On the calculation of the righting lever curve for a damaged ship

Pekka Ruponen, Teemu Manderbacka, Daniel Lindroth

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)

Abstract

The current damage stability criteria for ships are mainly based on the characteristics of the righting lever curve. The related calculations for different intermediate stages during the flooding process, and for the final equilibrium condition, are generally considered trivial. However, with the increased computing capacity the regulations are developing towards a more realistic assessment of the intermediate stages of flooding. Most notably, time-domain flooding simulation has become a viable option. Consequently, the practices and assumptions related to the calculation of the righting lever curve for a damaged ship need to be addressed. This paper presents these challenges from different perspectives, and reviews available numerical methods for assessment of damage stability. Sample calculation results with different methods are presented for various damage scenarios, and the results are thoroughly analyzed and discussed. Finally, some recommendations on using the different methods are given.

Original languageEnglish
Pages (from-to)313-324
Number of pages12
JournalOcean Engineering
Volume149
DOIs
Publication statusPublished - 1 Feb 2018
MoE publication typeA1 Journal article-refereed

Keywords

  • Added weight
  • Damage stability
  • Lost buoyancy
  • Progressive flooding
  • Simulation
  • Time-dependency

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