Method for flight dynamics optimization of small unmanned aerial vehicle based on bionic flexible wing

Abstract

The invention discloses a method for optimizing flight dynamics of a small unmanned aerial vehicle based on a bionic flexible wing, and belongs to the field of overall design and flight dynamics of small fixed-wing unmanned aerial vehicles. According to the method, the bionic flexible wing is designed by imitating geometric and structural features of wings of large gliding birds; based on the bionic flexible wing, the modal analysis is performed on the wing to obtain first few modes of torsion which are very significant; an obtained first few mode equation set and a flight dynamics equation set are synthesized, and aerodynamic coupled terms generated by the elastic deformation are added; the influence of the aeroelastic effect of the bionic wing on the coupled of the flight dynamics is obtained, and critical parameters are refined, signs and sizes of critical parameters are adjusted by adjusting the wing structure design without changing the fuselage structure arrangement and overall pneumatic layout, the coupling form of the aeroelasticity of the wing and the flight dynamics is adjusted to achieve the goals of reducing the short-cycle frequency, increasing the short-cycle dampingratio and slow downing the gust disturbance of the small unmanned aerial vehicle.

Description

technical field [0001] The invention relates to a flight dynamics optimization method based on bionic flexible wings, and belongs to the field of overall design and flight dynamics of small fixed-wing unmanned aerial vehicles. Background technique [0002] For small fixed-wing aircraft, the problem of gust disturbance generated when flying at low Reynolds number has always restricted the development of related technologies. This makes the optimization of its aerodynamic characteristics even more challenging. The flight Reynolds number of large birds, which mainly fly by glide, is similar to that of small UAVs, so they are also more affected by gust disturbances. This has something to do with the aeroelastic effect of the flexible wings of birds. [0003] The bionic flexible wing draws on the structural characteristics of bird wings in design, so that its aeroelastic effect affects the flight dynamics and slows down the dynamic disturbance in gusts of wind. The design of t...

AI Technical Summary

Problems solved by technology

[0004] In the design process of small fixed-wing aircraft, the main feature size must be strictly controlled, and the various subsystems inside the fuselage need to be highly integrated and densely arranged. Such traditional overall design optimization methods will be strictly limited in practical applications

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