基于相似理论的飞机实际着陆距离预测方法

为防止飞机着陆时冲出跑道事件的发生,提出一种基于相似理论的飞机实际着陆距离预测方法。首先,通过量纲分析法结合影响飞机实际着陆距离的主要因素,推导出表征实际着陆距离的无量纲方程;然后,利用真实飞行数据,得出不同接地俯仰角条件下飞机实际着陆距离的预测方程;最后,对比分析方程预测结果与由真实数据所得的飞机实际着陆距离。结果表明:采用该方法能够在不同接地俯仰角条件下预测飞机实际着陆距离;在小接地俯仰角条件下,预测值与实际值吻合度最高,最大绝对误差在50 m范围内,最大相对误差约为3%。

Prediction method of actual operating landing distance based on similarity theory

In order to prevent plane from overshooting runway on landing,a method was proposed to predict flights’ actual operating landing distance based on similarity theory. Firstly,combined dimensional analysis with main factors that affect actual landing distance of aircraft,dimensionless equation that characterize operating landing distance was obtained. Then,digital flight data was used to further establish equation that predict flights’ actual operating landing distance under different touchdown pitch angles.Finally,prediction values of equation were compared with actual operating landing distance of aircrafts.The results show that this method is able to predict flights’ actual operating landing distance and deviation between predicted value and practical value is minimum under condition of small touchdown pitch angle.The maximum absolute error is less than 50 meters,and the maximum relative error is about 3%.