基于航道3段越障的民用运输机障碍物限制起飞重量计算模型  

Calculation Model of Obstacle Limited Takeoff Weight for Civil Transport Aircraft Based on the Third Segment of the Takeoff Flight Path

作　　者：刘羽宇[1] 王可[1] 杨军利[1] LIU Yu-yu;WANG Ke;YANG Jun-li(Department of Flight Technology College, Civil Aviation Flight University of China, Guanghan 618307, China)

机构地区：[1]中国民用航空飞行学院飞行技术学院,广汉618307

出　　处：《科学技术与工程》2022年第3期1279-1285,共7页Science Technology and Engineering

基　　金：民航安全能力建设基金(DFS20180406)。

摘　　要：为研究障碍物对民用运输机最大起飞重量的影响,根据飞机在空中的受力特点及CCAR25-R4的要求,建立了基于航道3段越障的障碍物限制起飞重量的计算模型。模型根据飞机的空中运动方程推导出飞机总航迹和净航迹,再由净航迹的垂直高度与障碍物的高度之间的关系判断飞机是否可以安全越障。计算分析了计算步长、障碍物高度、顺逆风对最大起飞重量的影响。结果表明:改平高度与实际情况相符,障碍物限重规律与根据飞行手册得出的结论一致,计算结果合理;计算步长取1 s能够获得较好的计算精度和时间效率;障碍物限重、改平点和改平高度均与障碍物的高度和位置有关;顺风或逆风对障碍物限重的影响为线性关系,同样的风速大小,顺风使起飞重量的减小量大于逆风使起飞重量的增加量;计算模型可为研究障碍物限重提供理论参考。In order to study the influence of obstacles on the maximum take-off weight of civil transport aircraft,according to the force characteristics of the aircraft in the air and the requirements of CCAR25-R4,a calculation model of obstacle limited takeoff weight based on the third segment of the take-off flight path was established.According to the motion equations of the aircraft,the gross flight path and the net flight path of the aircraft were derived,and then the relationship between the vertical height of the net flight path and the height of the obstacles was used to judge whether the aircraft can fly over the obstacles safely.The influence of calculation step,height of the obstacles and wind speed on the maximum take-off weight was analyzed.The results show that:The level off height is consistent with the actual situation,and the law of the obstacle limited weight is consistent with the conclusion drawn from the flight manual,and the calculation result is reasonable;The better calculation accuracy and time efficiency can be obtained when the calculation step is 1 s;The obstacle limited weight,the level off point and the level off height are related to the height and position of the obstacles;the influence of downwind or upwind on the obstacle limited weight is linear;at the same wind speed,the weight reduction caused by downwind is greater than the weight increase caused by upwind;The calculation model can provide theoretical reference for the study of the obstacle limited weight.

关 键 词：民用运输机 障碍物限制起飞重量 总航迹 净航迹 

分 类 号：V212.13[航空宇航科学与技术—航空宇航推进理论与工程]