Design And Flight Characrteristics Research Of A Spherical Aircraft

With the advancement of technology and the growth in demand, small unmanned aircrafts have gradually become the focus of many research institutions and universities in the world. Small unmanned aircrafts have played a very important role both in military and civilian fields with its good maneuverability, simple structure, low cost and other characteristics. It can perform dangerous tasks such as low-altitude reconnaissance missions and hazard exploration. In this thesis, a new single-propeller spherical aircraft structure was designed and studied.Firstly the research and application status of all kinds of aircrafts at home and abroad was studied; and the respective advantages and disadvantages of the aircrafts were summarized. The purpose of the research was pointed out and the main contents of this thesis were described.Secondly the calculation formula of the net lift of the aircraft structure was drawn through theoretical calculation. The lift of the propeller was calculated with the help of the momentum theorem, also the resistance of the deflector flaps was studied. Finally the calculation formula of the net lift of the aircraft was derived. The dynamics of the aircraft both on the ground and in the sky was analyzed and modeled.Thirdly the statics analysis of structure was conducted, including simulation analysis in finite element analysis software and the theoretical calculation with the mechanics of materials. And the results of the two methods are basically consistent.Fourthly the fluid dynamics of the aircraft structure was analyzed. The isolated propeller, airframe structure, and the deflector structure’s forces in the flow field were numerically simulated by means of computational fluid dynamics analysis software.Finally, the aircraft’s structure program was proposed based on the design requirements and its movement principle was expounded in detail. Also the materials of every part were selected through analyses. At last tests were conducted and researched.