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Optimization method of flight dynamics for small unmanned aerial vehicles based on bionic flexible wings

A technology of unmanned aerial vehicles and flight dynamics, applied in design optimization/simulation, instrumentation, computer-aided design, etc., can solve problems such as limitations

Active Publication Date: 2021-04-09
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Optimization method of flight dynamics for small unmanned aerial vehicles based on bionic flexible wings
  • Optimization method of flight dynamics for small unmanned aerial vehicles based on bionic flexible wings
  • Optimization method of flight dynamics for small unmanned aerial vehicles based on bionic flexible wings

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Embodiment 1

[0068] The initial design index input of this embodiment is: small unmanned aerial vehicle cruising speed u 0 =15m / s, wingspan b=1.7m, and the mass of the whole machine is 2.5kg. The longitudinal gust speed in the simulation is designed as w g = 3m / s.

[0069] Such as figure 1 As shown, the method for optimizing the flight dynamics of a small unmanned aerial vehicle based on bionic flexible wings disclosed in this embodiment includes the following steps:

[0070] Step 1: Design the aerodynamic shape of the bionic flexible wing according to the input of the initial design index of the small unmanned aerial vehicle. The aerodynamic shape designed in this embodiment is as follows figure 2 (b) shown. Among them, the design of the membrane airfoil of the wing has received such figure 2 (a) Inspired by the bird wing airfoil shown.

[0071] Step 2: On the basis of the aerodynamic shape of the film wing designed in step 1, the overall design of the small unmanned aerial vehic...

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Abstract

The invention discloses a method for optimizing the flight dynamics of a small unmanned aerial vehicle based on a bionic flexible wing, which belongs to the field of overall design and flight dynamics of a small fixed-wing unmanned aerial vehicle. The present invention designs a bionic flexible wing by imitating the geometric and structural characteristics of large-scale gliding birds; based on the bionic flexible wing, the first few order modes of the torsional part are obtained through analysis of the wing modal; the obtained first few order modes Combine the modal equations with the flight dynamics equations, and add the aerodynamic coupling term caused by elastic deformation; obtain the influence of the aeroelastic effect of the bionic wing on the flight dynamics coupling, and refine the key parameters, without changing the fuselage structure In the case of layout and overall aerodynamic layout, adjust the sign and size of key parameters by adjusting the wing structure design, and then adjust the coupling form of wing aeroelasticity and flight dynamics to reduce short-cycle frequency and increase short-cycle damping The purpose of reducing the gust disturbance of small UAVs.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/15G06F30/23G06F30/28G06F113/08G06F119/14
CPCG06F30/15G06F30/23G06F2119/06Y02T90/00
Inventor 王正杰张硕张之得
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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