ObjectiveIn order to improve the calculation accuracy of the influence of slamming load on ship fatigue damage, and evaluate ship fatigue life more effectively, a direct calculation method of ship fatigue damage which accounts for slamming load is proposed. MethodsFirst, the time domain calculation of nonlinear load is combined with the spectral analysis method of linear frequency domain, and the stress time history of the ship in a short-term sea state is obtained based on beam theory. Second, the damage of the check points is calculated using the rain flow counting method and S-N curve, the contribution and influence coefficients of nonlinear slamming load on fatigue damage are calculated with reference to the CCS guidelines, and the corresponding stress response transfer function is corrected by combining the spectral analysis method. Finally, the stress spectrum is calculated and fatigue damage accounting for nonlinear slamming is obtained. ResultsThe results show that compared with traditional spectral analysis method, it is found that the ship fatigue damage obtained by the direct calculation method accounting for slamming load is about 10%–50%. ConclusionThe proposed method can improve the accuracy of load calculation when evaluating the fatigue strength of ships sailing in harsh sea states.


    Access

    Download


    Export, share and cite



    Title :

    Analysis of the direct calculation method of ship fatigue damage considering slamming load


    Contributors:
    Weijun XU (author) / Zhen HUA (author) / Huilong REN (author) / Chenfeng LI (author) / Woda LI (author)


    Publication date :

    2022




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    Unknown




    Hydrodynamics of ship slamming

    Chu, W.H. / Abrahamson, H.N. / Falconer, D.R. et al. | Engineering Index Backfile | 1963


    Ship slamming in head seas

    Szebehely, V.G. / Todd, M.A. | Engineering Index Backfile | 1955


    Ship Slamming in Head Seas

    V. G. Szebehely / M. A. Todd | NTIS | 1955


    Structural damage analysis of a fast ship due to bow flare slamming

    Yamamoto, Y. / Iida, K. | Tema Archive | 1985


    Structural damage analysis of a fast ship due to bow flare slamming

    Yamamoto, Y. / Iida, K. / Fukasawa, T. et al. | IOS Press | 1985