Research On Simplified Design Method Of Half-rotating Mechanism And Implement Of Half-rotating Wing Prototype

With the development of aerodynamics and Electronic Science and Technology, research on bionic flapping-wing air vehicle had gradually become a hotspot. The principle was imitating swing type of bird's or insect's wing although the structure of all ornithopter were different, by which large inertial would generate and development in large scale were restricted. Half-Rotating Mechanism(HRM) was a new bionic mechanism,which could achieve flapping motion just by asymmetric rotating and avoid the shortcoming of high inertial force. However, traditional HRM had not been directly applied to bionic flying because complex transmission structure would lead it too heavy to fly. Under this background, simplified HRM would be explored and half-rotating-wing test prototype would be designed in this paper. Research results would provide theoretical reference for the application of HRM in bionic flight field.The moving rule of slider-crank mechanism should be analyzed firstly to find principle of simplest HRM. Problems of interference and uncertain motion appeared in process of evolution would be solved by adding a local constraint made of positioning slider and shaft with groove in simplest HRM. Kinematic analysis of half-rotating rod would be made to lay foundation for the design of components' parameters.The key design requirement of local constraint would be analysed in this paper. On this basis, shape and size of groove would be designed according to relative motion characteristics of positioning slider in groove of shaft. Kinematics simulation of simplified HRM based on UG software would be made and rationality of the design could be verified by analysing this mechanism's moving rule and half-rotating rod's velocity curve.Half-rotating-wing test prototype base on simplified HRM would be designed. Power source and control system should be selected firstly according to design principle of ornithopter. Secondly, design scheme of prototype should be determined and the structure and size of each part would be designed. Virtual prototype model would be established and all components would be manufactured and assembled. In the end, experiment would be done to observe running conditions.According to requirements of the lift experiment, dynamic balance of the prototype would be studied. Inertial force generated by the moving parts should be calculated and compared to find reason of unbalance. The method of forced vibration for single degree of freedom was used to analyse prototype's displacement variation in vertical direction. Finaly,counterweight would be optimized to eliminated unequal inertial force.On the other hand, dynamics simulation would be done by ADAMS software to analyzed its optimized result.