Sea states effects on fatigue damage of large ship prone to springing effect

HUA Kang1 ZHAO Wenbin1 WU Dingfan1

(1.Shanghai Merchant Ship Design and Research Institute, Shanghai 201203)

【Abstract】[Objectives] This paper aims to study the fatigue damage problem of large ships prone to the springing effect. [Methods] The tested fatigue damage of two-generation 400 000 DWT very large ore carriers (VLOCs) is compared by the ship model test method, and the relationships of sea states and fatigue under the springing of hull girders are analyzed. According to the recursion method, a classical sea state is selected from a series of model test sea states. [Results] The results show that the fatigue damage magnification effect has trend relationships with significant wave height and encounter period. The concept of “dominant sea state” is proposed by the inductive recursion method, and the formula of the fatigue damage magnification factor is improved. The springing effect varies significantly according to different sea states, and the fatigue damage magnification effect of wave-induced loads increases very rapidly as significant wave height and encounter period decrease. [Conclusions] Replacing multiple typical sea states with a dominant sea state could allow a relatively accurate fatigue damage magnification factor to be ascertained rapidly. As such, this paper can provide references during the initial design period.

【Keywords】 ship structure; springing; fatigue; ship model test;


【Funds】 High-tech Ship Research Program of the Ministry of Industry and Information Technology ([2017]614)

Download this article

(Translated by HAN R)


    [1] Lloyd’s Register. Structural design assessment: Guidance notes on the assessment of global design loads of large container ships and other ships prone to whipping and springing [S]. London: Lloyd’s Register, 2014.

    [2] CLEARY W A, ROBERTSON J B, YAGLER A. The results and significance of the strength studies on the Great Lake bulk ore carrier Edvard L. Ryerson [C]//SNAME Symposium on Hull stresses in Bulk Carriers. Ottawa: [S. n.], 1971: 412–426.

    [3] LEWIS E. Ship model tests to determine bending moments in waves [J]. The Soc. of Naval Arch. and Marine, 1954: 62.

    [4] DUDSON E, RAMBECH H, WU M. Determination of wave bending loads on a 40 knot, long slender open topped containership through model tests and hydrodynamic calculations with particular reference to the effects of hull flexibility on fatigue life [C]//The 6th International Conference on FAST Sea Transportation. London: The Royal Institution of Naval Architects, 2001: 177–190.

    [5] STORHAUG G, VIDIC-PERUNOVIC J, RÜDINGER F, et al. Springing/whipping response of a large ocean going vessel–a comparison between numerical simulations and full-scale measurements [C]//Proceedings of Hydroelasticity in Marine Technology. Oxford: the University of Oxford, 2003: 117–131.

    [6] MOE E, HOLTSMARK G, STORHAUG G. Full scale measurements of the wave induced hull girder vibrations of an ore carrier trading in the North Atlantic [C]//RINA International Conference, Design and Operation of Bulk Carriers. London: [S. n.], 2005: 57–85.

    [7] WANG X L, GU X K, HU J J. Comparative study of the effect of hull-girder stiffness on springing behaviors[J]. Chinese Journal of Ship Research, 2016, 11 (5): 55–62, 77 (in Chinese).

    [8] Norwegian Marine Technology Research Institute (Marintek). Evaluation of fatigue damage rates based on model tests for the 400, 000DWT ore carrier [R]. Norge: Marintek, 2010.

    [9] JENSEN J J, DOGLIANI M. Wave-induced ship full vibrations in stochastic seaways [J]. Marine Structures,1996, 9 (3/4): 353–387.

    [10] STORHAUG G. Experimental investigation of wave induced vibrations and their effect on the fatigue loading of ships [D]. Norway: Norwegian University of Science and Technology, 2007.

    [11] Shanghai Merchant Ship Design and Research Institute (SDARI). Evaluation of fatigue damage rates based on model tests for the 325, 000DWT ore carrier [R]. Shanghai: SDARI, 2017.

    [12] DNV GL. Fatigue assessment of ship structures: DNV GL-CG-0129 [S]. [S. l]: DNV GL, 2014.

This Article



Vol , No. 06, Pages 176-182

September 2021


Article Outline


  • 0 Introduction
  • 1 Ship model test
  • 2 Analysis of test results
  • 3 Conclusions
  • References