Aircraft Brake Controller Design Based On Fuzzy Control

With the change of the times,the advancement of science and technology,the development of the aviation industry is like a rising sun.The national defense cause has made great contributions.Aircraft occupies an important position in the aviation field,and the aircraft brake control system is the core component of aircraft on-board equipment.It is related to the safety and reliability of the aircraft during the flight and run-off phases.Therefore,its research has great significance.This thesis conducts research from three aspects of the aircraft brake controller model,control strategy,and related peripheral circuits.The main work is as followed:(1)Aircraft body modeling.The surrounding environment of an aircraft when landing and braking is complicated.It is affected by the airframe itself,the magnetic field around the airport,and crosswinds.In order to facilitate calculation and design,this article makes simple assumptions about the environment and airframe around the aircraft,Based on the assumptions,a three-degree-of-freedom model of the aircraft was built using the Matlab / Simulink software simulation platform,including aircraft dynamics models,wheel models,runway models,and brake device models.An overall model of an aircraft braking system.(2)Aircraft brake controller design.PID controller and fuzzy controller are designed according to PID control theory and fuzzy control theory.PID controller has the advantage of fast response although it is poor in robustness.Although fuzzy controller has a small control range,it has the advantage of not relying on mathematical models.This thesis proposes and designs a fuzzy controller combined with a PID control algorithm.This fuzzy controller combines the advantages of both,and has a fast response,strong robustness,and does not rely on the mathematical model of the braking system.At the same time,the controller simulates and analyzes the braking time,braking distance,wheel speed,and slip rate according to different runway conditions.(3)Peripheral circuit design for aircraft brake controller.Introduced and designed related peripheral circuits such as on-board power supply circuit,switch detection circuit,analog detection circuit and wheel speed signal detection circuit.Among them,in the wheel speed signal detection circuit,the cycle measurement method and frequency measurement method are introduced in detail.Principle and application range.At the same time,this thesis also introduces the sources of interference in the hardware circuit and anti-interference measures,which guarantees the stability and safety of the aircraft brake control system from the perspective of the hardware circuit.