飞机在风切变场中的危险性评估及预警时间的确定

对飞机在风切变场中的危险性评估及预警时间的确定进行了研究。基于能量有概念,从飞机六自由度非线性方程出发,导出了比能量变化率和危险因子的完整表达式,通过灵敏度分析和仿真计算,描述了各个风矢量对能量的影响,为设计风切变探测器提供了理论依据。文中还用灰色系统理论分析了危险因子民实际之间的关系,证实了环境风场的危险程可用危险因子来判断的结论,并通过仿真飞机穿越几种不同风场时,不同的预警时间与飞机能耗的关

A Determination of Hazard and Alert Time for an Aircraft Flying in Wind-Shear Field

The evaluation of the dangers and the prediction of alert time are studied for an aircraft flying in a wind-shear field. The expressions of the specific total energy rate and the "F-factor" are presented from aircraft six-degree-of-freedom motion equations. By means of sensitivity analysis and emulation computation, the effect of each wind vector on the specific total energy is described. The relationship between "F-factor" and the true hazard based on the grey system theory is also analysed. Finally, through the emulation computation of the airplane passing through several different wind-shear fields, the relationship between different alert time and the specific energy comsumption of the airplane is found to determine the alert time.