| As one of the most important part of multi-electric aircraft, electric braking system takes use of the EMA(Electro-Mechanical Actuation)braking frame instead of the original hydraulic piston braking frame, and the digital anti-skid braking controller instead of the analogous anti-skid braking controller. It has been proved that the efficiency of braking as well as the performance and security of aircraft could be greatly improved as for the proposed electric braking system.In this paper, the landing gear braking system of a certain type aircraft has been investigated as the research object. Furthermore, mathematic models of each component have been established via comprehensive analysis of the working principle,constitutionof structure and the performance of electric braking. Meanwhile, an improved research on impact factors of the braking system has been discussed, such as the dynamics and movement characteristics of aircraft, the dynamic characteristics of landing gear braking wheel as well as the characteristics of runway . On the basis of research on the electric actuator and the braking moment feedback, a mathematic model of the entire system has been proposed with concrete form of the structure and parameters of the electric actuator.Owing to the characteristics of electric braking system and the drawback of current control algorithm, a comprehensive simulation of the entire system has been implemented taking use of fuzzy intelligent control algorithm with the simulation software MATLAB/SIMULNIK. It has been proved that the proposed model of system could be valid, which could have given a perfect simulation of the dynamic process of braking. Meanwhile, it has been confirmed that the priority of electric braking system, especially with fuzzy control method. |
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