Structural Design And Simulation Of Human-Powered Bird-Inspired Aircraft

The human-powered bird-inspired aircraft is a type of human-powered aircraft designed to simulate the flight mechanism of birds.Due to its unique driving method,the human-powered bird-inspired aircraft has broad application prospects in the development of amusement projects.The prototype of a traditional human-powered aircraft has three flight modes: fixed-wing,rotary-wing,and flapping-wing.The flapping-wing flight mode has the characteristics of generating lift and thrust at the same time,but it is difficult for human-driven flapping wings to achieve complex movements.To solve this problem,the human-powered bird-inspired aircraft is designed in this dissertation,the hybrid wing combined with a flapping wing and a fixed wing,the lightweight synchronous transmission mechanism suitable for long-distance transmission,and the mechanism that can realize synchronous flapping of left and right flapping wings and independent twisting flapping wings are proposed,the structural design of the whole machine is completed.Firstly,according to the design goal of the human-powered bird-inspired aircraft,the design requirements and overall plan of the aircraft are proposed,and the aircraft is divided into four parts: hybrid wing,transmission mechanism,flapping wing mechanism,and fuselage.The hybrid wing structure plan,the flapping wing mechanism plan that can realize the synchronous flapping and independent twisting of the left and right flapping wings,and the transmission mechanism plan that can realize the synchronous flapping of the flapping wing mechanism are determined.The composition and working principle of each mechanism are discussed.Then,on the basis of the determined organization scheme,the determination of the aircraft parameters is completed.The structural parameters of the flapping wing based on the flight biological scaling laws,and the structural parameters of the fixed wing according to the non-interference condition of the hybrid wing are determined,the kinematics analysis and structural parameter determination of the transmission mechanism and the flapping wing mechanism is completed,and the kinematics simulation analysis of the transmission mechanism and the flapping wing mechanism is completed based on ADAMS to verify the correctness of the kinematics model.The lift estimation model of the hybrid wing is established to estimate the lift of the hybrid wing.After that,the structural design of the human-powered bird-inspired aircraft is completed.Respectively,the detailed structural design of the hybrid wing,transmission mechanism,flapping wing mechanism and the fuselage of the human-powered bird-inspired aircraft are completed,the engineering drawing of the whole aircraft has been drawn and the assembly of the 3D model of the whole aircraft are completed in SLOIDWORKS,the interference in the three-dimensional model is eliminated,and the virtual prototype of a human-powered bird-inspired aircraft with a reasonable structure is obtained.Finally,the structural strength,stiffness and modal analysis of the fuselage are completed.Firstly,the force of the working mechanism in the vertical retarding attitude is analyzed,the relationship between the driving force and the flapping wing load are established,and the maximum working load of the working mechanism is determined according to the maximum driving force,after that,the strength analysis of the aircraft fuselage based on WORKBENCH is completed,the strength analysis model of the fuselage under the maximum working load is established,according to the analysis results,the stiffness and strength of the fuselage under the maximum working load can meet the requirements.Finally the modal analysis of the fuselage is completed based on WORKBENCH,and the low-order frequency and mode shape of the constraint mode of the fuselage are obtained.According to the results of the modal analysis,the fuselage will not resonate during operation.