The Research Of Simulation On Stall Motion Characteristics Of A Certain Type Of Aircraft

The occurrence of aircraft stall will seriously affect the safe and stable flight of aircraft.In order to avoid the consequences of aircraft stall,on the one hand,prevent the aircraft from entering the stall,on the other hand,study how to achieve the stall recovery once the aircraft stall.The subject of aircraft stall and stall recovery is also a required subject for pilot flight training.In this paper,the stall motion characteristics of Cessna 172 aircraft are analyzed based on the computer simulation calculation and the simulation results,so as to lay a theoretical foundation for school flight training.The research work in this thesis is presented as the followings:(1)By using DATCOM software,various aerodynamic parameters such as basic aerodynamic forces and moments coefficients,static stability derivatives,dynamic stability derivatives,and aerodynamic variation data caused by the control surface of the Cessna 172 aircraft were calculated,and an aerodynamic model was set up.(2)The whole aircraft simulation model of aircraft six degrees of freedom movement was set up by using Simulink simulation software,and simulation calculations of aircraft six degrees of freedom movement was achieved.and three-dimensional visualization of the simulation process was achieved by connecting Flightgear software through Simulink.(3)Using an external pilot joystick and according to the training program,the motion state of aircraft stall and stall recovery with no power and with power were simulated under two different configurations,clean(flaps up)and specific(flaps down).And the stall motion characteristics of the aircraft was analyzed.The simulation results show that:(1)The aircraft is more likely to recover from stall when power on than when power off.After stall,it accelerates faster by lowering its head,recovers faster,and drops less altitude.(2)The stall characteristics of different configurations are also different.Specific configuration with flaps down slow down better than flaps up,but the aircraft has a smaller stall speed,a smaller Angle of attack,and a slower,more altitude loss than the clean configuration.