| Bionic flapping-wing vehicle is a new kind of aircraft which imitates the behaviors of flying creatures in nature. Compared to traditional fixed wing aircraft, flapping-wing aircraft has its significant advantages: good maneuverability, good concealment, and the combination of lifting and thrusting. Its aerodynamics performance is excellent in low Reynolds number,and this kind of vehicle has a wide application prospect.Based on the observation of the birds’ behaviors, analysis of the wings’ movement, the mechanics of thrust and lift is conducted. The study of scaling rules is studied, which provides a theoretical basis for the following work.Aerodynamic configuration design is completed in CATIA, and ADAMS is used to set the movement of each part. With the driving mechanism, the symmetric flapping and the wings’ folding can be realized, which ensure a stable, safe and efficient fight from the view of the lifting, thrusting force production and the bionics.Based on the knowledge of fluid mechanics and common computational fluid dynamics(CFD) method, the Lattice Boltzmann method(LBM) is adapted to analyze the aerodynamic characteristics of flapping wing aircraft, and some parameters such as the flow velocity,flapping frequency and angle of attack, are analyzed; the difference between the single degree of freedom flapping and the composite one is analyzed, calculated and compared. With these work, the influence of these parameters for the aerodynamic performance is obtained.Some basic flight paths are discussed and analyzed in trajectory planning part, the parameters are calculated for the climbing process and the circular trajectory, which provide a simulation basis for the bionics flapping vehicle experiments. A simulation analyzing platform for the flapping vehicle is created using C#. The design, construction and functions definition of this platform is done. Analysis of this part provide a concept is provided for the data analysis, management and maintenance. |
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