On the modeling of light aircraft landing gears
Résumé
Light aircrafts are designed to be used in both developed and undeveloped areas of a country. Hard landing
conditions such as shocks and rebounds may occur. In this context, a good, efficient, robust and easy to maintain
landing gear is vital. Its main role is to dissipate the energy of the impact. The aim of this work is to study an
innovative light aircraft landing gear equipped with a damper. The study includes comparing its dissipation
performance with two traditional light aircraft landing gears: a classical flat spring landing gear and a landing gear
with Sandow cords. These systems’ modeling is carried out through three steps. Firstly, Bush tire is modeled with
finite elements considering tire geometry and material specificities. Secondly, combined finite elements with
structural elements are used to model the different landing gear systems. Thus, stress, deformation and energy
within landing gears components could be obtained. Finally, aircraft rolling simulations are conducted. Systems’
transient responses while rolling over ramp are evaluated, as well as the efforts and rebound displacements
transmitted to the aircraft. A dissipation efficiency comparative study between the landing gears is conducted. In
addition, the influence of simulation’ conditions such as inflation pressure, rolling velocity or runway flatness is
investigated.
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