22nd Congress of International Council of the Aeronautical Sciences, Harrogate, UK, 28 August - 1st September, 2000
Paper ICAS 2000-6.9.2
AN IN-FLIGHT INVESTIGATION OF HANDLEY PAGE JETSTREAM HANDLING DURING LANDING - NON LINEAR ASPECTS
G. Mullen, F. Marodon
Cranfield University, UK
Keywords: jetstream, in-flight testing, handling, non-linear aspects
Handley Page Jetstream G-NFLC is heavily
used as an airborne laboratory platform. In
some circumstances, the aeroplane may be
prone to pilot involved oscillations in pitch
during the flare. In a previous study, linear
mathematical models of the short period
dynamics (estimated from flight data) were
assessed against the Gibson dropback and
phase rate criteria. In both cases, the aircraft
response was judged to be marginally
satisfactory. In this investigation, the
(nonlinear) effect of inceptor dead band is taken
into account. The stability of the combined
linear and nonlinear elements is assessed using
the Nyquist criterion, where it is shown that a
pilot involved oscillation is now a distinct
possibility,
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