飞机在风切变场中的危险性评估及预警时间的确定

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

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。基于能量的概念，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与实际危险之间的关系，证实了环境风场的危险程度可用危险因子来判断的结论，并通过仿真计算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系，来确定预警时间，为实际过程中确定预警时间提供依据。

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.