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Prescribed performance control for morphing aerospace vehicle under mismatched disturbances

  

  • Received:2020-11-26 Revised:2021-03-03 Online:2021-03-09 Published:2021-03-09

Abstract: For a semi-tilt-rotor morphing aerospace vehicle susceptible to mismatched disturbances and constrained by performance constraints, a composite immersion and invariant (I&I) mismatched/matched disturbance observer and finite-time prescribed performance control strategy is proposed. Firstly, a mathematical model with composite disturbances is established for the morphing aerospace vehicle. Then, a composite I&I disturbance observer is designed to estimate and compensate mismatched/matched disturbances by introducing the finite-time dynamic scaling technique and supervision factor. Finally, a novel finite-time performance function is constructed with the dynamic sliding mode surface as the performance constraint object and combined with the barrier Lyapunov function to characterize the steady-state and transient performance of the system. The effectiveness and superiority of the proposed method are verified by theoretical and simulation results.

Key words: morphing aerospace vehicle, mismatched disturbance, immersion and invariance, finite-time dynamic scaling factor, prescribed performance, barrier Lyapunov function

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