Research On Integrated Propeller-Engine-Aircraft Model And Control During Take-off Process

Due to the effect of the propeller, the turboprop aircraft has advantage of short takeoff and landing distance. Many kinds of turboprop aircrafts can take off and land successfully on aircraft carrier or warship. In order to adapt to the limited runway on carrier or warship, it is significant to study the integrated flight and propulsion control system to achieve the shortest takeoff distance, which needs the development of an integrated turboprop takeoff model. This thesis aims at the research on the integrated Propeller-Engine-Aircraft model and control during take-off process.Firstly, propeller models are established based on strip theory and lifting surface theory. A method to calculate the propeller performance which occurs in the ground rig test is presented. And the iterative algorithm about the propeller downwash angle is improved. Secondly, wing models are established based on CFD software and lifting line theory. A novel decoupling parameter is proposed to replace lifting line model with a simplified fitting model which has the advantage of high accuracy and fast calculation speed. VC6.0 and MATLAB hybrid programming is used to realize the real-time calculation of the fitting model. Thirdly, fitting model coupled with propeller model based on strip theory is used to predict the propeller-wing interaction. Finally, a real-time integrated turboprop aircraft takeoff model in three dimensions is built based on three sub models of engine, aircraft and propeller-wing interaction. Simulation results demonstrate that the propeller-wing interaction has a significant impact on the takeoff performance of the turboprop aircraft.In order to realize the shortest distance of takeoff run, three control plans are proposed, i.e. the maximum thrust control plan; the constant power control plan and the constant propeller blade angle control plan. The comparison among these three control plans shows that the control effect of the maximum thrust control plan is better than those of the two other. A controller is designed to solve the interaction between the two close loops. This controller can keep the propeller rotation speed constant while the propeller power changes and meet the requirement of the control accuracy.