Design And Optimization Of Insect-Like Flexible Wings Based On Structure And Aerodynamic Analysis

The research progress of bionics and the improvement of micro-electronic technology promote the researches of insect-like flapping-wing micro air vehicle(IFMAV).Compared with traditional rotor aircraft and fixed wing aircraft,IFMAV can be designed with smaller size,better maneuverability and better environmental adaptability.It is increasingly important in military and civil fields.As the core part of the lift and thrust,the design of insect-like flexible wing plays an important role in the development of IFMAV.Based on the research of bionics,the structure features of different insect wings were extracted to establish the finite element statics and dynamics analysis models,the common characteristics and the differences of several insect wings were compared.Take wasp wings as the bionic object,and use the fluid-structure interaction analysis and computational fluid dynamics method,the influences of geometric and flexible characteristics of the wings on aerodynamic force were analyzed.On the basis of it,the design and optimization method of flexible wings of IFMAV was put forward.The main contents of this dissertation include the following parts:1.Based on the study of insect flight bionics principle,the main structural characteristics of insect wings are extracted to establish the finite element models of wasp,butterfly,and housefly wings.The similarities and differences of the flexible characteristics and modal characteristics of different wings were compared by finite element statics and dynamics analysis models.2.The connections between geometric characteristics(aspect ratio,torsion center)and the dynamic models of wasp wings were established.By comparing the aerodynamic characteristics under different geometric features conditions,the effects of geometry on the aerodynamic forces were analyzed.3.The changes of flexible characteristics on dynamic models(trajectory,rigidity/flexibility of airfoil)were analyzed.The effects of these changes on the aerodynamic characteristics of the wings were analyzed by numerical simulations.4.Take the wasp wings as the bionic object and flexible characteristics as optimization goal,a design and optimization method of flexible wings of IFMAV was put forward.