| The landing gear is an important load-bearing and handling-characteristics part of aircraft, it carries out an extremely important of aircraft taking off and landing process, and the shock absorber performance is a key measure of the landing gear system design successful whether or not. The full-body landing simulation of the self-designed magnetorheological(MR)damper in aircraft landing gear was studied, to test it’s damping designed performance.Firstly, based on the analysis of the working principle of MR damper, theoretical model of MR damper was established; then using dynamics theory, considering the body flexible the dynamics equations and the landing gear system model were established; based on landing gear drop shock test theory, the simulation test parameters were calculated.Secondly, based on a certain type of aircraft physical prototype and MR damper, aircraft rigid model and flexible model of MR damper landing gear were established by ADAMS multi-body dynamics software; according to the fuzzy control theory, a MR damper landing gear fuzzy controller was designed, then the fuzzy control sub-module and control system of MR semi-active landing gear was built in MATLAB/Simulink.Finally, based on ADAMS and MATLAB software, the full-body drop simulation was real-time controlled respectively under rigid model and flexible model cases, and the co-simulation of mechanical system and control system was completed. From the aircraft body acceleration, velocity, displacement, tire vertical load and shock absorber efficiency,rigid model and flexible model full-body landing simulation results were compared, as well as,passive control and MR semi-active control landing simulation results were compared. The results show that the flexible aircraft model has better precision closer to the actual results,while landing MR damper can effectively reduce the fuselage vibration and shock loads,thereby enhancing the landing gear system security and comfort. |
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