Heat and Wear of Aircraft Under carriage Wheels
Date
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Aircraft landing gears support the aircraft during ground operations, including take-off,
landing impact, taxiing, gate handling and maintenance. Mostly for reasons of minimum
mass and ground clearance, landing gears are slender structures which exhibit a
considerable dynamic response to ground load excitation. As the landing gear is one of the
few systems on the aircraft without redundancies, the knowledge of landing gear dynamics
is crucial for aircraft design and aircraft safety. For the investigation of elastic bending of
the landing gear shock absorber of an aircraft under dynamic loads upon landing and
subsequent braking during roll out, an MBS-based model of the landing gear is introduced.
To separate effects of the elastic bending of the main landing gear the fuselage is
considered rigid. After performing a flare with subsequent landing, the aircraft is stopped
by means of an antiskid system. For comparison, an analytical–numerical study of a finiteelement model of the main landing gear shock strut components is done for simple static
and dynamic loads considering Bernoulli’s hypothesis. Simulation of a rough-landing
manoeuvre reveals that vibrations due to the elastic properties of the shock absorber not
only increase loads on the components but significantly affect the braking process as well.
Keywords: elastic shock absorber, landing gear model