There are two objectives to this paper. First, a chattering-free sliding-mode controller is proposed for the trajectory control of ROVs (remotely operated vehicles). Second, a new approach for thrust allocation is proposed that is based on minimizing the largest individual component of the thrust manifold. With regards to the former, a new adaptive term is developed that eliminates the high-frequency control action inherent in a conventional sliding-mode controller. As opposed to the common adaptive approach, the new adaptive term does not require the linearity condition on the dynamic parameters and the creation of a regressor matrix. In addition, it removes the need for a priori knowledge of upper bounds on uncertainties in the dynamic parameters of the ROV. With regards to the latter, it is demonstrated that minimizing the lINFINITY norm (infinity-norm) of the thrust manifold ensures low individual thruster forces. The new control and thrust allocation concepts are implemented in numerical simulations of a work class ROV, and the chattering-free nature of the controller is demonstrated during typical ROV manoeuvres. In the simulation studies, the lINFINITY norm-based thrust allocation problem is cast as a linear programming problem that allows direct incorporation of the thruster saturation limits and a fault-tolerant property. To achieve real-time solution rates for the lINFINITY norm-based thrust allocation problem, a recurrent neural network is designed. In the simulation studies, the lINFINITY norm-based thrust allocation provides smaller maximum absolute value of the largest component of the thrust manifold than that of a conventional l2 norm (2-norm) minimization, satisfies the saturation limits of each thruster, and accommodates faults that are introduced arbitrarily during the manoeuvre.


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    Title :

    A chattering-free sliding-mode controller for underwater vehicles with fault-tolerant infinity-norm thrust allocation


    Additional title:

    Eine vibrationsfreie Bewegungssteuerung für Unterwasserfahrzeuge mit fehlertoleranter und uneingeschränkter Normschubzuweisung.


    Contributors:

    Published in:

    Ocean Engineering ; 35 , 16 ; 1647-1659


    Publication date :

    2008


    Size :

    13 Seiten, 38 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English






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