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Thrust Vector Modeling of Engine and Maneuvering Control of Advanced Fighter Aircraft

Author: HuTianWen
Tutor: WuQingXian
School: Nanjing University of Aeronautics and Astronautics
Course: Weapons systems and the use of engineering
Keywords: Maneuver Engine Modeling Thrust Vectoring Nozzle UAS SMC with theExponential Approach Law Herbst Maneuver
CLC: V271.41
Type: Master's thesis
Year: 2013
Downloads: 16
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Abstract


With the improved agility, mobility of fighter aircraft and applications of the advanced jammingequipments, the defense penetration ability of fighters are greatly enhanced. Then, close-in air combatbecome an important form in the future war. However, the foundation of success in an aerial combat isthe post-stall maneuver ability of vehicle.A further research on the post-stall maneuver is proposed in this paper. By analyzing thecharacteristics of the post-stall maneuver, two basic systems, which are thrust vectoring engine andflight control system, are discussed. Then, this paper introduces the further research on thrust vectorengine modeling and flight control design.Firstly, the MIMO model for small deviation linear engine system is created with the analysis oncalculation codes and working principles of nonlinear engine model; baffled plate is adopted toestablish the thrust vectoring nozzle model; a series of engine models for difference attacking anglesare proposed with the detail analysis of the attacking-angle influence on engine model in the post stallmaneuver.Then, an advanced sliding mode control with unidirectional auxiliary surfaces (UAS SMC)strategy is discussed in this paper. Despite of the suppressed chattering phenomenon, the convergencespeed in this method is limited. Hence, an innovative algorithm which called UAS SMC with theexponential approach law is proposed here. Simulation results demonstrate the superior convergencespeed and the effectively suppressed chattering phenomenon of UAS SMC with the exponentialapproach law.With the detailed analysis for twelve state nonlinear equations of the flight vehicle, this paperhave designed nonlinear controllers respectively by adopting traditional sliding mode and UAS SMCwith the exponential approach law. The simulation result verifies the advanced abilities of UAS SMCwith the exponential approach law method.Finally, a three dimensional animation simulation of Herbst maneuver which takes OpenGLsoftware as the engine is shown in this paper. Hence, the combat method of fighter aircraft withpost-stall maneuver in close-in air combat the simulation is directly demonstrated.

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CLC: > Aviation, aerospace > Aviation > Various types of aircraft > Aircraft > Military aircraft ( fighter) > Fighter ( fighter )
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