摘要
基于矢量法推导了三维空间风场扰动下,超低空空投货台舱内移动飞行过程中六自由度动力学方程。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,提出了基于四点模型的风梯度建模与解算方法。通过动力学方程、气动导数构型,分析了货台运动和扰动风对空投载机品质特性的影响机理。仿真研究了紊流和侧风扰动下空投过程载机安全性和操纵性,结果表明:强紊流场会使载机载荷因数正负交替地振荡,干扰驾驶员操纵;强侧风环境下,载机可能因大幅滚转而使翼尖触地。
The six degrees of freedom （6D） dynamic equations for ultra-low altitude airdrop in three dimensional （3D） wind field were inferred based on vector method. The additional aerodynamics induced by the non-uniform distribution of the wind velocity across the body and wing span was taken into consideration. A general method was proposed for wind gradient modeling and computing based on four-point model. From dynamic functions and the aerodynamics derivative, the effects of the moving platform and the wind on the aircraft were analyzed. Simulation results show that： 1 ） hard turbulence can make the load factors oscillate with alternative signs, which may disturb the pilot operations, and 2 ） under strong crosswind, the aircraft wingtip may contact to earth as a radical lateral roll.
出处
《电光与控制》
北大核心
2013年第5期25-30,48,共7页
Electronics Optics & Control
基金
国家自然科学基金资助项目(60904038)
航空科学基金资助项目(20121396008)
关键词
超低空空投
风扰动
动力学建模
安全性研究
ultra-low altitude airdrop
wind disturbance
dynamic modeling
safety research
