Civil Aviation Flight University of China
航空公司使用多年的某国产民用飞机性能软件，在障碍物限重计算准确性方面虽能获得较满意的结果，但计算时间较长。分析该软件所用计算模型计算效率较低的原因，通过对比采用最小改平高和采用最大改平高两种模型的计算结果和计算效率，建立优化模型，计算不同障碍物、不同风速条件下，优化模型与原模型的障碍物限重、改平高度和计算时间，并进行比较分析。结果表明：两种模型的障碍物限重和改平高度计算结果基本相同；无障碍物时，不论有风无风，采用最小改平高的优化模型相对采用最大改平高的原模型均可减少计算时间25%；有障碍物时，无风情况下，采用最小改平高的优化模型可减少计算时间78% 以上，有风时，则可减少计算时间75% 以上。采用最小改平高的模型可以兼顾准确性和高效性。
In order to improve the calculation efficiency of the obstacle limited takeoff weight calculation model of a domestic civil transport aircraft, its algorithm was studied in detail, and the reasons for the low calculation efficiency of the model were analyzed. On this basis, an optimized calculation model was established in combination with relevant civil aviation regulations. The obstacle limited weight, acceleration height and calculation time of the optimization model and the original model under different obstacles and different wind speeds were calculated and compared. The results show that the obstacle limited weight and acceleration height calculated by the optimization model are basically the same as those calculated by the original model; The original model uses the maximum acceleration height method to determine the obstacle limited takeoff weight, there are two unknowns: takeoff weight and maximum acceleration height, more iterations and longer calculation time; The optimization model adopts the method of minimum acceleration height, only the takeoff weight is an unknown quantity, which can shorten the calculation time and greatly improve the calculation efficiency on the premise of ensuring the accuracy of the calculation results; While calculating the take-off flight path, judging whether the aircraft can cross the obstacles can reduce the calculation time ; The optimization model also has reference significance for the calculation of obstacle limited takeoff weight of other types of civil transport aircraft.