高空太阳能无人机飞行动力学建模与分析

Modelling and analysis on flight dynamics of high altitude solar UAV

高空长航时太阳能无人机的机翼是超柔性结构,在飞行中气动弹性变形体现了几何非线性特征,并与飞行动力学响应耦合,从而改变无人机的飞行特性。基于哈密顿原理,对柔性无人机进行了动力学建模,计算了不同装载时无人机的配平状态,并对飞行动力学特性进行了分析。结果表明,由于弹性变形和集中载荷的影响,无人机的短周期频率减小且阻尼增大,长周期运动与结构变形运动发生耦合,导致长周期的阻尼减小。

High altitude long endurance （HALE） solar powered UAV is highly flexible in flight, the aircraft motion is coupled with geometrically nonlinear structural deformation. This paper establishes mathematical model for the flexible UAV with large deformation based on Hamilton priciple, it can be used for analysis of triming of the UAV and flight dynamics analysis about the trimmed-state. Results are generated for a typical high-aspect-ratio solar UAV, on account of flexibility, the pair of complex short-period roots merges to become real roots, and the phugoid mode goes unstable.