Publication: Aircraft taxi loads in unpaved surfaces
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Publication date
2016-06
Defense date
2016-07-08
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Abstract
Taxi is the intermediate phase found prior to takeoff or after landing. The aircraft normal
modes are excited given a determined runway roughness profile. As a matter of fact, the
coupling between the aircraft modes and the runway roughness profile contributes to the
amplification of the aircraft response and the appearance of dynamic loads. The latter is
intensified when taxiing on unpaved surfaces.
Characteristic aircraft elements and magnitudes sized during taxi include the wing down
bending moment and the loads acting on the landing gear, paying particular attention to the
loads exerted on the nose landing gear.
The experimental aircraft response is attempted to be reproduced by performing numerical
simulations. So far, numerical taxi loads were computed by following the requirements
established in Airworthiness Regulations specific to taxi:
Constant taxi speed
Symmetric cases
Constant external loads
Far from that, the experimental response gathered through a selection of taxi cases found at
different Airbus taxi campaigns is reproduced in this Bachelor Thesis by introducing a series
of modifications which represent what is indeed occurring during tests:
Variable taxi speed
Asymmetric cases
Variable external loads
The effect the braking coefficients have on the taxi problem, along with the nose landing gear
load relief phenomenon encountered in poor cohesive surfaces is also analysed.
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Keywords
Aeronautics, Aircraft taxi loads, Simulation