Nonlinear Multi-point Modeling and Parameter Estimation of DO 28 Research Aircraft1

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Abstract

The modeling and nonlinear parameter estimation of the DORNIER DO 28 research aircraft is a part of the special research program SFB 212 of FRG. In this paper a nonlinear multi-point model with six-degree-of-freedom for DO 28 parameter estimation is presented.The model considers not only the high nonlinearity of aircraft motion, the characteristics of the propeller engine, of the wings and of the horizontal stabilizer, but also the wind disturbances by reconstruction of a quasi-stationary windfield, the improved algorithm for thrust calculation and the necessary corrections of the measurements through flight-test-data-compatibility-check. In order to overcome the nonidentifiability of parameters, a multi-stage identification method with intermediate models is proposed. Compared with one-point model, the multi-point model can describe more accurately the aircraft motion and is more suitable for aircraft parameter estimation.

Keywords

Modeling
identification
parameter estimation
nonlinear multi-point model
multistage identification method

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1

This investigation has been sponsored by Deutsche Forschungsgemeinschaft(DFG)within the SFB 212

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