This study demonstrates the feasibility and effectiveness of ER (electrorheological) and MR (magnetorheological) fluid-based landing gear systems on attenuating dynamic load and vibration due to the landing impact. First, the theoretical model for ER/MR shock struts, which are the main components of the landing gear system, is developed based on experimental data. With this theoretical model, the telescopic type landing gear system using the ER/MR shock struts is constructed and its governing equation is derived. Then, the robust sliding mode controller against parameter variations and external disturbances is designed and controlled performance of the ER/MR landing gear system is evaluated during touchdown of the aircraft.
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