电光与控制, 2013, 20 (5): 25, 网络出版: 2013-05-14
风场环境下运输机超低空空投安全性研究
On Safety of UltraLow Altitude Airdrop in Wind Field Circumstances
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 ultralow altitude airdrop in three dimensional (3D) wind field were inferred based on vector method.The additional aerodynamics induced by the nonuniform 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 fourpoint model.From dynamic functions and the aerodynamics derivativethe 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 signswhich may disturb the pilot operationsand 2) under strong crosswindthe aircraft wingtip may contact to earth as a radical lateral roll.
刘日, 孙秀霞, 李大东, 董文瀚. 风场环境下运输机超低空空投安全性研究[J]. 电光与控制, 2013, 20(5): 25. LIU Ria, SUN Xiuxiaa, LI Dadonga, DONG Wenhanb. On Safety of UltraLow Altitude Airdrop in Wind Field Circumstances[J]. Electronics Optics & Control, 2013, 20(5): 25.