scholarly journals Dual-stage adaptive finite-time modified function projective multi-lag combined synchronization for multiple uncertain chaotic systems

2017 ◽  
Vol 15 (1) ◽  
pp. 1035-1047 ◽  
Author(s):  
Qiaoping Li ◽  
Sanyang Liu
Keyword(s):  
Finite Time ◽  
Chaotic Systems ◽  
Sliding Mode ◽  
Variable Structure Control ◽  
Variable Structure ◽  
New Method ◽  
Control Technique ◽  
Unknown Parameters ◽  
Structure Control ◽  
Dual Stage

Abstract In this paper, for multiple different chaotic systems with unknown bounded disturbances and fully unknown parameters, a more general synchronization method called modified function projective multi-lag combined synchronization is proposed. This new method covers almost all of the synchronization methods available. As an advantage of the new method, the drive system is a linear combination of multiple chaotic systems, which makes the signal hidden channels more abundant and the signal hidden methods more flexible. Based on the finite-time stability theory and the sliding mode variable structure control technique, a dual-stage adaptive variable structure control scheme is established to realize the finite-time synchronization and to tackle the parameters well. The detailed theoretical derivation and representative numerical simulation is put forward to demonstrate the correctness and effectiveness of the advanced scheme.

RLV Attitude Control System Design in Reentry Flight Phase

2011 ◽  
Vol 383-390 ◽  
pp. 5548-5552
Author(s):  
Peng Fei Ji
Keyword(s):  
Control System ◽  
Attitude Control ◽  
Sliding Mode ◽  
Dynamic Pressure ◽  
Variable Structure Control ◽  
Variable Structure ◽  
Control Technique ◽  
Nonlinear Simulation ◽  
Flight Phase ◽  
Structure Control

In reentry flight phase of reusable launch vehicle (RLV), its aerodynamic characters alter sharply, going with serious uncertainties and nonlinearities. These factors make the reentry attitude control technique be one of key technique for RLV. In this paper, the sliding mode variable structure control technique is used for reentry attitude control. A specific switch function is defined; a specific exponential reaching law and continuous analogy of sign function are chosen to weaken the chattering brought by the variable structure control technique. RLV is equipped with aerosurfaces and reaction control system (RCS), the arithmetic based on dynamic pressure change is presented. Six-freedom nonlinear simulation with great gain and high frequency disturbance proves that the reentry attitude control technique performs very well, and its control accuracy and robustness are brilliant.

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