后机身蒙皮的改进优化

Optimization Design of the Rear Fuselage Skin

后机身蒙皮是结构的重要组成部分,其承受尾翼带来扭转等不同部件传递来的多方向载荷,适于发挥复合材料各向不同性的优势。由于受力方向多样化,合理设计铺层角度、铺层比例、铺层顺序和铺层厚度等参数以获得最大的减重收益,是复合材料蒙皮壁板设计的重点和难点。该文利用hyperworks有限元分析软件,将某型机的后机身上壁金属蒙皮改进为复复合材料结构,进行形状、尺寸和铺层顺序优化,结果表明:优化后满足强度、刚度和稳定性要求且获得了显著的减重效益。

The rear fuselage skin is an important part of the aircraft structure and it bears torque from tails and other loads in different directions, therefore logically benefits from orthotropic composite materials. Given that the multiplicity of loads exists, how to achieve reasonable degrees, proportions and thicknesses of the composite plies and reduce the structural weight to a maximal extent always is an emphasis of skin design. The traditional metal upper skin of the rear fuselage was replaced with composite skin optimized in aspects of shape, sizes and ply sequence. The results show that the optimized skin is reasonable in strength, stiffness, stability with considerably reduced weight.