Determination of Performance and Stability Characteristics from Dynamic Manoeuvres with a Transport Aircraft Using Parameter Identification Techniques,
NATIONAL AEROSPACE LAB AMSTERDAM (NETHERLANDS)
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A flight test program was executed with the Fokker F28 transport aircraft to investigate whether it is possible to determine performance and stability characteristics from dynamic manoeuvres using parameter identification techniques, with sufficient accuracy for certification purposes. A research moving base flight simulator, programmed with the F28 aerodynamic model derived from conventional flight tests and wind-tunnel data, was used to select an optimal set of manoeuvres from which the desired characteristics could be determined with a satisfactory degree of accuracy. Flight test data was analysed, using the so-called Two-Step method developed in The Netherlands. This method starts by reconstructing the aircraft flight path as the first step. The second step is the calculation of all aerodynamic coefficients using straightforward regression analysis techniques. The advantage of this method over the more often used maximum likelihood estimation methods is that a large number of alternative non-linear aerodynamic models can be investigated in a short time using an interactive program. The flight test results are compared with results derived from conventional test programmes. From this comparison it is clear that the above-mentioned goal has been reached.