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Prediction of extreme loads on ultra-large containerships with structural hydroelasticity

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Abstract

Design rules for very large seagoing vessels are undergoing changes owing to the hydroelasticity of the ship. The hydroelasticity of the ship is in the form of wave-induced vibrations such as springing and whipping, which are known to aggravate fatigue and extreme loads. The present study deals with a method for the estimation of extreme loads. The method consists of a preliminary analysis of linear responses of motions and loads, and a sequential analysis of the nonlinear extreme load. First, a full-time series of the linear response is obtained using response amplitude operators and wave spectra. Next, the candidate waves of extreme event are extracted from the full-time series based on the linear response. The linear response may be a motion or a load depending on the target value of the sequential analysis. Finally, the sequential analysis is conducted using a fully coupled model of the three-dimensional Rankine panel method, three-dimensional finite-element method, and two-dimensional generalized Wagner model with the candidate waves. The method is validated for a nonlinear hogging moment in a short-term sea state and applied for a long-term prediction of an extreme hogging moment on an ultra-large containership. The extreme values of linear and nonlinear loads are compared in terms of the most probable value and probabilistic distribution.

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Acknowledgements

This study was carried out as part of a research project supported by LRFC [LRFC: Lloyd’s Register Foundation (LRF)-funded Research Center at SNU]. The support provided by LRFC is appreciated. In addition, the administrative supports of AMEC and RIMSE must be credited.

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Authors and Affiliations

  1. Department of Naval Architecture & Ocean Engineering, Seoul National University, 1, Gwanda-ro, Gwanak-gu, Seoul, 151-744, Korea

    Jung-Hyun Kim & Yonghwan Kim

  2. Ship and Offshore ICT Research, Samsung Heavy Industries, Daejeon, Korea

    Jung-Hyun Kim

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  1. Jung-Hyun Kim
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  2. Yonghwan Kim
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Correspondence to Yonghwan Kim.

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Kim, JH., Kim, Y. Prediction of extreme loads on ultra-large containerships with structural hydroelasticity. J Mar Sci Technol 23, 253–266 (2018). https://doi.org/10.1007/s00773-017-0471-9

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  • DOI: https://doi.org/10.1007/s00773-017-0471-9

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