Systems Engineering and Electronics ›› 2023, Vol. 45 ›› Issue (8): 2570-2577.doi: 10.12305/j.issn.1001-506X.2023.08.32

• Guidance, Navigation and Control • Previous Articles     Next Articles

Predefined-time adaptive control for heavy-lift launch vehicles

Yushi JIANG1,*, Yang CHEN1, Lu GAO1, Ligen CAI1, Jixing LYU2   

  1. 1. Beijing Institute of Space Long March Vehicle, Beijing 100076, China
    2. School of Astronautics, Harbin Institute of Technology, Harbin 150006, China
  • Received:2022-04-06 Online:2023-07-25 Published:2023-08-03
  • Contact: Yushi JIANG

Abstract:

In view of the attitude control problem of the heavy-lift launch vehicle with model uncertainty and unknown external interference, a novel predefined-time adaptive control method is proposed, which makes the convergence time of attitude control errors is independent of any system initial condition and can be preset. Firstly, a novel predefined-time sliding mode surface is designed, and the sliding mode surface switching method is used to avoid the singularity. Secondly, a predefined-time sliding mode controller is designed. The lumped disturbance of the system is estimated by neural network and compensated in the controller, and the adaptive law is designed to adaptively adjust the weight coefficient of neural network. The predefined-time stability of the designed controller is proved based on Lyapunov stability theorem. Finally, the feasibility and effectiveness of the proposed method is verified by numerical simulations.

Key words: heavy-lift launch vehicle, predefined-time sliding mode surface, predefined-time sliding mode control, neural network, adaptive law

CLC Number: 

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