Aircraft Wheels Brake Test Control System Design

The thesis is derived from the second stage of the technical improvement project of the Aircraft Tyre Wheel and Brake Test Dynamometer and focuses on building the model, controller design and simulation.Firstly, the thesis finished the design of the second stage technical improvement scheme, including selection of control system, connection of network and hardware configuration. Next, the math model of brake control system on pressure mode and resistance mode is obtained from the mechanism analysis and system identification. The classical PID controller is introduced and PID parameters and simulation results are presented. Considering the big scope and nonlinear characteristic of tyre wheel model parameters, combination controller of fuzzy and integral is here applied, and its fuzzy control rule table and fuzzy control lookup table are listed. Simulation of the combined controller of fuzzy and integral is carried out, and the result indicates that combined controller of fuzzy and integral is better than PID controller when comparing the control effect. Control software is written in C language. The semi-physical simulation system is setup to test the software. After that, the brake control system, the position control system, the load control system and the energy control system are combined together and inspected. The results shows that the established math model of brake control system is reasonable and the two controllers meet the demand of the whole system design.The thesis gives a useful method on system research which established a firm foundation for accomplishment of entire project.