This paper develops state- and output-feedback controllers that force an underactuated surface ship to follow a predefined path at a constant forward speed controlled by the main thruster system under the presence of environmental disturbances induced by wave, wind and ocean-current. The proposed controllers are designed using Lyapunov's direct method and the popular backstepping. The unmeasured sway and yaw velocities are estimated by introducing a new nonlinear passive observer. A stability result for nonlinear cascade systems with nonvanishing uncertainties is introduced to analyze closed-loop stability. Numerical simulations using the real data of a monohull ship are provided to illustrate the effectiveness of the proposed methodology for path following of underactuated ships.


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    Titel :

    State- and output-feedback robust path-following controllers for underactuated ships using Serret-Frenet frame


    Beteiligte:
    Do, K.D. (Autor:in) / Pan, J. (Autor:in)

    Erschienen in:

    Ocean Engineering ; 31 , 5-6 ; 587-613


    Erscheinungsdatum :

    2004


    Format / Umfang :

    27 Seiten, 29 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




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