In an attempt to contribute to efforts for a robust and effective numerical tool addressing ship motion in astern seas, this paper presents the development of a coupled non-linear 6-DOF model with frequency dependent coefficients, incorporating memory effects and random waves. A new axes system that allows straightforward combination between seakeeping and manoeuvring, whilst accounting for extreme motions, is proposed. Validation of the numerical model with the results of benchmark tests commissioned by ITTC's Specialist Group on Stability demonstrated qualitative, yet not fully satisfactory agreement between numerical and experimental results in line with other predictive tools. The numerical results indicate that the inclusion of frequency coefficients definitely affects the accuracy of the predictions. In order to enhance further the numerical model and obtain useful information on motion coupling, extensive captive and free running model tests were carried out. Good agreement with the experimental results was achieved. These studies provide convincing evidence of the capability of the developed numerical model to predict the dangerous conditions that a ship could encounter in extreme astern seas. As a result, it could offer new insights towards establishing relationships linking ship behaviour to design, environmental and operational parameters.


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    Titel :

    Manoeuvring behaviour of ships in extreme astern seas


    Weitere Titelangaben:

    Manövrierverhalten von Schiffen bei extremen Seegang von hinten


    Beteiligte:
    Ayaz, Zafer (Autor:in) / Vassalos, Dracos (Autor:in) / Spyrou, Kostas J. (Autor:in)

    Erschienen in:

    Ocean Engineering ; 33 , 17-18 ; 2381-2434


    Erscheinungsdatum :

    2006


    Format / Umfang :

    54 Seiten, 46 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




    Behaviour of Ships in Severe Astern Seas

    Tsangaris, M. / Vassalos, D. / Royal Institution of Naval Architects et al. | British Library Conference Proceedings | 1997



    Astern power of ships

    Engineering Index Backfile | 1944


    Manoeuvring of ships

    Bottomley, G.H. | Engineering Index Backfile | 1933


    Manoeuvring of ships

    Bottomley, G.H. | Engineering Index Backfile | 1933