Bionic flapping method for minisize aircraft

Abstract

The invention relates to a bionic flapping method of mini airplane. Flapping upward stage comprises the following three sections: in preliminary stage flapping wings inverting downward and meanwhile flapping to speed-up to flapping angle of attack upward and flapping speed upward; in intermediate stage flapping wings keeping angle of attack upward and flapping speed upward constant; in ending stage flapping wings starting to turn over upward from angle of attack upward and meanwhile flap to slow down. Flapping downward stage also comprises the following three sections: in preliminary stage flapping wings inverting upward and meanwhile flapping to speed-up to flapping angle of attack downward and flapping speed downward; in intermediate stage flapping wings keeping angle of attack downward and flapping speed downward constant; in ending stage flapping wings starting to turn over downward from angle of attack downward and meanwhile flap to slow down. Flapping upward stage and flapping downward stage cross alternatively and processes cyclical movement. Compared with flapping mode of fruit fly, the present invention reduces friction factor of flapping wings greatly, enhances lift-drag ratio, alleviates feature difference of elevating force among different motor patterns of flapping mode and enhances stability.

Description

technical field [0001] The invention relates to a bionic flapping method for a micro-aircraft. Background technique [0002] Micro air vehicle, referred to as MAVs (Micro Air Vehicles or Micro Aerial Vehicles), is a high-tech that was first proposed by the US DARPA (Defense Advanced Research Projects Agency) in the past ten years and developed rapidly. The goal is to develop a micro air vehicle similar to the size of a hummingbird or an insect. MAVs have broad application prospects. Military such as reconnaissance, target acquisition, weapon delivery, relay communication, etc. Some military theorists even believe that MAV may change the mode of future warfare. Civilian use such as photography, monitoring, investigation, patrolling, sampling, etc. [0003] So far, many countries have set up special research institutions and invested special research funds to research and develop various micro-aircraft with unique performance. There are more than 150 universities and rese...

AI Technical Summary

Problems solved by technology

[0007] (1) The drag coefficient of the flapping wing is much greater than the lift coefficient, the average lift-drag ratio of the flapping wing is relatively low, and the corresponding mechanical energy consumption for overcoming the resistance is relatively high, resulting in a considerable part of the energy consumption of the flapping wing being used to overcome the resistance and do work, which is economical poor;

[0008] (2) The lift-drag characteristics of different motion modes (leading, symmetrical and lagging) of the flapping wing are very different, which is not easy to control

[0009] (3) The movement method is more complicated to realize, the mechanical design is difficult, and it is not easy to realize the large-angle flip during the flapping process, and the complicated mechanism may increase the internal energy consumption of the mechanism;

This kind of research and application is by no means a complete copy and simple imitation of the biological body structure and behavior, because it is unnecessary, often impossible to achieve, and often difficult to achieve the desired effect

For example, humans imitate the flight of birds to design fixed-wing aircraft, but the power plant is fundamentally different from the propulsion method of birds; artificial muscles are developed by imitating the working method of muscles, but the principles of contraction and elongation are different.

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