大气扰动下运输机空投过程建模与仿真分析

Modeling of flight dynamics and analyzing of simulation for airdrop in atmospheric disturbance

研究了三维空间风场下运输机空投货物舱内移动过程中的建模问题。基于矢量法,推导了扰动风影响下空投货物舱内移动飞行过程中六自由度动力学方程,给出了扰动风参数的计算方法。考虑风速沿机身和翼展方向非均匀分布引起的附加气动力作用,提出扰动风场中飞机气动参数修正的一般方法。仿真验证表明,强扰动风将对空投载机阻尼特性、稳定性产生较大影响。增大阻尼回路增益,接通气流角反馈能够改善复杂大气扰动下空投载机的响应特性。

Modeling of transport airdrop with cargo moving inside under three dimensional （3-D） wind field is studied. The six degrees of freedom （6-DOF） equations of airdrop in wind field are inferred based on vector method and the algorithm for calculating wind parameters is presented. The additional aerody- namics induced by the non-uniform distribution of the wind velocity across the body and wing span is con- sidered and a general method is proposed for modifying aerodynamic parameters. Simulation results show that hard disturbance wind would exert enormous effects on the loader damping and stability characteris- tics. Either raising the gain of damping loop or adopting flow angle feedback can improve the performance of loader in atmospheric disturbance.