The evaluation of hydrodynamic response for variety of hull configurations has to be obtained during initial design for concept screening studies. A number of response evaluation techniques including finite element, boundary element and panel methods have been in use for some time. These techniques may employ first- or second-order solutions but may take considerable effort and time. The geometric parameters used in the industry for spar hulls indicate that the structures fall within the Morison regime (D/L < 0.2, where D is the diameter of the spar and L is the wave length). A simplified solution technique, which may offer quicker solution with certain approximations, may be acceptable during initial design process. Such an approximate solution has been applied to other floating body problems in the past. Application of semi-empirical methods such as Morison equation for slender structures has been very successful due to its simplicity and ease with which the wave-induced loads are computed. A simplified solution process together with heave damping plate in the form circular disc attached to the keel of the spar has been proposed in this study. The computation of added mass due to the presence of damping plate has been carried out using simple geometric proposition and is verified by experimental studies. The computation of response of rigid floating body can be obtained by the solution to the equation of motion involving six degrees of freedom. The simplified solution uses the force calculated using Morison equation and damping, added mass coefficients obtained from the experiments to calculate the linear responses. Experimental studies were conducted in a laboratory wave flume on spar models to obtain the hydrodynamic damping, added mass and motion response characteristics. The computed responses in terms of response amplitude operators have been compared with that obtained from WAMIT and experimental results.


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    Title :

    Hydrodynamic response of spar hulls with heave damping plate using simplified approach


    Contributors:

    Published in:

    Publication date :

    2014-07-04


    Size :

    15 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English