飞机机身着陆滑跑动态性能分析

飞机着陆滑跑过程中，机身结构将受到地面较大的冲击作用和振动激励。为预判结构局部危险部位，给结构强度设计提供参考，需对机身着陆滑跑过程中的动态性能进行分析。创新性地考虑了飞机滑跑速度和气动力的变化，计算得出飞机在着陆滑跑过程中较准确的气动力和起落架力，为有限元计算提供了可靠的外载输入。为降低计算规模，应用Patran合理设置约束条件，建立半机体有限元模型。最后将外载荷添加到半机体模型上，提交Nastran计算，提取机身各站位处的载荷响应峰值，做出动响应包线，预判结构局部危险部位，如机翼和机身框架连接处，为结构强度设计提供参考。

Analysis of Dynamic Performance of Aircraft Fuselage When Landing and Taxiing

The fuselage structure suffers large impact and vibration from the ground in landing and taxiing. In order to predict local hazard areas of the structure and provide a reference for structural strength design, it is necessary to implement an analysis on fuselage dynamic performance in landing and taxiing. This paper innovatively considered about changes of aeroplane taxiing rate and the aerodynamic force, so exact aerodynamic and landing gears' forces were gained, which provided a reliable set of external input for finite element calculation. To reduce the size of the calculation, reasonable constrains were set by Patran, half-body finite element aeroplane model was established. Finally, the external loads were added to the half-body model, Nastran was used to calculate the dynamic response, and the peak load response of each airframe station was extracted to make dynamic response envelope, so the local hazardous positions can be pre-estimated to provide references for the structure design, such as the location where the wing and fuselage are connected.