Landing Efficiency of Aircraft Landing Gear System with MR Dampers

Inhalt:
In this work, a 6-DoF aircraft model which has a controllable landing gear system with magnetorheological (MR) dampers is derived to analyze the landing performance with the two controllers. MR dampers are mathematically modeled to realize high damping force suitable for landing gear performance based on the specifications of Beechcraft Baron B55 (passive oleo-strut type) damper. After deriving both the kinematic and dynamic equations of the aircraft model considering the heave, roll, and pitch motions, the landing efficiency is evaluated through the landing motion simulations which are performed on the basis of the model equations. In order to investigate the landing efficiency, two different control logics for MR dampers are designed; the skyhook controller and the modified skyhook controller integrating with the semi-active bouncing control (SBC) method which is robust to the roll motion. Using these controllers, the landing motions are evaluated in the time domain and the landing efficiencies with and without controllers are evaluated and compared.