Super twisting sliding mode control for a flexible air-breathing hypersonic vehicle based on disturbance observer

A robust finite time slidingmode control strategy is proposed in this paper for a flexible air-breathinghypersonic vehicle (FAHV) model with aerodynamic parameter uncertainty. The strong coupling among theaerodynamics, the propulsion system and the flexibility effects makes the problem more challenging. Firstly, toreduce the complexity of the controller design, the FAHV model is transformed into three subsystems (velocitysubsystem, altitude and flight path angle subsystem, attack of angle and pitch rate subsystem). Secondly, basedon super-twisting algorithm, a novel finite time disturbance observer and an improved sliding mode controller aredesigned to ensure the finite time stability of each subsystem. The proposed disturbance observer can estimatethe uncertainty and the derivative of virtual control in finite time. Finally, simulation results are presentedto show the precision and rapidness in tracking the reference trajectory and validate the effectiveness of thedesigned controller.

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