Passive luffing flapping mechanism and flapping method

Abstract

The invention provides a passive amplitude changing flapping mechanism and a flapping method. The passive amplitude changing flapping mechanism comprises a rack, a motor, a speed reduction gear set and a flapping rod set. The side face of a secondary driven gear is dug to form a protecting cover groove, a torsional spring groove and an arc-shaped sliding groove, and a gear protecting cover, an amplitude adjusting torsional spring and a connecting rod shaft are assembled in the grooves respectively. The connecting rod shaft comprises an arc-shaped sliding block and a shaft body, and the arc-shaped sliding block is matched with the arc-shaped sliding groove and can slide freely along the arc-shaped sliding groove. One end of the shaft body is arranged on the outer surface of the arc-shaped sliding groove, and is perpendicular to the outer surface of the arc-shaped sliding groove. The passive amplitude changing flapping mechanism has the advantages that the self amplitude changing function of the mechanism can be achieved in a torsional spring limiting mode, that is, the flapping amplitude can be automatically increased under heavy loads and can be automatically decreased under small loads without active intervention, and therefore the flight performance of a flapping wing air vehicle is improved.

Description

technical field [0001] The invention belongs to the technical field of flapping wing drive mechanisms, and in particular relates to a passive luffing flapping mechanism and a flapping method. Background technique [0002] The flapping wing aircraft is a bionic aircraft that imitates the flight of birds or insects in nature. It has the characteristics of small size, light weight, high concealment and flexible use, and has broad application prospects. [0003] As a key component of the flapping-wing aircraft, the flapping mechanism directly determines the flight performance of the flapping-wing aircraft. By observing the flight methods of birds, it is found that most birds adapt to different flight states by changing the flapping range of their wings. This can also be confirmed by scientific experiments, namely wind tunnel experiments. Wind tunnel experiments show that within a certain range, the aerodynamic force of the flapping wing increases with the increase of the flapp...

AI Technical Summary

Problems solved by technology

[0004] Although the existing flapping mechanism can realize the flapping action, most of the flapping mechanisms can only perform a single amplitude flapping and cannot change the flapping amplitude, thus affecting the flight performance of the flapping wing aircraft

In addition, although there are a few flapping mechanisms that can realize the amplitude-changing function to a certain extent, in order to realize the function of the amplitude-changing flapping, complex control mechanisms are often added, so it is necessary to improve the reliability, weight and volume of the mechanism. Pay a corresponding price, and even offset the contribution of the amplitude change to improve the performance of the aircraft

It can be seen that the above problems restrict the development of flapping wing aircraft from the aspect of hardware architecture

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