Triz--Based Conceptual Design Of Flapping-Wing Mechanism

Due to its advantages in terms of mobility, flexibility and aerodynamic performance, flapping-wing micro air vehicle (FMAV) has attracted much attention of researchers in recent years. Since flapping-wing mechanism of FMAV plays multiple functions such as vertical takeoff or landing, flexible turning and providing the lift force, its design and research are particularly important for the design of FMAV.In this thesis, TRIZ theory is applied to solving some problems arising from the conceptual design of flapping-wing mechanism.The main work of this thesis is as following:(1) Based on the classical formula for the calculate of lift force, the requirements for the design of wing are analyzed. With the method from TRIZ theory to solve the physical contradiction, the principle solution is obtained, which is combined further with the natural biological principles. The results are a variety of forms of kinematic planning for the wing, some of them have never been proposed before.(2) By the asymmetry principle of TRIZ theory, some discussions about the design of single-body wing are presented. While for the multi-body wing, the separation principle and the combination principle of TRIZ theory are employed to design the flapping-wing mechanism. Under the condition that one sliding motion is provided, the flapping-wing mechanisms can be constructed by the combination of two kinds of commonly encountered mechanism. Finally a mechanism is design to generate the assumed sliding motion.(3) For the conceptual design of flapping-wing mechanism, three kinds of factors involving the evaluation of complexity for a mechanism are analyzed. They are the numbers of combination, the types of combination, and morphology differences. The numbers of combination are divided into the numbers of kinematic pair and the numbers of links; the types of combination are divided into the types of kinematic pair and the types of links; the morphology differences are divided into the morphology differences among kinematic pair and the morphology differences among links. And a formula to evaluate the complexity of a mechanism is proposed, which will lay fundamentals for evaluation of the conceptual designs of flapping-wing mechanism.