Abstract
The main landing gear walk is a longitudinal fore and aft movement of the strut caused by the brake system, and usually the vibration frequency does not exceed 10Hz. Gear walk is not only detrimental to the structural safety of the landing gear but also impairs the aircraft braking system's efficiency, so this vibration must be suppressed. Conventional anti-skid braking system (ABS) cannot recognize the friction characteristics of the tires and the road, so the tire-road friction changes drastically, which is the direct reason for gear walk. To address this problem, this paper first proposes a runway identification method to determine the optimal slip ratio for different runways, thereby achieving efficient anti-skid control and avoiding drastic changes in tire-road friction. A common anti-skid braking algorithm used in aircraft today is the pressure-bias modulation (PBM) algorithm, which is a rule-based deceleration-rate type of anti-skid algorithm. To solve the problem of landing gear vibration caused by unstable brake pressure of PBM, this paper proposes a slip-ratio based antiskid control method based on the super twist algorithm (STA). We constructed a simulation model in MATLAB/Simulink and conducted simulation tests, and the simulation results proved that the gear walking suppression method is effective.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
