Dynamics Simulation And Optimization Design Of Driving Mechanisms Of FMAV

Flapping-wing micro air vehicles (FMAV) are new conceptual air vehicles that mimic the flying modes of birds and insects. They have the advantages of small sizes, light weights, low costs, good stealth abilities and high maneuverability, and widely used in the fields of military and civil application. The study of bionics and aerodynamics indicates that the MAV which the characteristic dimension almost equate to bird or insect, the flapping flight is precede to fixed and rotatory MAV.FMAV with driving mechanisms of single-crank-and-double-rocker often tilt toward the left or the right and fall in the course of flight and this is mainly caused by the incomplete symmetry of the wings' movement. The object of study in the paper is FMAV that have driving mechanisms of single-crank and double-rocker. The paper combined aerodynamics achievement and the structure and movement of FMAV, and launched the work surrounding the goal of enhancing the symmetry of the wings' movement. The paper took modeling, simulation and optimization and so on as research method.The wings of FMAV are usually fixed in driving mechanisms' rockers, and the flapping flight is due to different driving mechanisms. In other words, different flights need different driving mechanisms. The driving mechanisms are the key component of FMAV, and they also demonstrate the figure action of flight. Considering the phenomena and the importance of driving mechanisms to FMAV, both mathematics models and simulation model of the driving mechanism were established. The curves of simulation were consistent with the curves of corresponding mathematical models, which verified both the mathematics models and the simulation model were correct. In order to enhance the movement symmetry of the single-crank-and-double-rocker driving mechanism, the comprehensive estimate function was constructed based on the mathematics models of the margins of the flapping-angle and the margins of angular speed. Then an optimization was carried on to the comprehensive estimate function using Hooke-Jeeves method under the restraint conditions of mechanics and bionics. The results of the optimization are helpful to both the same kinds of driving mechanisms and the other kinds of driving mechanisms.Based on the biological flight mechanism of birds and insects, a new mechanism of FMAV affected by forces was proposed in view of composition of forces, and the...