Design of a Bionic Dragonfly Robot Based on a Two-Stage Single Crank Rocker Mechanism

Abstract

Dragonflies are considered to be one of the insects with simple and efficient flight behaviors, which makes them the prototype of many biomimetic designs for microlight vehicles. The excellent flight characteristics of dragonflies are inseparable from the characteristics of their wings, which only use 3 % of the total mass of their body to provide the power needed for their flight attitudes, which shows the advantages of the mechanical properties of their wings. It can not only withstand a variety of loads during the flight process, but also to maintain efficient flight characteristics. Therefore, it is necessary to study the mechanical properties and bionic optimization of dragonfly wings. In this work, we take the flight of dragonfly as the research object, and design a bionic dragonfly flapping wing vehicle based on a two-stage single crank rocker mechanism. In addition, we focus on the excellent mechanical properties of dragonfly wings in terms of anterior-posterior phase difference, wing vein structure, wing membrane structure, etc., and design two pairs of wings with strong load-bearing capacity and good tear-resistant capacity, with an anterior-posterior phase difference of 45 degrees, and a maximum wingspan of 25 cm. Finally, the head and body of the dragonfly are fabricated by 3D printing technology according to the dragonfly's shape structure, with the overall mass of 90 g. The structure is lightweight, and the flight is easy. The overall mass is 90g, and the structure is lightweight and easy to fly.