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Aircraft anti-skid braking system Variable Structure Control

Author: DuChengLin
Tutor: ZhengYan
School: Northeastern University
Course: Control Theory and Control Engineering
Keywords: Aircraft brake Variable Structure Control Fuzzy Control Slip rate Robustness Buffeting
CLC: V227.7
Type: Master's thesis
Year: 2008
Downloads: 46
Quote: 2
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Abstract


As the plane toward the large tonnage , high speed and strong adaptability direction, the aircraft design put forward higher requirements. Anti-skid brake system as an important airborne aircraft , the aircraft 's takeoff and landing safety plays an important role . Especially military aircraft , often need to take off and land under complex conditions , the brake system is made ​​more demanding. Existing brake system used is based on the pressure side slip velocity error tone control method, there is poor mixing performance and low slip track shortcomings affecting the aircraft brake of safety and reliability . So the aircraft braking system control method is necessary to study , this paper studies a slip ratio based on variable structure control methods. Based on the aircraft anti-skid braking system working principle, structure and braking characteristics of the detailed analysis of the background of a certain type of aircraft , aircraft anti-skid braking systems considering the characteristics and physical properties of the components , based on the established mathematical brake system model . Thesis existing braking system efficiency is not high robustness bad problem, variable structure control method used in aircraft braking system study to be undertaken two effective methods to eliminate chattering . Thesis of uncertainty existing brake system strong mixing efficiency is not high on the runway of the problem, a fuzzy control and variable structure control of a combination of hybrid control strategy , using adaptive fuzzy controller sign function controller gain parameters to achieve braking systems for different optimum slip road fast track . In the theoretical analysis and design based on the use of MATLAB Simulink and Fuzzy Control Toolbox , combined with aircraft models for simulation. Simulation results show that the proposed control strategy can ensure the robustness of the control , but also can effectively weaken the chattering . Further validate the given control strategy to ensure a smooth braking under the premise of improving braking efficiency.

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