Research On Identifying The Model Of Tilt-rotor Aircraft

Tilt-rotor aircraft is a new notional and structural aero craft between helicopter and airplane. It is a key problem for designing control system to carry out flight model transition between helicopter and airplane. A mathematical model is needed to design the flight control system. At present, there are two modeling ways; the first one is to establish the nonlinear differential equation by using the theory of aerodynamics and dynamics. The other is to construct the experimental model by using the technique of system identification, with the input/output data collected in testing.The paper adopts the second way to establish the mathematical model of tilt-rotor. The model is identified with three methods, which are RLS, UKF and NN. The paper is composed of three parts. A flight dynamic mathematical model is given basing on analyzing tilt-rotor characteristic. A pretreatment method of data process is introduced. A low pass finite impulse filter is designed. The three identification methods are applied to identify online tilt-rotor mathematical model. The result of simulation proves that the three methods be used to identify and build a mathematical model of tilt-rotor aircraft...