FMS巡航阶段的垂直轨迹预测算法及应用

The vertical trajectory prediction algorithm of FMS for the cruise flight phase and its application

飞机的飞行过程涉及多个垂直飞行阶段,巡航阶段占了绝大部分的飞行时间、飞行距离及燃油消耗,研究飞行管理系统(FMS)巡航阶段的垂直轨迹预测算法,对于提升飞行的经济性、舒适性、安全性是非常重要和必要的。为了满足不同类型飞机巡航阶段垂直轨迹预测算法的通用性,提高垂直轨迹预测的精确度和可信度,提出一种适用于巡航阶段的垂直轨迹预测算法。首先,通过计算巡航阶段的速度剖面,并构建预测过程中更加符合实际的大气模型;然后基于第一性原理(第一法则)的飞机模型计算所需的巡航燃油流量数据,通过设计的巡航阶段垂直轨迹预测算法逻辑,给出巡航阶段预测的垂直轨迹;最后通过地面仿真试验和空中试飞验证算法的有效性与准确性。结果表明:本文提出的基于第一性原理飞机模型的FMS巡航阶段垂直轨迹预测算法能够预测飞机的巡航轨迹,且预测精度误差低于1%。

It is well known that there are several vertical flight phases for the aircraft in the flight.The cruise flight phase takes most of the flight time,flight distance and fuel consumption,so it is important and necessary to devel-op the flight management system(FMS)vertical trajectory prediction algorithm for the cruise flight phase,aiming to improve the economy,comfort and safety of the flight.In order to meet the versatility of the vertical trajectory prediction algorithm between different types of aircraft in the cruise phase and improve the accuracy and reliability of the vertical trajectory prediction,the algorithm of vertical trajectory prediction for cruise flight phase is proposed in this paper.Firstly,the cruise speed profile is calculated,and the realistic atmospheric model of prediction is con-structed.Then the cruise fuel flow data is calculated based on the aircraft model of first-principles,and the vertical trajectory prediction for the cruise phase is given by designing the vertical trajectory prediction algorithm logic.Fi-nally,the effectiveness and accuracy of the algorithm are verified by ground simulation and air flight test.The re-sults show that the vertical trajectory prediction algorithm of FMS cruise phase based on the aircraft model of first-principles can predict the cruise trajectory of the aircraft,and the prediction accuracy error is less than 1%.