AN INVESTIGATION OF HANDLEY PAGE JETSTREAM HANDLING DURING LANDING - NONLINEAR ASPECTS

摘要

Handley Page Jetstream G-NFLC is heavilyrnused as an airborne laboratory platform. Inrnsome circumstances, the aeroplane may bernprone to pilot involved oscillations in pitchrnduring the flare. In a previous study, linearrnmathematical models of the short periodrndynamics (estimated from flight data) werernassessed against the Gibson dropback andrnphase rate criteria. In both cases, the aircraftrnresponse was judged to be marginallyrnsatisfactory. In this investigation, thern(nonlinear) effect of inceptor dead band is takenrninto account. The stability of the combinedrnlinear and nonlinear elements is assessed usingrnthe Nyquist criterion, where it is shown that arnpilot involved oscillation is now a distinctrnpossibility, particularly at aft centre of gravityrnlocations.