scholarly journals Disturbance Observer- Based Control For Nonlinear Systems

2014 ◽  
pp. 71-80
Keyword(s):  
Nonlinear Systems ◽  
Disturbance Observer

Anti-disturbance control based on disturbance observer for nonlinear systems with bounded disturbances

2018 ◽  
Vol 355 (12) ◽  
pp. 4916-4930 ◽  
Author(s):  
Huifeng Zhang ◽  
Xinjiang Wei ◽  
Hamid Reza Karimi ◽  
Jian Han
Keyword(s):  
Nonlinear Systems ◽  
Disturbance Observer ◽  
Bounded Disturbances

scholarly journals Disturbance observer-based control for nonlinear systems subject to mismatched disturbances with application to hypersonic flight vehicles

2017 ◽  
Vol 14 (2) ◽  
pp. 172988141769914 ◽  
Author(s):  
Yunling Li ◽  
Ming Zeng ◽  
Hao An ◽  
Changhong Wang
Keyword(s):  
Nonlinear Systems ◽  
Disturbance Observer ◽  
State Of The Art ◽  
Output Channel ◽  
Tracking Problem ◽  
Gain Matrix ◽  
Hypersonic Flight ◽  
Flight Vehicles ◽  
Nominal Performance ◽  
Mismatched Disturbances

For a class of multi-input multi-output nonlinear systems, a disturbance observer-based control is proposed to solve the tracking problem in the presence of mismatched disturbances. By designing a novel compensation gain matrix, the disturbances can be removed from the output channel completely as well as retaining the nominal performance. Compared with the state of the art, the gain matrix reduces to be constant; therefore, the complexity of the controller is simplified greatly. This method is applied to the control of hypersonic flight vehicles to demonstrate its effectiveness.

scholarly journals Nonsingular Fast Terminal Sliding Mode Tracking Control for a Class of Uncertain Nonlinear Systems

2019 ◽  
Vol 2019 ◽  
pp. 1-17
Author(s):  
Siyi Chen ◽  
Wei Liu ◽  
Huixian Huang
Keyword(s):  
Nonlinear Systems ◽  
Sliding Mode Control ◽  
Tracking Control ◽  
Disturbance Observer ◽  
Sliding Mode ◽  
Terminal Sliding Mode Control ◽  
Uncertain Nonlinear Systems ◽  
Terminal Sliding Mode ◽  
Rbf Network ◽  
Fast Terminal Sliding Mode

Aiming at the tracking control problem of a class of uncertain nonlinear systems, a nonsingular fast terminal sliding mode control scheme combining RBF network and disturbance observer is proposed. The sliding mode controller is designed by using nonsingular fast terminal sliding mode and second power reaching law to solve the problem of singularity and slow convergence in traditional terminal sliding mode control. By using the universal approximation of RBF network, the unknown nonlinear function of the system is approximated, and the disturbance observer is designed by using the hyperbolic tangent nonlinear tracking differentiator (TANH-NTD) to estimate the interference of the system and enhance the robustness of the system. The stability of the system is proved by the Lyapunov principle. The numerical simulation results show that the method can shorten the system arrival time, improve the tracking accuracy, and suppress the chattering phenomenon.

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