Design And Research Of Composite Powered Unmanned Airship

Conventional four-rotor power is provided by the rotation of the rotor to provide the aircraft in the vertical direction of the lift and the direction of the forward tension,through the four different speed of the rotor to achieve a variety of maneuvering action.However,due to the capacity of the battery at this stage,resulting in four-rotor flight time is short.At present,the outstanding four-rotor is not more than an hour in actual flight,which is detrimental to the long mission of the aircraft.Now the use of four-rotor have seen more and more in aerial photography,aerial survey,plant protection and other aspects.This is due to the stability of the four-rotor,operational superiority and in flight control is also more mature.In order to better promote the use of four-rotor,aircraft need to be strengthened in terms of flight time.The currently available method is combination with other types of aircraft,such as aircraft associated with fixed and airships.With the airship to re-enter the people's vision,the excellent performance of the airship in the long flight was seen.Therefore,this paper presents a airship combined with four-rotor which called compsited power unmanned airship.Both to ensure a good amount of control performance and stability of the performance,but also in terms of navigation more conventional four rotor has improved significantly.The compound powered unmanned airship is a four-rotor and airbag combination of aircraft,which consists of four rotor,the use of four-wing wing arm inserted in the way on the balloon combination.In both to ensure the normal operation of the four rotor system,and ensure the overall airbag air tightness under the premise of the advantages of the two aircraft together.The four-rotor system is used to control the overall stability and maneuvering changes,and the airbag is used to provide most of the lift,reducing the energy consumption of the four-rotor system in the vertical direction.In this paper,the overall design and detailed structural design of the composite powered unmanned airship are carried out,and the structure and material of the prototype are designed and selected.The airbag structure was analyzed by PATRAN &NASTRAN software,It is concluded that the "X" flight mode is smaller than the "cross" type flight mode,and the maximum stress at the connection between the airbag and the wing arm increases with the increase of the flight angle.Then,the three-dimensional calculation model of the aircraft was established by using CATIA software,and theshape data was introduced into ICEM software.The aerodynamic grid partition and boundary condition were set up.Finally,the pneumatic calculation and analysis were carried out by STAR CCM+ software.This paper mainly analyzes the aerodynamic performance of the composite powered unmanned aerial vehicle with the conventional four-rotor in the roll fuselage.The energy consumption of the two aircraft under the same range of the same load is analyzed and the total energy consumption of the two aircraft is selected at a specific cruising speed.According to the numerical simulation results: the composite power unmanned airship is more efficient than the conventional four rotor,and can realize long flight.Which provides a reference for the optimization and aerodynamic analysis of the combination of rotor and airbag.