考虑入水冲击过程的舱段结构优化OACSTPCD

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.