Finite-time output tracking control for air-breathing hypersonic vehicles with actuator constraints

This paper designs a finite-time output tracking controller for air-breathing hypersonic vehicles (AHVs) subjected to disturbances and actuator constraints. After proper derivations, the original model is divided into two independent subsystems undergoing mismatched lumped disturbance. A finite-time disturbance observer (FTDO) is employed to estimate the lumped disturbance, while an auxiliary system combined with a command pre-filter is designed to analyze the effect of input saturation caused by the restrained actuators. Based on the FTDO and the auxiliary system, a novel integral sliding surface is constructed and then a chattering-free nonsingular controller is developed to realize finite-time output tracking in spite of mismatched lumped disturbance and input saturation, which is its major merit compared with other existing AHV controllers. A simulation study is carried out to verify the proposed control scheme.

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Immersion and invariance adaptive finite-time control of air-breathing hypersonic vehicles

Proceedings of the Institution of Mechanical Engineers Part G Journal of Aerospace Engineering ◽

10.1177/0954410018785491 ◽

2018 ◽

Vol 233 (7) ◽

pp. 2626-2641 ◽

Cited By ~ 1

Author(s):

Chao Han ◽

Zhen Liu ◽

Jianqiang Yi

Keyword(s):

Control System ◽

Finite Time ◽

Control Method ◽

Sliding Mode ◽

Second Order ◽

Hypersonic Vehicles ◽

Terminal Sliding Mode ◽

Air Breathing ◽

Immersion And Invariance ◽

Time Control

In this paper, a novel adaptive finite-time control of air-breathing hypersonic vehicles is proposed. Based on the immersion and invariance theory, an adaptive finite-time control method for general second-order systems is first derived, using nonsingular terminal sliding mode scheme. Then the method is applied to the control system design of a flexible air-breathing vehicle model, whose dynamics can be decoupled into first-order and second-order subsystems by time-scale separation principle. The main features of this hypersonic vehicle control system lie in the design flexibility of the parameter adaptive laws and the rapid convergence to the equilibrium point. Finally, simulations are conducted, which demonstrate that the control system has the features of fast and accurate tracking to command trajectories and strong robustness to parametric and non-parametric uncertainties.

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Disturbance Observer-Based Adaptive Control of Hypersonic Vehicles with Constrained Actuators

International Journal of Aerospace Engineering ◽

10.1155/2020/8856676 ◽

2020 ◽

Vol 2020 ◽

pp. 1-12

Author(s):

Guan Wang ◽

Li Li ◽

Weihua Li ◽

Huajun Zhou ◽

Changbo Ma ◽

...

Keyword(s):

Disturbance Observer ◽

Input Saturation ◽

Adaptive Controller ◽

Hypersonic Vehicles ◽

Control Allocation ◽

External Disturbances ◽

Nonlinear Disturbance Observer ◽

Aerodynamic Control ◽

Actuator Constraints ◽

Control Surfaces

This study investigates an adaptive controller for the flexible air-breathing hypersonic vehicles (AHVs) subject to external disturbances and actuator constraints. The combination of nonlinear disturbance observer and adaptive mechanism is exploited to design an adaptive controller for each subsystem. For the velocity subsystem, an auxiliary system is employed to handle the scramjet input saturation issue. For the altitude subsystem, the magnitude/rate constraints and the dynamics of aerodynamic control surfaces are addressed by the control allocation module. Simulations show the effectiveness of the proposed control.

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