仿真方法获取了结构入水过程中的压强分布。建立了舱段结构的有限元模型并开展了参数分析,探究了不同设计参数对舱段结构的影响。在此基础上,考虑舱段入水过程中的结构变形与应力分布,搭建了舱段结构优化设计框架;以舱段结构的应力和应变作为约束、减少质量为目标开展优化设计;根据优化后得到的舱段结构,进一步验证了单向耦合分析方法的准确性。优化结果表明,舱段结构的底面加强筋分布以及底面蒙皮厚度对入水过程中结构产生的最大米塞斯应力有着重要影响。通过对舱段结构的设计参数开展优化设计,可以在满足强度与刚度的前提下,显著降低舱段结构的质量。The cabin structure of amphibious aircraft needs to withstand the impact force in the process of water-entry,which will affect the performance of amphibious aircraft significantly.A baseline cabin structure for an amphibious aircraft is established.According to the cabin geometry,the pressure distribution on the cabin during the water-entry process is obtained by numerical simulation.A finite element model of the cabin structure is established and the parametric study is carried out to obtain the effects of different design parameters on the cabin structure.Then,a framework is built to optimize the cabin structure,with the structural deformation and stress distribution during the water-entry process taken into account.In the optimization,the strain and stress are regarded as the constraints and the structure mass is the objective.After the optimization,the optimized design is further verified using the one-way coupling analysis method.The results show that the distribution of internal stringers and the thickness of the bottom skin have a significant influence on the maximum von Mises stress.By optimizing the design parameters of the cabin structure,the structure mass can be significantly reduced while the structural strength and stiffness can satisfy the constraints simultaneously.

关 键 词：舱段结构 水陆两栖飞机 流固耦合 入水冲击 结构优化 

分 类 号：V214.19[航空宇航科学与技术—航空宇航推进理论与工程]