Step-by-Step Longitudinal Aerodynamic Parameter Estimation Method for Fly-by-Wire Aircraft

The fidelity of wind tunnel data often cannot meet the fidelity requirement of engineering simulator. Based on parameter decoupling principle, a step-by-step longitudinal parameter estimation method and a flight test procedure aiming at fly-by-wire aircraft was designed to avoid the disturb to estimation coming from the flight control system and decrease the collinearity of the flight data, as a result, improving the fidelity of estimation. The result of the parameter estimation reveals the response of dynamic model established on the basis of estimated parameter satisfied the tolerance of CCAR60, which means it meets the fidelity requirement of the engineering simulator. It also proves that the longitudinal parameter estimation method and the flight test procedure are capable of gaining a sound estimation.