System Design And Kinematics Research Of Bionic Flapping Wing Aircraft

In recent years,the application of unmanned aerial vehicles in the military and civil fields has continued to increase.A flapping-wing aircraft is a new type of aircraft that generates lift and thrust through flapping wings to imitate flying creatures in nature.It has the characteristics of low noise,high concealment,stable flight,flexible maneuverability,and high propulsion efficiency.Therefore,the study of flapping-wing aircraft is extremely important for the field of unmanned aerial vehicles in the future.Based on the principle of bionics,the flight mechanism of flying creatures in the natural world is studied in this paper.With the goshawk as the bionic design object,system design,aerodynamics research,kinematics and dynamics analysis,prototype strength analysis and prototype design of the bionic flapping-wing aircraft are completed.On this basis,the prototype is selected,processed and tested for materials and components.The specific research content is as follows:Analyze the wing structure and flight mode of birds and insects in natural flying creatures,and explore the mechanism of aerodynamic force generation.Summarize the aerodynamic modeling mechanism of existing flapping-wing aircraft based on the leaf element theory,determine the bionic target and parameter requirements based on the bird flight mechanism,and preliminarily estimate the bionic size parameters based on the scale law formula.Design and model the wing and tail of the bionic flapping-wing aircraft,use the XFlow computational fluid dynamics simulation platform to study the influence of wing shape,wing surface shape,and span length on aerodynamic forces,consider material resources and wing gravity,select Wing structure with optimal aerodynamic characteristics.Combining five common tails,analyze the aircraft’s horizontal,pitch,and yaw motion modes,and select the appropriate aircraft tail according to actual flight requirements.Establish the coupling analysis of the wing flapping frequency,flapping amplitude,up-down flapping time ratio and other kinematic parameters of the bionic flapping-wing aircraft with the wing geometric parameters.The results show that the reasonable coupling setting of the motion parameters is beneficial to the generation of aerodynamic force,and the research results and analysis provide useful guidance for the system design of the flapping-wing aircraft.Based on the results of aerodynamic analysis,the drive scheme and flapping mechanism of the bionic flapping-wing aircraft are selected,and the transmission mechanism and the tail mechanism are designed.Carry on parameter definition and kinematics modeling to the flapping mechanism,and design the size parameters of the mechanism.The kinematics and dynamics simulation the bionic flapping-wing aircraft are analyzed by the ADAMS multi-body dynamics simulation platform.The results show that the designed flapping mechanism meets the motion requirements,and the simulation analysis results will provide guidance for the device selection,mechanism optimization,structural strength and prototype development of the bionic flapping-wing aircraft.Determine the components,materials,processing drawings and technology of the bionic flapping-wing aircraft,and carry out the development and testing of the prototype.In order to verify the strength of the flapping-wing aircraft wing,a finite element analysis was performed on the wing veins of the prototype.The results show that the improved bionic wing veins have sufficient structural strength and controllable deformation.Based on the wireless control scheme,a flapping-wing aircraft control system was built to complete the flight test of the prototype.