Research On Aerodynamic Characteristics Of Deployable Flapping Wings Of The MAV Based On The Hind Wings Of The Migratory Beetle

Migratory beetles have excellent flight performance,which reduces the size of their hind wings by folding them when they are not flying,thus hiding under the elytra to avoid breakage and rapidly deploying when they need to take off.This ingenious hind wing structure provides new inspiration for the design of bionic deployable wings.In this paper,three migratory beetles,Protaetia brevitarsis,Anoplophora chinensis and Trypoxylus dichotomus,were taken as the research objects to systematically study the structural morphology and material mechanical properties of the hind wings,and the influence of their deployable hind wings structures on the aerodynamic characteristics were tested and analyzed by wind tunnel tests.In addition,a bionic deployable wing was designed based on the hind wings of Protaetia brevitarsis as the bionic prototype,and its parametric aerodynamic characteristics were analyzed by simulation and wind tunnel tests.The structural morphology of the surface and profile of the hind wings of three migratory beetles were studied and tested by using a super depth-of-field microscope and SEM,and the structural bionic elements were obtained.The material mechanical properties of different wing veins and membranes of hind wings were tested by the nano-mechanical test system,and the corresponding material biomimetic elements were obtained.The effects of different deployable hind wings structures on the aerodynamic characteristics of migratory beetles were analyzed by wind tunnel tests with a low-speed straight-flow wind tunnel,and the best bionic prototype was obtained.A high-speed camera was used to capture the flight attitude and establish the flight coordinate system of migratory beetles.According to the bionic elements of the structure and materials obtained,a three-dimensional coupling model of the hind wing of Protaetia brevitarsis was established,and the structural statics was analyzed by ANSYS Workbench,and the force and deformation were discussed.Based on the above research,a bionic deployable wing was designed,and its structural statics and aerodynamic characteristics were analyzed by ANSYS Workbench and Fluent.Finally,the bionic deployable wing prepared by 3D printing was tested in the wind tunnel and combined with simulation to obtain the best combination of test parameters.In summary,this paper combines entomology,aerodynamics and mechanical design from the bionics technology,while using wind tunnel testing techniques.According to the deployable hind wing structures and flight characteristics of the migratory beetle,a bionic deployable wing for flapping wing MAV was designed,and its feasibility was verified by simulation and wind tunnel test.This paper can provide theoretical basis and technical reference for further development of bionic flapping wing MAV design.