电光与控制, 2013, 20(5): 25, 网络出版: 2013-05-01

风场环境下运输机超低空空投安全性研究

On Safety of UltraLow Altitude Airdrop in Wind Field Circumstances
作者单位

1空军工程大学无人机系

2空军工程大学航空航天工程学院三部, 西安710038

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。
Abstract
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.
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