Robust adaptive backstepping neural networks control for spacecraft rendezvous and docking with input saturation

2016 ◽  
Vol 62 ◽  
pp. 249-257 ◽  
Author(s):  
Kewei Xia ◽  
Wei Huo
Keyword(s):  
Neural Networks ◽  
Input Saturation ◽  
Adaptive Backstepping ◽  
Robust Adaptive ◽  
Rendezvous And Docking

scholarly journals Nonlinear Constrained Adaptive Backstepping Tracking Control for a Hypersonic Vehicle with Uncertainty

2015 ◽  
Vol 2015 ◽  
pp. 1-16 ◽  
Author(s):  
Qin Zou ◽  
Fang Wang ◽  
Qun Zong
Keyword(s):  
Controller Design ◽  
Input Saturation ◽  
Hypersonic Vehicle ◽  
Backstepping Control ◽  
Robust Adaptive Control ◽  
Adaptive Backstepping ◽  
Control Scheme ◽  
Auxiliary Signal ◽  
Control Saturation ◽  
Robust Adaptive

The control problem of a flexible hypersonic vehicle is presented, where input saturation and aerodynamic uncertainty are considered. A control-oriented model including aerodynamic uncertainty is derived for simple controller design due to the nonlinearity and complexity of hypersonic vehicle model. Then it is separated into velocity subsystem and altitude subsystem. On the basis of the integration of robust adaptive control and backstepping technique, respective controller is designed for each subsystem, where an auxiliary signal provided by an additional dynamic system is used to compensate for the control saturation effect. Then to deal with the “explosion of terms” problem inherent in backstepping control, a novel first-order filter is proposed. Simulation results are included to demonstrate the effectiveness of the adaptive backstepping control scheme.

Robust Adaptive Synchronization of Chaotic Systems With Nonsymmetric Input Saturation Constraints

2017 ◽  
Vol 13 (1) ◽  
Author(s):  
Samaneh Mohammadpour ◽  
Tahereh Binazadeh
Keyword(s):  
Chaotic Systems ◽  
Sliding Mode ◽  
Input Saturation ◽  
Adaptive Synchronization ◽  
Adaptive Sliding Mode Controller ◽  
Robust Synchronization ◽  
Effective Performance ◽  
Saturation Constraints ◽  
Robust Adaptive ◽  
Input Saturation Constraints

This paper considers the robust synchronization of chaotic systems in the presence of nonsymmetric input saturation constraints. The synchronization happens between two nonlinear master and slave systems in the face of model uncertainties and external disturbances. A new adaptive sliding mode controller is designed in a way that the robust synchronization occurs. In this regard, a theorem is proposed, and according to the Lyapunov approach the adaptation laws are derived, and it is proved that the synchronization error converges to zero despite of the uncertain terms in master and slave systems and nonsymmetric input saturation constraints. Finally, the proposed method is applied on chaotic gyro systems to show its applicability. Computer simulations verify the theoretical results and also show the effective performance of the proposed controller.

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