Study On Design And Lift Test Of Eight Blades Half-Rotating Mechanism

The flapping-wing air vehicle has become a hot issue currently of Chinese and foreign scientists,which has the advantages of good mobility,low space requirement,high efficiency.But the large-scale flapping-wing air vehicle is difficult to achieve because of the unbalanced inertia force generated from asymmetrical swing of the blades.Based on this,the eight blades half-rotating mechanism is proposed in this paper.It uses blades’ rotation instead of wings’ swing,so the unbalanced inertia force generated by the asymmetric swing of the blade is solved.The mechanism is designed and the lift test is studied,which has theoretical significance and practical value in improving the performance of flapping wing aircraft.The constitution and working principle of the eight blades half-rotating mechanism is determined,and the control method of flight condition is analyzed.Then the eight blades half-rotating mechanism mathematical model is established,and the structural parameters of the blade are determined.The theoretical lift force is calculated under different speeds.According to the overall structure of the eight blades half-rotating mechanism,every part of the mechanism is analyzed in detail.The parametric model of every part is established by UG.The 3D model of the eight blades half-rotating mechanism is set up,and the manufacturing and assembling of the prototype is completed.The prototype is provided for lift experiment.According to the design requirements of lift test device,the two-component lift test device and the suspension lift test device are analyzed and compared.The latter is selected as the experimental device,then the composition and the work principle of the device are analyzed,and the mathematical model of the device is established.The performance parameters of the test device are determined by vibration test,and dynamic analysis of the suspended lift test device is carried out by ADAMS.The test principle and the feasibility of the device are verified.The lifting scheme of the eight blades half-rotating mechanism and the composition of the lift test system are determined.After lift experiment,the experimental data is handled with MATLAB,then the lift curve under the same initial position and different speeds areobtained.The experimental results and the theoretical results are compared,and the reason for the gap between them is analyzed.The relationship between the lifting speed and the lift coefficient CL of the eight blades half-rotating mechanism is obtained,which provides foundation for the theoretical calculation.