Improved Discrete-Time Sliding Mode Control for Lift Aircraft Based on Disturbance Observer
Lift-type aircraft has the characteristics of wide flight airspace,large range of speed changes,strong maneuverability requirements,which makes it a research focus in recent years.Aiming at difficulties of large uncertainty and strong external disturbance in the control model of lift-type aircraft,an improved discrete-time sliding mode variable structure control method based on disturbance observer is presented.Firstly,the discrete control model of the pitch channel is established.Secondly,an improved discrete-time sliding mode variable structure control system based on disturbance estimation is designed and its stability is proved.Thirdly,the influence of parameter selection on control system is analyzed,and the validity of control law is verified.Finally,the comparison with the traditional discrete sliding mode variable structure control system is carried out.The control system's simulation results demonstrate that,compared with the traditional discrete-time sliding mode control system,the proposed control system has higher control accuracy,stronger robustness,faster convergence to zero and less chattering.The proposed control law can effectively improve the flight quality,and can realize stable control for complex mission of lift-type aircraft.
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