Dynamic Sliding Mode Autopilot for Nonlinear Non-Minimum Phase Flight Vehicle

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  • BAHRAMI Mohsen
    Department of Mechanical Engineering, Amirkabir University of Technology Aerospace Research Institute
  • EBRAHIMI Behrouz
    Department of Mechanical Engineering, Amirkabir University of Technology Aerospace Research Institute
  • ROSHANIAN Jafar
    Aerospace Research Institute Department of Aerospace Engineering, KNT University of Technology

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Design and synthesis of a nonlinear non-minimum phase supersonic flight vehicle longitudinal dynamics control for g commands output tracking are presented. The non-minimum nature of the resulting input/output pair necessitates using a modified switching manifold in sliding mode control theory. The dynamic sliding manifold is designed to compensate for unstable internal dynamics of the system associated with coupling between the moment generating actuators and aerodynamic forces on the flight vehicle. The method is simple to implement in practical applications and enables the sliding mode control design to exhibit the desired dynamic properties during the entire output-tracking process independent of matched perturbations and accommodates unmatched perturbations. Simulation results are presented to demonstrate the performance, robustness, and stability of the autopilot.

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