| The mathematical models of every part of anti -skid braking system are built in the paper,which include the part of plane dynamics, undercarriage, controller of anti-skid braking, servo valve, hydraulic implement machine and the friction coefficient in runway, tire and the brake-wheel's rotation performance etc.All models are finished in SIMULINK of MATLAB.First,through the analysis of real performance of the undercarriage in the process of anti-skid braking and the undercarriage's dynamic character.The mathematical model of undercarriages is built,The research about braking is done in two facets,and one is symmetry braking,and the other is dissymmetry braking,including dissymmetry of left-right chief undercarriages dynamics and the interface of runway and wheels.Secondly,in view of nonlinear character and strong interference of outside,it is the first time in the paper that ANFIS(Adaptive Nerve Fuzzy inference System) is adopted in anti-skid braking system of airplanes.The algorithm combines merits of nerve network and fuzzy controller.It classifies by fuzzy algorithm but adjusts by nerve network.The slip velocity of wheel is the object controlled by anti-skid braking system.Finally, simulation of the anti-skid braking system in symmetry and in dissymmetry is made in the paper. The results indicate that the models in this paper are right and valid and that the simulation can imitate the real performance of airplane braking.The ANFIS can improve the aircraft braking performance greatly. |
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