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Study on Mechanism and System Identification Modeling of Unmanned Tilt-rotor Aircraft

Author: FuQingTao
Tutor: SongYanGuo
School: Nanjing University of Aeronautics and Astronautics
Course: Aircraft design
Keywords: Tiltrotor aircraft Flight Dynamics System Identification State subspace Error prediction method
CLC: V212.4
Type: Master's thesis
Year: 2011
Downloads: 60
Quote: 1
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Abstract


Tiltrotor aircraft is a new type of aircraft , which has the common features of helicopters and fixed-wing aircraft , both off and land vertically like a helicopter airplane mode , but also to achieve high-speed forward flight , precisely because of their excellent properties , leading itself complex structure of technical difficulties . Tiltrotor aircraft flight dynamics model of a tiltrotor aircraft , helicopter mode and airplane mode conversion based on the study of the control system . In this paper, a certain type of unmanned tiltrotor aircraft mechanism modeling and system identification modeling . Mechanism method first , to establish the model of the mechanism for the aircraft highly nonlinear and complex dynamics , and extended this model can also be applied to the helicopter ; then created nonlinear flight dynamics learning model based on small perturbation assumptions of the model in the line near the equilibrium point , tiltrotor aircraft the small perturbations line flight dynamics model ; then to establish a general-purpose simulation model rotor aircraft , and the model is verified correctness ; Finally, a mechanism model the small perturbations line model as the model set to be identified , system identification modeling , using state subspace methods to obtain the initial model , and then using the prediction error method to obtain the optimal model , through simulation the successful identification tiltrotor aircraft flight dynamics model .

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CLC: > Aviation, aerospace > Aviation > Basic theory and experiments > Flight Mechanics > Helicopters, rotorcraft flight mechanics
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