The best way of reducing roll motion is by increasing roll damping. Bilge keels are the most common devices for increasing roll damping. If more control is required, anti-roll tanks and fins are used. Tanks have the advantage of being able to function when the ship ist not underway. Our objective is to develop design procedures for passive tanks for roll reduction in rough seas. This paper focusses on the design of passive U-tube tanks. The tank-liquid equation of motion is integrated simultaneously with the six-degree-of-freedom (6DOF) equations of the ship motion. The coupled set of equations is solved by using the Large Amplitude Motion Program 'Lamp', which is a three-dimensional time-domain simulation of the motion of ships in waves. The unstabilized roll motions of a S60-70 ship with forward speed and beam waves have been analyzed. For high-amplitude waves, the unstabilized roll angle exhibits typical nonlinear phenomena: a shift in the resonance frequency, multi-valued responses, and jumps. The performance of a S60-70 ship with a passive tank is investigated in various sea states with different encounter wave direction. It is found that passive anti-roll tanks tuned in linear or nonlinear ranges are very effective in reducing the roll motion in the nonlinear range. The effect of the tank damping, frequency, and mass of the tanks performance is studied. Also, it is found that passive anti-roll tanks are very effective in reducing the roll motion for ships having a pitch freqency that is nearly twice the roll frequency in sea states 5 and 6.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Design of passive anti-roll tanks for roll stabilization in the nonlinear range


    Weitere Titelangaben:

    Der Entwurf von passiven Rolldämpfungstanks für die Stabilisierung der Rollbewegung im nichtlinearen Bereich


    Beteiligte:
    Youssef, K.S. (Autor:in) / Ragab, S.A. (Autor:in) / Nayfeh, A.H. (Autor:in) / Mook, D.T. (Autor:in)

    Erschienen in:

    Ocean Engineering ; 29 , 2 ; 177-192


    Erscheinungsdatum :

    2002


    Format / Umfang :

    16 Seiten, 15 Bilder, 19 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




    Roll stabilization by anti-roll passive tanks

    Abdel Hawad, A.F. / Ragab, S.A. / Nayfeh, A.H. et al. | Tema Archiv | 2001


    Control of ship roll using passive and active anti-roll tanks

    Marzouk, Osama A. / Nayfeh, Ali H. | Tema Archiv | 2009



    A nonlinear model of parametric rolling stabilization by anti-roll tanks

    Neves, Marcelo A.S. / Merino, Jorge A. / Rodriguez, Claudio A. | Tema Archiv | 2009


    Roll reduction of ships using anti-roll n-tanks

    Moaleji, R. / Greig, A. / Institute of Marine Engineering, Science and Technology | British Library Conference Proceedings | 2006