Analysis on the calculating method of rolling period for dead ship stability

MA Kun; MEI Shumeng; YU Jinzhao

doi:10.19693/j.issn.1673-3185.01574

Volume 15 Issue 3

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Chinese Journal of Ship Research > 2020 > 15(3): 32-37. > DOI: 10.19693/j.issn.1673-3185.01574 CSTR: 32390.14.j.issn.1673-3185.01574

MA Kun, MEI Shumeng, YU Jinzhao. Analysis on the calculating method of rolling period for dead ship stability[J]. Chinese Journal of Ship Research, 2020, 15(3): 32-37. DOI: 10.19693/j.issn.1673-3185.01574

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Analysis on the calculating method of rolling period for dead ship stability

School of Naval Architecture Engineering, Dalian University of Technology, Dalian 116024, China

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Received Date: April 15, 2019
Revised Date: June 24, 2019
Available Online: May 07, 2021

This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 International License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Abstract

Objectives The formulation of the second generation intact stability criterion by IMO is in the stage of continuous improvement. As the first and second level vulnerability assessment methods of dead ship stability are based on different principles, the inconsistency of evaluation results is obvious, so that the accuracy of the assessment methods needs to be further discussed and analyzed.
Methods Rolling period is the main factor affecting the evaluation results. Firstly, based on the differential equation of ship motion, the problems using the existing rolling period calculation method to evaluate were analyzed and discussed; secondly, the calculation method of rolling period in SDC 5/6/8 was applied to the first level vulnerability criteria of dead ship stability, the corresponding program was written as well; 24 sample ships including 72 loading conditions were selected to compare and analyze the calculation results by using the existing and modified method.
Results The results show that, for the ships with obvious non-linear characteristics, more accurate results can be obtained by using the rolling period calculation method to evaluate the vulnerability.
Conclusions It is suggested to evaluate the weakness and formulate the subsequent operation limitation with the calculation method of non-linearity-based rolling period.
- second generation intact stability criteria,
- dead ship stability,
- rolling period,
- calculation method

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