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Authors
Oyvind N. Smogeli; Asgeir J. Sorensen

Identifier
10.3182/20060329-3-AU-2901.00047

Index Terms
adaption,observers,propulsion control,thrust losses,marine vessels

Abstract
Recently, new control designs and performance monitoring schemes for electrically driven marine propellers have been developed. The new control designs have been shown to increase the thrust capability, reduce mechanical wear and tear, and limit power transients. To achieve optimum performance, these designs rely on knowledge of the friction in the propeller drive system. Since this information not necessarily is available, a nonlinear adaptive observer for estimating the propeller load torque and the coefficient of friction is developed. Experiments are provided to verify the observer performance.

References

[1] Carlton, J. S. (1994). Marine Propellers & Propulsion
    . Butterworth-Heinemann Ltd.
[2] Friedland, B. (1997). A Nonlinear Observer for
    Estimating Parameters in Dynamic Systems.
    Automatica 33(8), 1525-1530.
[3] Hermann, R. and A. J. Krener (1977). Nonlinear
    controllability and observability. IEEE Trans.
    on Automatic Control 22(5), 728-740.
[4] Panteley, E., A. Loria and A. Sokolov (1999).
    Global Uniform Asymptotic Stability of Non-linear
     Nonautonomous Systems: Application
    to a Turbo-Diesel Engine. European Journal
    of Control 5, 107-115.
[5] Smogeli, Ø. N., A. J. Sørensen and T. I. Fossen
    (2004a). Design of a Hybrid Power/Torque
    Thruster Controller with Thrust Loss Estimation.
     In: Proc. IFAC Conference on
    Control Applications in Marine Systems
    (CAMS'04). Ancona, Italy.
[6] Smogeli, Ø. N., E. Ruth and A. J. Sørensen
    (2005). Experimental Validation of Power and
    Torque Thruster Control. In: Proc. Mediterranean
     Conference on Control and Automation
     (MED'05). Limassol, Cyprus.
[7] Smogeli, Ø. N., J. Hansen, A. J. Sørensen and
    T. A. Johansen (2004b). Anti-Spin Control
    for Marine Propulsion Systems. In: Proc. 43rd
    IEEE Conference on Decision and Control
    (CDC'04). Paradise Island, Bahamas.
[8] Sørensen, A. J., A. K. Ådnanes, T. I. Fossen
    and J. P. Strand (1997). A New Method
    of Thruster Control in Positioning of Ships
    based on Power Control. In: Proc. 4th IFAC
    Conference on Manoeuvring and Control of
    Marine Craft (MCMC'97). Brijuni, Croatia.