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. 2020 Feb 5;20(3):848.
doi: 10.3390/s20030848.

Variable-Structure Near-Space Vehicles with Time-Varying State Constraints Attitude Control Based on Switched Nonlinear System

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Variable-Structure Near-Space Vehicles with Time-Varying State Constraints Attitude Control Based on Switched Nonlinear System

Cong Feng et al. Sensors (Basel). .

Abstract

This study is concerned with the attitude control problem of variable-structure near-space vehicles (VSNSVs) with time-varying state constraints based on switched nonlinear system. The full states of vehicles are constrained in the bounded sets with asymmetric time-varying boundaries. Firstly, considering modeling uncertainties and external disturbances, an extended state observer (ESO), including two distinct linear regions, is proposed with the advantage of avoiding the peaking value problem. The disturbance observer is utilized to estimate the total disturbances of the attitude angle and angular rate subsystems, which are described in switched nonlinear systems. Then, based on the estimation values, the asymmetric time-varying barrier Lyapunov function (BLF) is employed to construct the active disturbance rejection controller, which can ensure the full state constraints are not violated. Furthermore, to resolve the 'explosion of complexity' problem in backstepping control, a modified dynamic surface control is proposed. Rigorous stability analysis is given to prove that all signals of the closed-loop system are bounded. Numerical simulations are carried out to demonstrate the effectiveness of the proposed control scheme.

Keywords: active disturbance rejection control; dynamic surface control; switched nonlinear system; time-varying state constraints; variable structure near space vehicle.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
VSNSV aerodynamic model.
Figure 2
Figure 2
Comparison curves of the angle of attack α tracking performance.
Figure 3
Figure 3
Comparison curves of the sideslip β tracking performance.
Figure 4
Figure 4
Comparison curves of the bank angle μ tracking performance.
Figure 5
Figure 5
Comparison curves of the roll rate p.
Figure 6
Figure 6
Comparison curves of the pitch rate q.
Figure 7
Figure 7
Comparison curves of the yaw rate r.
Figure 8
Figure 8
Comparison curves of the left elevon.
Figure 9
Figure 9
Comparison curves of the right elevon.
Figure 10
Figure 10
Comparison curves of the rudder.
Figure 11
Figure 11
Estimation error of total disturbances d˜a.
Figure 12
Figure 12
Estimation error of total disturbances d˜v.

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