The paper describes the development of a nonlinear time domain mathematical model for the prediction of the vertical motions of fast ships in head seas. When calculating the motions of fast planing ships in waves the still water reference position of the vessel at speed is shown to be of importance. Forced oscillation tests have been carried out with a segmented model of a fast ship to yield proper calculation of the added mass and damping at these high forward speeds, taking into account the pressure distribution over the length of the vessel due to the forward speed. A computer program based on this mathematical model has been developed capable of calculating heave, pitch and vertical accelerations of fast vessels in irregular head seas. The results are compared with extensive model experiments.


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    Title :

    Non Linear Heave and Pitch Motions of Fast Ships in Irregular Head Seas


    Contributors:

    Publication date :

    1992


    Size :

    20 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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