21st Congress of International Council of the Aeronautical Sciences, Melbourne, Australia, 13-18 September, 1998
Paper ICAS-98-7.5.1

ANALYSIS OF AIRCRAFT STOCHASTIC MOTION AFTER LOSING THE CONTROL

Bathory Z.
Technical University of Budapest, Hungary

Keywords: stochastic, aircraft, control

For increasing the size of new aircraft and for increasing the timeablebility (flying in poor weather the modem future aircraft should have a higher flight safety. Therefore. The investigation of the unconventional flights e.g. flights out of the normal flight and load envelopes is a very actual practical and theoretical problem. The lecture investigates the aircraft real motion after loosing the conventional control. The free flying model of aircraft is used in the practical investigation. The motion of airplane model with simulation of loosing the control is recorded on video. The film is digitalized and the flight path is . Reconstructed on the basis of special marks made on the flying model. The Fokker-Planc equations are used during the description of the real motion of aircraft. The entire process of aircraft motion is analyzed as the realizations of time series parameters and set up a hypothesis on the approximation of diffusion coefficient functions. So, the statistical data of aircraft motion after loosing the control is obtained by solution of diffusion equations. The results are demonstrated in from transition probability matrix functions describing the changes in flight characteristics of airplane after loosing its conventional control. The results of investigations can be applied to the aircraft accident investigations and crash analysis.

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