||In the modernized technology, the research of aircraft has developed from a fixed wing to a rotary wing, which imitates the flapping wings of natural creatures. In the past 30 years, more and more research teams and university organizations have involved in this research area.|
This thesis is to investigate the flight mechanism and aerodynamic performance of the bird and insect by selecting the mechanism that is able to rotate and flap from the special flight mechanism; objectives are set by adapting engineering design, and five-bar linkage mechanism is proposed to achieve rotary and flapping motion. Dimensional synthesis and kinematics analysis are analyzed by the adaptation of vector loop method; after the optimization of the measurement, the average error of the angle of rotation 10.3° will be obtained. Furthermore the mechanical errors caused by the linkage of revolute joints between the mechanisms are analyzed while the largest error of 55(μm) of the displacement output and the largest error of 0.89° of the angular displacement output will be obtained. To ensure the stability, the semi-circle, notch, dovetail slot, and dovetail slider are respectively adapted between two sliding surfaces of the mechanical, and bearings are attached on rotary shafts as the final mechanism design. Through the mechanical analysis to evaluate the selections of the motors and to investigate the effect that caused by the friction towards the input torque to achieve the results of the flapping frequency that is within 15Hz, and the frictional effect that is not more than 20%. As the higher the flapping frequency gets, the larger the frictional effect will become. In the end, the improvement of the dynamic equilibrium will be made, as the shaking forces in the direction of x and y are improved 44% and 30% respectively, the new model of the rotary flapping mechanism will be proposed.