大展弦比弹性飞机着陆特性分析

Elastic model for high aspect ratio airplane landing impact analysis

为研究弹性体飞机着陆冲击特性,以大展弦比全球鹰无人机为例,基于拉格朗日方法建立了刚弹耦合的弹性飞机动力学方程,对其着陆特性进行了仿真分析。研究结果表明:弹性效应可以降低缓冲器载荷、轮胎载荷、轮胎压缩量以及有效降低起落架和机体过载等,缺点在于使缓冲器耗散效率降低,冲击耗散时间变长,造成飞机着陆品质恶化;增大飞机结构阻尼系数可以提高冲击耗散效率,降低冲击耗散时间,改善飞机着陆品质。

This paper takes the Global Hawk Unmanned Aerial Vehicle with high aspect ratio as an exampie to study the feature of elastic airplane landing impact, a rigid-elastic coupling equation is built on the basis of Lagrange equations to simulate and analyze its landing characteristics. It is demonstrated that elastic effects can improve the mechanical properties, but the effect of energy dissipation decreases and the time of energy dissipation increase, the structure damping can alleviate the major limitation, and improve the whole landing impact characteristics.