伸缩翼无人机非对称伸缩状态颤振特性研究

Study on the Asymmetric Extension States" Flutter Characteristics of a Telescopic Wing UAV

摘要:

伸缩翼无人机不仅具有良好的宽速域飞行性能，还能利用机翼非对称伸缩进行飞行控制。以机翼可非对称伸缩无人机为研究对象，将其伸缩过程进行状态离散并考虑结构与气动力的非对称性建立非对称状态动力学有限元模型，研究机翼非对称伸缩状态下颤振特性的变化规律。结果表明：伸缩翼无人机非对称伸缩状态的颤振速度与颤振频率均高于基准对称状态；当伸缩非对称度增大到一定值之后，颤振形式由体自由度颤振转变为弯扭耦合颤振，使得颤振速度与颤振频率显著增大。

Abstract:

Telescopic wing UAVs not only exhibit excellent flight performance across a wide speed range but can also utilize asymmetric wing extensions for flight control. This study focuses on a UAV with asymmetrically extendable wings. The extension process is discretized into distinct states, and a dynamic finite element model considering both structural and aerodynamic asymmetries is established to investigate the changes in flutter characteristics under asymmetric extension. The results show that both the flutter speed and flutter frequency in the asymmetric extension states are higher than those in the baseline symmetric state. As the asymmetry degree increases, the form of flutter transitions from body freedom flutter to bending-torsion coupling flutter, resulting in significant increases in both flutter speed and flutter frequency.