Flight Control And 3D Visual Simulation Of Morphing Aircraft

Morphing aircraft has become a research hotspot in the field of aircraft due to the advantage that it can change its structure and shape to adapt to the current mission and environment when facing different flying missions and flying environments.More and more countries and scholars have invested a lot of energy in it.When the shape of the morphing aircraft changes,its aerodynamic focus,wing area and other parameters will change accordingly,and the original control system will no longer be applicable.Therefore,it is necessary to design a reasonable and feasible control system to ensure the stable flight of the aircraft in the process of morphing.This paper takes the morphing aircraft with variable wingspan as the research object,and conducts research on the acquisition of aerodynamic parameters,the establishment of dynamic model,the design of control system and the construction of three-dimensional visual simulation system of the morphing aircraft in the process of variable wingspan.Firstly,the relationship between the wingspan change rate and the aerodynamic parameters of the aircraft is studied.The aerodynamic data of the morphing aircraft in the process of variable wingspan is obtained by Datcom software.And then the functional relationship between the aerodynamic parameters and wingspan change rate is established by using the data fitting method.Through analysis,it is concluded that the change of wingspan has a significant impact on the aerodynamic parameters of the morphing aircraft.Furthermore,the nonlinear model of the morphing aircraft in longitudinal motion is established.Secondly,the control system design of the morphing aircraft is studied.Based on linear parameter varying(LPV)system,a robust gain scheduling control strategy is proposed.Compared with other gain scheduling methods,it avoids the grid division problem that lacks theoretical support.Next,based on T-S fuzzy theory,a T-S fuzzy model of the morphing aircraft is established,and a T-S fuzzy controller is designed by using parallel distribution compensation principle.The simulation curve shows that the morphing aircraft can fly stably under the two controllers and has good flight performance.Furthermore,the control effect of the two controllers is compared and analyzed in detail.Finally,the problem of visual simulation of morphing aircraft is studied,and a set of three-dimensional visual simulation system of aircraft is designed.First,the geometric model of the morphing aircraft was established through AC3 D modeling software,and then a joint simulation was carried out using Simulink software and Flight Gear software to complete the visual simulation of the entire process of the morphing aircraft from take-off to the end of the morphing.The visual simulation results prove the feasibility of the stable flight control strategy of the morphing aircraft.