A method has been developed to rapidly assess the effects of active fins on the vertical motions (platforming and contouring modes) and/or the roll motion of a SWATH ship in waves. The method combines Linear Quadratic Theory (LQT) of optimal control for obtaining the fin control law with the SWATH Seakeeping Evaluation Program (SSEP). The nonlinearities produced by the fin angle and fin rate saturation are approximated by placing limiting values on their corresponding values in a seaway. This permits frequency domain computations of the stabilized motions which is more consistent with LQT and more cost effective than those computed in the time domain. A description of the procedure and sample results are provided.


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    Swath ships

    Gore,J.L. / US Navy Engng.Experiment Station,Annapolis,US | Kraftfahrwesen | 1985


    Manoeuvring of Swath Ships

    W. C. E. Nethercote / M. D. Miles / W. D. Molyneux | NTIS | 1983


    Extended performance SWATH ships

    Murthy, T.K.S. | Tema Archiv | 1982


    Swath Ships for Offshore Protection

    Holcomb, R. S. / Blyth, A. G. / Royal Institution of Naval Architects | British Library Conference Proceedings | 1995