Improved sliding mode compound control of aircraft EMA servo system considering non-matching disturbances
CHANG Yu-fang
ZHANG Chuang-chuang
GAO Peng
YAN Huai-cheng
HUANG Wen-cong
Abstract：Aiming at the problem of non-matching disturbances common in the aircraft electro-mechanical actuator(EMA)servo system,which will reduce the tracking accuracy of the system state,a composite control method for improved non-singular global terminal sliding mode and non-matching disturbances estimation feedback compensation based on cascaded extended state observers is proposed.Firstly,an optimization mathematical model of the system was established based on the precise definition of non-matching disturbances,and a cascade extended state observer is designed to estimate non-matching and matching disturbances in real-time.Secondly,an improved non-singular global terminal sliding surface and control law are designed based on the disturbance estimation information so that the system braking pressure can be accurately tracked.Its expected output value.Thirdly,through the non-matching disturbance estimation feedback compensation,the tracking error of the system rotor angular velocity output is offset,and the negative impact of the non-matching disturbance on the system state is suppressed;Finally,through simulation analysis under three types of expected output braking pressures,it is verified that the composite control method of the aircraft EMA servo system proposed in this article can effectively deal with the influence of non-matching disturbances,allowing the system state to achieve faster convergence speed and higher tracking accuracy.
Keywords：electro-mechanical actuatornon-matching disturbancescascaded extended state observers:non-singular global terminal sliding mode
Publication Date：2025-07-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 1407-1416 )