Folding wings of a flapping-wing aircraft that imitates folding wings of birds and bats

Abstract

The invention provides a folding wing of a flapping wing aircraft that imitates birds and bats. The folding wing comprises an inner main beam (1), an inner front beam (1A), an inner rear beam (1B), amiddle main beam (2), a middle front beam (2A), a middle rear beam (2B), an outer main beam (3), a first biomimetic wing rib (4), a second biomimetic wing rib (5), a sliding groove link (6), a cross flapping shaft (7), a second folding link (9B) and a folding controller. The folding wing has the advantages that the structure of the flapping wing refers to the common characteristics of the wing anatomy of the flying vertebrates, imitates the humerus, the ulnar and radius bones, and the metacarpal and phalangeal bones, and the flapping wing is into an inner segment, a middle segment, and an outer segment; each segment is mainly loaded by the inner main beam, the middle main beam and the outer main beam, and the front and rear auxiliary beams are connected with other auxiliary links through several rotating pairs and sliding pairs, a complex multi-link mechanism is formed; the folding wing can accurately simulate the folding motion of flying vertebrates. The folding wing has the advantages of high aerodynamic efficiency, high degree of bionics and good controllability.

Description

technical field [0001] The invention belongs to the technical field of wing design of a flapping-wing aircraft, and in particular relates to a foldable wing imitating birds and bats of a flapping-wing aircraft. Background technique [0002] The micro flapping wing aircraft is a new concept aircraft that imitates the flight of birds. It has the advantages of small size, light weight, maneuverability and high efficiency. If it is equipped with sensors and related data transmission and flight control systems, it will form a micro flapping wing UAV. platform, it will have broad application prospects. Around this topic, various countries have developed controllable flapping-wing aircraft, among which the more successful ones include the "Microbat" jointly developed by AeroVironment of the United States and the University of California and the "Delfly" of Delft University in the Netherlands. However, these flapping-wing aircraft are far from The aircraft platforms of practical UA...

AI Technical Summary

Problems solved by technology

Its disadvantages are that the shape and structural rigidity of the inner wing section and the outer wing section change suddenly, which is easy to cause structural damage, poor reliability, and the overall aerodynamic efficiency of the wing will be reduced, and the wing simply flutters up and down, with a low degree of bionics , which is less aerodynamically efficient than birds

Its shortcoming is that the flapping wing is folded up and down, instead of extending into the plane like a real bird. The stress conditions at the folding hinge are harsh, and the strength and weight of the crankshaft and tie rod structure are sharply contradictory. It is difficult to have sufficient strength and light weight at the same time, which leads to reduced wing life and poor reliability

Its shortcoming is that the folding effect is completely passively produced by the elastic material under the action of aerodynamic force. When the flapping frequency of the flapping wing is high, the folding effect will be weakened to a considerable extent, and the folding effect is limited by the flapping frequency. The response to dynamic frequency changes is uncontrollable; the aging and life of elastic materials directly affect the overall performance and life of the flapping wing

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