Research And Realization Of Calculation Method For Obstacle-Climbing Performance Of Civil Aircraft In Take-off And Departure

Obstacle clearance performance analysis during takeoff and departure is an important guarantee for flight safety and economy.Boeing and Airbus softwares can provide aircraft departure performance parameters,but the specific algorithm has not been announced.In the context of my country’s research and development of domestic civil aircraft,it is urgent to study and master the core algorithm of take-off obstacle clearance performance calculation.Aiming at the problem of aircraft takeoff and departure,the numerical integral calculation model of aircraft takeoff process,the vertical section calculation model and horizontal section calculation model of aircraft takeoff and departure were established.By Comparing the refined take-off model of the aircraft taking into account the turning rate of the aircraft with the calculation results of the Boeing software BPS,the deviation for a calculation model of the aircraft’s takeoff under the same conditions was 4%.Then,based on the Boeing software BCOP climb vertical profile,the calculation mechanism of 5 modes including constant indicated airspeed climb,constant mach number climb,constant climb rate climb,and constant climb gradient climb were analyzed,and the calculation deviation was within2.5%;then,according to the relative relationship between points,lines and arcs such as P-P,ρ-θ,θ-θ,etc.,the calculation model of the aircraft departure horizontal profile was constructed,and the airport standard instrument departure chart of the Qingdao/Liuting was taken as an example to simulate,and the simulated horizontal trajectory was basically the same as that of the BCOP software.Then,by combining the models of the horizontal section and the vertical section of the aircraft’s departure,integrating which into a 3D trajectory calculation model of the aircraft’s takeoff and departure,which was basically consistent with the calculation results of BCOP under the same conditions.Finally,aiming at the problem of safe obstacle clearance for aircraft departure,the limit weight of the obstacle clearance was compared with the data calculated by BPS software,and the BCOP software was used to assist the verification.The research shows that the built aircraft takeoff and departure vertical section,horizontal section and 3D model combining the vertical model and the horizontal model are accurate and effective.The reliability of the aircraft takeoff and departure obstacle clearance model is well,which can be used as a reference for scientific research institutions and can be used to analyze the obstacle clearance performance parameters of domestic civil aircraft.